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multiphaseEulerFoam: Change the specification of the residual drag and smooth the drag phase-fraction pre-factor

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* The residual drag is now specified in terms of a residual phase-fraction and slip-velocity.
* The drag phase-fraction pre-factor is smoothed so that the computational molecule matches that
  of the transport terms.
This commit is contained in:
Henry 2011-12-05 10:17:15 +00:00
parent 486fd2463f
commit a5eaa2bafd
3 changed files with 34 additions and 10 deletions
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14
applications/solvers/multiphase/multiphaseEulerFoam/interfacialModels/dragModels/dragModel/dragModel.C
View File

@ -46,11 +46,17 @@ Foam::dragModel::dragModel
interfaceDict_(interfaceDict),
phase1_(phase1),
phase2_(phase2),
residualDrag_
residualPhaseFraction_
(
"residualDrag",
dimensionSet(1, -3, -1, 0, 0),
interfaceDict.lookup("residualDrag")
"residualPhaseFraction",
dimless,
interfaceDict.lookup("residualPhaseFraction")
),
residualSlip_
(
"residualSlip",
dimVelocity,
interfaceDict.lookup("residualSlip")
)
{}

12
applications/solvers/multiphase/multiphaseEulerFoam/interfacialModels/dragModels/dragModel/dragModel.H
View File

@ -57,7 +57,8 @@ protected:
const dictionary& interfaceDict_;
const phaseModel& phase1_;
const phaseModel& phase2_;
dimensionedScalar residualDrag_;
dimensionedScalar residualPhaseFraction_;
dimensionedScalar residualSlip_;
public:
@ -117,9 +118,14 @@ public:
return phase2_;
}
const dimensionedScalar& residualDrag() const
const dimensionedScalar& residualPhaseFraction() const
{
return residualDrag_;
return residualPhaseFraction_;
}
const dimensionedScalar& residualSlip() const
{
return residualSlip_;
}
//- the dragfunction K used in the momentum eq.

18
applications/solvers/multiphase/multiphaseEulerFoam/multiphaseSystem/multiphaseSystem.C
View File

@ -30,6 +30,7 @@ License
#include "MULES.H"
#include "fvcSnGrad.H"
#include "fvcFlux.H"
#include "fvcAverage.H"
// * * * * * * * * * * * * * * * Static Member Data * * * * * * * * * * * * //
@ -626,9 +627,20 @@ Foam::multiphaseSystem::dragCoeffs() const
(
iter.key(),
(
dm.phase1()*dm.phase2()
*dm.K(mag(dm.phase1().U() - dm.phase2().U()))
+ dm.residualDrag()
max
(
fvc::average(dm.phase1())*fvc::average(dm.phase2()),
//dm.phase1()*dm.phase2(),
dm.residualPhaseFraction()
)
*dm.K
(
max
(
mag(dm.phase1().U() - dm.phase2().U()),
dm.residualSlip()
)
)
).ptr()
);
}