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Pourous Media and turbulence

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Old   December 20, 2011, 14:37
Default Pourous Media and turbulence
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Matthias P
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Hey there,

i'm simulating an utility heat boiler with the heat exchanger surfaces treated as porous media. In the porous media the heat is extracted by a UDF source term for the energy equation. Turbulence is modeled with the realiazable k-epsilon model.
The mesh was generated with cutcell and therefore has very good quality.

My problem is that the turbulent viscosity ratio gets limited in the porous media regions and i can't explain why. Kinetic energy and dissipation rate is of low size. Is there a influence of the porous media on the calculation of the turbulent viscosity?
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