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compressible::alphatWallBoilingWallFunction: Improved solution procedure

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This boundary condition now solves for the wall temperature by interval
bisection, which should be significantly more robust than the previous
fixed-point iteration procedure. There is a new non-dimensional
"tolerance" setting that controls how tightly this solution procedure
solves the wall temperature. The "relax" setting is no longer used.

The boundary condition no longer triggers re-evaluation of the
temperature condition in order to re-calculate the heat flux within the
solution iteration. Instead, it extracts physical coefficients from the
form of the boundary condition and uses these to form a linearised
approximation of the heat flux. This is a more general approach, and
will not trigger side-effects associated with re-evaluating the
temperature condition.

The fixedMultiphaseHeatFlux condition has been replaced by a
uniformFixedMultiphaseHeatFlux condition, which constructs a mixed
constraint which portions a specified heat flux between the phases in
such a way as to keep the boundary temperature uniform across all
phases. This can be applied to all phases. It is no longer necessary to
apply a heat flux model to one "master" phase, then map the resulting
temperature to the others. An example specification of this boundary
condition is as follows:

    wall
    {
        type            uniformFixedMultiphaseHeatFlux;
        q               1000;
        relax           0.3;
        value           $internalField;
    }

The wall boiling tutorials have been updated to use these new functions,
and time-varying heat input has been used to replace the
stop-modify-restart pattern present in the single-region cases.
This commit is contained in:
Will Bainbridge
2023-01-18 12:27:10 +00:00
parent 42c35a23a8
commit 377080de52
34 changed files with 1050 additions and 781 deletions
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138
tutorials/modules/multiphaseEuler/wallBoilingIATE/system/controlDict Normal file
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/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: dev
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
location "system";
object controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
application foamRun;
solver multiphaseEuler;
startFrom startTime;
startTime 0;
stopAt endTime;
endTime 4;
deltaT 0.0001;
writeControl adjustableRunTime;
writeInterval 0.5;
purgeWrite 0;
writeFormat ascii;
writePrecision 9;
writeCompression off;
timeFormat general;
timePrecision 6;
runTimeModifiable yes;
adjustTimeStep yes;
maxCo 0.5;
maxDeltaT 0.001;
functions
{
writeWallBoilingProperties
{
type wallBoilingProperties;
functionObjectLibs ( "libmultiphaseEulerFoamFunctionObjects.so" );
writeControl writeTime;
phase liquid;
}
outflow
{
type surfaceFieldValue;
functionObjectLibs ( "libfieldFunctionObjects.so" );
log yes;
writeFields false;
regionType patch;
name outlet;
operation sum;
fields ( alphaRhoPhi.gas alphaRhoPhi.liquid);
}
inflow
{
type surfaceFieldValue;
functionObjectLibs ( "libfieldFunctionObjects.so" );
log yes;
writeFields false;
regionType patch;
name inlet;
operation sum;
fields ( alphaRhoPhi.gas alphaRhoPhi.liquid);
}
outletGas
{
type surfaceFieldValue;
functionObjectLibs ( "libfieldFunctionObjects.so" );
log yes;
writeFields false;
regionType patch;
name outlet;
operation sum;
weightField alphaRhoPhi.gas;
fields ( h.gas );
}
outletLiquid
{
type surfaceFieldValue;
functionObjectLibs ( "libfieldFunctionObjects.so" );
log yes;
writeFields false;
regionType patch;
name outlet;
operation sum;
weightField alphaRhoPhi.liquid;
fields ( h.liquid );
}
inletGas
{
type surfaceFieldValue;
functionObjectLibs ( "libfieldFunctionObjects.so" );
log yes;
writeFields false;
regionType patch;
name inlet;
operation sum;
weightField alphaRhoPhi.gas;
fields ( h.gas );
}
inletLiquid
{
type surfaceFieldValue;
functionObjectLibs ( "libfieldFunctionObjects.so" );
log yes;
writeFields false;
regionType patch;
name inlet;
operation sum;
weightField alphaRhoPhi.liquid;
fields ( h.liquid );
}
#includeFunc writeObjects(d.gas)
}
// ************************************************************************* //