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Making a change in Mass Conservartion Equation!

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Old   April 25, 2007, 03:38
Default Making a change in Mass Conservartion Equation!
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Hi! I want to make a change in mass conservation equation. I want to change Ji (Ji = D*rho*grad(Yi)) to Ji = (u*E + D*grad(rho*Yi) ) How I can do it? If I want do it by DEFINE_SOURCE I must calculate gradian and laplacian!!! Is there exist easier way? Thanks!
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