Numerical and modeling issues in les of compressible turbulence on unstructured grids

Noma Park, Krishnan Mahesh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

16 Scopus citations

Abstract

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.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
Pages8943-8960
Number of pages18
StatePublished - Jul 2 2007
Event45th AIAA Aerospace Sciences Meeting 2007 - Reno, NV, United States
Duration: Jan 8 2007Jan 11 2007

Publication series

NameCollection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
Volume13

Other

Other45th AIAA Aerospace Sciences Meeting 2007
CountryUnited States
CityReno, NV
Period1/8/071/11/07

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  • Cite this

    Park, N., & Mahesh, K. (2007). Numerical and modeling issues in les of compressible turbulence on unstructured grids. In Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting (pp. 8943-8960). (Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting; Vol. 13).