# what are reynolds stresses

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 November 7, 2008, 14:48 what are reynolds stresses #1 UnderGroundMan Guest   Posts: n/a Hi When I run LES problem I get variables called reynolds stresses in post. Physically what are reynolds stresses? Thank you.

 November 8, 2008, 22:18 Re: what are reynolds stresses #2 Hossam Guest   Posts: n/a a very brief definition of the reynolds stresses (also called the turbulent stresses)would be the shear and normal stresses due turbulent fluctuations. actually the fundamental problem of the turbulent flow since the days of Reynolds 1896 untill now is how to model those stresses in order to close the system of equations, however, when using LES you are resolving them directly not modelling them, at least you are resolving the stresses which are due to the turbulent eddies larger than the grid cells, and modelling those that are smaller than the grid cells. thus you should be careful when generating the grid.

 November 10, 2008, 13:31 Re: what are reynolds stresses #3 underGroundMan Guest   Posts: n/a Hi Hossam In CFX-Post which stresses are have been directly resolved and which ones have been modelled. I have only found statistical reynolds stresses. Are they for resolved flow or modelled flow. Thanks you

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