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Professor Ahmed Kovacevic

Howden/RAEng Chair in Compressor Technology & Associate Dean, Corporate Partnerships

School of Science & Technology Department of Engineering

Contact details

Address

Professor Ahmed Kovacevic CG25 , Tait Building [C]
City St George's, University of London
Northampton Square
London EC1V 0HB
United Kingdom

Personal links

About

Overview

Professor Kovacevic holds his first degree in Mechanical Engineering from University of Sarajevo (1986) and postgraduate degrees in Mechanical Engineering from University of Tuzla, Bosnia & Herzegovina (MSc 1997) and The City University, London, UK (PhD 2002). Following his appointments as Researcher at University of Sarajevo (1986), Assistant Lecturer (1989) and Lecturer (1992) at the University of Tuzla, he joined City University London (1998) as the Research Fellow in the Centre for Positive Displacement Compressor Technology. He was appointed as Senior Lecturer in Mechanical Design at The City University (2004) and was promoted to Howden Chair in Engineering Design and Compressor Technology in 2008. In 2020 prof Kovacevic has received prestigious Howden / Royal Academy Chair in Compressor Technology from RAEng.

Professor Kovacevic is the director of the Centre for Compressor Technology, constitutive part of the large Thermo-Fluids Research Centre and City, University of London. His research is focused on fundamental and applied issues related to compressor technology including high fidelity modelling, analysis, design and application of twin screw machines. Among many projects with industry he is currently leading the cutting edge research to transform the oil-free compression technology in collaboration with Howden Compressors Ltd, a major UK compressor manufacturer and Royal Academy of Engineering. The main educational interest of Professor Kovacevic is developing design excellence of engineering undergraduate and postgraduate students and linking these with industrial research.

Professor Kovacevic is Fellow of Royal Academy of Engineering, Academician of the Academy of Science and Arts of Bosnia and Herzegovina, Fellow of the Institution of Mechanical Engineers in the UK (IMechE), Fellow of the Royal Society of Arts, Manufactures and Commerce, he is the board member of the Fluid Machinery Group of IMechE, Chair of the Design Education Special Interest Group (DESIG) in the Design Society (DS), Chair of the Organising committee for the International Conference on Compressors and their Systems, Chair of the Organising committee of the Engineering and Product Design Education Conference ( E&PDE ), jointly organised by DS and Institution of Engineering Designers (IED). He is Co-Editor of the renowned Journal of Process Mechanical Engineering.
As a result of all these activities professor Kovacevic authored or co-authored 17 books and chapters, 66 Journal Papers, more than 166 referenced Conference Papers, more than 50 Industrial Reports, he holds rights to several patents in the area of positive displacement machines, and has received 8 awards for best papers published in various journals and conferences including IMechE, ASME and World Geothermal Congress. In 2020 he received James Clayton Prize for contribution to fluid machinery from IMEchE.
He is the initial author of the world renowned software SCORG used by a large number of screw compressor organisations and the Director of PDM Analysis Ltd, spin-out company from City, University of London.

Qualifications

  • Chartered Engineer Mechanical Engineering, Institute of Mechanical Engineers (MechE), United Kingdom, Jan 2005
  • Chartered Engineer, Institution of Mechanical Engineers, United Kingdom, Oct 2004
  • PhD in Mechanical Engineering, City University London, United Kingdom, Sep 1998 – Feb 2002
  • MSc Mechanical Engineering, University of Tuzla, Bosnia and Herzegovina, Sep 1995 – May 1997
  • Dipl Ing in Mechanical Engineering, University of Sarajevo, Bosnia and Herzegovina, Sep 1981 – Feb 1986

Employment

  • Howden / Royal Academy of Engineering Research Chair in Compressor Technology, City, University London, Sep 2020 – present
  • Non-executive Technical Specialist, Megger (United Kingdom), Sep 2019 – present
  • External Examiner, Glasgow Caledonian University, Oct 2017 – Sep 2022
  • External examiner, Strathclyde University, Sep 2013 – Aug 2017
  • Howden Chair in Engineering Design and Compressor Technology, City, University of London, Sep 2008 – Aug 2020
  • Howden Chair in Engineering Design and Compressors Technology, City, University of London, Aug 2008 – Aug 2020
  • R&D Manager, Howden Compressors Ltd, Jun 2008 – present
  • Senior Lecturer in Mechanical Design, City, university of London, Sep 2004 – Aug 2008
  • Senior Lecturer in Engineering Design, City, University of London, Jan 2004 – Jul 2008
  • Postdoctoral Research Fellow, City, University of London, Jan 2002 – Jan 2004
  • Research Fellow, City, University of London, Jun 1998 – Apr 2002
  • Visiting Lecturer, University of Tuzla, Jan 1998 – Jan 2008
  • Lecturer, University of Tuzla, Jan 1992 – May 1998
  • Assistant Lecturer, University of Tuzla, Jan 1989 – Jan 1992
  • Research Assistant, University of Sarajevo, Feb 1986 – Oct 1989

Fellowships

  • Fellow of IMechE (FIMechE), Institution of Mechanical Engineers, Jun 2008 – present
  • Member of Design Society, Design Society, Jun 2008 – present
  • Institution of Mechanical Engineers, May 2006 – present

Memberships of professional organisations

  • Board member, IMechE Fluid Mcchinery Group, Nov 2011 – present
  • Fellow, Institution of Mechanical Engineers (IMechE), Nov 2008 – present
  • Design Society, May 2008 – present
  • Member, Institution of Mechanical Engineers (IMechE), 2005 – present

Awards

  • City University of London (2017) 2017 President’s Award for Teaching and Learning
    Award for teaching Engineering Design at City University of London and in particular EGPR (www.city.ac.uk/egpr) project
  • EPSRC (2017) Fundamental Studies of organic Rankine Cycle Expanders (NextORC)
    The aim of this research is to improve the understanding of ORC expander design and off-design performance through developing, and validating, suitable tools to accurately predict design point scaling and off-design performance of ORC systems. Most notably, this refers to predicting the design and off-design performance of supersonic turbines and two-phase screw expanders. These tools will be validated through suitable experimental tests, and will then be used in steady state, dynamic and techno-economic simulations of different cycle configurations.
  • ImechE Fluid Machinery Group (2016) Donald Julius Groen Prize
    2015 Donald Julius Groen Prize, ImechE Fluid Machinery Group for the paper “Analytical Grid Generation for Accurate Representation of Clearances in CFD for Screw Machines” 9th International Conference on Compressors and their Systems, IOP Conf. Series: Materials Science and Engineering, 90, (2015) 012008 doi:10.1088/1757-899X/90/1/012008
  • IMechE (2012) 2011 IMechE Ludwig Mond Prize
    2011 IMechE Ludwig Mond Prize for the best paper: “Steam as the Working Fluid for Power Recovery from Exhaust Gases by Means of Screw Expanders”, Proceedings of the IMechE, Part E: J. of Process Mechanical Engineering, 2011, 225: 117 DOI: 10.1177/2041300910393429 (with I. K. Smith. N. Stosic and E. Mujic)
  • IMechE (2011) 2011 IMechE Moss Prize
    2011 IMechE Moss Prize for the best paper: “Extending the Role of Computational Fluid Dynamics in Screw Machines”, Proc. IMechE, Part E: J. Process Mechanical Engineering, 2011, 225: 83 DOI: 10.1177/ 0954408910397586 (with E.Mujic, N.Stosic, I.K.Smith)
  • Geothermal Resources Council (2007) 2007 Geothermal Resources Council Best paper
    2007 Geothermal Resources Council Best paper, Hot Springs, USA, for paper " Cost Effective Small Scale ORC Systems for Power Recovery from Low Enthalpy Geothermal Resources " with I.K. Smith and N. Stosic
  • Geothermal Resources Council, California, USA (2004) 2004 Geothermal Resources Council Best paper
    Geothermal Resources Council Best paper, California, USA, for paper "An Improved System for Power Recovery from Higher Enthalpy Liquid Dominated Fields" with I.K. Smith and N. Stosic
  • Process Industries Division of IMechE (2003) 2003 Moss Prize
    The best journal paper, Process Industries Division of IMechE for the paper: “Opportunities for Innovation with Screw Compressors” with N.Stosic and I.K.Smith
  • ImechE Fluid Machinery Group 2004 Donald Julius Groen Prize
    Best Paper award for: "Fluid-solid interaction for extension of range in screw machine applications", with N. Stosic and I.K. Smith

