@Raymond_Yu - let’s try this. The patch below changes all of the places where the .pvd file is opened to specify READWRITE.
You can use the patch utility to apply this, or else just edit the two files cartesian_grid/pvd_mod.f and des/vtp_mod.f directly to add the ACTION='READWRITE' parameter:
patch.txt (3.6 KB)
After this, rebuild the solver and run your problem case, maybe we’ll get a clue what’s going wrong.
– Charles