# Mistake in PISO loop for interFoam solver

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 June 27, 2006, 21:04 Hello Friends I was wonderi #1 Senior Member   kumar Join Date: Mar 2009 Posts: 112 Rep Power: 10 Hello Friends I was wondering if there is a mistake in the PISO loop for the interFoam , rasInterFoam solvers. In Dr. Rusche's PHD page 148, (Del.V) = 0 , but at the interface density is rapidly changing so shouln't (Del.(rho*V)= 0); Looking at the PISO loop in rasInterFoam we have laplacian(rUAf,pd)==div(phi) . should this be changed to something like laplacian(rUAF*rho,pd) == div(phi*rho) Thanks a lot in advance Kumar

 June 28, 2006, 12:57 Dear Friends Could someone #2 Senior Member   kumar Join Date: Mar 2009 Posts: 112 Rep Power: 10 Dear Friends Could someone comment on this post ? thanks kumar

 June 28, 2006, 13:09 No, because the interFoam solv #3 Senior Member   Eugene de Villiers Join Date: Mar 2009 Posts: 725 Rep Power: 14 No, because the interFoam solver conserves volume not mass (both fluid are assumed incompressible). This is done specifically to get around the problem of large gradients at the interface.

 June 30, 2006, 18:26 Hi Eugene Thanks a lot for #4 Senior Member   kumar Join Date: Mar 2009 Posts: 112 Rep Power: 10 Hi Eugene Thanks a lot for your reply. I have just one more question. In equation of 4.28 of henrik rusche's phd thesis we have phi=phi* - (1/A_D)_face * |S|*faceGradient(P) But in 4.30 we have something like div( (1/A_D)_face , gradient(P) ] = diver.(phi*) How is |S|*faceGradient(P) converted to gradient(P) ?? In all openfoam solvers the equation 4.30 is implemented and they are dimensionally correct. Another question if rUA = 1.0/UEqn.A() is rUAf = rUA interpolated on the face and multiplied with surface area or it is just rUA interpolated to the faces Thanks a lot once again Kumar

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