High Performance Computing Center

INTRODUCTION
APPLICATION SOFTWARE
PUBLICATIONS
NEWS
LINKS
John Matrow  [Remove spaces from John . Matrow @ wichita . edu] (bio) located at 011 Jabara Hall.
FLUENT

Introduction to Fluent (ppt download)

Fluent Tutorial

MAKE SURE /apps/Fluent.Inc/bin IS IN YOUR $PATH
MAKE SURE
setenv LM_LICENSE_FILE '7241@cronus' IS IN YOUR .cshrc

NOTE CHANGE FROM –pnmpi TO -pethernet

To break jobs into 48 CPU hour chunks:
1) Determine the number of seconds per iteration
2) Divide 172800 by that number and round down for number of iterations in 48 hours
3) Use the autosave feature. See section 3.3.4 of the user's guide
4) Use qsub -W depend=after:<JobID> on the second job where <JobID> is the Job ID of the first job.

Parallel Operation

It is extremely important to determine if your problem will benefit from additional processors (cpu's). Run your problem for a few iterations with 1 processor. Repeat for 2 and then 4 processors. If you do not get a corresponding speedup then your problem may be too small to scale well. If so, do not add additional processors because it may actually slow down your job performance.

notus example

Replace X and Y where X is the number of processors and Y is X divided by 2
(Note: Same as apollo/artemis script except for two bold parts)

#!/bin/csh
#PBS -q para -l nodes=
Y:notusall:ppn=2
setenv LM_LICENSE_FILE "7241@cronus-b"
cd ~/fueltank
fluent 3ddp -tX -pethernet -ssh -cnf=$PBS_NODEFILE -g -i fluent.script > & junk.outoutout
 

zeus example

Replace X where X is the number of processors

#!/bin/csh
#PBS -q para -l nodes=zeus -l ncpus=
X
setenv LM_LICENSE_FILE "7241@cronus-b"
cd ~/fueltank
fluent 3ddp -tX -pethernet -g -i fluent.script > & junk.outoutout
 

apollo/artemis example

Replace X and Y where X is the number of processors and Y is X divided by 2

#!/bin/csh
#PBS -q para -l nodes=
Y:ia32:ppn=2
setenv LM_LICENSE_FILE "7241@cronus-b"
cd ~/fueltank
fluent 3ddp -tX -pethernet -cnf=$PBS_NODEFILE -g -i fluent.script > & junk.outoutout

 

Where fluent.script contains:

file rc Tank3D.cas
solve init init
solve it 2
wd Tank3D.dat
yes
exit
yes

For technical assistance, email aca-support@fluent.com