Lito Yap
Ansys Employee

@nir.levanon,

Just request the number of nodes, number of tasks and CPUs per tasks on the cluster and run using the number of tasks you requested. 

Example LSF submission script:

!/bin/bash 
#BSUB -W 01:00              #1 hr wall time
#BSUB -n 64                 #64 processes/cores
#BSUB -R "span[ptile=4]"    #4 nodes
#BSUB -M 128000             #memory in MB =128gb
#BSUB -J lumtest            #job name=lumtest
#BSUB -e %J.err             #job error log file
#BSUB -o %J.out             #job output log file
#change directory to the location of your simulation files
cd /path_to/simulationfiles
#run 1 FDTD simulation using the bundled MPICH2 (default install path shown) using all requested resources
/opt/lumerical/v221/mpich2/nemesis/bin/mpiexec -n 64 /opt/lumerical/v221/bin/fdtd-engine-mpich2nem -t 1 simulationfile.fsp

Run your submission script on the cluster.