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Temperature gradient using wall-functions

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Old   February 7, 2011, 17:38
Default Temperature gradient using wall-functions
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Andreas Schwärzle
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I am calculating a channel flow including heat transfer. I'm using the k-epsilon model and pisoFoam solver. Since the flow is incompressible, I added the temperature energy equation to the solver, similar to the following link:

The mesh I use is a high-Re mesh, and therefore I have to use wall-functions.
To calculate the heat flux at the wall (constant temperature) I need the temperature gradient at the wall.
Now the question: Is there a (relatively) simple approach in calculating the this temperature gradient using the wall function equations? (something similar to the tool wallShearStress)
I think a similar tool within Fluent would be the wall function heat transfer coefficient.

To compare: the wallShearStress tool gives good results concerning the shear stress, while calculating the shear stress using the wallGradU-tool gives far too small values

Thanks a lot for your help
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gradient, heat flux, heat transfer, k-epsilon, wall functions

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