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Relative roughness in openfoam

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Old   August 28, 2013, 02:10
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Vishal
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Thanks.
I will have a look at the links.
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Originally Posted by Mojtaba.a View Post
Right now I have found this article which is quite useful:
www.engmech.cz/2012/proceedings/pdf/195_Furst_J-FT.pdf‎

It uses openFOAM and a new turbulence model which is best for laminar turbulent transition modeling.
The link you mentioned above is not opening.

I do not want to go into the complications of LES since I will be using kOmegaSST only.

The problem i am facing now is that in the pitzDaily case does not show continuous vortices as it showed with LES. I am using kOmegaSST turbulence model. I am using wall functions and my flow has a very high reynolds number.

pitzDaily.zip
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Old   August 28, 2013, 05:21
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Mojtaba Amiraslanpour
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Quote:
The link you mentioned above is not opening.
Check this link:
http://www.engmech.cz/2012/proceedin...Furst_J-FT.pdf
Quote:
The problem i am facing now is that in the pitzDaily case does not show continuous vortices as it showed with LES. I am using kOmegaSST turbulence model. I am using wall functions and my flow has a very high reynolds number.
Have you set the right y+ values (Or in other meaning, first cell height) to the correct values?
Provided links has a comprehensive procedure to calculate first cell height.

Right now I am working on kkLOmega model which is best for capturing laminar turbulent transition.

I will report if I get anything useful.
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Old   October 8, 2014, 17:07
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Quote:
Originally Posted by Mojtaba.a View Post
Check this link:
http://www.engmech.cz/2012/proceedin...Furst_J-FT.pdf


Have you set the right y+ values (Or in other meaning, first cell height) to the correct values?
Provided links has a comprehensive procedure to calculate first cell height.

Right now I am working on kkLOmega model which is best for capturing laminar turbulent transition.

I will report if I get anything useful.
Hi, I want to add skin roughness to my LES turbulent mode , is it possible? I found in LES mode the surface is smooth. How can I do that?
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