Hello all, I am solving a simple elasticity problem using dolfinx and I am trying to fix one side of a beam and let it deflect under its weight. I am trying the use the “V.sub(2).collapse()[0]” for that. There is no error, but it is not working for some reasons. it shows no deformation at all. […

Hi, Thank you so much for the reply. I solved the problem, but my over all goal is to transform a working code in fenics to fenicsx(0.6.0). The problem is that I don’t get any error in fenicsx but the results is not correct. Actually, the results is zero all over the domain. Since there is no er…

Your code is far from a minimal working example, and requires a lot of time for people to familiarize themself with. What I would start with is to check that all boundary conditions are set correctly, then next up check that all subdomains (that being facets or cell tags) are marked correctly. I w…

Thank you so much and I appreciate your time. I worked on it and by changing the solver from solver = PETSc.KSP().create(mesh.comm) solver.setOperators(A) solver.setType(PETSc.KSP.Type.PREONLY) solver.getPC().setType(PETSc.PC.Type.LU) TO ksp = PETSc.KSP().create(mesh.comm) ksp.setOperators(A) ksp…

Thank you so much @dokken for your comments. After checking my code, I solved the issue by modifying the solver as problem = LinearProblem(a, L, bcs=bc, petsc_options={"ksp_type": "preonly", "pc_type": "lu", "pc_factor_mat_solver_type": "mumps"}) Result = problem.solve() H…

See KSP: Linear System Solvers — PETSc v3.19.5-1107-g8cfeadfb465 documentation and each individual solver’s documentation.

How to applying BC using V..sub().collapse() in dolfinx

dolfinx

dokken August 25, 2023, 7:24am 2

See for instance Component Wise Dirichlet BC - #2 by dokken or Component-wise Dirichlet BC — FEniCSx tutorial

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How to applying BC using V..sub().collapse() in dolfinx

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