TY - GEN
T1 - Numerical and modeling issues in les of compressible turbulence on unstructured grids
AU - Park, Noma
AU - Mahesh, Krishnan
PY - 2007
Y1 - 2007
N2 - This paper discusses numerical and modeling issues that arise in cell-centered finite-volume methods (FVM) for large eddy simulation (LES) of compressible flows on unstructured grids. These are: accuracy and stability of flux interpolation scheme, shock capturing strategy, and subgrid-scale (SGS) modeling. To enhance the accuracy of flux reconstruction, a new scheme with added first derivative term from each cell center is proposed, and tested for various benchmark problems. It is shown that stability as well as accuracy is determined by the formulation of gradient at cell center. As a shock-capturing method, a characteristic based filter is formulated for cell-centered FVM on unstructured grids. The filter is combined with a sensor based on the local divergence and vorticity. Also, a one-equation subgrid model based on the subgrid kinetic energy transport equation for compressible flows is proposed.
AB - This paper discusses numerical and modeling issues that arise in cell-centered finite-volume methods (FVM) for large eddy simulation (LES) of compressible flows on unstructured grids. These are: accuracy and stability of flux interpolation scheme, shock capturing strategy, and subgrid-scale (SGS) modeling. To enhance the accuracy of flux reconstruction, a new scheme with added first derivative term from each cell center is proposed, and tested for various benchmark problems. It is shown that stability as well as accuracy is determined by the formulation of gradient at cell center. As a shock-capturing method, a characteristic based filter is formulated for cell-centered FVM on unstructured grids. The filter is combined with a sensor based on the local divergence and vorticity. Also, a one-equation subgrid model based on the subgrid kinetic energy transport equation for compressible flows is proposed.
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U2 - 10.2514/6.2007-722
DO - 10.2514/6.2007-722
M3 - Conference contribution
AN - SCOPUS:34250875084
SN - 1563478900
SN - 9781563478901
T3 - Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
SP - 8943
EP - 8960
BT - Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 45th AIAA Aerospace Sciences Meeting 2007
Y2 - 8 January 2007 through 11 January 2007
ER -