High Order Numerical Methods for LES of Turbulent Flows with Shocks

Authors

D. V. Kotov, Stanford University
Helen Yee, NASA Ames Research CenterFollow
Abdellah Hadjadj, Fluid MechanicsFollow
A. Wray, NASA Ames Research Center
Bjorn Sjögreen, Lawrence Livermore National LaboratoriesFollow

Date of this Version

7-2014

Citation

The Eighth International Conference on Computational Fluid Dynamics (ICCFD8), Chengdu, Sichuan, China, July 14-18, 2014, ICCFD8-2014-xxxx.

Comments

U.S. government work.

Abstract

Simulation of turbulent flows with shocks employing explicit subgrid-scale (SGS) filtering may encounter a loss of accuracy in the vicinity of a shock. In this work we perform a comparative study of different approaches to reduce this loss of accuracy within the framework of the dynamic Germano SGS model. One of the possible approaches is to apply Harten’s subcell resolution procedure to locate and sharpen the shock, and to use a one-sided test filter at the grid points adjacent to the exact shock location. The other considered approach is local disabling of the SGS terms in the vicinity of the shock location. In this study we use a canonical shock-turbulence interaction problem for comparison of the considered modifications of the SGS filtering procedure. For the considered test case both approaches show a similar improvement in the accuracy near the shock.