Languages

Bosnian (can read, write, speak, understand spoken and peer review), Croatian (can read, write, speak, understand spoken and peer review), English (can read, write, speak, understand spoken and peer review) and Serbian (can read, write, speak, understand spoken and peer review).

Expertise

Geographic Areas

  • Europe

Teaching

PhD - CFD in Positive Displacement Compressors

City University Lonon, United Kingdom
1998-2002

MSc - Mechanical Engineering

University of Tuzla, Bosnia and Herzegovina
1996 – 1997

Dipl Ing - Mechanical Engineering

University of Sarajevo, Bosnia and Herzegovina
1981-1986

Research

Research Summary

Professor Kovacevic does extensive research in numerical modelling, analysis and design of positive displacement machines with focus on CFD modelling and parametric design of twin screw machines. He is a key person in renowned Centre for Positive Displacement Compressors Technology

Research interests

- Positive Displacement Machines
- Screw Compressors and Expanders
- Application of CFD and CCM to Screw Machines
- Methodology of Engineering design
- Engineering Design Competences
- Research and Development
- New Product Development

Research Centre

The Centre for Positive Displacement Compressors Technology was established in 1995 to enhance positive displacement compressors technology and support industry in developments in this area. With support from leading academics, researchers and technicians with test cells, laboratory and workshop facilities the centre has collaborated with major compressor manufactures from all over the world.

Services offered are: Preliminary project evaluation, Software development, Fault investigation, Thermodynamic and fluid flow studies, Stress analysis, Instrumentation and control, Noise prevention and elimination, Full product design and development, support in R&D etc.

Research students

Brijeshkumar Patel

Attendance: Mar 2019 – Feb 2023, full-time

Thesis title: Leakage flows and conjugate heat transfer in rotary positive displacement machines

Role: 1st Supervisor

Further information: Unsteady thermo-fluid-solid interaction is a common fundamental physical phenomenon in leakage flows among various rotary machines. The effect of unsteadiness and conjugation have not been extensively studied previous and potentially this could lead to inaccurate or misleading engineering design strategies. The aim of this research is to improve performance of positive displacement machines by fully understanding conjugate heat transfer in leakage gaps.

Yang Lu

Attendance: Jan 2018 – Dec 2021, full-time

Thesis title: Numerical and Experimental Study of Screw Machines with Large Helix Angle

Role: 1st Supervisor

Further information: The 3D computational fluid dynamic simulation gives better insight into the flow parameters of screw machines. However, currently it is difficult to generate computational grids required for screw rotors with large helix angles. The aim of this research is to establish a methodology to enable accurate and fast CFD performance analysis of screw machines with large helix angles and other complex geometries like single screw or variable geometry machines.

Nausheen Sultana Mehboob Basha

Attendance: Apr 2017 – present, full-time

Thesis title: Development of Screw Compressor by Improving Oil Injection System

Role: 1st Supervisor

Further information: This research will concentrate on development and implementation of a computational model for fast and reliable performance prediction of an oil injected screw compressor. This three dimensional flow model will give insight in the distribution of oil in the compressor system, offer an opportunity to optimise the system with the objective to reduce oil charge and enhance heat transfer and oil separation. The model will be validated by the experimental results obtained in the test rig at City, University of London. The validated model will then be used to propose improvements in the oil injection and separation as well as minimisation of an oil system in a screw compressor with the objective to improve performance and reduce cost of the system and its impact on environment.

Suraj Abdan

Attendance: Apr 2017 – present, part-time

Thesis title: Investigation of Electrically Driven Air Screw Compressor Plant

Role: 2nd Supervisor

Further information: The performance of a packaged electrically driven screw compressor depends upon a number of factors. The most important of these are the rotor and casing design, cooling and lubrication and part load control. Each of these has both a positive and a negative influence and the aim of this project is to develop a method to optimise the performance to cost ratio of the whole system, over the entire operating range by optimising all these effects simultaneously.

Mohammad Arjaneh

Attendance: Jan 2013 – Apr 2015, full-time

Thesis title: Experimental investigation of the multiphase flow at the suction of screw compressor for validation of calculation results

Role: 1st Supervisor

Further information: To determine flow characteristic at the inlet of screw compressor by means of modern measuring methods and to integrate obtained results with predicted values in the common calculation suite.

Date of start 01 Dec 2012

David Buckney

Attendance: Sep 2011 – Jul 2017, part-time

Thesis title: DEVELOPMENT OF SCREW COMPRESSORS THROUGH THE OPTIMISATION AND IMPROVEMENT OF ROTOR PROFILES

Role: 1st Supervisor

Further information: The operation of twin rotor screw compressors will be researched with particular focus on the geometry of the rotors. It will advance this technology by considering how alterations made to the rotor profile or the way in which this geometry is defined can be used. This will be achieved by developing novel optimisation procedures, redefining optimisation input parameters from the rotor profile generation algorithm and identifying the optimisation criteria for specific compressor applications.

Date of start 01 May 2010

Sham Rane

Attendance: Sep 2011 – Jun 2015, full-time

Thesis title: Identification and detailed definition of fluid flow characteristics in a working chamber of a multi-rotor screw machines

Role: 1st Supervisor

Further information: High pressures in screw machines coul dbe achieved by increasing the number of the rotors. Such techniques are not implemented, mainly due to inability to accurately analyse processes in a complex domain shapes of such machines. This research projects will develop knowledge and tools required for calculating such machines which will increase business opportunities of the University through the Compressor Centre by means of patents, new contract and possible spin offs.

Date of start 01 Oct 2012

Ekaterina Chukanova

Thesis title: Simulation and optimization of Screw Compressors operating at unstable conditions

Further information: The aim of this research is to understand how various instabilities affect compressor performance and to develop appropriate modeling methods which will enable improvement of performances and reliability of screw compressor during transient operations.

Date of start 01 Nov 2011

Madhulika Kethidi

Thesis title: Modelling and verification of Turbulent Flows in Screw Compressors

Further information: The aim of this research project is to investigate, develop and validate suitable turbulent models to improve the accuracy of existing Computational Fluid Dynamics (CFD) calculation method for screw compressors. Apart of improvement in accuracy, this research may lead to improvements in following aspects of analysis of internal flows.

