need help (SGS viscosity)
is there are anyone know the different between SGS viscosity (LES model) and turbulent viscosity (K-omega model)?
Thank you very much! |
The difference is the way in which the turbulent stresses are filtered or averaged.
In any RANS model the turbulent viscosity is derived from the difference between the actual value and the time averaged value. In SGS, the turbulent viscosity is derived from the difference between teh actual values of velocities and the resolved velocities (obtained from sub-grid filters). |
:) Thank you very very much!
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you said that sub grid scale stress provide the effect of just a small fraction of reynolds stress, so is this mean, change another word, the sub grid scale stress just divide my grid into more smaller and then caculate this smaller grid? By the way, I am a beginner in CFD, I am not so sure that is a silly question! Thank you in advance! |
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