Component Wise Dirichlet BC

dokken · April 3, 2023, 12:22pm

You would need to add a complete minimal working example that reproduces your error for anyone to be able to help you.
See for instance:
https://jsdokken.com/dolfinx-tutorial/chapter3/component_bc.html#boundary-conditions
and

github.com

FEniCS/dolfinx/blob/main/python/test/unit/fem/test_bcs.py#L209-L234


      
          def test_sub_constant_bc(mesh_factory):
              """Test that setting a dirichletbc with on a component of a vector
              valued function yields the same result as setting it with a
              function"""
              func, args = mesh_factory
              mesh = func(*args)
              tdim = mesh.topology.dim
              V = VectorFunctionSpace(mesh, ("Lagrange", 1))
              c = Constant(mesh, PETSc.ScalarType(3.14))
              boundary_facets = locate_entities_boundary(mesh, tdim - 1, lambda x: np.ones(x.shape[1], dtype=bool))
          
          
    for i in range(V.num_sub_spaces):
                  Vi = V.sub(i).collapse()[0]
                  u_bci = Function(Vi)
                  u_bci.x.array[:] = PETSc.ScalarType(c.value)
          
          
        boundary_dofsi = locate_dofs_topological((V.sub(i), Vi), tdim - 1, boundary_facets)
                  bc_fi = dirichletbc(u_bci, boundary_dofsi, V.sub(i))
                  boundary_dofs = locate_dofs_topological(V.sub(i), tdim - 1, boundary_facets)
                  bc_c = dirichletbc(c, boundary_dofs, V.sub(i))

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Component Wise Dirichlet BC

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