Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
How do Comsol handles variable density?
Posted Mar 17, 2010, 11:20 a.m. EDT 1 Reply
Please login with a confirmed email address before reporting spam
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
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
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
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
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