CFD Online Discussion Forums - Notes for OpenFOAM!

In this blog, quick reference notes about OpenFOAM are posted in a form of a summary to address a specific topic per post, which I think could be helpful as a reminder for my Alzheimer condition

OpenFOAM Installation for Multiple Users

Posted March 9, 2013 at 08:26 by Hisham (Notes for OpenFOAM!)
Updated March 10, 2013 at 10:47 by Hisham

Tags install, multiple users, openfoam

If OpenFOAM was installed on a single user account using the OpenCFD binaries then for another user to have access to it is very simple. All one needs to do is to add an alias of the installation in the new user's .bashrc file

Code:

OFver='source /opt/openfoamver/etc/bashrc'

If, on the other hand, OpenFOAM (or OpenFOAM-ext) was compiled on a user account (say the user name is MrX) and a new user (MrY) wants to use the same installation, then:

1. MrX must make sure...

Hisham

Senior Member

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Floating Point Math in Bash

Posted March 6, 2013 at 13:35 by Hisham (Notes for OpenFOAM!)

Tags bash, floating point numbers

This post is copied from: http://www.linuxjournal.com/content/...oint-math-bash
Floating Point Math in Bash, By Mitch Frazier

To use floating point arithmetic in Bash one can source this script (i.e. source floatSupport.sh). The floatSupport.sh is:

Code:

#!/bin/bash 
# 
# Floating point number functions. 

##################################################################### 
# Default scale used by float functions.

...

Hisham

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Gmsh Functions 1

Posted January 21, 2013 at 06:18 by Hisham (Notes for OpenFOAM!)

Tags gmsh

Gmsh is a powerful mesh generator. One of its strength points is the use of both scripting and GUI functionality. Scripting has two neat features: Function : lets one define a function and call it several times. Include : lets one include other scripts into the geometry file script.

Assume we have a Mesh.geo file that we have for the geometry. You can start off by:

Code:

Include "Functions.geo" ;

The Functions.geo file is a file that has some function...

Hisham

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Processor Affinity to Enhance Speed

Posted September 11, 2012 at 11:09 by Hisham (Notes for OpenFOAM!)
Updated September 12, 2012 at 10:02 by Hisham

To enhance the speed of running a solver one can use a "hard" assignment of the job to a specific core. This reduces the work needed to switch jobs between cores and enhances the speed. It is really neat if you need to do some other work on the workstation while the run is going on in the background.

Install:

Code:

# apt-get install schedtool

Use:

Code:

$ schedtool -a 5 10640

This command assigns job 10640...

Hisham

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Gnuplot Vector Probes from the funtionObject

Posted June 9, 2012 at 15:27 by Hisham (Notes for OpenFOAM!)

When using the functionObject to probe a vector (e.g. velocity) at a location, the output is in the format:

Code:

# Time  vector
1.20   (2.14   8.512   1.005)
.
.
.

Unlike sampling or using probeLocations, until now AFAIK it is not possible to use U.component(0) to spit only the X-component. To resolve that using gnuplot, one can use:

Code:

plot 'probeFile' using "%lf (%lf %*lf %*lf)"

to plot the Ux component...

Hisham

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