How to determine delta t for free surface flow -- CFD Online Discussion Forums

September 14, 2005, 12:52	How to determine delta t for free surface flow	#1
phsieh2005 Guest Posts: n/a	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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