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Concentrate harmonic interpolation

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This commit is contained in:
Henrik Rusche 2012-06-09 20:47:38 +02:00
parent f2ef2a57db
commit 3915b701f7
5 changed files with 224 additions and 244 deletions
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116
src/finiteVolume/fields/fvPatchFields/constraint/regionCoupling/regionCouplingFvPatchField.C
View file

@ -29,7 +29,7 @@ Author
#include "regionCouplingFvPatchField.H"
#include "symmTransformField.H"
#include "magLongDelta.H"
#include "harmonic.H"
#include "volFields.H"
#include "surfaceFields.H"
@ -40,111 +40,6 @@ namespace Foam
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
template<class Type>
tmp<scalarField>
regionCouplingFvPatchField<Type>::weights
(
const Field<Type>& fOwn,
const Field<Type>& fNei
) const
{
// Implement weights-based stabilised harmonic interpolation using
// magnitude of type
// Algorithm:
// 1) calculate magnitude of internal field and neighbour field
// 2) calculate harmonic mean magnitude
// 3) express harmonic mean magnitude as: mean = w*mOwn + (1 - w)*mNei
// 4) Based on above, calculate w = (mean - mNei)/(mOwn - mNei)
// 5) Use weights to interpolate values
tmp<scalarField> tweights(new scalarField(fOwn.size(), 0.5));
scalarField& weights = tweights();
// Larger small for complex arithmetic accuracy
const scalar kSmall = 1000*SMALL;
# if 0
// Hrv's treatment
scalarField mOwn = mag(fOwn);
scalarField mNei = mag(fNei);
scalarField mean = 2*(mOwn*mNei)/(mOwn + mNei);
scalar den;
forAll (weights, faceI)
{
den = (mNei[faceI] - mOwn[faceI]);
// Note: complex arithmetic requires extra accuracy
// This is a division of two close subtractions
// HJ, 28/Sep/2011
if (mag(den) > kSmall)
{
// Limit weights for round-off safety
weights[faceI] =
Foam::max(0, Foam::min((mNei[faceI] - mean[faceI])/den, 1));
}
else
{
// Use 0.5 weights
}
}
# else
// Henrik's treatment
const fvPatch& p = this->patch();
// Note: for interpolation, work with face fields, to allow wall-corrected
// diffusivity (eg wall functions) to operate correctly.
// HJ, 28/Sep/2011
// Mag long deltas are identical on both sides. HJ, 28/Sep/2011
const magLongDelta& mld = magLongDelta::New(p.boundaryMesh().mesh());
scalarField magPhiOwn = mag(fOwn);
scalarField magPhiNei = mag(fNei);
const scalarField& pWeights = p.weights();
const scalarField& pDeltaCoeffs = p.deltaCoeffs();
const scalarField& pLongDelta = mld.magDelta(p.index());
forAll (weights, faceI)
{
scalar mOwn = magPhiOwn[faceI]/(1 - pWeights[faceI]);
scalar mNei = magPhiNei[faceI]/pWeights[faceI];
scalar den = magPhiNei[faceI] - magPhiOwn[faceI];
// Note: complex arithmetic requires extra accuracy
// This is a division of two close subtractions
// HJ, 28/Sep/2011
if (mag(den) > kSmall)
{
scalar mean = mOwn*mNei/
(
(mOwn + mNei)*
pLongDelta[faceI]*
pDeltaCoeffs[faceI]
);
// Limit weights for round-off safety
weights[faceI] =
Foam::max(0, Foam::min((magPhiNei[faceI] - mean)/den, 1));
}
else
{
// Use 0.5 weights
//weights[faceI] = 0.5;
}
}
#endif
return tweights;
}
template<class Type>
const Foam::Field<Type>& regionCouplingFvPatchField<Type>::originalPatchField() const
{
@ -152,7 +47,6 @@ const Foam::Field<Type>& regionCouplingFvPatchField<Type>::originalPatchField()
{
// Store original field for symmetric evaluation
// Henrik Rusche, Aug/2011
Info << "store original field" << endl;
originalPatchField_ = *this;
curTimeIndex_ = this->db().time().timeIndex();
@ -394,7 +288,9 @@ void regionCouplingFvPatchField<Type>::initEvaluate
);
// Do interpolation
scalarField weights = this->weights(fOwn, fNei);
harmonic<Type> interp(this->patch().boundaryMesh().mesh());
scalarField weights = interp.weights(fOwn, fNei, this->patch());
Field<Type>::operator=(weights*fOwn + (1.0 - weights)*fNei);
@ -445,7 +341,9 @@ void regionCouplingFvPatchField<Type>::updateCoeffs()
Field<Type> fNei = this->patchNeighbourField();
// Do interpolation
scalarField weights = this->weights(fOwn, fNei);
harmonic<Type> interp(this->patch().boundaryMesh().mesh());
scalarField weights = interp.weights(fOwn, fNei, this->patch());
Field<Type>::operator=(weights*fOwn + (1.0 - weights)*fNei);

