|April 5, 2009, 05:40||
wall functions.-E value, epsilon calculation
Join Date: Mar 2009
Posts: 20Rep Power: 6
I am reading through the wall functions code for OF and comparing it with fluent and I noticed some strange things:
1- For the value E instead of using 9.781 as fluent 9 is used.
2- When OF calculates the epsilon for the wall function uses the following formula:
epsilon_[faceCelli] +=Cmu75*pow(k_[faceCelli], 1.5)/(kappa_.value()*RASModel::y_[patchi][facei]);
In Fluent the same formula is used but what is bothering me is the faceCelli term. In fluent epsilon_ is calculated at the point (epsilonp), however, in OF the term epsilon_[faceCelli] seems to refer to the value at the wall.
Thank you in advance,
|September 10, 2009, 13:57||
Join Date: Jun 2009
Posts: 38Rep Power: 6
I'm also interested how OF is dealing with the wall functions.
So far I'm not really deep in it but about the E thing I found out that they overwriting the E=9 to E=9.8 in the respective turbulence Model with this autoCreateEpsilon (-Nut etc.) function.
|September 11, 2009, 18:54||
Join Date: May 2009
Posts: 70Rep Power: 6
I am also interested in OpenFOAM deals with wall functions. In which file did you find the
equation epsilon_[faceCelli] +=Cmu75*pow(k_[faceCelli], 1.5)/(kappa_.value()*RASModel::y_[patchi][facei]); you mention in 2.? Thanks a lot!
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