Date of start 01 Oct 2009

Elvedin Mujic

Thesis title: A Numerical and Experimental Investigation of Pulsation Induced Noise in Screw Compressors

Further information: Intermittent gas flows of a screw compressor generate pressure oscillations in the suction and discharge systems. These are the main source of structural vibration and noise within the compressor system. Earlier studies did not help in finding a means to reduce these gas pulsations. This thesis describes a detailed analytical and experimental study of the screw compressor process, which was therefore carried out to predict the level of gas pulsations thus generated and how they could be reduced.

Date of start 01 Sep 2005
Date of completion 01 Feb 2009

Publications

Featured publications

  1. Singh, G., Sun, S., Kovacevic, A., Li, Q. and Bruecker, C. (2019). Transient flow analysis in a Roots blower: Experimental and numerical investigations. Mechanical Systems and Signal Processing, 134, pp. 106305–106305. doi:10.1016/j.ymssp.2019.106305.

    [publisher’s website]

Publications by category

Books (6)

  • Smith, I.K., Stosic, N. and Kovacevic, A. (2014). Power Recovery from Low Grade Heat by Means of Screw Expanders.
  • Kovacevic, A., Smith, I. and Stosic, N. (2010). Developments in the modelling positive displacement screw compressor
    Screw Compressors - Computational Fluid Dynamics.     ISBN 978-3-642-07164-5.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (2006). Screw Compressors: Three Dimensional Computational Fluid Dynamics and Solid Fluid Interaction Effects. Berlin: Springer Verlag. ISBN 3-540-36302-5.
  • Stošić, N., Smith, I.K. and Kovačević, A. (2005). Screw compressors. Springer Verlag. ISBN 978-3-540-24275-8.
  • Stošić, N., Smith, I.K. and Kovacevic, A. (2005). Screw compressors. Springer Verlag. ISBN 978-3-540-24275-8.
  • Stosic, N., Kovacevic, A. and Smith, I.K. (2005). Screw Compressors: Mathematical Modeling and Performance Calculation. Berlin: Springer Verlag. ISBN 3-540-24275-9.

Chapters (18)

  • Kovačević, A. (2020). Creativity and Innovation in Educating Engineers and Product Designers of the 21st Century for the Fourth Industrial Revolution. Advances in Business Information Systems and Analytics (pp. 568–586). IGI Global.
  • Barr, S., Gidoomal, R., Roy, R. and Kovačević, A. (2020). Accelerating the Adoption of Industry 4.0 Industrial Digital Technologies in the Manufacturing Business Value Chain. Advances in Business Information Systems and Analytics (pp. 456–466). IGI Global.
  • Kovacevic, A., Rane, S. and Stosic, N. (2019). Modelling of twin-screw machines by use of CFD. Positive Displacement Machines (pp. 423–441). Elsevier. ISBN 978-0-12-816998-8.
  • Stosic, N., Smith, I.K. and Kovacevic, A. (2019). Screw compressors and expanders. Positive Displacement Machines (pp. 115–142). Elsevier. ISBN 978-0-12-816998-8.
  • Husak, E., Kovacevic, A. and Rane, S. (2018). Numerical Analysis of Screw Compressor Rotor and Casing Deformations. Lecture Notes in Networks and Systems (pp. 933–940). Springer International Publishing. ISBN 978-3-319-71320-5.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2014). Introduction: power from low-grade heat. Power Recovery from Low Grade Heat by Means of Screw Expanders (pp. xxvii–xxx). Elsevier. ISBN 978-1-78242-189-4.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2014). Modelling and performance calculation of screw expanders. Power Recovery from Low Grade Heat by Means of Screw Expanders (pp. 93–125). Elsevier. ISBN 978-1-78242-189-4.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2014). Applications for screw expanders. Power Recovery from Low Grade Heat by Means of Screw Expanders (pp. 127–184). Elsevier. ISBN 978-1-78242-189-4.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2014). Power plant thermodynamics. Power Recovery from Low Grade Heat by Means of Screw Expanders (pp. 13–58). Elsevier. ISBN 978-1-78242-189-4.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2014). Geometry and manufacture of screw expander rotors. Power Recovery from Low Grade Heat by Means of Screw Expanders (pp. 59–91). Elsevier. ISBN 978-1-78242-189-4.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2014). Expanders for power recovery. Power Recovery from Low Grade Heat by Means of Screw Expanders (pp. 1–12). Elsevier. ISBN 978-1-78242-189-4.
  • Kovacevic, A., Rane, S. and Stosic, N. (2014). Screw compressor with variable geometry rotors - analysis of designs by CFD. Fluid Machinery Congress 6-7 October 2014 (pp. 91–101). Elsevier. ISBN 978-0-08-100109-7.
  • Chukanova, E., Stosic, N. and Kovacevic, A. (2013). Numerical analysis of unsteady behaviour of a screw compressor plant system. 8th International Conference on Compressors and their Systems (pp. 129–139). Cambridge: Woodhead Publishing. ISBN 978-1-78242-169-6.
  • Buckney, D., Kovacevic, A. and Stosic, N. (2013). Experimental validation of a geometry model for twin screw machines. In City University London, (Ed.), 8th International Conference on Compressors and their Systems (pp. 237–246). Cambridge: Woodhead Publishing. ISBN 978-1-78242-169-6.
  • Pascu, M., Heiyanthuduwage, M., Mounoury, S., Cook, G. and Kovacevic, A. (2013). A study on the influence of the suction arrangement on the performance of twin screw compressors. ASME 2013 International Mechanical Engineering Congress and Exposition ISBN 978-0-7918-5631-4.
  • Kovacevic, A. (2008). Competence development in an international product design course. Proceedings DESIGN 2008, the 10th International Design Conference (pp. 1383–1392). ISBN 978-953-6313-89-1.
  • Kovacevic, A., Stosic, N., Smith, I.K. and Mujic, E. Developments in Modeling Positive Displacements Compressor Machines. Engineering the Future SCYIO.
  • Mujić, E., Kovačević, A., Stošić, N. and Smith, I.K. Noise Control by Suppression of Gas Pulsation in Screw Compressors. Advances in Noise Analysis, Mitigation and Control InTech. ISBN 978-953-51-2674-4.

Conference papers and proceedings (134)

