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How to specify the neumann wall boundary condition

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Old   April 9, 2008, 18:33
Default How to specify the neumann wall boundary condition
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Instead of using c=0 at wall in mass transport model, (c reprents mass concentration), how to specify the wall boundary condition \partial c/\partial y + Ky=0 (such as air-mucus layer y=0) K is dimensionless parameter.

Thanks alot
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