12th International Conference on Compressors and their Systems

5th Short Course & Forum on Computational Fluid Dynamics in Rotary Positive Displacement Machines

9th and 10th September 2021

About the Short Course

Since 2013, the Centre for Compressor Technology at City, University of London has organised very successful forums/short-courses on CFD in Positive Displacement Machines (PDM). These typically contain a strong input from the compressor industry, CFD software providers and academia. Our fifth event in the series is dedicated to new methods and advanced topics in the application of chamber models, 3D CFD and experimental techniques in PDM such as:

  • Advances in grid generation, CFD tools, Open source CFD solvers and new techniques for PD machine analysis.
  • Applicability of new CFD methods such as Lattice Boltzmann Methods, Smoothed particle hydrodynamics, Mesh free algorithms.
  • Modelling leakage flows, conjugate heat transfer, stability and accuracy of Multiphase flow calculations.
  • Prediction of clearance gap sizes during operation and application of modern FSI computations
  • Advances in chamber modelling and hybrid 1D – 3D CFD coupled approaches.
  • Experimental techniques for analysis of PDM.

Who should participate

Participants from industry and academia are invited to present results of their research and analysis in the forum. To aid the research further; the forum will provide test results of dry air and oil injected twin screw compressors, a roots-blower, a dry air single screw expander and an ORC vane expander data for benchmark studies.

This short course/forum will bring benefits to engineers, engineering managers and specialists from industry, students, researchers and educators from academia and anyone who is interested in the modelling and design of rotary positive displacement machines. It will be presented by leading scientists and researchers from industry and academia and will give an insight into new technologies and the state of the art in the modelling PDM.

Programme in UK Time Zone

09,00 Welcome and Introduction Prof Ahmed Kovacevic
09,15 S1 Introduction to CFD analysis in positive displacement machines using FVM

  • Fundamental governing equations
  • CFD modelling techniques
  • Deforming grids, Fluid-Structure Interaction
Professor Hrvoje Jasak,

University of Cambridge,


10,30 Coffee Break
S2 CFD and Grid generation for Screw Machines Chair: TBC
10,45 1 Advances in Screw Machines technology

  • SECRET Project and Developments in CHT and Leakage flow –Experimental and Numerical
  • Historical perspective of CFD analysis of Twin Screw Machines
  • State-of-the-art Grid generation techniques
  • Lower order performance prediction models
Prof Ahmed Kovacevic,

City, University of London, UK

11,30 2 Deforming Grid and Modelling in Twin Screw Machines

  • New developments in Screw Machine grid generation using Elliptic PDEsolver
  • Grid Generation for variety of twin screw machines
  • CHT and FEM-FVM Solver coupling
Dr Sham Rane,

City, University of London,


12,15 Break
12,30 S3 Developments in Numerical Aspects and Modelling Chair: TBC
12,30 1 Screw Machine Integrated models – SCORG & GT Suite

  • GT Suite
  • Governing theory and solver technology
  • Applications of Compressor and Expander modelling
  • Optimisation and New developments
Mr JonathanHarrison,

Mr Jon Zenker,

Mr GauthamRamchandran

GammaTechnologies, USA

13,30 2 Flow modelling of oil-flooded screw compressors using a cut-cellbased mesh with adaptive refinement

  • Oil-flooded screw compressor test case
  • Multiphase, Gap flow modelling
  • Solver configuration, Pre/Post processing
Dr David Rowinski,

Convergent Science Inc.


14,15 3 Modelling Conjugate Heat Transfer in PD Compressors with Simerics-MP+

  • New Developments
  • Modelling Conjugate Heat Transfer in PD Compressors with Simerics-MP+
Dr Hui Ding,

Simerics Inc.


16,00 Q&A  Group B All
S4 Keynote on CFD and FSI Chair: TBC
09,15 1 OpenFOAM CFD solver for Large Deformation FSI

  • FSI solver in OpenFOAM
  • CFD implementation and numerical aspects
  • Applications
Prof Zeljko Tukovic

University of Zagreb, Croatia

10,30 Coffee Break
S5 Modelling of Vane Machines Chair: TBC
10,45 1 Analytical grid generation methodology and CFD simulations on sliding vane machines

  • CFD simulations in rotary vane machines
  • Analytical grid generation for non-circular housing and blade-offset arrangement for both single-acting and double-acting machines
  • ASNSYS Fluent solver validation of the CFD simulations is an ORC expander and energy recovery device for desalination
Dr Giuseppe Bianchi,

Mr Fanghua Ye,

Brunel University London


11,30 Break
S6 Modelling flows in rotary machines – Industrial Applications Chair: TBC
11.45 1 CFD Analysis and ANSYS solutions for Positive Displacement Machines

  • ANSYS CFX and FLUENT methodology
  • ANSYS Forte methodology
  • Gap flow modelling
  • Test cases and other application examples
Mr Bill Holmes,



12,30 2 Open source analysis and design of PD machines

  • PD simulation techniques in OF.
  • SCORG coupling with OF and CFD analysis of Twin-screw machines.
  • Scroll meshing strategy and implementation in OF. CFD simulation of Scroll machines.
  • CFD integration in 1D tool for the support in the design. PDSim Description and OF integration. PDSim vs CFD result comparison.
Mr Nicola Casari, Ettore Fadiga, Pinelli Michele,

University of Ferrara, Italy

Dr Davide Ziviani,

Purdue University,


13,15 Break
S7 Advanced topics related to CFD analysis Chair: TBC
14.15 1 Experimental techniques to study heat transfer and flow field in clearances of positive displacement machines

  • Planar Laser-Induced Fluorescence (PLIF) to visualize the temperature field.
  • Flow in optical roots blower by phase-locked PIV, Vortex distribution, CFD flow validation.
  • Physics of heat transfer and flow dynamics in the clearance gaps.
Mr Brijeshkumar Patel

City, University of London,


15,00 2 Forum/Panel Q&A for Group B + C All
16,00 2 Numerical study of different type of customised mesh for twin screw vacuum pumps

  • Algorithms, Application to Twin Screw Rotor
  • Vacuum pumps
  • Low vi Screw Compressors and CFD analysis
Mr Yang Lu,

City, University of London,


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