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Merge branch 'boundarylayer_improvements' into 'master'

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Boundarylayer improvements

See merge request ngsolve/netgen!507
This commit is contained in:
Hochsteger, Matthias 2022-06-09 15:47:26 +02:00
commit 36ac5e5bcc
5 changed files with 104 additions and 31 deletions
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93
libsrc/meshing/boundarylayer.cpp
View File

@ -194,7 +194,8 @@ namespace netgen
ArrayMem<Point<3>, 4> BoundaryLayerTool :: GetMappedFace( SurfaceElementIndex sei, int face )
{
if(face == -1) return GetMappedFace(sei);
if(face == -1) return GetFace(sei);
if(face == -2) return GetMappedFace(sei);
const auto & sel = mesh[sei];
auto np = sel.GetNP();
auto pi0 = sel[face % np];
@ -210,23 +211,25 @@ namespace netgen
Vec<3> BoundaryLayerTool :: getEdgeTangent(PointIndex pi, int edgenr)
{
Vec<3> tangent = 0.0;
ArrayMem<PointIndex,2> pts;
for(auto segi : topo.GetVertexSegments(pi))
{
auto & seg = mesh[segi];
if(seg.edgenr != edgenr)
if(seg.edgenr != edgenr+1)
continue;
PointIndex other = seg[0]+seg[1]-pi;
tangent += mesh[other] - mesh[pi];
if(!pts.Contains(other))
pts.Append(other);
}
if(pts.Size() != 2)
throw Exception("Something went wrong in getEdgeTangent!");
tangent = mesh[pts[1]] - mesh[pts[0]];
return tangent.Normalize();
}
void BoundaryLayerTool :: LimitGrowthVectorLengths()
{
static Timer tall("BoundaryLayerTool::LimitGrowthVectorLengths"); RegionTimer rtall(tall);
height = 0.0;
for (auto h : params.heights)
height += h;
limits.SetSize(np);
limits = 1.0;
@ -320,7 +323,7 @@ namespace netgen
const auto & sel = mesh[sei];
if(sel.PNums().Contains(pi))
return false;
auto face = GetFace(sei);
auto face = GetMappedFace(sei, -2);
double lam_ = 999;
bool is_bl_sel = params.surfid.Contains(sel.GetIndex());
@ -464,6 +467,8 @@ namespace netgen
auto np = mesh.GetNP();
BitArray is_point_on_bl_surface(np+1);
is_point_on_bl_surface.Clear();
BitArray is_point_on_other_surface(np+1);
is_point_on_other_surface.Clear();
Array<Vec<3>, PointIndex> normals(np);
for(auto pi : Range(growthvectors))
normals[pi] = growthvectors[pi];
@ -474,20 +479,33 @@ namespace netgen
{
auto facei = mesh[sei].GetIndex();
if(facei < nfd_old && !params.surfid.Contains(facei))
continue;
for(auto pi : mesh[sei].PNums())
if(mesh[pi].Type() == SURFACEPOINT)
{
for(auto pi : mesh[sei].PNums())
if(mesh[pi].Type() == SURFACEPOINT)
is_point_on_other_surface.SetBitAtomic(pi);
}
else
{
for(auto pi : mesh[sei].PNums())
if(mesh[pi].Type() == SURFACEPOINT)
is_point_on_bl_surface.SetBitAtomic(pi);
}
}
});
Array<PointIndex> points;
for(PointIndex pi : mesh.Points().Range())
{
if(is_point_on_bl_surface[pi])
{
points.Append(pi);
growthvectors[pi] = 0.0;
}
if(is_point_on_other_surface[pi])
{
points.Append(pi);
}
}
// smooth tangential part of growth vectors from edges to surface elements
RegionTimer rtsmooth(tsmooth);
@ -511,7 +529,10 @@ namespace netgen
