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-   -   Compressive term in gamma equation (http://www.cfd-online.com/Forums/openfoam-solving/60652-compressive-term-gamma-equation.html)

Ali (Ali) February 17, 2005 18:19

I was wondering what's the ac
 
I was wondering what's the actual and preferred expression for the compressive term in gamma equation and a very brief explanation of how it is derived. The formula for 'phir' in the code differs from what Henrik has mentioned in (Eq. (4.15)). In the code:

phir=cGamma()*mag(phi/mesh.magSf())*interface.nHatf()

while Henrik's suggests (if I have formulated it correctly):

phir=cGamma*nhatf*max(nhat * phi / mesh.magSf()**2 )

Are they really different (am I missing something) and if yes, which one is better?


2) where is the smoothing function for 'gamma' in interFoam? Does it have a significant effect on VOF performance or just affects surface tension prediction?

thanks


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