7
src/finiteVolume/fields/fvPatchFields/constraint/regionCoupling/regionCouplingFvPatchField.H
View file

@ -88,13 +88,6 @@ protected:
return matrixUpdateBuffer_;
}
//- Calculate interpolation weights
tmp<scalarField> weights
(
const Field<Type>& fOwn,
const Field<Type>& fNei
) const;
public:

1
src/finiteVolume/interpolation/surfaceInterpolation/schemes/harmonic/harmonic.C
View file

@ -37,4 +37,5 @@ namespace Foam
makeSurfaceInterpolationScheme(harmonic)
}
// ************************************************************************* //

143
src/finiteVolume/interpolation/surfaceInterpolation/schemes/harmonic/harmonic.H
View file

@ -1,4 +1,4 @@
/*---------------------------------------------------------------------------*\
/*---------------------------------------------------------------------------* \
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
@ -108,135 +108,16 @@ public:
virtual tmp<surfaceScalarField> weights
(
const GeometricField<Type, fvPatchField, volMesh>& phi
) const
{
tmp<surfaceScalarField> tw
(
new surfaceScalarField
(
IOobject
(
"harmonicWeightingFactors" + phi.name(),
this->mesh().time().timeName(),
this->mesh()
),
this->mesh() ,
dimless
)
);
) const;
const surfaceScalarField& deltaCoeffs = this->mesh().deltaCoeffs();
const surfaceScalarField& weights = this->mesh().weights();
//- Return the interpolation weighting factors for a patch
tmp<scalarField> weights
(
const Field<Type>& fOwn,
const Field<Type>& fNei,
const fvPatch& patch
) const;
const magLongDelta& mld = magLongDelta::New(this->mesh());
const surfaceScalarField& longDelta = mld.magDelta();
surfaceScalarField& w = tw();
const unallocLabelList& owner = this->mesh().owner();
const unallocLabelList& neighbour = this->mesh().neighbour();
scalarField magPhi = mag(phi);
scalarField& wIn = w.internalField();
// Larger small for complex arithmetic accuracy
const scalar kSmall = 1000*SMALL;
// Calculate internal weights using field magnitude
forAll (owner, faceI)
{
label own = owner[faceI];
label nei = neighbour[faceI];
scalar mOwn = magPhi[own]/(1 - weights[faceI]);
scalar mNei = magPhi[nei]/weights[faceI];
scalar den = magPhi[nei] - magPhi[own];
scalar mean = mOwn*mNei/
((mOwn + mNei)*longDelta[faceI]*deltaCoeffs[faceI]);
// Note: complex arithmetic requires extra accuracy
// This is a division of two close subtractions
// HJ, 28/Sep/2011
if (mag(den) > kSmall)
{
// Limit weights for round-off safety
wIn[faceI] =
Foam::max(0, Foam::min((magPhi[nei] - mean)/den, 1));
}
else
{
wIn[faceI] = 0.5;
}
}
forAll (phi.boundaryField(), pi)
{
fvsPatchScalarField& wp = w.boundaryField()[pi];
const fvPatchField<Type>& pPhi = phi.boundaryField()[pi];
if (pPhi.coupled())
{
const scalarField& pWeights = weights.boundaryField()[pi];
scalarField magPhiOwn = mag(pPhi.patchInternalField());
scalarField magPhiNei = mag(pPhi.patchNeighbourField());
const scalarField& pDeltaCoeffs =
deltaCoeffs.boundaryField()[pi];
const scalarField& pLongDelta = mld.magDelta(pi);
// Calculate internal weights using field magnitude
forAll (pPhi, faceI)
{
scalar mOwn = magPhiOwn[faceI]/(1 - pWeights[faceI]);
scalar mNei = magPhiNei[faceI]/pWeights[faceI];
scalar den = magPhiNei[faceI] - magPhiOwn[faceI];
// Note: complex arithmetic requires extra accuracy
// This is a division of two close subtractions
// HJ, 28/Sep/2011
if (mag(den) > kSmall)
{
scalar mean = mOwn*mNei/
(
(mOwn + mNei)*
pLongDelta[faceI]*
pDeltaCoeffs[faceI]
);
// Limit weights for round-off safety
wp[faceI] =
Foam::max
(
0,
Foam::min
(
(magPhiNei[faceI] - mean)/den,
1
)
);
}
else
{
wp[faceI] = 0.5;
}
}
}
else
{
// Boundary weights for uncoupled patches are 1
wp = 1;
}
}
return tw;
}
};
@ -246,6 +127,12 @@ public:
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#ifdef NoRepository
# include "harmonicTemplates.C"
#endif
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //

201
src/finiteVolume/interpolation/surfaceInterpolation/schemes/harmonic/harmonicTemplates.C Normal file
View file

