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CFL criteria in 2D flow

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Old   August 13, 2009, 10:34
Default CFL criteria in 2D flow
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Dear all,
I know that CFL must be smaller than unity in an unsteady 1d calculation disregarding diffusion. But I wonder what the criteria is in a 2D flow (no diffusion) ?

Thanks in advance
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Old   August 14, 2009, 09:02
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in 2D its same

but in the CFL number lambda will be the wave speed normal to the face on which you are computing the flux.
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