dolfinx.fem.DirichletBCMetaClass doesn't work

dolfinx
1

Hi everyone!
A few months ago I had this code to deform a mesh from changes in the boundary

from typing import List
def deform_mesh(V, bcs: List[dolfinx.fem.DirichletBCMetaClass]):
    mesh = V.mesh
    uh = dolfinx.fem.Function(V)
    dolfinx.fem.petsc.set_bc(uh.vector, bcs)
    u = ufl.TrialFunction(V)
    v = ufl.TestFunction(V)
    a = ufl.inner(ufl.grad(u), ufl.grad(v))*ufl.dx
    L = ufl.inner(dolfinx.fem.Constant(mesh, (0., 0.)), v)*ufl.dx
    problem = dolfinx.fem.petsc.LinearProblem(a, L, bcs, uh)
    problem.solve()
    deformation_array = uh.x.array.reshape((-1, mesh.geometry.dim))
    mesh.geometry.x[:, :mesh.geometry.dim] += deformation_array
    
c_el = mesh.ufl_domain().ufl_coordinate_element()
V = dolfinx.fem.FunctionSpace(mesh, c_el)

mesh.topology.create_connectivity(mesh.topology.dim-1, mesh.topology.dim)
all_facets = dolfinx.mesh.exterior_facet_indices(mesh.topology)
top_facets = dolfinx.mesh.locate_entities_boundary(
    mesh, mesh.topology.dim-1, walls)


bc_fixed_facets = []
for facet in all_facets:
    if facet not in top_facets:
        bc_fixed_facets.append(facet)

fixed_dofs = dolfinx.fem.locate_dofs_topological(
    V, mesh.topology.dim-1, bc_fixed_facets)
c = dolfinx.fem.Constant(mesh, (0., 0.))
bc_fixed = dolfinx.fem.dirichletbc(c, fixed_dofs, V)

, but now I get the following error.

module 'dolfinx.fem' has no attribute 'DirichletBCMetaClass'

Does anyone know how I can update it?

Thank you very much

2

See: Remove Python 'meta classes' by garth-wells · Pull Request #2683 · FEniCS/dolfinx · GitHub
In particular: Remove Python 'meta classes' by garth-wells · Pull Request #2683 · FEniCS/dolfinx · GitHub

1 Like