  • Rane, S., Kovačević, A. and Read, M. (2024). Development of Numerical Grid and CFD Model for Analysis of Oil-Injected IGSM. doi:10.1007/978-3-031-42663-6_41
  • Bikramaditya, N., Rane, S., Kovacevic, A. and Patel, B. (2024). CFD Analysis of Leakage Flow in Radial Tip Gap of Roots Blower. doi:10.1007/978-3-031-42663-6_4
  • Patil, S., Abdan, S., Asati, N., Stosic, N. and Kovacevic, A. (2023). Improvement of Screw Compressor Performance by Rotor Profile Modification to Reduce Mechanical Losses. ASME 2023 International Mechanical Engineering Congress and Exposition 29 Oct 2023 – 2 Nov 2023. doi:10.1115/imece2023-112721
  • Patel, H.H., Lakhera, V.J. and Kovacevic, A. (2023). Validation of Leakage Model for an Oil-free Twin-Screw Compressor. 48th National Conference on Fluid Mechanics and Fluid Power (FMFP) 27 Dec 2021 – 29 Dec 2021, Pilani, USA. doi:10.1007/978-981-19-6970-6_49
  • Rane, S. and Kovacevic, A. (2021). 3D CFD modelling of twin screw expanders using real gas equation of state and refprop. 10th IIR Conference on Compressors and Refrigerants 13-15 January, Bratislava, Slovakia. doi:10.18462/iir.compr.2021.0434
  • Kovacevic, A. and Rane, S. (2021). Challenges in 3D CFD Modelling of Rotary Positive Displacement Machines. doi:10.1088/1742-6596/1909/1/012063
  • Sun, S.H., Wu, P.B., Guo, P.C., Yi, G.Z., Kovacevic, A., Zhang, H. … Wu, G.K. (2021). Numerical investigation on a double suction twin-screw multiphase pump. doi:10.1088/1755-1315/774/1/012048
  • Patel, B., Kovacevic, A. and Krupa, A. (2021). On Measuring Velocity and Temperature in Leakage Flows of Oil Free Rotary Positive Displacement Machines. doi:10.1007/978-3-030-75275-0_84
  • Lu, Y., Kovacevic, A., Read, M., Buckney, D. and Endo, Y. (2021). Investigation of Screw Compressors for Low Pressure Ratio Applications. doi:10.1088/1757-899x/1180/1/012006
  • Vimalakanthan, K., Read, M. and Kovacevic, A. (2020). Performance prediction and optimisation of twin-screw expander. doi:10.18462/iir.rankine.2020.1146
  • Kovacevic, A., Rane, S. and Stosic, N. (2019). Modelling of Multiphase Twin Screw Machines. doi:10.1007/978-3-319-90893-9_2
  • Kovacevic, A., Rane, S. and Stosic, N. (2019). Computational fluid dynamics in rotary positive displacement screw machines.
  • Abdan, S., Basha, N., Kovacevic, A., Stosic, N., Birari, A. and Asati, N. (2019). Development and Design of Energy Efficient Oil-Flooded Screw Compressors. doi:10.1088/1757-899x/604/1/012015
  • Husak, E., Kovacevic, A. and Karabegovic, I. (2019). Calculation of clearances in twin screw compressors. doi:10.1088/1757-899x/604/1/012001
  • Stosic, N., Smith, I. and Kovacevic, A. (2019). Improving Screw Compressor Displacement and Efficiency by Increasing the Rotor Profile Depth. doi:10.1088/1757-899x/604/1/011012
  • Abdan, S., Stosic, N., Kovacevic, A., Smith, I. and Asati, N. (2019). Analysis of rolling bearing power loss models for twin screw oil injected compressor. doi:10.1088/1757-899x/604/1/012013
  • Yang, L., Kovacevic, A. and Read, M. (2019). Normal Rack Grid Generation Method for Screw Machines with Large Helix Angles. doi:10.1088/1757-899x/604/1/012011
  • Casari, N., Fadiga, E., Pinelli, M., Suman, A., Kovacevic, A., Rane, S. … Ziviani, D. (2019). Numerical investigation of oil injection in a Roots blower operated as expander. doi:10.1088/1757-899x/604/1/012075
  • Kovacevic, A., Rane, S. and Stosic, N. (2019). Computational fluid dynamics in rotary positive displacement screw machines.
  • Rane, S., Kovačević, A., Stošić, N. and Stupple, G. (2018). On Numerical Investigation of Water Injection to Screw Compressors. ASME 2018 International Mechanical Engineering Congress and Exposition 9-15 November. doi:10.1115/imece2018-86463
  • Sun, S., Kovacevic, A., Bruecker, C., Ghavami, M., Rane, S., Singh, G. … Leto, A. (2018). Experimental Investigation of the Transient Flow in Roots Blower. 24th International Compressor Engineering Conference 9-12 July, Purdue University, Lafayette, IN, USA.
  • Karvountzis-Kontakiotis, A., Singh, G., Kovacevic, A. and Rane, S. (2018). CFD Modelling of a Twin Screw Expander Using a Single Domain Rotor Grid. Gursharanjit Singh 9-12 July, Purdue University, Lafayette, IN, USA.
  • Kovacevic, A., Howell, B., Tarnok, Z., Hazen, G., Jagadeesh, C., Read, M. … Leto, A. (2018). Application of “CODeve” methodology in transatlantic student design project.
  • Kovacevic, A., Vukasinovic, N., Pavkovic, N. and Horak, P. (2017). Evaluation of “Codeve” methodology for teaching npd to virtual design teams.
  • (2017). International Conference on Compressors and their Systems. doi:10.1088/1757-899x/232/1/011001
  • Stosic, N., Rane, S., Kovacevic, A. and Smith, I.K. (2016). Screw Rotor Profiles of Variable Lead Vacuum and Multiphase Machines and Their Calculation Models. ASME 2016 International Mechanical Engineering Congress and Exposition 11-17 November. doi:10.1115/imece2016-66314
  • Rane, , kovacevic, A. and stosic, N. (2016). CFD Analysis of Oil Flooded Twin Screw Compressors. 23rd International Compressor Engineering Conference 11-14 July, Purdue University, USA.
  • Bianchi, G., Rane, , Kovacevic, , Cipollone, R., Murgia, S. and Contaldi, G. (2016). Development of a general numerical methodology for CFD analyses in sliding vane machines and application on a mid-size oil injected air compressor. 23rd International Compressor Engineering Conference 11-14 July, Purdue University USA.
  • Vidovics, B., Vukasinovic, N., Pavkovic, N. and Kovacevic, A. (2016). Development of methodology for distributed collaborative design environment.
  • Vidovics, B., Vukašinovic, N., Pavkovic, N. and Kovačevic, A. (2016). Introduction of methodology for distributed collaborative industry-academia project based learning.
  • Cristoloveanu, A., Basangova, A., Hawchar, K., Mason, C. and Kovacevic, A. (2016). AN INSIGHT INTO THE USE OF PROBLEM-BASED LEARNING WITHIN DISTRIBUTED DESIGN STUDENT PROJECTS.
  • Chukanova, E., Stosic, N. and Kovacevic, A. (2015). Modelling and Experimental Investigation of Compressor Plant Operation Under Unsteady Conditions. ASME 2015 International Mechanical Engineering Congress and Exposition 13-19 November. doi:10.1115/imece2015-50896
  • Read, , Smith, I.K. and Stosic, N. (2015). Comparison of Organic Rankine Cycle Under Varying Conditions Using Turbine and Twin-Screw Expanders. 3rd International Seminar on ORC Power Systems 12-14 October, Brussels, Belgium.
  • Kovacevic, A. (2015). 9th International Conference on Compressors and their Systems. 9th International Conference on Compressors and their Systems 7-9 September, London, UK. doi:10.1088/1757-899X/90/1/011001
  • Mamo, J., Farrugia, P., Borg, J., Wodehouse, A., Grierson, H. and Kovacevic, A. (2015). Using engineering design tools in multidisciplinary distributed student teams.
  • Rane, S., kovacevic, A., Stosic, N., Jiang, Y., Furmanczyk, M. and Lowry, S. (2014). Influence of approaches in CFD Solvers on Performance Prediction in Screw Compressors. 22nd International Compressor Engineering Conference 14-17 July, Purdue University USA.
  • Arjeneh, M., Kovacevic, , Rane, , Stosic, and Gavaises, M. (2014). Study of Multiphase Flow at the Suction of Screw Compressor. 22nd International Compressor Engineering Conference 14-17 July, Purdue University USA.
  • Kovacevic, A., Rane, S. and Stosic, N. (2014). Screw compressor with variable geometry rotors - analysis of designs by CFD. doi:10.1016/B978-0-0810-0109-7.50009-1
  • Frost, K., Linda, S., Kovacevic, A. and Rane, S. (2014). Flyable - Design of fuselage for two seater aircraft to be flown by a disabled pilot: Learning outcomes from different approaches to lectures.
  • Rane, S., Kovacevic, A., Stosic, N. and Kethidi, M. (2013). CFD grid generation and analysis of screw compressor with variable geometry rotors.
  • Kovacevic, A. and Rane, S. (2013). 3D CFD analysis of a twin screw expander.
