[vkoppejan]

Hi everyone,

I was wondering if there's a way to pass environment variables to OpenFOAM discitonaries.

For instance, say I define ndoms = 4 (via export ndoms = 4), could I somehow use $ndoms in the decomposeParDict? I start my runs from slurm so all var's are defined for a single simulation only.

Cheers,

Victor

[floquation]

I use "pyFoamFromTemplate.py" in a "prepareScript.sh" script to substitute variables into dictionaries.
Parameters I specify in a local file called "params.sh", but environmental variables are possible as well, as long as you define what I called "PARAMS_SETFIELD".

Minimal example:
./params.sh:

# Geometry
Wz=`echo "2*0.005" | bc -l`
Gamma=0.5

Wx=`echo "$Wz*$Gamma" | bc -l`
Wy=$Wx

# Bubble
h_b=`echo "0.1*$Wz" | bc -l` # initial bubble height
r_b=`echo "0.05*$Wz" | bc -l` # initial bubble radius

x_b=`echo "$Wx/2" | bc -l`
y_b=$x_b

# (...)

PARAMS_SETFIELD="{'x_b':$x_b,'y_b':$y_b,'h_b':$h_b,'r_b':$r_b}"

./prepareScript.sh:

usage()
{
        echo " Usage: $0"
        echo " A file named \"params.sh\" should be in your cwd. "
        exit;
}
#### ####### #####

#### PARAMETERS #####
if [ -f "./params.sh" ]; then
    . ./params.sh
else
    usage
fi

# (...)

pyFoamFromTemplate.py ./system/setFieldsDict $PARAMS_SETFIELD || exit 1

# (...)

# setFields
echo "----> setFields"
mv "0/alpha.water.org" "0/alpha.water"
setFields > ./logs/setFields.log || exit 1

./system/setFieldsDict.template:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.0                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      setFieldsDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

defaultFieldValues
(
    volScalarFieldValue alpha.water 1
);

regions
(
    sphereToCell
    {
        centre ($x_b$ $y_b$ $h_b$);
        radius $r_b$;
        fieldValues
        (
            volScalarFieldValue alpha.water 0
        );
    }
 );


// ************************************************************************* //

[vkoppejan]

Looks nice, I haven't scripted OF with python before but this looks clever.

Cheers,

Victor

[floquation]

Originally Posted by vkoppejan

Looks nice, I haven't scripted OF with python before but this looks clever.

I'm lazy, so I want the computer to do as much as possible for me.
That... Or I like writing code more than typing parameters and running a case.

Note though, I did not actually write any python myself here. Of course, pyFoam is a python library, but all I did was write bash.