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August 25, 2016, 10:44 |
FSI-Courant number
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#1 |
Member
SMN
Join Date: Jun 2009
Location: CANADA
Posts: 71
Rep Power: 16 |
Hi,
In my transient fsi simulation, the RMS courant number is about 20. In the paper which i am trying to reproduce the results, it is mentioned that the courant number should be aorund 1. but my simulation does not converge if i reduce the time step. any suggestion please? thanks |
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August 25, 2016, 18:56 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,728
Rep Power: 143 |
The CFX fluid solver is implicit so is not restricted to Courant number = 1. An explicit solver is, they go unstable for Courant number >1.
But I do not know how implicit or explicit the FSI link between fluids and solids is. If it has significant explicit properties then it will impose a time step restriction which may be tighter than the fluids one alone. I would have a look at the allowable time step on the fluids simulation alone and the solid simulation alone. Obviously you will need to use the smallest one, and probably even a fraction of that. |
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