Fluent FAQ

Environment Initialization

For k2 and cosmos, you will need to run the following command to initialize your environment for Fluent.

module load fluent

On agave, you will need to run one of the following commands depending on your login shell to initialize your environment

source /usr/local/Fluent.Inc/fluent.login # for csh/tcsh shells . /usr/local/Fluent.Inc/fluent.profile # for bash/sh/ksh shells

The command 'fluent' will run the latest version available (6.3 as of 4/2007) by default.

Using Specific Versions of Fluent and Gambit

Below shows how to list the available versions of Fluent and Gambit:

cosmos% fluent -r /usr/local/Fluent.Inc/fluent6.3.26/bin/fluent -r6.3.26 -r The releases available in /usr/local/Fluent.Inc area are: 6.3.26 6.2.16 cosmos% gambit -r The releases available in /usr/local/Fluent.Inc area are: 2.3.16 2.2.30

The example below shows how to choose version 6.2.16 for Fluent:

cosmos% fluent -r6.2.16

Advanced Fluent Problems

The SC staff has limited experience with Fluent and Gambit. Due to certain restrictions, students may not be able to use the official Fluent support forums. However, the following Fluent forums may be useful for addressing your issues:

• University Fluent Forum
• Fluent User Forum at CFD Online

Known Problems and Solutions for running Fluent on cosmos

Using Fluent MPI in PBS jobs

You must use the -paltix (Fluent 6.3) or -psgimpi (earlier versions) flag when running Fluent with MPI in PBS batch jobs. Failure to use this flag may result in unintentional interaction between multiple simultaneously running batch jobs that are running Fluent MPI.

fluent 3d -t4 -paltix -g < inputfile # Fluent 6.3 fluent 3d -t4 -psgimpi -g < inputfile # Earlier Fluent versions

Known Problems and Solutions for running Fluent on agave

Required Command for Serial Fluent Jobs

You must include the following command in your LSF batch job scripts in order for Fluent to run correctly on agave:

ulimit -n 2000              # for ksh
limit descriptors 2000      # for tcsh

Batch jobs using Fluent with MPI

Fluent MPI jobs should be submitted only to the normal queues. Also, a proper host list file is need for running Fluent MPI. See this page in the agave user guide for more information.