Lesfoil

Large Eddy Simulation of Flow Around a High Lift Airfoil: Results of the Project Lesfoil Supported by the European Union 1998 2001

By: Lars Davidson, Davor Cokljat, Jochen Frohlich

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Hardcover | 9 May 2003

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264 Pages

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22.86 x 15.24 x 0.64

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Large Eddy Simulation is a relatively new and still evolving computatio nal strategy for predicting turbulent flows. It is now widely used in research to elucidate fundamental interactions in physics of turbulence, to predict phe nomena which are closely linked to the unsteady features of turbulence and to create data bases against which statistical closure models can be asses sed. However, its applicability to complex industrial flows, to which statisti cal models are applied routinely, has not been established with any degree of confidence. There is, in particular, a question mark against the prospect of LES becoming an economically tenable alternative to Reynolds-averaged N avier-Stokes methods at practically high Reynolds numbers and in complex geometries. Aerospace flows pose particularly challenging problems to LES, because of the high Reynolds numbers involved, the need to resolve accura tely small-scale features in the thin and often transitional boundary layers developing on aerodynamic surfaces. When the flow also contains a separated region - due to high incidence, say - the range and disparity of the influen tial scales to be resolved is enormous, and this substantially aggravates the problems of resolution and cost. It is just this combination of circumstances that has been at the heart of the project LESFOIL to which this book is devoted. The project combined the efforts, resources and expertise of 9 partner organisations, 4 universities, 3 industrial companies and 2 research institu tes.

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Introduction	p. 1
Preparatory Work	p. 7
Task 1: Subgrid models	p. 9
Summary of work progress	p. 9
Task 1.1: Grid generation	p. 9
Unstructured grids	p. 9
Structured C-grids	p. 9
Task 1.2: Generation of database with DNS	p. 11
Task 1.3: Development and evaluation of subgrid models in simple
configurations	p. 11
Evaluated subgrid-scale models	p. 12
Conclusion	p. 20
Task 2: Near-wall models	p. 22
Introduction	p. 22
Overview of Research	p. 23
Chalmers	p. 25
The Hybrid LES-RANS model	p. 26
CERFACS	p. 30
University of Karlsruhe	p. 33
UMIST/QMW	p. 42
Conclusions and Overall assessment	p. 53
Task 4: Numerical methods	p. 58
Introduction	p. 58
Contribution by Chalmers	p. 59
Performance Assessment	p. 59
Speed-up	p. 59
Deferred correction	p. 60
PISO and SIMPLEC	p. 60
Spatial Discretisation	p. 61
Contribution by Fluent	p. 61
Performance Assessment	p. 61
Discretization Scheme	p. 62
Accuracy assessment	p. 63
Velocity Profiles	p. 65
Contribution by University of Karlsruhe	p. 65
Fourier solver for the p' equation	p. 65
Implications of 2D/3D Zonal reinement method on Fourier solver	p. 66
Contribution by ONERA	p. 67
Contribution by University of Surrey	p. 68
Contribution by UMIST	p. 69
Solution of momentum equations	p. 69
Time-step control	p. 69
The pressure equation	p. 69
Domain decomposition and parallelization	p. 70
Partial diagonalisation	p. 70
Multigrid algorithm	p. 70
Performance Assessment	p. 70
Achievements and recommendations	p. 71
The Airfoil Investigations	p. 73
Task 5: Airfoil Computations	p. 75
Introduction	p. 75
The Principal Airfoil Geometry	p. 75
Common Mesh	p. 77
Contribution by Chalmers	p. 80
Numerical Method	p. 80
Boundary Conditions	p. 80
Convergence Criteria	p. 81
Computations	p. 81
Conclusions	p. 94
Contribution by Alenia	p. 97
Objectives	p. 97
Numerical method	p. 97
Turbulence models	p. 98
Steady low computations	p. 98
Unsteady RANS computations	p. 101
Conclusions	p. 103
Recommendations for future work	p. 103
Contribution by CERFACS	p. 105
Introduction	p. 105
Numerical schemes	p. 106
Wall functions	p. 107
Airfoil Calculations	p. 107
Conclusions	p. 118
Contribution by Dassault-Aviation	p. 119
Description of the Navier-Stokes code	p. 119
Towards LES	p. 122
Application to the A-airfoil	p. 124
Comparison of LES results using different SGS models	p. 126
Comparison between RANS and LES	p. 130
Conclusions	p. 133
Contribution by FLUENT	p. 135
Introduction	p. 135
Model Description	p. 135
The Mesh	p. 137
Numerical Details	p. 139
Results	p. 140
Conclusions	p. 147
Contribution by University of Karlsruhe	p. 148
LES resolution requirements	p. 148
Computational Eiciency	p. 149
Transition modelling	p. 150
Airfoil calculations	p. 154
Conclusions	p. 165
Contribution by ONERA	p. 167
Introduction	p. 167
Simulation method	p. 167
Subgrid Scale Modelling	p. 167
Euler Flux Discretization	p. 168
2D/3D coupling method	p. 169
Computational Setup	p. 170
Results and Discussion	p. 173
Conclusions	p. 182
Contribution by QMW	p. 184
Overview	p. 184
The Numerical Method	p. 187
Simulations and Results	p. 190
Conclusions	p. 198
Lessons Learned	p. 201
Synthesis of the Airfoil Flow Simulations	p. 203
Common Mesh Comparisons	p. 203
Trailing edge geometry	p. 207
Final Results Comparisons	p. 208
Subgrid-Scale Modelling	p. 216
Near-Wall modelling	p. 217
Transition Treatment	p. 219
Synthesis conclusions	p. 220
Conclusions and Outlook	p. 223
References	p. 233
Addresses of Partners	p. 241
Table of Contents provided by Publisher. All Rights Reserved.

Lesfoil

Large Eddy Simulation of Flow Around a High Lift Airfoil: Results of the Project Lesfoil Supported by the European Union 1998 2001

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