[mahsankhan]

Dear Users,

Can someone please help with how to get the density in ParaView?
I am using interMixingFoam solver of OpenFOAM, and the parameters I get after the run are p, p_rgh, U, alpha.water, alpha.air, alpha.other, nut, nuTilda... but there is no rho for the density...

I want to have a density profile since my density in the domain changes as two fluids mix together. Can I get it somehow? Is there a way to achieve that?

I tried to use the calculator filter with (p-p_rgh)/(9.81*coordsZ) but this gives huge values at the bottom of the domain, probably due to a "zero" in the denominator... can someone please help me with this issue...?

Thanks a lot in advance

Have a good day!!!

[jherb]

You should be able to write rho with a writeObjects function object: https://www.openfoam.com/documentati...teObjects.html

[mahsankhan]

Originally Posted by jherb

You should be able to write rho with a writeObjects function object: https://www.openfoam.com/documentati...teObjects.html

Thank you for your reply.
However, what you suggested would need the simulation to start over again. There exist another option:
Once you have run the OpenFOAM simulation, just open it in ParaView and apply the calculator filter like this (-p+p_rgh)/(9.81*(CoordZ)) and this will give you the density for the whole domain.

[Tobermory]

Originally Posted by mahsankhan

Thank you for your reply.
However, what you suggested would need the simulation to start over again.

No - you misunderstood jherb - just run the solver with the -postProcess flag and the writeObjects func, and it will spit out the field for you without running any more of the simulation. Eg.:

someFoamSolver -postProcess -latestTime -func "writeObjects(h, rho)"