  • Loumakis, G., Wood, B., Birse, F., Burek, S., Kovacevic, A. and Rane, S. (2013). Case study on a conceptual design of solar thermal collectors using a collaborative framework of engineering design and product design tools.
  • Rane, , Kovacevic, A. and Kethidi, M. (2012). CFD Modeling in Screw Compressors with complex multi rotor configurations. 21st International Compressor Engineering Conference 16-19 July, Purdue University USA.
  • Kethidi, M., Kovacevic, A., Stosic, N. and Rane, S. (2012). Modelling of turbulence in screw compressor flows. THMT-12. Proceedings of the Seventh International Symposium On Turbulence, Heat and Mass Transfer Palermo, Italy, 24-27 September, 2012 13-19 June. doi:10.1615/ichmt.2012.procsevintsympturbheattransfpal.2080
  • Chukanova, E., Stosic, N., Kovacevic, A. and Rane, S. (2012). Identification and quantification of start up process in oil flooded screw compressors. doi:10.1115/IMECE2012-86497
  • Bohemia, E., Blythe, M., Cruickshank, L., Fain, N., Kovacevic, A. and Steane, J. (2012). Exploring new forms of online collaborative design: Workshop discussion paper.
  • Fain, N., Kovacevic, A. and Fairbairn, J. (2012). Technical-commercial interface - A baseline for successful new product development.
  • Stosic, N., Nietcho, J.A. and Kovacevic, A. (2011). The Use of a Unique Tool for Manufacturing Screw Compressor Rotors of Varying Configuration, Centre Distance and Helix Angle. 7th International Conference on Compressors and Their Systems 5-6 September, London, England.
  • Kethidi, M., Kovacevic, A. and Stosic, N. (2011). Evaluation of Various Turbulence Models in Predicting Screw Compressor Flow Processes by CFD. 7th International Conference on Compressors and Their Systems 5-6 September, London, England.
  • Buckney, D., Kovacevic, A. and Stosic, N. (2011). Consideration of Clearances in the Design of Screw Compressor Rotors. 7th International Conference on Compressors and Their Systems 5-6 September, London, England.
  • Stosic, N., Smith, I.K. and Kovacevic, A. (2011). Numerical and experimental research in heat transfer to screw compressor rotors. 13-17 March, Honolulu, Hawaii, USA.
  • Kovacevic, A., Stosic, N., Mujic, E., Smith, I.K. and Guerrato, D. (2011). Extending the role of computational fluid dynamics in screw machines. doi:10.1177/0954408910397586
  • Smith, I.K., Stosic, N., Mujic, E. and Kovacevic, A. (2011). Steam as the working fluid for power recovery from exhaust gases by means of screw expanders. doi:10.1177/2041300910393429
  • Kovacevic, A., Stosic, N., Mujic, E., Smith, I.K. and Guerrato, D. (2011). Extending the role of computational fluid dynamics in screw machines. doi:10.1177/0954408910397586
  • Luckkana, K., Patel, V., Negi, V., Raipancholi, H., Yola, I., Dhunput, A. … Kovacevic, A. (2011). Industrial undergraduate project-remote monitoring for screw compressors.
  • Pavković, N., Marjanović, D., Kovačević, A. and Fain, N. (2011). Industrial partnership in design education - Experiences from EGPR course.
  • Nietcho, J.A., Stosic, N. and Kovacevic, A. (2011). The use of a unique tool for manufacturing screw compressor rotors of varying configuration, centre distance and helix angle. doi:10.1533/9780857095350.7.317
  • Heiyanthuduwage, M.A., Mounoury, S. and Kovacevic, A. (2011). Performance prediction methods for screw compressors. doi:10.1533/9780857095350.8.411
  • Stosic, N., Smith, I.K., Kovacevic, A. and Mujic, E. (2010). Development of Water Lubruicated Compressor Expander for Fuel Cell Application. 12-18 November, Vancouver, British Columbia, Canada.
  • Kovacevic, A., Mujic, E., Smith, I.K., Stosic, N. and Kethidi, M. (2010). Turbulence Capture in CFD for Screw Machines. Conference on Screw Type Machines VDI-Schraubenmachinen October, Dortmund, Germany.
  • Kovacevic, A., Mujic, E., Stosic, N. and Smith, I.K. (2010). Extending the Role of Computational Fluid Dynamics in Screw Machines. 20th International Compressor Engineering Conference at Purdue July.
  • Stosic, N., Kovacevic, A., Smith, I.K. and Mujic, E. (2010). Three Decades of Modern Practice in Screw Compressors. 20th International Compressor Engineering Conference at Purdue July.
  • Kovacevic, A., Mujic, E., Stosic, N. and Smith, I.K. (2010). Advanced Design Environment for Screw Machines. 20th International Compressor Engineering Conference at Purdue July.
  • Stosic, N., Smith, I.K., Kovacevic, A. and Mujic, E. (2010). Research in Water Lubricated Screw Compressors for Fuel Cell Application. FC Expo, Academic Forum March, Tokyo.
  • Ghazihesami, R., Verdeguer, J., Jeshani, S., Halai, A., Gowree, E., Valtera, J. … Kovacevic, A. (2010). Use of a structured engineering design process in expanding markets of SME's.
  • Halai, A., Jeshani, S., Ghazihesami, R., Verdeguer, J., Gowree, E., Valtera, J. … Kovacevic, A. (2010). Challenges in conceptual design of fencing systems, students view.
  • Stosic, N., Smith, I.K. and Kovacevic, A. (2009). Steam as the Working Fluid for Power Recovery from Exhaust Gases by Means of Screw Expanders. International Conference on Compressors and Their Systems 7-9 September, London, England.
  • Stosic, N. and Kovacevic, A. (2009). Relation of Modelling and Measurement in Design of Positive Displacement Machines. Engines and Vehicles Symposium April, Belgrade.
  • Okezue, C., Kovacevic, A., Mujic, E., Stosic, N. and Smith, I.K. (2009). Overview of methods used for the analysis of multiphase flows in positive displacement screw machines.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2009). Steam as the working fluid for power recovery from exhaust gases by means of screw expanders.
  • Mujic, E., Kovacevic, A., Stosic, N. and Smith, I.K. (2009). Numerical modelling of gas pulsations in a screw compressor.
  • Machado, L., Hashi, M., Gowree, E.R., Ondoa, G., Gaind, R. and Kovacevic, A. (2009). Development of a modular screw compressor concept through EGPR course.
  • Delash, T., Leyderman, A.D., Stosic, N., Smith, I.K. and Kovacevic, A. (2009). Rotor retrofit for better screw compressor performance in refrigeration and air conditioning.
  • King, A., Plant, R. and Kovacevic, A. (2009). Improved design of gear pump porting through CFD simulation.
  • Kovacevic, A., Stosic, N., Mujic, E., Smith, I.K. and Guerrato, D. (2009). Extending the role of computational fluid dynamics in screw machines.
  • Machado, L., Hashi, M., Gowree, E.R., Ondoa, G., Gaind, R. and Kovacevic, A. (2009). Undergraduate project on conceptual design of a small screw compressor.
  • Stosic, N., Kovacevic, A., Smith, I.K., Mujic, E. and Guerrato, D. (2008). Advances in Numerical and Experimental Investigation of Screw Compressors. International Conference on Compressor and Refrigeration September, Xian, China.
  • Stosic, N., Kovacevic, A., Smith, I.K., Mujic, E. and Guerrato, D. (2008). Experimental Validation of CFD Calculations in Screw Compressors. IMechE Seminar ‘Computational Fluid Dynamics, how much is enough? September, London.
  • Stosic, N., Smith, I.K., Kovacevic, A. and Mujic, E. (2008). Geometry of Screw Compressor Rotors and Their Tools. International Conference on Compressor and Refrigeration September, Xian, China.
  • Stosic, N., Mujic, E., Kovacevic, A. and Smith, I.K. (2008). Reduction of Noise in Screw Compressors. 12th International Research/Expert Conference ‘Trends in the Development of Machinery and Associated Technology’, TMT 2008 26-30 August, Istanbul, Turkey.
  • Stosic, N., Kovacevic, A., Smith, I.K. and Mujic, E. (2007). An evaluation of encapsulated oil flooded screw compressor systems. Seattle 2007.
  • Stošić, N., Mujić, E., Smith, I.K. and Kovačević, A. (2007). Development of a rotor profile for silent screw compressor operation.
  • Kovačević, A., Mujić, E., Stošić, N. and Smith, I.K. (2007). An integrated model for the performance calculation of screw machines.
  • Mujić, E., Kovačević, A., Stošić, N. and Smith, I.K. (2007). The influence of port shape on gas pulsations in a screw compressor discharge chamber.
