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 August 7, 2009, 03:18 help with advection-diffusion equation #1 New Member   andrianomena Join Date: Mar 2009 Location: madagascar Posts: 23 Rep Power: 10 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.

 August 7, 2009, 11:15 #2 Senior Member   Antonio Martins Join Date: Mar 2009 Location: Porto, Porto, Portugal Posts: 112 Rep Power: 10 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

 August 8, 2009, 06:18 #3 Senior Member   Sandy Lee Join Date: Mar 2009 Posts: 213 Rep Power: 11 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.

 August 11, 2009, 05:54 #4 New Member   andrianomena Join Date: Mar 2009 Location: madagascar Posts: 23 Rep Power: 10 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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