See Transitioning from mesh.xml to mesh.xdmf, from dolfin-convert to meshio to use a gmsh mesh in dolfin (without requiring dolfinx at all). You may want to start reading it from the bottom, since there have been many replies.
See Transitioning from mesh.xml to mesh.xdmf, from dolfin-convert to meshio to use a gmsh mesh in dolfin (without requiring dolfinx at all). You may want to start reading it from the bottom, since there have been many replies.