377080de52
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The fixedMultiphaseHeatFlux condition has been replaced by a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.
205 lines
5.7 KiB
C++
205 lines
5.7 KiB
C++
/*--------------------------------*- C++ -*----------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration | Website: https://openfoam.org
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\\ / A nd | Version: dev
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\\/ M anipulation |
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\*---------------------------------------------------------------------------*/
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FoamFile
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{
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format ascii;
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class dictionary;
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location "system";
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object controlDict;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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application foamRun;
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solver multiphaseEuler;
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startFrom startTime;
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startTime 0;
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stopAt endTime;
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endTime 4;
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deltaT 0.0001;
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writeControl adjustableRunTime;
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writeInterval 0.5;
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purgeWrite 0;
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writeFormat ascii;
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writePrecision 9;
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writeCompression off;
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timeFormat general;
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timePrecision 6;
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runTimeModifiable yes;
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adjustTimeStep yes;
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maxCo 0.5;
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maxDeltaT 0.001;
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functions
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{
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writeWallBoilingProperties
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{
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type wallBoilingProperties;
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functionObjectLibs ( "libmultiphaseEulerFoamFunctionObjects.so" );
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writeControl writeTime;
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phase liquid;
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}
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volumeDensity.diameter.bubbles
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{
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type populationBalanceSizeDistribution;
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functionObjectLibs ( "libmultiphaseEulerFoamFunctionObjects.so" );
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writeControl runTime;
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writeInterval 0.5;
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setFormat raw;
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log yes;
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functionType volumeConcentration;
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coordinateType diameter;
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regionType cellZone;
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name x349;
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populationBalance bubbles;
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}
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volumeDensity_bulk.diameter.bubbles
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{
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type populationBalanceSizeDistribution;
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functionObjectLibs ( "libmultiphaseEulerFoamFunctionObjects.so" );
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writeControl runTime;
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writeInterval 0.5;
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setFormat raw;
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log yes;
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functionType volumeConcentration;
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coordinateType diameter;
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regionType cellZone;
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name x349_bulk;
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populationBalance bubbles;
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}
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volumeDensity_wall.diameter.bubbles
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{
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type populationBalanceSizeDistribution;
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functionObjectLibs ( "libmultiphaseEulerFoamFunctionObjects.so" );
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writeControl runTime;
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writeInterval 0.5;
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setFormat raw;
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log yes;
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functionType volumeConcentration;
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coordinateType diameter;
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regionType cellZone;
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name x349_wall;
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populationBalance bubbles;
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}
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outflow
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{
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type surfaceFieldValue;
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functionObjectLibs ( "libfieldFunctionObjects.so" );
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log yes;
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writeFields false;
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regionType patch;
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name outlet;
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operation sum;
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fields ( alphaRhoPhi.gas alphaRhoPhi.gas2 alphaRhoPhi.liquid );
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}
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inflow
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{
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type surfaceFieldValue;
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functionObjectLibs ( "libfieldFunctionObjects.so" );
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log yes;
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writeFields false;
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regionType patch;
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name inlet;
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operation sum;
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fields ( alphaRhoPhi.gas alphaRhoPhi.gas2 alphaRhoPhi.liquid );
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}
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outletGas
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{
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type surfaceFieldValue;
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functionObjectLibs ( "libfieldFunctionObjects.so" );
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log yes;
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writeFields false;
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regionType patch;
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name outlet;
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operation sum;
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weightField alphaRhoPhi.gas;
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fields ( h.gas );
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}
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outletGas2
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{
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type surfaceFieldValue;
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functionObjectLibs ( "libfieldFunctionObjects.so" );
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log yes;
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writeFields false;
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regionType patch;
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name outlet;
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operation sum;
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weightField alphaRhoPhi.gas2;
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fields ( h.gas2 );
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}
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outletLiquid
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{
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type surfaceFieldValue;
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functionObjectLibs ( "libfieldFunctionObjects.so" );
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log yes;
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writeFields false;
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regionType patch;
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name outlet;
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operation sum;
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weightField alphaRhoPhi.liquid;
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fields ( h.liquid );
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}
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inletGas
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{
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type surfaceFieldValue;
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functionObjectLibs ( "libfieldFunctionObjects.so" );
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log yes;
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writeFields false;
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regionType patch;
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name inlet;
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operation sum;
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weightField alphaRhoPhi.gas;
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fields ( h.gas );
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}
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inletGas2
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{
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type surfaceFieldValue;
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functionObjectLibs ( "libfieldFunctionObjects.so" );
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log yes;
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writeFields false;
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regionType patch;
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name inlet;
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operation sum;
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weightField alphaRhoPhi.gas2;
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fields ( h.gas2 );
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}
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inletLiquid
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{
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type surfaceFieldValue;
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functionObjectLibs ( "libfieldFunctionObjects.so" );
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log yes;
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writeFields false;
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regionType patch;
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name inlet;
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operation sum;
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weightField alphaRhoPhi.liquid;
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fields ( h.liquid );
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}
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#includeFunc writeObjects(d.gas, d.gas2)
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}
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// ************************************************************************* //
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