  • Stosic, N., Mujic, E., Kovacevic, A. and Smith, I.K. (2007). The Influence of Port Shape on Gas Pulsations in a Screw Compressor Discharge Chamber. International Conference Compressors and Their Systems London, England.
  • Kovacevic, A., Rakocevic, V., Exarchou, K. and Jeshani, M. (2007). Teaching an engineering design course in an interdisciplinary international academic virtual environment.
  • Nouri, J.M., Guerrato D., , Stosic N., and Kovacevic A., (2006). Cycle resolved velocity measurements within a screw compressor. 18th Int. Compressor Eng. Conf. 17-20 July, Purdue.
  • Stosic, N., Wang, Z., Zhang, W., Kovacevic, A., Smith, I.K. and Mujic, E. (2006). New Design and Rotor Retrofit to Improve Capacity and Performance of Refrigeration Screw Compressors. 18th International Compressor Engineering Conference at Purdue July.
  • Stosic, N., Mujic, E., Kovacevic, A. and Smith, I.K. (2006). The Influence of Discharge Ports on Rotor Contact in Screw Compressors. 18th International Compressor Engineering Conference at Purdue July.
  • Kovacevic, A., Stosic, N., Mujic, E. and Smith, I.K. (2006). INFLUENCE OF THERMAL DILATATION UPON DESIGN OF SCREW MACHINES. May, Dubrovnik - Croatia.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (2006). Numerical simulation of combined screw compressor-expander machines for use in high pressure refrigeration systems.
  • Stosic, N., Smith, I.K., Kovacevic, A. and Mujic, E. (2006). Vacuum and multiphase screw pump rotor profiles and their calculation models.
  • Kovacevic, A., Stosic, N., Mujic, E. and Smith, I.K. (2006). Influence of thermal dilatation upon design of screw machines.
  • Alagic, S., Stosic, N., Kovacevic, A. and Buljubasic, I. (2005). A Numerical analysis of heat transfer and fluid flow in rotary regenerative air pre-heaters.
  • Kovacevic, A., Stosic, N., Mujic, E. and Smith, I.K. (2005). Design Integration for Screw Compressors. Bihac, Bosnia and Herzegovina 2005.
  • Kovacevic, A., Stosic, N., Mujic, E. and Smith, I.K. (2005). Analysis of clearances in combined screw machines. doi:10.1115/IMECE2005-79325
  • Kovacevic, A., Stosic, N., Smith, I.K. and Mujic, E. (2005). Clearance management in multifunctional screw machines.
  • Stošić, N., Smith, I.K., Kovačević, A., Kim, J.U. and Park, J. (2005). Improving screw compressor performance.
  • Mujic, E., Kovacevic, A., Stosic, N. and Smith, I.K. (2005). Noise prediction in screw compressors.
  • Stosic, N., Alagic, A., Kovacevic, A. and Buljubasic, I. (2004). A Numerical Analysis of Heat Transfer and Fluid Flow in Rotary Regenerative Air Pre-Heaters,. ASME - ZSITS International Thermal Science Seminar June, Bled, Slovenia.
  • Kovacevic, A., Stosic, N., Smith, I.K. and Mujic, E. (2004). Development of the management interface for screw compressor design tools. 14 April, Lausanne , Switzerland.
  • Kovacevic, A., Stosic, N., Smith, I.K. and Mujic, E. (2004). Fluid-solid interaction in the design of multifunctional screw machines.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2004). An improved system for power recovery from higher enthalpy liquid dominated fields.
  • Stosic, N., Smith, I.K. and Kovacevic, A. (2004). Estimation and control of heat transfer in screw compressor rotors. doi:10.1115/IMECE2004-60516
  • Stosic, N., Smith, I.K. and Kovacevic, A. (2003). Improving refrigeration screw compressor performance with optimized rotors. 8-10 September, London, England.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (2003). The application of CFD analysis to the design of bi-functional screw machines. 8-10 September, London, England.
  • Stosic, N., Smith, I.K. and Kovacevic, A. (2003). Combined screw compressor-expander in fuel cell application.
  • Ionita, I.C., Ion, I.V., Smith, I.K., Stosic, N., Kovacevic, A., Iosifescu, C. … Popa, V. (2003). Cost-to-quality optimization of refrigeration.
  • Stosic, N., Smith, I.K. and Kovačević, A. (2002). Optimization of Screw Compressor Design. VIII European Congress on Fluid Machinery for the Oil, Gas and Petrochemical Industry October.
  • Stosic, N., Alagic S, and Kovacevic A, (2002). A Numerical Analysis of the Fluid Flow and Heat Transfer in Ljungsroem Air Preheater. TMT 2002, Neum, B&H September.
  • Stosic, N., Smith, I.K. and Kovacevic, A. (2003). Optimization of screw compressor design. Jul 2002, Purdue.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (2002). Three-dimensional modelling of solid fluid interaction as a design tool in screw compressors. 14-17 May, Dubrovnik.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (2002). Numerical simulation of fluid flow and solid structure in screw compressors.
  • Kovacevic, A., Stosic, N. and Smith, I. (2002). The influence of rotor deflection upon screw compressor performance.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (2002). Numerical simulation of fluid flow and solid structure in screw compressors. doi:10.1115/IMECE2002-33367
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2002). Optimization of Screw Compressor Design. USA.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2001). A feasibility study of throttle loss power recovery in large heat pumps with two stage compression. September, London, England.
  • McCreath, P., Stosic, N., Smith, I.K. and Kovacevic, A. (2001). The design of efficient screw compressors for delivery of dry air. September, London, England.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (2001). Analysis of screw compressor performance by means of three-dimensional numerical modelling.
  • Madhav, K.V., Stosic, N., Smith, I.K. and Kovacevic, A. (2001). The design of a family of screw compressors for oil-flooded operation.
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2001). Use of screw machines as a throttle valve replacement in refrigeration plants.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (2000). Grid Aspects of Screw Compressor Flow Calculations. ASME 2000 International Mechanical Engineering Congress and Exposition 5-10 November. doi:10.1115/imece2000-1300
  • Smith, I.K., Stosic, N. and Kovacevic, A. (2000). USE OF SCREW MACHINES AS A THROTTLE VALVE REPLACEMENT IN REFRIGERATION PLANTS. Thermal Sciences 2000. Proceedings of the International Thermal Science Seminar Bled 11-14 June. doi:10.1615/ichmt.2000.thersieprocvol2thersieprocvol1.670
  • Stosic, N., Smith, I.K. and Kovacevic, A. (2000). Design of oil-less helical twin screw machines. May, Dubrovnik, Croatia.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (2000). Grid aspects of screw compressor flow calculations.
  • Smith, I.K., Stosic, N., Aldis, C.A. and Kovacevic, A. (1999). Twin screw two-phase expanders in large chiller units. September, London, England.
  • Kovacevic, A., Stosic, N. and Smith, I.K. (1999). Development of CAD-CFD interface for screw compressor design. September, London, England.
  • Stosic, N., Kovacevic, A. and Smith, I.K. (1998). Modelling of screw compressor capacity control. November, London, England.
  • Stosic, N., Smith, I.K. and Kovacevic, A. (1998). Some aspects of tool design for screw compressor rotor manufacturing. May, Dubrovnik, Croatia.
  • STOSIC, N., MILUTINOVIC, L., HANJALIC, K. and KOVACEVIC, A. (1990). EXPERIMENTAL INVESTIGATION OF THE INFLUENCE OF OIL INJECTION UPON THE SCREW COMPRESSOR WORKING PROCESS. West Lafayette, IND, USA.
  • Lu, Y., Kovacevic, A. and Read, M. Numerical study on screw machines with large helix angles.doi:10.1088/1757-899x/425/1/012023
  • Basha, N., Kovacevic, A., Stosic, N. and Smith, I. Effect of oil-injection on twin screw compressor performance.doi:10.1088/1757-899x/425/1/012009
  • Abdan, S., Stosic, N., Kovacevic, A., Smith, I. and Deore, P. Identification and analysis of screw compressor mechanical losses.doi:10.1088/1757-899x/425/1/012015
  • Casari, N., Pinelli, M., Suman, A., Kovacevic, A., Rane, S. and Ziviani, D. Full 3D numerical analysis of a twin screw compressor by employing open-source software.doi:10.1088/1757-899x/425/1/012017

