On 08/12/2018 12:30 AM, [email protected] wrote:

So I cannot make sure the continuity of the gradient in boundary or internal faces. But I don' know how to implement what I need? Maybe some penalty part like in Discontinuous Gradient Method to make up for continuity of the gradient?

Yes, that's what I would do -- add a penalty term for the discontinuity of the gradient across the periodic boundary.

Best
 W.

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Wolfgang Bangerth          email:                 [email protected]
                           www: http://www.math.colostate.edu/~bangerth/

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