mirror of
https://develop.openfoam.com/Development/openfoam.git
synced 2025-11-28 03:28:01 +00:00
2af8d38827
Evolves an electrical potential equation
\f[
\grad \left( \sigma \grad V \right)
\f]
where \f$ V \f$ is electrical potential and \f$\sigma\f$ is the
electrical current
To provide a Joule heating contribution according to:
Differential form of Joule heating - power per unit volume:
\f[
\frac{d(P)}{d(V)} = J \cdot E
\f]
where \f$ J \f$ is the current density and \f$ E \f$ the electric
field.
If no magnetic field is present:
\f[
J = \sigma E
\f]
The electric field given by
\f[
E = \grad V
\f]
Therefore:
\f[
\frac{d(P)}{d(V)} = J \cdot E
= (sigma E) \cdot E
= (sigma \grad V) \cdot \grad V
\f]
Usage
Isotropic (scalar) electrical conductivity
\verbatim
jouleHeatingSourceCoeffs
{
anisotropicElectricalConductivity no;
// Optionally specify the conductivity as a function of
// temperature
// Note: if not supplied, this will be read from the time
// directory
sigma table
(
(273 1e5)
(1000 1e5)
);
}
\endverbatim
Anisotropic (vectorial) electrical conductivity
jouleHeatingSourceCoeffs
{
anisotropicElectricalConductivity yes;
coordinateSystem
{
type cartesian;
origin (0 0 0);
coordinateRotation
{
type axesRotation;
e1 (1 0 0);
e3 (0 0 1);
}
}
// Optionally specify sigma as a function of temperature
//sigma (31900 63800 127600);
//
//sigma table
//(
// (0 (0 0 0))
// (1000 (127600 127600 127600))
//);
}
Where:
\table
Property | Description | Required | Default
value
T | Name of temperature field | no | T
sigma | Electrical conductivity as a function of
temperature |no|
anisotropicElectricalConductivity | Anisotropic flag | yes |
\endtable
The electrical conductivity can be specified using either:
- If the \c sigma entry is present the electrical conductivity is
specified
as a function of temperature using a Function1 type
- If not present the sigma field will be read from file
- If the anisotropicElectricalConductivity flag is set to 'true',
sigma
should be specified as a vector quantity
76 lines
1.8 KiB
C++
76 lines
1.8 KiB
C++
/*--------------------------------*- C++ -*----------------------------------*\
|
|
| ========= | |
|
|
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
|
|
| \\ / O peration | Version: plus |
|
|
| \\ / A nd | Web: www.OpenFOAM.com |
|
|
| \\/ M anipulation | |
|
|
\*---------------------------------------------------------------------------*/
|
|
FoamFile
|
|
{
|
|
version 2.0;
|
|
format ascii;
|
|
class dictionary;
|
|
location "system";
|
|
object controlDict;
|
|
}
|
|
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
|
|
|
application chtMultiRegionSimpleFoam;
|
|
|
|
startFrom startTime;
|
|
|
|
startTime 0;
|
|
|
|
stopAt endTime;
|
|
|
|
endTime 20000;
|
|
|
|
deltaT 1;
|
|
|
|
writeControl timeStep;
|
|
|
|
writeInterval 50;
|
|
|
|
purgeWrite 2;
|
|
|
|
writeFormat ascii;
|
|
|
|
writePrecision 6;
|
|
|
|
writeCompression off;
|
|
|
|
timeFormat general;
|
|
|
|
timePrecision 6;
|
|
|
|
runTimeModifiable true;
|
|
|
|
functions
|
|
{
|
|
sample1
|
|
{
|
|
type sets;
|
|
libs ("libsampling.so");
|
|
writeControl outputTime;
|
|
region solid;
|
|
fields (T jouleHeatingSource:V jouleHeatingSource:sigma);
|
|
interpolationScheme cellPoint;
|
|
setFormat raw;
|
|
|
|
sets
|
|
(
|
|
centreLine
|
|
{
|
|
type uniform;
|
|
axis x;
|
|
start (-2.5 0.05 0.05);
|
|
end ( 2.5 0.05 0.05);
|
|
nPoints 20;
|
|
}
|
|
);
|
|
}
|
|
}
|
|
|
|
|
|
// ************************************************************************* //
|