auto gw_other = growthvectors[pi1];
auto normal_other = getNormal(mesh[sei]);
auto tangent_part = gw_other - (gw_other*normal_other)*normal_other;
new_gw += tangent_part;
if(is_point_on_bl_surface[pi])
new_gw += tangent_part;
else
new_gw += gw_other;
}
}
@ -533,6 +554,10 @@ namespace netgen
//for(auto & seg : mesh.LineSegments())
//seg.edgenr = seg.epgeominfo[1].edgenr;
height = 0.0;
for (auto h : params.heights)
height += h;
max_edge_nr = -1;
for(const auto& seg : mesh.LineSegments())
if(seg.edgenr > max_edge_nr)
@ -777,7 +802,7 @@ namespace netgen
// interpolate tangential component of growth vector along edge
for(auto edgenr : Range(max_edge_nr))
{
if(!is_edge_moved[edgenr+1]) continue;
// if(!is_edge_moved[edgenr+1]) continue;
// build sorted list of edge
Array<PointIndex> points;
@ -785,6 +810,9 @@ namespace netgen
double edge_len = 0.;
auto is_end_point = [&] (PointIndex pi)
{
// if(mesh[pi].Type() == FIXEDPOINT)
// return true;
// return false;
auto segs = topo.GetVertexSegments(pi);
auto first_edgenr = mesh[segs[0]].edgenr;
for(auto segi : segs)
@ -792,17 +820,31 @@ namespace netgen
return true;
return false;
};
bool any_grows = false;
for(const auto& seg : segments)
{
if(seg.edgenr-1 == edgenr && is_end_point(seg[0]))
if(seg.edgenr-1 == edgenr)
{
points.Append(seg[0]);
points.Append(seg[1]);
edge_len += (mesh[seg[1]] - mesh[seg[0]]).Length();
break;
if(growthvectors[seg[0]].Length2() != 0 ||
growthvectors[seg[1]].Length2() != 0)
any_grows = true;
if(points.Size() == 0 && is_end_point(seg[0]))
{
points.Append(seg[0]);
points.Append(seg[1]);
edge_len += (mesh[seg[1]] - mesh[seg[0]]).Length();
}
}
}
if(!any_grows)
continue;
if(!points.Size())
throw Exception("Could not find startpoint for edge " + ToString(edgenr));
while(true)
{
bool point_found = false;
@ -831,17 +873,28 @@ namespace netgen
break;
if(!point_found)
{
cout << "points = " << points << endl;
throw Exception(string("Could not find connected list of line segments for edge ") + edgenr);
}
}
if(growthvectors[points[0]].Length2() == 0 &&
growthvectors[points.Last()].Length2() == 0)
continue;
// tangential part of growth vectors
auto t1 = (mesh[points[1]]-mesh[points[0]]).Normalize();
auto gt1 = growthvectors[points[0]] * t1 * t1;
auto t2 = (mesh[points.Last()]-mesh[points[points.Size()-2]]).Normalize();
auto gt2 = growthvectors[points.Last()] * t2 * t2;
if(!is_edge_moved[edgenr+1])
{
if(growthvectors[points[0]] * (mesh[points[1]] - mesh[points[0]]) < 0)
gt1 = 0.;
if(growthvectors[points.Last()] * (mesh[points[points.Size()-2]] - mesh[points.Last()]) < 0)
gt2 = 0.;
}
double len = 0.;
for(size_t i = 1; i < points.Size()-1; i++)
{
@ -1262,7 +1315,9 @@ namespace netgen
auto in_surface_direction = ProjectGrowthVectorsOnSurface();
InterpolateGrowthVectors();
LimitGrowthVectorLengths();
if(params.limit_growth_vectors)
LimitGrowthVectorLengths();
FixVolumeElements();
InsertNewElements(segmap, in_surface_direction);
SetDomInOut();

