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

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Old   December 9, 2010, 01:26
Question Pressure Poisson Equation: is NASA-VOF2D or RIPPLE correct?
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James Zhong
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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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