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-   -   help with advection-diffusion equation (http://www.cfd-online.com/Forums/openfoam-solving/67208-help-advection-diffusion-equation.html)

sambatra August 7, 2009 03:18

help with advection-diffusion equation
 
Hi there,
I'm solving an advection-diffusion equation(temperature equation) but it always crashes!!!
Is it possible to solve an advection-diffusion equation?How?
Can somebody out there help me please?
Best Regards.

titio August 7, 2009 11:15

Hi,

What are the boundary conditions, methods used, and other relevant information. Yiu have to give more information, otherwise I will not be able to help you.

Regards,

Titio

sandy August 8, 2009 06:18

Hi Titio, could you help me too? I want to simulate the true pressures in the domain but not some relative pressure values. What boundary conditions I should give. I gave a fixValue in inlet and a zerogradient in outlet, but the results are wrong. By the way, my problem is turbulence flows. Thanks a lot.

sambatra August 11, 2009 05:54

Hi
Sorry for the delay in replying,
In fact I'm modeling a porous media and through it a gas is circulating.The porous media is moving slowly(the gas flowing in cross-flow) that's why I have to take into account the advection term in the media temp equation,there is also a convective transfer between the media and the gas
When I implement the temperature equation of the media without source it's ok but when I couple it with the gas temperature it crashes.
boundaries are
for T:fixedGradient at the inlet,fixedValue at the outlet
for Tg:zerogradient at the outlet,fixedValue at the inlet
Information:the inlet is the inlet of the gas flow!
Thanks!


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