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-   -   How to determine delta t for free surface flow (http://www.cfd-online.com/Forums/main/9881-how-determine-delta-t-free-surface-flow.html)

phsieh2005 September 14, 2005 11:52

How to determine delta t for free surface flow
 
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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