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How to determine delta t for free surface flow

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Old   September 14, 2005, 11:52
Default How to determine delta t for free surface flow
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phsieh2005
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Hi,

For single fluid flow, one generally use Courant number to determine delta t. How about flows with free surface?

Someone gave me this criterion in the past:

dt < min (SQRT((rho/sigma) (ds/PI)^3))

where rho is density, sigma is surface tension coef, ds is the cell length along the interface.

Is this correct? Does anybody knows where this comes from? Thanks!

phsieh2005
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