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Computation of backward‐facing step flows by a second‐order Reynolds stress closure model
Author(s) -
Hwang Robert R.,
Peng Y. F.
Publication year - 1995
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/fld.1650210304
Subject(s) - reynolds stress , mechanics , reynolds stress equation model , turbulence , computation , dissipation , closure (psychology) , instability , finite volume method , mathematics , reynolds number , k epsilon turbulence model , shear stress , numerical stability , physics , k omega turbulence model , numerical analysis , mathematical analysis , thermodynamics , algorithm , economics , market economy
This paper scrutinizes the predictive ability of the differential stress equation model in complex shear flows. Two backward‐facing step flows with different expansion ratios are solved by the LRR turbulence model with an anisotropic dissipation model and the near‐wall regions of the separated side resolved by a near‐wall model. The computer code developed for solving the transport equations is based on the finite‐volume‐finite‐difference method. In the numerical solution of the time‐averaged momenum equations the Reynolds stresses are treated partially as a diffusion term and partially as a source term to avoid numerical instability. Computational results are compared with experimental data. It is found that the near‐wall region of the separated side resolved by the near‐wall model, the LRR model with a simple modification of an anisotropic dissipation model can predict backward step flows well.