[petsc-users] petsc-3.5.2: ex12 with Neumann BC

[Olivier Bonnefon]

Hello,

I'm working on the snes/examples/tutorial/ex12 version 3.5.2.

I didn't succed to run the simplest case with Neumann BC:

./ex12 -run_type full -refinement_limit 0.0    -bc_type neumann 
-interpolate 1 -petscspace_order 1 -show_initial -dm_plex_print_fem 1 
-show_solution -bd_petscspace_order 1 -snes_linesearch_monitor 
-snes_monitor -ksp_monitor_true_residual -snes_converged_reason 
-ksp_converged_reason

This leads to dofs negatives values.

Do you know the options to get a correct result with Neumann BC ?

Regards,
Olivier Bonnefon