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CFL for explicit hypersonic problem

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Old   October 28, 2007, 10:20
Default CFL for explicit hypersonic problem
Subramani Sockalingam
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Hi, How do I determine the CFL number for an explicit hypersonic problem? Is there any book or paper?

Thanks, Subramani
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Old   October 29, 2007, 06:05
Default Re: CFL for explicit hypersonic problem
Ervin Amet
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Hello For explicit problems, your CFL number should not be greater than 1, for stability reasons. Altough that depends on how complicated is your geometry, time marching scheme, etc. Try using CFL=1 for start in order to allow a maximum time step (to accelerate the convergeance). If it's instable, try lowering a little, 0.8..0.9. or use under relaxation. The best way in my oppinion is to begin with a CFL < 1, let's say 0.8, and after that switch to CFL=1.
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