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E-raamat: Unsteady Turbulent Flow Modelling and Applications

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  • Sari: BestMasters
  • Ilmumisaeg: 28-Jan-2016
  • Kirjastus: Springer Vieweg
  • Keel: eng
  • ISBN-13: 9783658119126
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Unsteady Turbulent Flow Modelling and ApplicationsSuurem pilt
  • Formaat: PDF+DRM
  • Sari: BestMasters
  • Ilmumisaeg: 28-Jan-2016
  • Kirjastus: Springer Vieweg
  • Keel: eng
  • ISBN-13: 9783658119126
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The master thesis of David Roos Launchbury deals with the implementation and validation of a numerical solver for incompressible large eddy simulation (LES) with heat transfer in OpenFOAM. Academic and industrial cases, ranging from flow between parallel plates to film cooling, are investigated utilising existing and newly-implemented turbulence models. Simulations using no turbulence models, i.e. under-resolved DNS (UDNS) simulations, are performed for comparison. Very good results are obtained in all cases with variations among the individual models, with the UDNS simulations performing surprisingly well. The study shows that the developed software is able to simulate complex cases reliably and accurately.

Large Eddy Simulation.- Subgrid Models.- Solver.- Validation.- Parallel Performance.- Recommendations for LES Simulations.
Nomenclature xi
List of Figures
xiii
List of Tables
xv
1 Introduction
1(2)
2 Large Eddy Simulation
3(4)
3 Subgrid Models
7(8)
3.1 Smagorinsky Model
8(1)
3.2 Dynamic Smagorinsky Model
9(1)
3.3 Dynamic Lagrangian Model
10(1)
3.4 Dynamic One-Equation Model
10(1)
3.5 WALE Model
11(1)
3.6 Sigma Model
12(3)
4 Solver
15(8)
4.1 Basics
15(1)
4.2 Improvements
16(7)
4.2.1 Pressure-Velocity Coupling
16(2)
4.2.2 Turbulence Models
18(1)
4.2.3 Momentum Source Term
19(1)
4.2.4 Energy Equation and Source Term
20(3)
5 Validation
23(36)
5.1 Overview
23(1)
5.2 Periodic Channel Flow
24(13)
5.2.1 Description
24(1)
5.2.2 Setup
25(1)
5.2.3 Mesh
26(2)
5.2.4 Results
28(9)
5.3 Square Cylinder
37(6)
5.3.1 Description
37(1)
5.3.2 Setup
37(2)
5.3.3 Mesh
39(1)
5.3.4 Results
40(3)
5.4 Ribbed Channel
43(7)
5.4.1 Description
43(1)
5.4.2 Setup
43(2)
5.4.3 Mesh
45(1)
5.4.4 Results
46(4)
5.5 Film Cooling
50(7)
5.5.1 Description
50(1)
5.5.2 Setup
50(2)
5.5.3 Mesh
52(2)
5.5.4 Results
54(3)
5.6 Comments on the Results
57(2)
5.6.1 No-Model Results
57(1)
5.6.2 Grid Resolution
57(2)
6 Parallel Performance
59(4)
7 Recommendations for LES Simulations
63(6)
7.1 Discretisation Schemes
63(1)
7.2 Linear Solvers
64(1)
7.3 Initial Values
64(1)
7.4 Grid Resolution
65(1)
7.5 Mesh Quality
66(3)
8 Conclusions
69(2)
9 Unresolved Issues
71(2)
10 Outlook
73(10)
A Appendix: Recent Developments 83
David Roos Launchbury finished his Masters Degree in Mechanical Engineering in Horw, Switzerland, and is currently working as research associate at Lucerne University of Applied Sciences and Arts Engineering and Architecture.





 
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