Hi everyone, As a very beginner of fenics, i need someone to help me for this problerm : While i solve an equation in this mesh using Neumann boundary condition. Now i want to get the Function value in some points or the mesh boundary This is a simple example: from fenics import * import nump…

Thank you so much for giving me the example. May I ask you one more favor, if don’t mind? I want to know how to get the boundary points from a mesh.

What do you imply by boundary points? Do you mean those vertices that are part of a facet that is on the boundary?

Thanks for your kind help . I want to rewrite my problem as flows: from fenics import * from mshr import * mesh1 = UnitSquareMesh(2, 2) domain = Rectangle(Point(0, 0), Point(1, 1)) mesh2 = generate_mesh(domain, 30) We can get mesh1 and mesh2 by running this code .How to get the (left) boundary …

You can call the following: # Find the facets that are marked with 1 facet_indices = np.flatnonzero(bmf.array() == 1) # Create facet to vertex connectivity mesh.init(mesh.topology().dim()-1, 0) # Get mesh nodes coords = mesh.coordinates() # Get facet to vertex connectivity f_to_c = mesh.topology…

How to get the Function value on some points or the mesh boundary?

dolfin-adjoint

dokken April 17, 2023, 2:53pm 2

See: How to get nemrical solution value for a given point? - #2 by dokken

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How to get the Function value on some points or the mesh boundary?

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