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#1 |
New Member
Joćo V. M. Andreotti
Join Date: May 2020
Posts: 2
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I'm trying to simulate the dynamic stall of a wing and due to the boundary layer refinements I'm getting very high courant numbers near the walls. The courant numbers for the rest of the flow seem to be ok (< 1). So, is it acceptable under these circumstances to have high courant numbers? And, for this application, what is a good criterion to set the time-step (I'm only interested in the large periodic oscillations in lift and drag)?
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,813
Rep Power: 73 ![]() ![]() ![]() |
Quote:
That sounds very strange, close to a wall the turbulent boundary layer is mainly governed by the viscous sub-layer. The cfl should be small. |
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Tags |
courant, courant number, implicit unsteady, stall, time advancement |
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