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-   -   Porosity and buoyancy (https://www.cfd-online.com/Forums/cfx/22620-porosity-buoyancy.html)

Guillaume May 29, 2006 20:29

Porosity and buoyancy
 
hey,

Does anyone knows how to use buoyancy on a porous medium in CFX? Because, as soon as I add an isotropic loss model with a resistance loss coefficient, I get a big pressure jump on the interface porous-fluid... the pressure goes up to 40000Pa on the interface, whereas it's between 0 and 300Pa on the rest of the domain (which is in agreement with my boundary conditions).

I tried to set the medium as non porous and I had no such dicontinuity. I also tried to put it porous but non buoyant, and I didn't have any discontinuity either. But when both are involved....

Does anyone has a solution? Can I set buoyancy in some domain only (the non porous ones) and not in others?

Thanks,

Guillaume

Donald June 3, 2006 15:31

Re: Porosity and buoyancy
 
You need to switch to fleutn for this I think

Phil June 5, 2006 10:22

Re: Porosity and buoyancy
 
There is a bug when plotting hybrid pressure on porous interfaces in CFX... look only at 'conservative' pressures... hopefully the solution itself is ok... otherwise contact your support group.

Robin June 5, 2006 11:51

Re: Porosity and buoyancy
 
Thanks Donald. Very helpful and full of insight :)


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