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Flux Boundary Conditions

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Old   January 31, 2011, 18:09
Exclamation Flux Boundary Conditions
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Kelvin
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I want to set boundary conditions at the wall of C variable. The boundary conditions is flux = 0, which is given as

-K*grad(C)-C*grad(Phi) = 0 (K: constant)

how can I define flux boundary conditions?

Can anyone help me for this situation...

Thanks
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