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Fourth International Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2005, Marriot Hotel, Williamsburg, Virginia, USA

DOI: 10.1615/TSFP4

NUMERICAL STUDY OF SEPARATION FLOWS WITH LES/RANS HYBRID APPOACHES

pages 577-582
DOI: 10.1615/TSFP4.970
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RESUMO

Large-eddy-simulation (LES) and Reynolds-Averaged Navier-Stokes (RANS) hybrid methods were applied for the separated flows at high angles of attack (AOA) around Aerospatial A-profile and prolate spheroid. These hybrid methods are based on algebraic Baldwin-Lomax (B-L) model through combining the similar profile of eddy viscosity of B-L and Smagrinsky sub-grid models, on Spalart-Allmaras (S-A) and Menter's k-ω shear-stress-transport (SST) models by replacing the length scale in the original turbulence models, and on Menter's k-ω SST model through a blending function The main objective of this paper is to apply the hybrid methods and compare with RANS methods based on the same turbulence models for high Reynolds separated flows. All the hybrid methods were designed to have a RANS mode near the solid wall and have a LES behavior in the core flow region. At the same time, fourth-order central scheme with particle artificial viscosity was applied as the spatial method and fully implicit Lower-Upper Symmetric-Gauss-Seidel with pseudo time sub-iteration (LU-SGS-τTS) was chosen as the temporal methods in this study. Comparison with experimental data was carried out for pressure, skin friction and the profiles of velocity, etc. Reasonable agreement, accounting the effect of turbulence models, was obtained for these separated flows.

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