LESFOIL: Large Eddy Simulation of Flow Around a High Lift Airfoil : Results of the Project LESFOIL Supported by the European Union 1998 - 2001 - Couverture souple
Synopsis
I. Introduction.- II. Preparatory Work.- 1 Task 1: Subgrid models.- 1.1 Summary of work progress.- 1.2 Task 1.1: Grid generation.- Unstructured grids.- Structured C-grids.- 1.3 Task 1.2: Generation of database with DNS.- 1.4 Task 1.3: Development and evaluation of subgrid models in simple configurations.- Evaluated subgrid-scale models.- 1.5 Conclusion.- 2 Task 2: Near-wall models.- 2.1 Introduction.- 2.2 Overview of Research.- 2.3 Chalmers.- The Hybrid LES-RANS model.- 2.4 CERFACS.- 2.5 University of Karlsruhe.- 2.6 UMIST/QMW.- 2.7 Conclusions and Overall assessment.- 3 Task 4: Numerical methods.- 3.1 Introduction.- 3.2 Contribution by Chalmers.- Performance Assessment.- Speed-up.- Deferred correction.- PISO and SIMPLEC.- Spatial Discretisation.- 3.3 Contribution by Fluent.- Performance Assessment.- Discretization Scheme.- Accuracy assessment.- Velocity Profiles.- 3.4 Contribution by University of Karlsruhe.- Fourier solver for the p' equation.- Implications of 2D/3D Zonal refinement method on Fourier solver.- 3.5 Contribution by ONERA.- 3.6 Contribution by University of Surrey.- 3.7 Contribution by UMIST.- Solution of momentum equations.- Time-step control.- The pressure equation.- Domain decomposition and parallelization.- Partial diagonalisation.- Multigrid algorithm.- Performance Assessment.- 3.8 Achievements and recommendations.- III. The Airfoil Investigations.- 4 Task 5: Airfoil Computations.- 4.1 Introduction.- The Principal Airfoil Geometry.- Common Mesh.- 4.2 Contribution by Chalmers.- Numerical Method.- Boundary Conditions.- Convergence Criteria.- Computations.- Conclusions.- 4.3 Contribution by Alenia.- Objectives.- Numerical method.- Turbulence models.- Steady flow computations.- Unsteady RANS computations.- Conclusions.- Recommendations for future work.- 4.4 Contribution by CERFACS.- Numerical schemes.- Wall functions.- Airfoil Calculations.- Conclusions.- 4.5 Contribution by Dassault-Aviation.- Description of the Navier-Stokes code.- Towards LES.- Application to the A-airfoil.- Comparison of LES results using different SGS models.- Comparison between RANS and LES.- Conclusions.- 4.6 Contribution by FLUENT.- Model Description.- The Mesh.- Numerical Details.- Results.- Conclusions.- 4.7 Contribution by University of Karlsruhe.- LES resolution requirements.- Computational Efficiency.- Transition modelling.- Airfoil calculations.- Conclusions.- 4.8 Contribution by ONERA.- Simulation method.- Subgrid Scale Modelling.- Euler Flux Discretization.- 2D/3D coupling method.- Computational Setup.- Results and Discussion.- Conclusions.- 4.9 Contribution by QMW.- Overview.- The Numerical Method.- Simulations and Results.- Conclusions.- IV. Lessons Learned.- 5 Synthesis of the Airfoil Flow Simulations.- 5.1 Common Mesh Comparisons.- 5.2 Trailing edge geometry.- 5.3 Final Results Comparisons.- 5.4 Subgrid-Scale Modelling.- 5.5 Near-Wall modelling.- 5.6 Transition Treatment.- 5.7 Synthesis conclusions.- V. Conclusions and Outlook.- VI. References.- VII. Addresses of Partners.
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