Hi, I created a a couple of physical groups within GMSH with appropriate labels/tags. I then tried to use the same labels after importing the .msh file in firedrake. I got the following error: Please find below the relevant section in the .py file that generates the gmsh mesh and saves it in .msh file gmsh.option.setNumber("Mesh.MshFileVersion", 2) # Physical curves defined with appropriate tags starting from 1000 gmsh.model.addPhysicalGroup(1, b_o_c_arcs,1001) gmsh.model.addPhysicalGroup(1, b_i_c_arcs,1002) gmsh.model.addPhysicalGroup(1, list(t_o_c_arcs),1003) gmsh.model.addPhysicalGroup(1, list(t_i_c_arcs),1004) # Physical surfaces defined with appropriate tags starting from 2000 gmsh.model.addPhysicalGroup(2, circ_pl_surf,2001) gmsh.model.addPhysicalGroup(2, extsurfs,2002) # Physical volumes defined with appropriate tags starting from 3000 gmsh.model.addPhysicalGroup(3, voltags,3001) gmsh.model.mesh.generate(3) gmsh.write("Pipe3D.msh") Here is the snippet of the .py file executed within firedrake: mesh=Mesh('Pipe3D.msh') bc1=DirichletBC(V,zero,1003) When I execute the solve command I get this error: Error: {1003} are not a valid markers (not in {2001,2002}) I think I have a workaround that is not yet giving me errors wherein I define a class derived from DirichletBC and redefine the @utils.cached_property nodes function. However, It would be great if I could do it using the existing DirichletBC class. I would be very grateful if you could help me out here. Thanks -- Abhishek Venketeswaran NETL Research Associate - ORISE National Energy Technology Laboratory Department of Energy abhishek.venketeswaran@netl.doe.gov Work: 412-386-4833 Mobile: 716-507-7890 www.netl.doe.gov<http://www.netl.doe.gov> [cid:0311bcdf-830c-456c-a671-ff3e827d18f2]
