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Mathematical eq. for symmetric boundary

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Old   February 11, 2008, 14:27
Default Mathematical eq. for symmetric boundary
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Hi all!

I am writing a small code to solve the laplacian equation over a 2D domain with a symmetry plane. The thing is that I am not sure what is the equation that holds for these nodes.

I thought and probably is right that the equation is:

du/dn = 0 ( homogeneus von Neumann BC).

is it right?

Thanks in advance
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