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species transport: amg divergence

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Old   September 1, 2007, 11:32
Default species transport: amg divergence
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I'm modeling species transport where there is air in a volume at the bottom, and then connected to this volume are a few different channels with helium at different temperature. I have put in a polynomial diffusion coefficient (T dependent) so I want to see how the air diffuses up given that the different channels are at different tempeartures. I'm using nita but after about 100 iterations I get divergence in the amg solver: species. Does anyone have any recommendations on how to avoid this? I lowered all my relaxations to around 0.4 thanks in advance

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