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How to get yPlus with LaunderSharmaKE turbulence model

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Old   January 27, 2010, 08:08
Default How to get yPlus with LaunderSharmaKE turbulence model
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Jérémy Bulle
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Hello,

I have a working case with the LaunderSharmaKE turbulence model.

Now I'd like to get the yPlus to see if it's <1 like required for a low-re simulation. But apparently the yPlusRAS command doesn't work ...

I've seen posts related to this and users have created their own function to calculate it. But I don't understand why the yPlusRAS command doesn't work with the LaunderSharmaKE model and I don't know how to make my own function to calculate it ... I'm new to openFoam.

Your help would be much appreciated.
Thanks in advance.
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Old   January 27, 2010, 08:40
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Laurence R. McGlashan
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There's a function RASModel::yPlus which returns the yPlus values for a given patch and value of Cmu:
Code:
        //- Return yPlus for the given patch
        virtual tmp<scalarField> yPlus
        (
            const label patchI,
            const scalar Cmu
        ) const;
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Old   January 27, 2010, 08:44
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Jérémy Bulle
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Thanks for the answer

But this is not very practical since you can only have yPlus @patch and not everywhere.

I need it on the first cell after the wall to see if it's <1 there and there is not a patch there
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Old   January 27, 2010, 09:03
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Laurence R. McGlashan
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Oh, it's a low RE model. I don't know much about those so I'll shut up. You can alter yPlusRAS slightly so that it uses the wall shear stress directly to calculate y+ I suppose, instead of assuming the logarithmic profile.
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Old   January 27, 2010, 09:10
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Jérémy Bulle
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Yup,
Apparently that's what people have done from what I've read... If I don't get other answers I'll try to look at this

Thanks for your help & tips
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Old   January 31, 2010, 04:56
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Maybe the yplus can be get from the file /OpenFOAM-1.6/applications/utilites/preProcessing/applyBoundaryLayer/applyBoundaryLayer.C .
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