Hello,
In one porous flow simulation, I get this message:
Newton iteration 6 done, residual = 3.1654e+13
Solve: M deltax^k = rNewton: Caught exception: "FMatrixError
[luDecomposition:/home/dpavlov/DUMUX/dune-common/dune/common/densematrix.hh:939]:
matrix is singular"
... and it is fine. Matrix can be singular, no objection here. After
this, the Newton solver reports that it did not converge and restarts
with a smaller time step, and eventually it proceeds.
However, when I run the same simulation with MPI, I get this
Newton iteration 8 done, residual = 7.2437e+13
Solve: M deltax^k =
and the program hangs.
So it seems that it misses the singularity in the MPI mode and tries to
proceed with the current time step, to no avail.
How this can be cured?
Best regards,
Dmitry
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