Hi, everyone! I want to apply a force on a specify node of the mesh in only one direction (e.g x-direction) in linear elasticity problem. How should I do this?

I figured out what the mistake was. The degrees-of-freedom of the point I want to find through “rd = dolfinx.fem.locate_dofs_geometrical(V=V, marker=lambda x: np.isclose(x[0], 2.0) & np.isclose(x[1], 0.0))” is actually The global index of the node. So if I want to apply a x-direction force on the no…

Thank you Mr. ballarin. for your suggestion. I apologize for the post question. I’ll search the forum to make sure no the same posting before posting. :pray:

rd = dolfinx.fem.locate_dofs_geometrical(V=V, marker=lambda x: np.isclose(x[0], 2.0) & np.isclose(x[1], 0.0)) # create compiled form a_compiled = dolfinx.fem.form(a) L_compiled = dolfinx.fem.form(L) # Define a linear variational solver ksp_type = getattr(petsc4py.PETSc.KSP.Type, "PREONLY") pc_type =…

Please add a minimal reproducible example, as it is hard to Give any guidance from the snippet you have produced

How to apply a pointwise force using dolfinx

dolfinx

francesco-ballarin April 17, 2024, 8:03am 2

Please use the search button before posting. The question has been asked several times in this forum, and one possible solution is Point Sources (Redux) - #6 by dokken

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How to apply a pointwise force using dolfinx

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