Towards large-eddy simulation of turbulent flows with complex geometric boundaries using immersed boundary method

Xiaolei Yang, Guo Wei He, Xing Zhang

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

2 Scopus citations

Abstract

Approximate immersed boundary conditions for large-eddy simulation (LES) of turbulent flows in combination with immersed boundary method are proposed. The approximate immersed boundary conditions are based on the fluxes and the shear stresses in order to ensure the momentum conservation: the velocity boundary conditions are imposed to the convection terms and the shear stress boundary conditions imposed to the diffusion terms. On a body-fitted grid, they are exactly the same as the non-penetration and wall stress boundary conditions, for the immersed boundary method they are now the generalized off-wall boundary conditions. This strategy is tested in turbulent channel flows with the wall not being aligned with Cartesian grids. The results obtained show the promising of this strategy in simulations of high Reynolds number turbulent flows. The effects of different eddy-viscosity models used in conjunction with approximate immersed boundary conditions need to be further investigated.

Original languageEnglish (US)
Title of host publication48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
StatePublished - Dec 13 2010
Event48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition - Orlando, FL, United States
Duration: Jan 4 2010Jan 7 2010

Other

Other48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition
CountryUnited States
CityOrlando, FL
Period1/4/101/7/10

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Yang, X., He, G. W., & Zhang, X. (2010). Towards large-eddy simulation of turbulent flows with complex geometric boundaries using immersed boundary method. In 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition [2010-0708]