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ENH: tetOverlapVolume - improved robustness. Fixes #207

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This commit is contained in:
Andrew Heather
2016-08-11 12:14:43 +01:00
parent 582ee21ef0
commit 6afc9fb15d
3 changed files with 72 additions and 45 deletions
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6
src/meshTools/tetOverlapVolume/tetOverlapVolume.C
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@ -39,12 +39,6 @@ namespace Foam
defineTypeNameAndDebug(tetOverlapVolume, 0);
}
// When to consider a tet to be zero volume. We want to avoid doing clipping
// against negative volume tets. Tet volume can be calculated incorrectly
// due to truncation errors. The value below works for single and double
// precision but could probably be tighter for double precision.
Foam::scalar Foam::tetOverlapVolume::minTetVolume_ = SMALL*SMALL;
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //

6
src/meshTools/tetOverlapVolume/tetOverlapVolume.H
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@ -54,12 +54,6 @@ class polyMesh;
class tetOverlapVolume
{
// Private data
//- Minimum tet volume to skip test
static scalar minTetVolume_;
// Private classes
//- tetPoints handling : sum resulting volumes

59
src/meshTools/tetOverlapVolume/tetOverlapVolumeTemplates.C
View File

@ -3,7 +3,7 @@
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2015 OpenFOAM Foundation
\\/ M anipulation |
\\/ M anipulation | Copyright (C) 2016 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
@ -45,21 +45,52 @@ void Foam::tetOverlapVolume::tetTetOverlap
tetPointRef::storeOp cutInside(cutInsideTets, nCutInside);
tetPointRef::dummyOp outside;
if (tetA.tet().mag() < minTetVolume_ || tetB.tet().mag() < minTetVolume_)
// Precompute the tet face areas and exit early if any face area is
// too small
static FixedList<vector, 4> tetAFaceAreas;
static FixedList<scalar, 4> tetAMag2FaceAreas;
tetPointRef tetATet = tetA.tet();
for (label facei = 0; facei < 4; ++facei)
{
tetAFaceAreas[facei] = -tetATet.tri(facei).normal();
tetAMag2FaceAreas[facei] = magSqr(tetAFaceAreas[facei]);
if (tetAMag2FaceAreas[facei] < ROOTVSMALL)
{
return;
}
}
static FixedList<vector, 4> tetBFaceAreas;
static FixedList<scalar, 4> tetBMag2FaceAreas;
tetPointRef tetBTet = tetB.tet();
for (label facei = 0; facei < 4; ++facei)
{
tetBFaceAreas[facei] = -tetBTet.tri(facei).normal();
tetBMag2FaceAreas[facei] = magSqr(tetBFaceAreas[facei]);
if (tetBMag2FaceAreas[facei] < ROOTVSMALL)
{
return;
}
}
// Face 0
{
vector n = tetBFaceAreas[0]/Foam::sqrt(tetBMag2FaceAreas[0]);
plane pl0(tetBTet.tri(0).a(), n, false);
// face0
plane pl0(tetB[1], tetB[3], tetB[2]);
tetA.tet().sliceWithPlane(pl0, cutInside, outside);
if (nCutInside == 0)
{
return;
}
}
// Face 1
{
vector n = tetBFaceAreas[1]/Foam::sqrt(tetBMag2FaceAreas[1]);
plane pl1(tetBTet.tri(1).a(), n, false);
// face1
plane pl1(tetB[0], tetB[2], tetB[3]);
nInside = 0;
for (label i = 0; i < nCutInside; i++)
{
@ -70,9 +101,13 @@ void Foam::tetOverlapVolume::tetTetOverlap
{
return;
}
}
// Face 2
{
vector n = tetBFaceAreas[2]/Foam::sqrt(tetBMag2FaceAreas[2]);
plane pl2(tetBTet.tri(2).a(), n, false);
// face2
plane pl2(tetB[0], tetB[3], tetB[1]);
nCutInside = 0;
for (label i = 0; i < nInside; i++)
{
@ -83,15 +118,19 @@ void Foam::tetOverlapVolume::tetTetOverlap
{
return;
}
}
// face3
plane pl3(tetB[0], tetB[1], tetB[2]);
// Face 3
{
vector n = tetBFaceAreas[3]/Foam::sqrt(tetBMag2FaceAreas[3]);
plane pl3(tetBTet.tri(3).a(), n, false);
for (label i = 0; i < nCutInside; i++)
{
const tetPointRef t = cutInsideTets[i].tet();
t.sliceWithPlane(pl3, insideOp, outside);
}
}
}
template<class tetsOp>