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April 6, 2016, 09:55 |
Automatic wall function parameters
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#1 |
New Member
Moritz
Join Date: Apr 2016
Posts: 2
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Hi,
i've got a question concerning the parameters used in the automatic wall function treatment when using the SST model. I am simulating the case of a temperatur dependent viscosity oil in a 2D-channel with wall heating. As shown in some papers with DNS in this topic, the elevation of the log-layer in the velocity distribution ist highly influenced by the viscosity ratio near the wall due to the heating. I have already simulated my case with a fine mesh and got the same result for the velocity distribution and the wall shear. Now the aim of that study is to get an acceptable result for a coarse mesh by implementing a model change. Therefore I want to modify the parameter C in the log law used for : I could not find anything on this case in the manual or other forum threads until now. Thanks for your help in advance |
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April 6, 2016, 20:14 |
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#2 | |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,847
Rep Power: 144 |
Quoting Opaque:
Quote:
From this thread: http://www.cfd-online.com/Forums/cfx...nce-model.html |
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April 7, 2016, 11:39 |
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#3 |
New Member
Moritz
Join Date: Apr 2016
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Thanks for your reply Glenn
I wasn't referring to the eddy viscosity but to the wall friction velocity. Anyway I found a way to modify the wall function for the momentum by activating beta features for physics and implementing a user defined wall function coefficient. |
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April 7, 2016, 19:15 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,847
Rep Power: 144 |
Oops, sorry - looks like I did not read your post close enough. Good to hear you found a way anyway.
By the way, you could probably also do this by defining your wall with a specified wall shear stress. |
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Tags |
automatic wall function, log law, sst |
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