Compressibility on multiphase flow on CFX 11

Bayard Morales

Hi there.

Just a theoretical question:

in CFX 11 manual, when describing the momentum conservation for single phase flows, the term of shear stresses has three terms, being the last relative to the velocity divergence.

When it goes to inhomogeneous multiphase flow, this last term just vanishes.

I apologize if I am being just dumb, but what is the reason?

This term could vanish in incompressible flow, but I could not find where the manual explain what are the hypotesis used.

Thanks.