Two Questions for Turbulence Modeling
Hi all
I have 2 questions, which I would be thankful for recieving their answers: 1 When using kepsilon model, what is the B.C. for the values of k and epsilon? 2 When adopting log. wall law, how does it work? give an example. Regards, 
I recommend you to read "An Introduction to Computational Fluid Dynamics" by Versteeg. it is good for start. and " Turbulence modeling for CFD" by Wilcox D.C. is very good in explanation of wall function.

Also good book "Computational Methods for Fluid Dynamics" by Ferziger is good.
the kepsilon model cant model the near wall region and thus a wall function is needed to solve the sub viscour near wall region. For this your meshing needs to be adequate so that y+ is between 30 and 300. This is what it is describing when mentioned log law. Also your BC for the flow and values for k and epsilon will be dependant on the flow. See software help for equations which may be used to get these values. 
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