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ENH: snappyHexMesh: allow medialAxis to shrink 1 or 2 cell thick channel. Fixes #986.

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This commit is contained in:
mattijs
2018-08-30 11:38:38 +01:00
parent 76a07d1cd0
commit bf43a9d91e
3 changed files with 86 additions and 38 deletions
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7
applications/utilities/mesh/generation/snappyHexMesh/snappyHexMeshDict
View File

@ -665,6 +665,13 @@ addLayersControls
// Default is 0.5*featureAngle. Set to -180 always attempt extrusion
//layerTerminationAngle 25;
// Optional: disable shrinking of edges that have one (or two) points
// on an extruded patch.
// Default is false to enable single/two cell thick channels to still
// have layers. In <=1806 this was true by default. On larger gaps it
// should have no effect.
//disableWallEdges true;
// Optional: at non-patched sides allow mesh to slip if extrusion
// direction makes angle larger than slipFeatureAngle. Default is
// 0.5*featureAngle.

114
src/mesh/snappyHexMesh/externalDisplacementMeshMover/medialAxisMeshMover.C
View File

@ -58,33 +58,42 @@ bool Foam::medialAxisMeshMover::isMaxEdge
(
const List<PointData<vector>>& pointWallDist,
const label edgeI,
const scalar minCos
const scalar minCos,
const bool disableWallEdges
) const
{
const pointField& points = mesh().points();
// Do not mark edges with one side on moving wall.
const edge& e = mesh().edges()[edgeI];
vector v0(points[e[0]] - pointWallDist[e[0]].origin());
scalar magV0(mag(v0));
if (magV0 < SMALL)
if (disableWallEdges)
{
return false;
// 1. Do not mark edges with one side on moving wall.
vector v0(points[e[0]] - pointWallDist[e[0]].origin());
scalar magV0(mag(v0));
if (magV0 < SMALL)
{
return false;
}
vector v1(points[e[1]] - pointWallDist[e[1]].origin());
scalar magV1(mag(v1));
if (magV1 < SMALL)
{
return false;
}
}
vector v1(points[e[1]] - pointWallDist[e[1]].origin());
scalar magV1(mag(v1));
//// 2. Do not mark edges with both sides on a moving wall.
//vector v0(points[e[0]] - pointWallDist[e[0]].origin());
//scalar magV0(mag(v0));
//vector v1(points[e[1]] - pointWallDist[e[1]].origin());
//scalar magV1(mag(v1));
//if (magV0 < SMALL && magV1 < SMALL)
//{
// return false;
//}
if (magV1 < SMALL)
{
return false;
}
//- Detect based on vector to nearest point differing for both endpoints
//// 3. Detect based on vector to nearest point differing for both endpoints
//v0 /= magV0;
//v1 /= magV1;
//
@ -170,6 +179,13 @@ void Foam::medialAxisMeshMover::update(const dictionary& coeffDict)
mesh().globalData().nTotalPoints()
);
const bool disableWallEdges = coeffDict.lookupOrDefault<bool>
(
"disableWallEdges",
false
);
// Predetermine mesh edges
// ~~~~~~~~~~~~~~~~~~~~~~~
@ -336,7 +352,16 @@ void Foam::medialAxisMeshMover::update(const dictionary& coeffDict)
}
}
else if (isMaxEdge(pointWallDist, edgeI, minMedialAxisAngleCos))
else if
(
isMaxEdge
(
pointWallDist,
edgeI,
minMedialAxisAngleCos,
disableWallEdges
)
)
{
// Both end points of edge have very different nearest wall
// point. Mark both points as medial axis points.
@ -351,41 +376,56 @@ void Foam::medialAxisMeshMover::update(const dictionary& coeffDict)
// Calculate distance along edge
const point& p0 = points[e[0]];
const point& origin0 = pointWallDist[e[0]].origin();
const point& p1 = points[e[1]];
scalar dist0 = (p0-pointWallDist[e[0]].origin()) & eVec;
scalar dist1 = (pointWallDist[e[1]].origin()-p1) & eVec;
const point& origin1 = pointWallDist[e[1]].origin();
scalar dist0 = (p0-origin0) & eVec;
scalar dist1 = (origin1-p1) & eVec;
scalar s = 0.5*(dist1+eMag+dist0);
point medialAxisPt;
point medialAxisPt(vector::max);
if (s <= dist0)
{
medialAxisPt = p0;
// Make sure point is not on wall. Note that this
// check used to be inside isMaxEdge.
if (magSqr((p0-origin0)) > Foam::sqr(SMALL))
{
medialAxisPt = p0;
}
}
else if (s >= dist0+eMag)
{
medialAxisPt = p1;
// Make sure point is not on wall. Note that this
// check used to be inside isMaxEdge.
if (magSqr((p1-origin1)) > Foam::sqr(SMALL))
{
medialAxisPt = p1;
}
}
else
{
medialAxisPt = p0+(s-dist0)*eVec;
}
forAll(e, ep)
if (medialAxisPt != vector::max)
{
label pointI = e[ep];
if (!pointMedialDist[pointI].valid(dummyTrackData))
forAll(e, ep)
{
maxPoints.append(pointI);
maxInfo.append
(
pointEdgePoint
label pointI = e[ep];
if (!pointMedialDist[pointI].valid(dummyTrackData))
{
maxPoints.append(pointI);
maxInfo.append
(
medialAxisPt, //points[pointI],
magSqr(points[pointI]-medialAxisPt)//0.0
)
);
pointMedialDist[pointI] = maxInfo.last();
pointEdgePoint
(
medialAxisPt, //points[pointI],
magSqr(points[pointI]-medialAxisPt)//0.0
)
);
pointMedialDist[pointI] = maxInfo.last();
}
}
}
}

3
src/mesh/snappyHexMesh/externalDisplacementMeshMover/medialAxisMeshMover.H
View File

@ -114,7 +114,8 @@ class medialAxisMeshMover
(
const List<PointData<vector>>& pointWallDist,
const label edgeI,
const scalar minCos
const scalar minCos,
const bool checkWall
) const;
//- Initialise medial axis. Uses pointDisplacement field only