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Zonal Embedded Grids for LES of Self-Sustaining Structures of Wall Turbulence

Zonal Embedded Grids for LES of Self-Sustaining Structures of Wall Turbulence
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摘要 In this study,a zonal grid refinement method based on the solution of weakly compressible flow equations with large eddy simulation in the finite volume method(FVM) and dynamic subgrid-scale model framework was used to simulate the turbulence structures of a plane-wall flow with Reynolds number Re=U0δ /ν =10 000.Comparison and analysis were conducted on the distributions of time-averaged velocity and velocity fluctuations,as well as on the actual near-wall structures,to verify the accuracy of the turbulence features that were simulated using the zonal grid refinement method.The results show that the zonal embedded grid is a very efficient way to illustrate the turbulence structures of the near-wall region.The present method is easy to implement and extend to small Mach number flow modeling on a collocated irregular FVM mesh system. In this study,a zonal grid refinement method based on the solution of weakly compressible flow equations with large eddy simulation in the finite volume method(FVM) and dynamic subgrid-scale model framework was used to simulate the turbulence structures of a plane-wall flow with Reynolds number Re=U0δ /ν =10 000.Comparison and analysis were conducted on the distributions of time-averaged velocity and velocity fluctuations,as well as on the actual near-wall structures,to verify the accuracy of the turbulence features that were simulated using the zonal grid refinement method.The results show that the zonal embedded grid is a very efficient way to illustrate the turbulence structures of the near-wall region.The present method is easy to implement and extend to small Mach number flow modeling on a collocated irregular FVM mesh system.
出处 《Tsinghua Science and Technology》 SCIE EI CAS 2010年第5期555-560,共6页 清华大学学报(自然科学版(英文版)
基金 Supported by the National Natural Science Foundation of China(No 51079071) State Key Laboratory of Hydroscience and Engineering Program of China (Nos 2008-TC-1, 2009-TC-2, and 2009-ZY-8)
关键词 wall turbulence zonal grid refinement large eddy simulation weakly compressible flow finite volume method wall turbulence zonal grid refinement large eddy simulation weakly compressible flow finite volume method
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