@ -0,0 +1,201 @@
/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright held by original author
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM; if not, write to the Free Software Foundation,
Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Description
Harmonic-mean differencing scheme class.
\*---------------------------------------------------------------------------*/
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
template<class Type>
Foam::tmp<Foam::surfaceScalarField> Foam::harmonic<Type>::weights
(
const GeometricField<Type, fvPatchField, volMesh>& phi
) const
{
// Implement weights-based stabilised harmonic interpolation using
// magnitude of type
// Algorithm:
// 1) calculate magnitude of internal field and neighbour field
// 2) calculate harmonic mean magnitude
// 3) express harmonic mean magnitude as: mean = w*mOwn + (1 - w)*mNei
// 4) Based on above, calculate w = (mean - mNei)/(mOwn - mNei)
// 5) Use weights to interpolate values
tmp<surfaceScalarField> tw
(
new surfaceScalarField
(
IOobject
(
"harmonicWeightingFactors" + phi.name(),
this->mesh().time().timeName(),
this->mesh()
),
this->mesh() ,
dimless
)
);
const surfaceScalarField& deltaCoeffs = this->mesh().deltaCoeffs();
const surfaceScalarField& weights = this->mesh().weights();
const magLongDelta& mld = magLongDelta::New(this->mesh());
const surfaceScalarField& longDelta = mld.magDelta();
surfaceScalarField& w = tw();
const unallocLabelList& owner = this->mesh().owner();
const unallocLabelList& neighbour = this->mesh().neighbour();
scalarField magPhi = mag(phi);
scalarField& wIn = w.internalField();
// Larger small for complex arithmetic accuracy
const scalar kSmall = 1000*SMALL;
// Calculate internal weights using field magnitude
forAll (owner, faceI)
{
label own = owner[faceI];
label nei = neighbour[faceI];
scalar mOwn = magPhi[own]/(1 - weights[faceI]);
scalar mNei = magPhi[nei]/weights[faceI];
scalar den = magPhi[nei] - magPhi[own];
scalar mean = mOwn*mNei/
((mOwn + mNei)*longDelta[faceI]*deltaCoeffs[faceI]);
// Note: complex arithmetic requires extra accuracy
// This is a division of two close subtractions
// HJ, 28/Sep/2011
if (mag(den) > kSmall)
{
// Limit weights for round-off safety
wIn[faceI] =
Foam::max(0, Foam::min((magPhi[nei] - mean)/den, 1));
}
else
{
wIn[faceI] = 0.5;
}
}
forAll (phi.boundaryField(), pi)
{
fvsPatchScalarField& wp = w.boundaryField()[pi];
const fvPatchField<Type>& pPhi = phi.boundaryField()[pi];
if (pPhi.coupled())
{
wp = this->weights
(
pPhi.patchInternalField(),
pPhi.patchNeighbourField(),
pPhi.patch()
);
}
else
{
// Boundary weights for uncoupled patches are 1
wp = 1;
}
}
return tw;
}
template<class Type>
Foam::tmp<Foam::scalarField> Foam::harmonic<Type>::weights
(
const Field<Type>& fOwn,
const Field<Type>& fNei,
const fvPatch& patch
) const
{
// Implement weights-based stabilised harmonic interpolation using
// magnitude of type
// Algorithm:
// 1) calculate magnitude of internal field and neighbour field
// 2) calculate harmonic mean magnitude
// 3) express harmonic mean magnitude as: mean = w*mOwn + (1 - w)*mNei
// 4) Based on above, calculate w = (mean - mNei)/(mOwn - mNei)
// 5) Use weights to interpolate values
tmp<scalarField> tweights(new scalarField(fOwn.size(), 0.5));
scalarField& weights = tweights();
// Larger small for complex arithmetic accuracy
const scalar kSmall = 1000*SMALL;
// Mag long deltas are identical on both sides. HJ, 28/Sep/2011
const magLongDelta& mld = magLongDelta::New(this->mesh());
scalarField magPhiOwn = mag(fOwn);
scalarField magPhiNei = mag(fNei);
const scalarField& pWeights = patch.weights();
const scalarField& pDeltaCoeffs = patch.deltaCoeffs();
const scalarField& pLongDelta = mld.magDelta(patch.index());
forAll (weights, faceI)
{
scalar mOwn = magPhiOwn[faceI]/(1 - pWeights[faceI]);
scalar mNei = magPhiNei[faceI]/pWeights[faceI];
scalar den = magPhiNei[faceI] - magPhiOwn[faceI];
// Note: complex arithmetic requires extra accuracy
// This is a division of two close subtractions
// HJ, 28/Sep/2011
if (mag(den) > kSmall)
{
scalar mean = mOwn*mNei/
(
(mOwn + mNei)*
pLongDelta[faceI]*
pDeltaCoeffs[faceI]
);
// Limit weights for round-off safety
weights[faceI] =
Foam::max(0, Foam::min((magPhiNei[faceI] - mean)/den, 1));
}
else
{
// Use 0.5 weights
}
}
return tweights;
}
// ************************************************************************* //