[cfdfans]

Dear Foamer,
I am a beginner in interFoam of OpenFoam. I wonder if there are someone could show me how the momentum equation of interFoam in version 1.6.x is demonstrated below:

ddt(rho,U) + div(rhophi,U) = grad(P) + rho*g + fv + laplace(mueff,U)

inwhich:
fv : surface tension force
rho = alpha1*rho1+(1-alpha1)*rho2
U = alpha1*U1+(1-alpha1)*U
rhophi = rho*U + alpha1*(1-alpha1)*(rho1-rho2)*(U1-U2)

I tried from two equations of each phase, but I am not successful.

Thanks a lot.

Milou