Which Solver/Model to use for flow over Circular Cylinder ? Re [1 , 10^6]

WolfgangS. · December 4, 2010, 09:11

hi guys!

I have a solver-question and need your experience. Want to simulate and compare (with literatur) the flow over a circular cylinder for Re = 1 till 1 000 000 with blockMesh and snappyHexMesh.

This will be my first work with OpenFoam and i have no experience with different solvers and models. Up to now i only used simpleFoam kOmegaSST from the motorbike tutorial, because my forrunner used it. But in my case i think it doesn´t work very well.

Can somebody tell me what solver/model would be the best for what Re-region???

Thanks in advance!

best regards
Wolfgang

markusrehm · December 6, 2010, 03:48

Hi Wolfgang,

as long as your flow is incompressible (Ma<0.3) you can stay with simpleFoam. The kWSST model is ok as well. You can also change to k-epsilon which I find is a bit more robust.

You must especially be careful with the wall functions (nutWallFunction in 0/nut). For the standard wall function the yPlus should be around 30 ... 300. So you need to adapt the grid for every Re.

Markus

December 4, 2010, 09:11	Which Solver/Model to use for flow over Circular Cylinder ? Re [1 , 10^6]	#1
WolfgangS. New Member Wolfgang Strauss Join Date: Nov 2010 Location: Germany / Bavaria / Eichstätt Posts: 15 Rep Power: 16	hi guys! I have a solver-question and need your experience. Want to simulate and compare (with literatur) the flow over a circular cylinder for Re = 1 till 1 000 000 with blockMesh and snappyHexMesh. This will be my first work with OpenFoam and i have no experience with different solvers and models. Up to now i only used simpleFoam kOmegaSST from the motorbike tutorial, because my forrunner used it. But in my case i think it doesn´t work very well. Can somebody tell me what solver/model would be the best for what Re-region??? Thanks in advance! best regards Wolfgang

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December 6, 2010, 03:48		#2
markusrehm Senior Member Markus Rehm Join Date: Mar 2009 Location: Erlangen (Germany) Posts: 184 Rep Power: 17	Hi Wolfgang, as long as your flow is incompressible (Ma<0.3) you can stay with simpleFoam. The kWSST model is ok as well. You can also change to k-epsilon which I find is a bit more robust. You must especially be careful with the wall functions (nutWallFunction in 0/nut). For the standard wall function the yPlus should be around 30 ... 300. So you need to adapt the grid for every Re. Markus