International Conference on Compressors and their Systems 2017
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International Conference on Compressors and their Systems 2017

Short Course on Computational Fluid Dynamics in Rotary Positive Displacement Machines

3rdShort Course and Forum: Computational Fluid Dynamics in Rotary Positive Displacement Machines

9th and 10th September 2017                      (The submission of new contributions is closed)

Following the success of two previous forums/short-courses, on CFD in Positive Displacement Machines (PDM), in which there was strong participation from the compressor industry, CFD software providers and academia, the third event is dedicated to advanced topics in the application of CFD to PDM for industrial use and research. Topics to be covered include: grid generation, advances in CFD methods, multiphase and turbulence modelling, validation of CFD predictions, CAD integration and Industrial applications.

It was concluded from the results of the first two forums, that to increase the understanding of flow in compressors the following aspects of CFD in compressors need to be investigated further:

1) Accurate prediction and sensitivity of clearance size variation during operation on the leakage flow through the machines.

2) How modern CFD tools could be used to predict variation in gap size.

3) Stability and accuracy of Multiphase flow calculations in 3D simulations of compressors.

Participants from industry and academia are encouraged to present their research and analysis to the forum during the short-course. As with the 2nd short-course, laboratory, a dry air screw compressor test results are available to aid the above investigations. Talks covering theoretical aspects, as well as practical applications, will be presented at the short-course and attendees will benefit by getting an insight into the current state of the art.

Schedule

Saturday 9th September 2017:

09,00

Welcome and Introduction

Prof Ahmed Kovacevic

09,15

S1

Introduction to  CFD analysis in positive displacement machines

  • Fundamental governing equations
  • CFD modelling techniques
  • Fluid-Structure Interaction
  • Applications and Case studies

Prof Jan Vierendeels,

Ghent University, Belgium

10,45

 

Coffee Break

 

S2

Grid Generation for CFD in screw machines

Chair: A. Sayma

11,00

1

Grid generation and CFD analysis of screw machines

  • Historical perspective of CFD analysis for Screw Machines
  • Challenges in modelling screw machines
  • State-of-the-art Grid generation techniques for Twin Screw Machines

Prof Ahmed Kovacevic,

City, University of London, UK

11,45

2

New developments in Screw Machine grid generation and application to Multiphase flows

  • Grid generation with local refinement in leakage gaps
  • Differential Grid Generation using Elliptic PDE solver
  • Type and formulation of different solvers for more accurate resolution of leakage flows
  • Test cases, results and discussion

Dr Sham Rane,

City, University of London,

UK

12,30

 

Lunch Break

 

S3

CFD – Numerical Aspects and Modelling

Chair: A. Kovacevic

14,00

3

Modelling of compressor flows

  • CFD Solver fundamentals and Numerical aspects
  • Accuracy versus computational effort
  • Examples

Prof Abdulnaser Sayma,

City, University of London, UK

14,30

3

Multiphase flow modelling

  • Fundamentals and Numerical aspects
  • Accuracy versus computational effort
  • Examples

Prof Ali Ghobadian,  City, University of London, UK

15,00

2

Advanced numerical methods

  • Immersed Boundary Method
  • Higher order FVM for compressible flows

Prof Alfredo Pinelli,  City, University of London,

UK

15,45

 

Coffee Break

 

16,00

D1

Discussion 1 - Forum

Chair: A. Kovacevic

17,00

 

Close of Day 1

 

Sunday 10th September 2017:

S4

Turbulence Modelling

Chair:A. Kovacevic

9,30

1

(U)RANS and hybrid RANS/LES of flows in machineries: some perpetuating controversies

  • Interpretation of RANS in inherently unsteady flows
  • The role of RANS in hybrid RANS/LES of flows in complex configurations

Prof em Kemal Hanjalic,

Delft University of Technology,  Nl

10,30

Coffee Break

S5

Modelling flows in rotary machines - Application

Chair: J. Vierendeels

10,45

1

Analysis of Oil-free process gas twin screw compressors

  • Howden overview
  • Solution methodology, single phase modelling practises
  • Test cases, results and discussion

Mr Stuart Kennedy,

Ms Maria Wilson,  Howden, UK

11,30

2

  

12,15

3

15 Years of CFD Modelling Development at TRANE

  • TRANE/IR Compress Portfolio
  • CFD simulation development stages
  • Twin Screw and Scroll machines - Best Practises,   Test cases, results and discussion

Mr Scott Branch,     

Mr Matthew Cambio

TRANE, USA

13,00

 

Lunch Break

 

S6

Advanced topics related to CFD analysis

Chair: S. Rane

14,00

1

CFD Analysis of Vane Compressors, Expanders with Multiphase flows and Real Gas properties

  • Grid generation, ANSYS CFX and FLUENT implementation   Solution methodology
  • Test cases, Best Practises, results and discussion

Dr Giuseppe Bianchi,

City, University of London, UK

14,45

2

Real gas model and moving mesh in single-screw compressors and expanders

  • Mesh moving techniques in STAR-CCM+ and OPEN-FOAM
  • Grid generation and analysis of single-screw expander with real gas properties.
  • Assessment of single-screw expander

Mr Davide Ziviani,  

University of Ghent,

Belgium

15,30

2

Cut-Cell Method with Automatic Mesh Generation using CONVERGE CFD solver

  • Modified Cartesian cut-cell approach
  • CFD implementation and numerical errors associated
  • Test case, results and discussion

Dr David Rowinski, Convergent Science,

USA

16,15

 

Coffee Break

 

16,45

D1

Discussion 2 - Forum

Chair: A. Kovacevic

17,30

Close of the Short course

 

18,00

Reception for 10th International Conference on Compressors and Their Systems

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