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Old   December 1, 2008, 10:13
Default Ansys CFX Atmospheric Boundary Layer
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Marco
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Hi guys, I have a problem with a simulation in Ansys CFX. I have a big domain (about 500 x 100 x 1000m), logarithmic velocity profile in inflow, roughness on the ground and nothing else. But my simulation doesn´t work if reynolds number are higher then almost 10e8. This is quite strange because reynolds number shouldn´t be a problem for Ansys. Do you have any suggestion where is my problem?

thanks a lot

Marco
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Old   December 1, 2008, 21:46
Default Re: Ansys CFX Atmospheric Boundary Layer
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Glenn Horrocks
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Hi,

The problem in very high Re flow is almost always transient structures causing a steady state simulation to diverge. I am not sure how to get these flow to converge as steady state (any ideas anyone? I have tried this briefly but failed so far), so the best thing I can recommend is to run transient and resolve the transients. Also check to see whether the transient features are significant.

Glenn Horrocks
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