CFD Online Discussion Forums - k-omega SST and wall functions in OpenFOAM-1.5-dev

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- - k-omega SST and wall functions in OpenFOAM-1.5-dev (https://www.cfd-online.com/Forums/openfoam-solving/84266-k-omega-sst-wall-functions-openfoam-1-5-dev.html)

Quote:

Originally Posted by mehrdad_kbg (Post 343110)

if some one is using low Reynolds number option of the SST kw it means that the flow has different layers and a very fine resolution of the mesh is required close to the wall. this needs a mesh with a y-plus less than at least 5. Therefore in this case no wall function can be used.

but isn't it always laminar flow very close to the wall? so should it have a low Reynolds number regardless?

I also have the very same question that Anne had many posts back, so I would just like to get clarification:

If I have a fine mesh which aims to resolve the boundary layer with y+ < 1 what boundary conditions are appropriate for the problem? Is the following correct for a wall patch? The current issue I have is that when I use the omegaWallFunction on my walls, I get a massive value of omega at the wall (about 1e8)

Code:

omegaWallPatch

{

    type        zeroGradient;

}



nutWallPatch

{

    type        calculated;

}



kWallPatch

{

    type        fixedValue;

    value       uniform 1e-10;

}