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ansys

Versions and Availability

About the Software

Description Path: key[@id="ansys"]/whatis Not Found!

Usage

Set up your environment to run ANSYS Fluent

To run ANSYS Fluent, you need to set up your environment properly, which entails two steps:

  1. Add the corresponding softenv key to your .soft file and resoft: you can use the "softenv -k ansys" command to find out what the key is;
  2. Set the license preference: this can be down by running the anslic_admin command and then select "Set license preferences for User xxx" -> "version number xx.x" -> "Use Academic Licenses" in the pop-up window.

Sample script

 #!/bin/bash
 #PBS -A your_allocation
 #PBS -q checkpt
 #PBS -l nodes=1:ppn=16
 #PBS -l walltime=12:00:00
 #PBS -V
 #PBS -j oe
 #PBS -N fluent_test

    fluent -v3ddp -g -t16 << EOFluentInput > output.dat
     file/read-case Innerwall.cas
     parallel/partition/auto/use-case-file-method yes
     parallel/partition/print
     solve/initialize/initialize-flow
     solve/iterate 50
     file/write-data Innerwall_2.dat
     file/auto-save/data-10
     file/auto-save/overwrite-existing-files
     file/confirm-overwrite y
     exit
     yes
     EOFluentInput

The script is then submitted using qsub:

$ qsub job_script

where job_script is the name you gave the script file.

For a list of available command line options, use 

$ fluent -help

▶ QSub FAQ?

Portable Batch System: qsub

qsub

All HPC@LSU clusters use the Portable Batch System (PBS) for production processing. Jobs are submitted to PBS using the qsub command. A PBS job file is basically a shell script which also contains directives for PBS.

Usage
$ qsub job_script

Where job_script is the name of the file containing the script.

PBS Directives

PBS directives take the form:

#PBS -X value

Where X is one of many single letter options, and value is the desired setting. All PBS directives must appear before any active shell statement.

Example Job Script
 #!/bin/bash
 #
 # Use "workq" as the job queue, and specify the allocation code.
 #
 #PBS -q workq
 #PBS -A your_allocation_code
 # 
 # Assuming you want to run 16 processes, and each node supports 4 processes, 
 # you need to ask for a total of 4 nodes. The number of processes per node 
 # will vary from machine to machine, so double-check that your have the right 
 # values before submitting the job.
 #
 #PBS -l nodes=4:ppn=4
 # 
 # Set the maximum wall-clock time. In this case, 10 minutes.
 #
 #PBS -l walltime=00:10:00
 # 
 # Specify the name of a file which will receive all standard output,
 # and merge standard error with standard output.
 #
 #PBS -o /scratch/myName/parallel/output
 #PBS -j oe
 # 
 # Give the job a name so it can be easily tracked with qstat.
 #
 #PBS -N MyParJob
 #
 # That is it for PBS instructions. The rest of the file is a shell script.
 # 
 # PLEASE ADOPT THE EXECUTION SCHEME USED HERE IN YOUR OWN PBS SCRIPTS:
 #
 #   1. Copy the necessary files from your home directory to your scratch directory.
 #   2. Execute in your scratch directory.
 #   3. Copy any necessary files back to your home directory.

 # Let's mark the time things get started.

 date

 # Set some handy environment variables.

 export HOME_DIR=/home/$USER/parallel
 export WORK_DIR=/scratch/myName/parallel
 
 # Set a variable that will be used to tell MPI how many processes will be run.
 # This makes sure MPI gets the same information provided to PBS above.

 export NPROCS=`wc -l $PBS_NODEFILE |gawk '//{print $1}'`

 # Copy the files, jump to WORK_DIR, and execute! The program is named "hydro".

 cp $HOME_DIR/hydro $WORK_DIR
 cd $WORK_DIR
 mpirun -machinefile $PBS_NODEFILE -np $NPROCS $WORK_DIR/hydro

 # Mark the time processing ends.

 date
 
 # And we're out'a here!

 exit 0

Resources

ANSYS user documentation can only be accessed via the password protected customer portal. If you have an account, you can access it here.

ANSYS is adding support for accelerators, such as GPU's. A white paper is available which shows the performance gains possible.

Last modified: September 10 2020 11:58:50.