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<span>Dear all:<br>
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<div>This is the first time I am using getdp. I am trying to solve a Laplace problem with mixed boundary conditions in a cylinder. The equations are:<br>
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<div>- Laplacian N = 0 inside the cylinder.<br>
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<div>N = 0 on the side of the cylinder.<br>
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<div>grad N * normal[] = - CompX[Normal[]] on the bases of the cylinder.<br>
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<div>I have my .geo and .pro files, but when getdp computes the solution the Neumann condition is not fulfilled. I checked the normal vectors with the gui of gmsh and the postprocesing of getdp and they looked good. I tried with different ways of define my
geometry but it gives me the same results.<br>
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<div>I put the Dirichlet condition as a constraint and the weak formulation is:<br>
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<div>[Dof{d N} ,{d N} ]_inside the cylinder<br>
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<div>+ [CompX[Normal[]] ,{N} ]_on the bases of the cylinder.<br>
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<div>I am using getdp-3.2.0 and gmsh-4.4.1 for Windows64. I also tried with the version from the 1st of October of 2019 of ONELAB.<br>
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<div>I can't find what is wrong, I would be thankful if someone can help me. I attached the .geo and .pro files.<br>
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<div>Thank you in advance.<br>
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<div>Isabel.<br>
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