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July 8, 2012, 15:28 |
Reynolds stress calculation in Starccmplus
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#1 |
New Member
Jahed
Join Date: Jul 2012
Posts: 3
Rep Power: 13 |
Hey guys, can anyone help how to get reynolds shear stress in starccmplus from k-epsilon or v2f model. Will really appreciate.
Jahed |
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July 8, 2012, 17:02 |
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#2 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,399
Rep Power: 46 |
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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July 9, 2012, 07:48 |
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#4 |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,399
Rep Power: 46 |
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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