How to determine delta t for free surface flow
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!
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