|July 15, 2010, 10:51||
choice of fvSchemes for high-aspect-ratio grid
Join Date: Dec 2009
Location: Darmstadt, Germany
Posts: 129Rep Power: 10
I'm trying to solve a compressible case with very big dimensions (about 5mx10mx20m) with high velocities at the same time (about 200 m/s). In order to get acceptable y+ values I had to apply a grid with boundary layers. Now I have cells with very high aspect ratio (>1000). Also there are some but not too strong non-orthogonal cells (<90)
To initialize the flow field I started a incompressible calculation with constant density. It looks not too bad, but as soon as I want to solve temperature equation (just as passive scalar) I get temperatures between 0 and 10,000 K (should be 300-700 K)!
I think this could be fought with using other divSchemes, but I've tried a lot (upwind, linear, linearUpwind with face or cellLimited ...) - without any success. CFX produced good results, but who knows what is happening in there ).
Any suggestion what I can try?
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