Running Fluent

Running Fluent on ARCHIE-WeSt

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This is a simple example of Fluent which should run on ARCHIE-WeSt and take few minutes. The input files and job script are downloadable below.
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1. Prepare input files

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The following files are required to be present in the working directory (input files):

  • fluent_input.txt
  • valve_real_10_deg.cas
  • job script fluent_multiway.sh

These can be downloaded as a tar file from here.
The sample input file (fluent_input.txt):

  
rc valve_real_10_deg.cas
solve/init/init
solve/it/100
wc valve_real_10_deg.cas
yes
wd valve_real_10_deg.dat
yes
exit
yes

 
The job script (fluent-slurm-singlenode-exclusive.sh) will use 40 cores:

  
#!/bin/bash
#======================================================
# Job script for running Fluent on a single node
#======================================================
# Propogate environment variables to the compute node
#SBATCH --export=ALL
# Run in the Parallel queue
#SBATCH --partition=standard
# Specify project account
#SBATCH --account=testing
# No. of tasks required (max. of 40)
#SBATCH --ntasks=40
# Ensure the node is not shared with another job
#SBATCH --exclusive
# Specify (hard) runtime (HH:MM:SS)
#SBATCH --time=00:10:00
# Job name
#SBATCH --job-name=fluent_test
# Output file
#SBATCH --output=slurm-%j.out
#======================================================
module purge
module load ansys/18.1
#======================================================
# Prologue script to record job details
# Do not change the line below
#======================================================
/opt/software/scripts/job_prologue.sh
#------------------------------------------------------
#srun hostname -s > hosts.$SLURM_JOB_ID
#Initiating Fluent and reading input journal file
fluent 3d -ssh -slurm -t$SLURM_NTASKS -g -i example_1_fluent_input.txt
#======================================================
# Epilogue script to record job endtime and runtime
# Do not change the line below
#======================================================
/opt/software/scripts/job_epilogue.sh
#------------------------------------------------------
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3. Job submission

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To submit the job, type:

sbatch fluent-slurm-singlenode-exclusive.sh
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As a result, the following files will be produced (output files):

  • valve_real_10_deg.cas (N.B. this over-writes the original)
  • valve_real_10_deg.dat
  • out.$jobID$

The output files can be downloaded as a tar file from here for comparison.