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reactingEulerFoam: Mixture properties for moving phases only

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The calculations for mixture rho and U have been changed so that they
represent phase-averaged quantities over the moving phases only.

The mixture density is used as part of the pressure solution to
calculate buoyancy forces. The pressure within a stationary phase is
considered to be decoupled from the moving phases; i.e., it is
considered self-supporting. Therefore the stationary phase density
should not form a part of buoyancy calculations. This change to the
definition of mixture density ensures this.
This commit is contained in:
Will Bainbridge
2018-04-11 14:50:13 +01:00
parent 47a2dbcb29
commit efad85b0e6
1 changed files with 36 additions and 14 deletions
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50
applications/solvers/multiphase/reactingEulerFoam/phaseSystems/phaseSystem/phaseSystem.C
View File

@ -237,33 +237,55 @@ Foam::phaseSystem::~phaseSystem()
Foam::tmp<Foam::volScalarField> Foam::phaseSystem::rho() const Foam::tmp<Foam::volScalarField> Foam::phaseSystem::rho() const
{ {
tmp<volScalarField> tmpRho const label nMovingPhases = movingPhaseModels_.size();
(
phaseModels_[0]*phaseModels_[0].rho()
);
for (label phasei=1; phasei<phaseModels_.size(); phasei++) volScalarField rho(movingPhaseModels_[0]*movingPhaseModels_[0].rho());
for (label movingPhasei = 1; movingPhasei < nMovingPhases; ++ movingPhasei)
{ {
tmpRho.ref() += phaseModels_[phasei]*phaseModels_[phasei].rho(); rho +=
movingPhaseModels_[movingPhasei]
*movingPhaseModels_[movingPhasei].rho();
} }
return tmpRho; if (stationaryPhaseModels_.empty())
{
return rho;
}
volScalarField alpha(movingPhaseModels_[0]);
for (label movingPhasei = 1; movingPhasei < nMovingPhases; ++ movingPhasei)
{
alpha += movingPhaseModels_[movingPhasei];
}
return rho/alpha;
} }
Foam::tmp<Foam::volVectorField> Foam::phaseSystem::U() const Foam::tmp<Foam::volVectorField> Foam::phaseSystem::U() const
{ {
tmp<volVectorField> tmpU const label nMovingPhases = movingPhaseModels_.size();
(
phaseModels_[0]*phaseModels_[0].U()
);
for (label phasei=1; phasei<phaseModels_.size(); phasei++) volVectorField U(movingPhaseModels_[0]*movingPhaseModels_[0].U());
for (label movingPhasei = 1; movingPhasei < nMovingPhases; ++ movingPhasei)
{ {
tmpU.ref() += phaseModels_[phasei]*phaseModels_[phasei].U(); U +=
movingPhaseModels_[movingPhasei]
*movingPhaseModels_[movingPhasei].U();
} }
return tmpU; if (stationaryPhaseModels_.empty())
{
return U;
}
volScalarField alpha(movingPhaseModels_[0]);
for (label movingPhasei = 1; movingPhasei < nMovingPhases; ++ movingPhasei)
{
alpha += movingPhaseModels_[movingPhasei];
}
return U/alpha;
} }