LES of a square cylinder
I am having what I presume are inlet or grid quality issues with an LES case for a square cylinder. As can be seen in the attached images, the inflow to the left of the cylinder shows a strange behaviour with a variation of U (in attached image, coloured by U mag). My initial guess was that the aspect ratio or the grid quality overall is not good enough for LES. My grid does pass all checks inside of checkMesh.
I am using the dynamic Smagorinsky model (simple filter and cubeRootVol delta) with a hex + polyhedra (due to local refinement) grid of ~1.6 million cells. The Re = 22,000 and y+ average = ~6 after approximately 20 non-dimensional flow-overs, which I presume could be an issue as well as I am using the nuSgsWallFunction on the cylinder wall patch. I will try to construct a y+=1 grid and avoid the use of wall functions next.
My nuSgs file:
Sorry, but I have to say your mesh looks bad, and is better not be called LES.
And what's more, it seems your inlet has a velocity profile, that's strange, isn't it?
You can upload your case file in tgz format, so that we could have a look, we need 0/ constant/ system/
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