I find when I run it with 2 or more processors(ff-mpirun -n 2 try_movemesh.edp -wg -v 0
), it can work well.
However, when I choose only one processor(ff-mpirun -n 1 try_movemesh.edp -wg -v 0
), it report an error as
I think you should set penal=-1.e-8 in order to prevent having a singular matrix (pressure not unique because of addition of a constant). When there are several processes the linear system is solved by approximations that eventually do not “see” that the matrix is singular.
