As long as you save it to a PVD, the data will be stored at vertices, and not be properly discontinuous, you should use XDMFile.write_checkpoint, as shown in Loading xdmf data back in - #4 by dokken
As long as you save it to a PVD, the data will be stored at vertices, and not be properly discontinuous, you should use XDMFile.write_checkpoint, as shown in Loading xdmf data back in - #4 by dokken