Journal
JOURNAL OF COMPUTATIONAL PHYSICS
Volume 184, Issue 2, Pages 366-380Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0021-9991(02)00020-7
Keywords
LES; large-eddy simulation; numerical error analysis; turbulence
Ask authors/readers for more resources
Numerical errors in large-eddy simulations (LES) arise from aliasing and discretization errors, and errors in the subfilter-scale (SFS) turbulence model. Using a direct numerical simulation (DNS) dataset of stably stratified shear flow to perform a priori tests, we compare the numerical error from several finite difference schemes to the magnitude of the SFS force. This is an extension of Ghosal's analysis [J. Comput. Phys. 125 (1996) 187] to realistic flow fields. By evaluating different grid resolutions as well as different filter-grid ratios, we provide guidelines for LES: for a second-order finite difference scheme, a filter-grid ratio of at least four is desired; for a sixth-order Pade scheme, a filter-grid ratio of two is sufficient. (C) 2002 Elsevier Science B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available