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June 16, 2012, 03:09 |
Two Questions for Turbulence Modeling
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#1 |
Member
Mohammad Sarfaraz
Join Date: Feb 2010
Posts: 35
Rep Power: 16 |
Hi all
I have 2 questions, which I would be thankful for recieving their answers: 1- When using k-epsilon 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, |
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June 17, 2012, 00:43 |
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#2 |
Senior Member
Mehdi Baba Mehdi
Join Date: Jan 2011
Posts: 158
Rep Power: 15 |
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.
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June 18, 2012, 06:35 |
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#3 |
New Member
Chris
Join Date: Nov 2011
Posts: 16
Rep Power: 14 |
Also good book "Computational Methods for Fluid Dynamics" by Ferziger is good.
the k-epsilon 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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