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How do Comsol handles variable density?

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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


1 Reply Last Post Mar 17, 2010, 12:15 p.m. EDT

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Posted: 1 decade ago Mar 17, 2010, 12:15 p.m. EDT
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
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

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