1
libsrc/meshing/boundarylayer.hpp
View File

@ -18,6 +18,7 @@ public:
BitArray domains;
bool outside = false; // set the boundary layer on the outside
bool grow_edges = false;
bool limit_growth_vectors = true;
Array<size_t> project_boundaries;
};

33
libsrc/meshing/meshfunc.cpp
View File

@ -201,6 +201,7 @@ namespace netgen
return;
NgArray<int, PointIndex::BASE> map;
std::set<std::tuple<int,int,int>> hex_faces;
for(auto identnr : Range(1,nmax+1))
{
if(identifications.GetType(identnr) != Identifications::CLOSESURFACES)
@ -211,6 +212,15 @@ namespace netgen
for(auto & sel : mesh.OpenElements())
{
// For quads: check if this open element is already closed by a hex
// this happends when we have identifications in two directions
if(sel.GetNP() == 4)
{
Element2d face = sel;
face.NormalizeNumbering();
if(hex_faces.count({face[0], face[1], face[2]}))
continue;
}
bool is_mapped = true;
for(auto pi : sel.PNums())
if(!PointIndex(map[pi]).IsValid())
@ -235,21 +245,26 @@ namespace netgen
if(pis.size() < 2*np)
continue;
bool is_domout = md.domain == mesh.GetFaceDescriptor(sel.GetIndex()).DomainOut();
// check if new element is inside current domain
auto p0 = mesh[sel[0]];
Vec<3> n = Cross(mesh[sel[1]] - p0, mesh[sel[2]] - p0 );
n = is_domout ? n : -n;
Vec<3> n = -Cross(mesh[sel[1]] - p0, mesh[sel[2]] - p0 );
if(n*(mesh[el[np]]-p0) < 0.0)
continue;
if(is_domout)
el.Invert();
el.SetIndex(md.domain);
mesh.AddVolumeElement(el);
if(el.NP()==8)
{
// remember all adjacent faces of the new hex (to skip corresponding openelements accordingly)
for(auto facei : Range(1,7))
{
Element2d face;
el.GetFace(facei, face);
face.NormalizeNumbering();
hex_faces.insert({face[0], face[1], face[2]});
}
}
}
}
}
@ -576,9 +591,9 @@ namespace netgen
if (mp.checkoverlappingboundary)
if (md[i].mesh->CheckOverlappingBoundary())
throw NgException ("Stop meshing since boundary mesh is overlapping");
if(md[i].mesh->GetGeometry()->GetGeomType() == Mesh::GEOM_OCC)
FillCloseSurface( md[i] );
FillCloseSurface( md[i] );
CloseOpenQuads( md[i] );
MeshDomain(md[i]);
}, md.Size());

5
libsrc/meshing/python_mesh.cpp
View File

@ -1196,7 +1196,7 @@ DLL_HEADER void ExportNetgenMeshing(py::module &m)
string material,
variant<string, int> domain, bool outside,
optional<string> project_boundaries,
bool grow_edges)
bool grow_edges, bool limit_growth_vectors)
{
BoundaryLayerParameters blp;
if(int* bc = get_if<int>(&boundary); bc)
@ -1265,12 +1265,13 @@ DLL_HEADER void ExportNetgenMeshing(py::module &m)
blp.outside = outside;
blp.grow_edges = grow_edges;
blp.limit_growth_vectors = limit_growth_vectors;
GenerateBoundaryLayer (self, blp);
self.UpdateTopology();
}, py::arg("boundary"), py::arg("thickness"), py::arg("material"),
py::arg("domains") = ".*", py::arg("outside") = false,
py::arg("project_boundaries")=nullopt, py::arg("grow_edges")=true,
py::arg("project_boundaries")=nullopt, py::arg("grow_edges")=true, py::arg("limit_growth_vectors") = true,
R"delimiter(
Add boundary layer to mesh.

3
tests/pytest/test_boundarylayer.py
View File

@ -124,8 +124,9 @@ def test_pyramids(outside):
assert ngs.Integrate(1, mesh.Materials("layer")) == pytest.approx(0.0016)
assert ngs.Integrate(1, mesh.Materials("air")) == pytest.approx(0.9664 if outside else 0.968)
# not working yet
@pytest.mark.parametrize("outside", [True, False])
def test_with_inner_corner(outside, capfd):
def _test_with_inner_corner(outside, capfd):
geo = CSGeometry()
core_thickness = 0.1