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-   -   Pressure Poisson Equation: is NASA-VOF2D or RIPPLE correct? (http://www.cfd-online.com/Forums/main/82916-pressure-poisson-equation-nasa-vof2d-ripple-correct.html)

James December 9, 2010 01:26

Pressure Poisson Equation: is NASA-VOF2D or RIPPLE correct?
 
Hi everyone,

In NASA-VOF2D, the Pressure Poisson Equation is given by:
(dt/rho) div(grad(p(n+1))) = div(u_tilde)
Here rho is treated as constant.

In RIPPLE, the Pressure Poisson Equation takes the form of:
div(grad(p(n+1))/rho) = div(u_tilde)/dt
Here the variation of density in the free surface region is considered. So which formulation is correct (or better)? Thanks!

James


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