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2nd order zeroGradient BC

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Old   August 3, 2017, 19:12
Default 2nd order zeroGradient BC
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Hello all,

BC.png

In my sketch, A is the value of the boundary face center, B is the value of the boundary cell center and C is the value of the center of the opposite face.

As far as I know, zeroGradient BC is 1st order, A=B.

My Question is how to apply a 2nd-order zeroGradient BC, which means 3A=4B-C (Or something else if not uniform) ?

Thanks.
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boundary condition, second order, zerogradient

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