Journal articles (70)

Patents (7)

  • Kovacevic, A. (2012). Screw Machine with Variable Diameter Rotors.
  • Kovacevic, A., Smith, I.K. and Stosic, N. (2012). Expander lubrication in vapour power systems.
  • Kovacevic, A. and udo, N. (2012). Fluid Machine - Bearing Inserts. Patent no. WO 2012/150456 A2
  • Kovacevic, A. (2012). Fluid Machine - Bearing Inserts. Patent no. WO 2012/150456 A2
  • Kovacevic, A., stosic, N. and Smith, I.K. (2006). Expander lubrication in vapour power systems.
  • Kovacevic, A. Compressor INserts.
  • Kovacevic, A., Smith, I.K. and Stosic, N. Controlling vapour power plant.

Software (3)

  • Kovacevic, A. and Stosic, N. (2006). DISCO. London: City University London.
  • Kovacevic, A. (2005). SCORG(c)..
  • kovacevic, A. and Rane, S. (2005). SCORG – the software for design and analysis of Screw Compressors, Pumps and Motors..

Theses/dissertations (2)

Professional activities

Collaborations (academic) (7)

  • of AHRC funded project with Northumbria University on advances in communication technology for Design project (Feb – Aug 2012)
    Other partners: Dr Erik Bohemia, Northumbria University
  • of EGPR with University of Budapest project (Feb 2009 – present)
    Other partners: Prof Karoly Varady
  • of Lond Term comllaboration with University of Tuzla, Bosnia and Herzegovina project (May 2008 – present)
    Other partners: Prof Dzemo Tufekcic, rector
  • of EGPR - with TU Delft project (Feb 2005 – Jun 2010)
    Other partners: Prof IMre Horwath
  • of EGPR - with EPFL Lausanne project (Feb 2005 – Jul 2011)
    Other partners: Prof Paul Xirouchakis, Dr Ian Stroud,
  • of EGPR with University of Ljubljana project (Feb 2005 – present)
    Other partners: Prof Joze Duhovnik, head of Mechanical Engineering
  • of EGPR with University oh Zagreb project (Feb 2005 – present)
    Other partners: Prof Dorian Marjanovic, Chair in Design

Collaborations (industrial) (2)

  • of (Jun 2008 – present)
    Other partners: Jim Fairbairn, David Boughey, Graeme Cook
  • of (2008 – 2010)
    Other partners: Trane - JAck Sauls

Editorial activity (4)

  • Chairman of the 9th International Conference on Compressors and Their Systems, London, September 2015.
  • Chairman of the 15th International Conference on Engineering and Product Design Education to be held in Twente, Netherlands on 4th and 5th September 2014.
  • Associate Editor for Journal of Process Mechanical Engineering.
  • Fellow of IMechE.

Events/conferences (6)

  • 9th International Conference on Compressors and their Systems. Mermaid Conference Centre - Blackfriars, London (2015).
    Description: Chairman of the 9th International Conference on Compressors and Their Systems held from 7-9th September 2015.
    Featuring participation by manufacturers of compressors, expanders and systems and control systems, equipment suppliers, users and research organisations. This conference provided a forum where developments in air, gas and refrigeration compressors, vacuum pumps, expanders, related systems and components can be presented for discussion.

    Conference proceedings have been published online and are now available to view via IOP Conference Series

    More details: http://www.city.ac.uk/compressorsconference/2015-conference
  • 8th International Conference on Compressors and their Systems. City University London (2013).
    Description: mber 2013

    The International Conference on Compressors and their Systems is organized by City University in conjunction with the Institution of Mechanical Engineers, This is biannual meeting of industrial and academic leaders in compressors.
    Ahmed Kovacevic is in the organizing committee
  • 15th International Conference on Engineering and Product Design Education. Dublin Institute of Technology, Dublin, Ireland (2013).
    Description: The 15th International Conference on Engineering and Product Design Education Conference is organised by the School of Manufacturing & Design Engineering, Dublin Institute of Technology (DIT), in participation with the Design Education Special Interest Group (DESIG) of the Design Society and the Institution of Engineering Designers (IED). Ahmed Kovacevic is in the organising committee on behalf of Design Society. The conference will bring together representatives from education, design practice, industry and government agencies that have an interest in developing new approaches and directions in design education.
  • The 13th International Conference on Engineering and Product Design Education. City University London (2011).
    Description: The E&PDE conference bring together representatives from education and industry who have an interest in sharing new perspectives on design education. The conference will provide a forum for educators, practitioners and students from product development, engineering and industrial design, together with industry to discuss current educational issues and the nature of design education now and in the future. This year's conference theme, Design Education for creativity and Business Innovation aims to provide a platform for participants to explore how design education can impact upon and strengthen business innovation.
    Ahmed Kovacevic was local organizer of the conference jointly organised by City University, IED and Design Society
  • 7th International Conference on Compressors and their Systems. City University London (2011).
    Description: mber 2013

