Re: How do Comsol handles variable density?

Wed, 17 Mar 2010 15:15:11 +0000

Oh, I got it.

There is a Weakly Compressible Navier-Stokes for Heat Module. My calculation with the Navier-Stokes is not correct.
The Weakly Compressible Navier-Stokes uses drho/dt+div rho u = 0 instead of div u=0

How do Comsol handles variable density?

Wed, 17 Mar 2010 14:20:09 +0000

I'm modelling the refrigeration of a liquid, which properties are dependent of the Temperature. One of them ist the density. Therefore the liquid may lose volume as it cools down. Which I understand as a form of compression.

As navier-stokes can only be used by incompressible fluids, I was predicting a error in the solution (about 20%).

The fact is, the solution was not that bad (error about 5%). Can COMSOL compesate this kind of compression?

thanks

COMSOL Forums: How do Comsol handles variable density?

Re: How do Comsol handles variable density?

How do Comsol handles variable density?