Merge pull request #56 from su2code/update_fsi_python

Update fsi python

Author: Nicola-Fonzi

_tutorials/multiphysics/Unsteady_FSI_Python/Dynamic_FSI_Python.md

@@ -215,7 +215,7 @@ Available keywords for the config file:
 
 * __RESTART_SOL__ (string): YES or NO
 
-* __MOVING_MARKER__ (string): name for the interface marker
+* __MOVING_MARKER__ (string): numerical ID of the SET1 card indentifying the group of nodes to be used as interface
 
 * __IMPOSED_MODES__ (dictionary): In case of imposed motion this list contains the modes with imposed motion and the type of motion. Example: ```IMPOSED_MODES={0:["SINUSOIDAL"],3:["BLENDED_STEP"],4:["SINUSOIDAL"]}```. If more imposed motions have to be superposed on the same mode, we can write: ```IMPOSED_MODES={0:["SINUSOIDAL","BLENDED_STEP"]}```
 
@@ -317,10 +317,10 @@ $ python3 /your/path/to/fsi_computation.py -f fsi.cfg
 If you built you version of SU2 in parallel, run instead:
 
 ```
-$ mpirun -np X python3 /your/path/to/fsi_computation.py --parallel -f fsi.cfg
+$ mpirun -np X python3 -m mpi4py /your/path/to/fsi_computation.py --parallel -f fsi.cfg
 ```
 
-Substituting X with the appropriate number of cores.
+Substituting X with the appropriate number of cores. The ```-m``` flag set to ```mpi4py``` will instruct python to call ```MPI_Abort()``` in case of unhandled exceptions. In this way, you will avoid reaching deadlocks during execution.
 
 You will see, after the usual preprocessing steps, the following output: