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Effective diffusivity k , k-epsilon model

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Old   August 25, 2011, 10:41
Default Effective diffusivity k , k-epsilon model
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in the effective diffusivity k, the sigma_k constant is left out. In the most cases its value is assumed to be 1.

Apparantly this term is not important. What is the reason behind it ? is it because the diffusivity is not known at all ?
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