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turbulent kinetic energy condition at wall

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Old   November 24, 2008, 16:24
Default turbulent kinetic energy condition at wall
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a very simple question. I always thought that, since in DNS the trace of the reynolds stress tensor is null at wall, a suitable condition for RANS calculation would be to fix the value of k=0 there. However, I recently came across a thesis in which a guy using Fluent used a zero derivative for k at the wall, and also an OpenFOAM tutorial with the same condition. Boths use wall function. I wanted to know the logic behind this.


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