On 8/26/22 06:42, [email protected] wrote:
I solve Laplacian problem with
"-0.5*std::exp(-2.0*0.963740544195800*p(0))" as exact solution, I apply
Neumaan bc on all 4 boundaries.
As someone noted earlier in this thread, the Laplace problem with *only*
Neumann boundary conditions does not have a unique solution: If u(x,y)
is a solution, then u(x,y)+c is also a solution for any constant c. You
shouldn't expect the solver to provide you with a solution.
Best
W.
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Wolfgang Bangerth email: [email protected]
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