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Reynolds stress calculation in Starccmplus

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Old   July 8, 2012, 15:28
Default Reynolds stress calculation in Starccmplus
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Hey guys, can anyone help how to get reynolds shear stress in starccmplus from k-epsilon or v2f model. Will really appreciate.

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Old   July 8, 2012, 17:02
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The components of the Reynolds stress tensor are not available with a k-epsilon model.
The turbulent kinetic energy k only represents the values on the diagonal of the reynolds stress tensor -> k=1/2*(uu+vv+ww)

The individual components are only accessible with a Reynolds-stress turbulence model, a LES or a DNS.
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Old   July 9, 2012, 04:57
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Can we find them through velocity gradients and eddy viscosity?
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Old   July 9, 2012, 07:48
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Unfortunately, we can't.
That is one of the disadvantages of two-equation turbulence models.
We only have two equations for turbulence quantities. The Reynolds stress tensor contains 6 independent variables.

Unless we use a turbulence model with 6 additional equations (like a reynolds stress model) or we obtain the reynolds stresses explicitly wit a LES or DNS, we don't have enough information about the flow to give an estimate for the individual components of the Reynolds stresses.
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