    The International Conference on Compressors and their Systems is organized by City University in conjunction with the Institution of Mechanical Engineers, This is biannual meeting of industrial and academic leaders in compressors.
    Ahmed Kovacevic is in the organizing committee
  • 6th International Conference on Compressors and Their Systems. City University London (2009).
    Description: The International Conference on Compressors and their Systems is organized by City University in conjunction with the Institution of Mechanical Engineers, This is biannual meeting of industrial and academic leaders in compressors.
    Ahmed Kovacevic is in the organizing committee

Keynote lectures/speeches (4)

  • Advances in Modelling of Screw Machines. International Conference on Screw Machines Technische Universität Dortmund 18th-19th September 2018 (2018). Twin screw compressors used in refrigeration, gas and air compression represent approximately 80% of the millions of industrial positive displacement compressors produced globally each year. More than 95% of these are oil injected. A derivative of this type of machine operates as an expander to generate power. Screw expanders often operate with phase changing organic fluids and oil injection. Similar machines such as twin screw pumps are commonly used for pumping multiphase fluids containing gas, liquid and solid particles and may be subject to cavitation. Such machines, when operating with multiphase fluids, need to operate both reliably and efficiently.
    Multiphase twin screw machines are traditionally analysed and designed by the use of chamber thermodynamic models. However for their further improvement, it is necessary to use more advanced modelling techniques. One of the options is 3D Computational Fluid Dynamics (CFD). In order to obtain fast and accurate predictions of multiphase screw machine performance, it is necessary to generate numerical grids of the highest quality both quickly and reliably.
    This keynote address will give an introduction to the history and the current state of modelling multiphase twin screw machines such as compressors, expanders and pumps, using CFD and the importance of grid generation on the accuracy and speed of calculation. The presentation will also indicate future challenges and development trends in grid generation and in the use of CFD for modelling screw machines.

    Keywords: Multiphase twin screw machines, Computational Fluid Dynamics, Grid Generation
  • Modelling of Multiphase Twin Screw Machines. 4th International Conference “New Technologies NT-2018“ Sarajevo 2018 (2018). Twin screw compressors used in refrigeration, gas and air compression represent approximately 80% of the millions of industrial positive displacement compressors produced globally each year. More than 95% of these are oil injected. A derivative of the concept operates as an expander to generate power. Screw expanders often use a phase changing organic fluids and oil injection. Twin screw pumps are commonly used for pumping fluids which often contain gas, liquid and solid particles and may be subject to cavitation. Reliability and efficiency of such machines operating with multiphase fluids is of utmost importance for economy and ecology.
    Multiphase twin screw machines are traditionally analysed and designed by use of chamber thermodynamic models for performance calculation. However for further improvement of efficiency and reliability it is necessary to use more advanced modelling techniques such as 3D Computational Fluid Dynamics (CFD). In order to obtain fast and accurate solution of multiphase screw machines, it is important that a numerical grid of the highest quality is generated quickly and reliably. For that purpose, a deforming grid of a twin screw machine is generated using algebraic transfinite interpolation upon which an elliptic partial differential equations (PDE) of the Poisson’s form are solved numerically to produce smooth final computational mesh. The speed of mesh generation and the quality of numerical cells and their distribution allow use of variety of commercial CFD solvers for reliable and fast analysis of multiphase screw machines.
    This keynote address reviews the current state of art in the application of CFD in modelling of multiphase twin screw machines including compressors, expanders and pumps. The presentation will also indicate the future challenges and development trends in application of CFD for multiphase twin screw machines.

    Keywords: Multiphase twin screw machines, Computational Fluid Dynamics, Grid Generation
  • Modelling of Multiphase Twin Screw Machines. 8thInternational Conference on Compressors and Refrigeration, Xi’an, China, 20-22/07/2017 (2017). Twin screw compressors used in refrigeration, gas and air compression represent approximately 80% of the millions of industrial positive displacement compressors produced globally each year. More than 95% of these are oil injected. Oil injected twin screw compressor is just one type of multiphase screw machines. Other include twin screw expanders, multiphase pumps and motors. Multiphase twin screw machines are traditionally analysed and designed by use of chamber thermodynamic models. However for further improvement of efficiency and reliability it is necessary to use more advanced modelling techniques such as 3D Computational Fluid Dynamics (CFD). In order to obtain fast and accurate solution of multiphase screw machines using CFD, it is important that a numerical grid of the highest quality is generated quickly and reliably. For that purpose, a deforming grid of a twin screw machine is generated using algebraic transfinite interpolation upon which an elliptic partial differential equations (PDE) of the Poisson’s form are solved numerically to produce smooth final computational mesh. This is built in the grid generation software SCORGTM which allows fast mesh generation and the quality of numerical mesh for use with variety of commercial CFD solvers. A test oil injected twin screw compressor with rotor configuration 4/5 and 127 mm main rotor diameter was measured in the compressor rig of the Centre for Compressor Technology at City, University of London. The performance prediction obtained using SCORG mesh and commercial CFD solver showed a close match with measured mass flow rates and indicated power. The model provided an exceptional visualization of the interaction of gas and oil inside the compression chamber. The mixing of the phases, distribution of oil, heat transfer between gas and oil and also effects on sealing due to high oil concentration in leakage gaps were well captured.
  • ADVANCES IN MODELLING SCREW MACHINES. Xia'n Jiaotong University, Xia'n China (2015). Positive displacement screw machines are classified as compressors, expanders, extruders, blowers, vacuum pumps, liquid and multiphase pumps. They are commonly used in industrial refrigeration, air conditioning, process gas compression and variety of liquid, multiphase and vacuum pumping applications. It is estimated that almost 20% of world energy consumption is used for various means of gas compression and pumping. Therefore, reliability and efficiency of such machines have large impact on economy and ecology important for every manufacturer of such machines.
    Screw machines are normally designed with the aid of analytical tools, based often on one-dimensional flow models solved by numerical methods and validated by experiments. Continuing demands for improvements in accuracy when designing such machines for existing or new applications have generated a need to use advanced means of assessment of fluid flow and solid fluid interaction within these machines such as 3D Computational Fluid Dynamics and Computational Continuum Mechanics. The first use of CFD for analysis of screw machines was reported in late 1990’s. Since then, significant developments have been made to allow use of CFD in the design process of such machines. The most significant development which enabled such calculation methods was grid generation of the flow domains in software SCORG with the numerical grids capable of accurate and fast CFD calculation. This paper reviews the state of the art in application of CFD in modelling of positive displacement screw machines and outlines the benefits which the use of such techniques may bring. The paper also identifies challenges and future development trends in application of CFD for rotary positive displacement screw machines.

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  • Ahmed Kovacevic sits on the Board of Fluid Machinery Group since year 2011. Fluid Machinery Group organizes conferences, workshops and courses in the field of Fluid Machinery and steers policies in the field of these machines within the UK..