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-   -   Turbulent kinetic energy at wall? (http://www.cfd-online.com/Forums/fluent/109662-turbulent-kinetic-energy-wall.html)

 alanlove November 23, 2012 03:08

Turbulent kinetic energy at wall?

Hello, everyone:
I found the turbulent kinetic energy at wall was not 0,when I used no slip wall. I used three turbulence models one after one, k-epsilon,standard k-omega and k-omega SST. Wall Yplus was 1.5.
The turbulent kinetic energy at wall was error,then the turbulence viscosity and effective thermal conductivity near wall were wrong.
Someone can help me, teach me to let the turbulence kinetic energy at wall is 0.
Thank you.

 LuckyTran November 23, 2012 12:24

Quote:
 Originally Posted by alanlove (Post 393754) Hello, everyone: I found the turbulent kinetic energy at wall was not 0,when I used no slip wall. I used three turbulence models one after one, k-epsilon,standard k-omega and k-omega SST. Wall Yplus was 1.5. The turbulent kinetic energy at wall was error,then the turbulence viscosity and effective thermal conductivity near wall were wrong. Someone can help me, teach me to let the turbulence kinetic energy at wall is 0. Thank you.
Fluent uses the finite-volume-method. There is no way to force the turbulent kinetic energy to go to 0 at the walls, only the wall adjacent cells. The non-zero TKE is likely due to interpolation error from spatial discretization scheme. If the TKE is slightly non-zero (small deviations from 0) then I would not worry.

For wall adjacent cells, the variables are all determined from the wall-models, so it is unlikely that you will find any non-physical values there.

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