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improve functionality of boundarylayer

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This commit is contained in:
Christopher Lackner 2020-04-23 15:44:32 +02:00
parent 7fe4ca9c4f
commit d752ada2bd
4 changed files with 321 additions and 116 deletions
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369
libsrc/meshing/boundarylayer.cpp
View File

@ -103,7 +103,7 @@ namespace netgen
function, in order to calculate the effective direction function, in order to calculate the effective direction
in which the prismatic layer should grow in which the prismatic layer should grow
*/ */
Vec<3> GetSurfaceNormal(Mesh & mesh, const Element2d & el) inline Vec<3> GetSurfaceNormal(Mesh & mesh, const Element2d & el)
{ {
auto v0 = mesh[el[0]]; auto v0 = mesh[el[0]];
auto v1 = mesh[el[1]]; auto v1 = mesh[el[1]];
@ -115,12 +115,9 @@ namespace netgen
return normal; return normal;
} }
/* /*
Philippose Rajan - 11 June 2009 Philippose Rajan - 11 June 2009
modified by Christopher Lackner Apr 2020
Added an initial experimental function for Added an initial experimental function for
generating prismatic boundary layers on generating prismatic boundary layers on
@ -149,10 +146,38 @@ namespace netgen
PrintMessage(3, "Old NP: ", mesh.GetNP()); PrintMessage(3, "Old NP: ", mesh.GetNP());
PrintMessage(3, "Old NSE: ",mesh.GetNSE()); PrintMessage(3, "Old NSE: ",mesh.GetNSE());
map<tuple<int, int, int>, int> domains_to_surf_index;
map<tuple<PointIndex, PointIndex>, int> pi_to_edgenr;
map<int, int> last_layer_surface_index_map;
int max_surface_index = mesh.GetNFD();
int max_edge_nr = -1;
for(const auto& seg : mesh.LineSegments())
if(seg.edgenr > max_edge_nr)
max_edge_nr = seg.edgenr;
for(int layer = blp.heights.Size(); layer >= 1; layer--) for(int layer = blp.heights.Size(); layer >= 1; layer--)
{ {
PrintMessage(3, "Generating layer: ", layer); PrintMessage(3, "Generating layer: ", layer);
auto map_surface_index = [&](auto si)
{
if(last_layer_surface_index_map.find(si) == last_layer_surface_index_map.end())
{
last_layer_surface_index_map[si] = ++max_surface_index;
auto& old_fd = mesh.GetFaceDescriptor(si);
int domout = blp.outside ? old_fd.DomainOut() : blp.new_matnrs[layer-1];
int domin = blp.outside ? blp.new_matnrs[layer-1] : old_fd.DomainIn();
FaceDescriptor fd(max_surface_index-1,
domin, domout, -1);
fd.SetBCProperty(max_surface_index);
mesh.AddFaceDescriptor(fd);
return max_surface_index;
}
return last_layer_surface_index_map[si];
};
mesh.UpdateTopology(); mesh.UpdateTopology();
auto& meshtopo = mesh.GetTopology(); auto& meshtopo = mesh.GetTopology();
@ -213,7 +238,7 @@ namespace netgen
} }
if (!blp.grow_edges) if (!blp.grow_edges)
for(const auto& sel : mesh.SurfaceElements()) for(const auto& sel : mesh.LineSegments())
{ {
bndnodes.Clear(sel[0]); bndnodes.Clear(sel[0]);
bndnodes.Clear(sel[1]); bndnodes.Clear(sel[1]);
@ -241,8 +266,6 @@ namespace netgen
} }
growthvectors[pi] += veci; growthvectors[pi] += veci;
} }
// growthvectors[pi].Normalize();
// growthvectors[pi] *= -1.0;
} }
else else
{ {
@ -251,7 +274,6 @@ namespace netgen
} }
} }
// Add quad surface elements at edges for surfaces which // Add quad surface elements at edges for surfaces which
// don't have boundary layers // don't have boundary layers
@ -271,13 +293,15 @@ namespace netgen
// Only go in if the segment is still active, and if both its // Only go in if the segment is still active, and if both its
// surface index is part of the "hit-list" // surface index is part of the "hit-list"
if(segsel.Test(sei) && blp.surfid.Contains(mesh[sei].si)) if(segsel.Test(sei))
{
if(blp.surfid.Contains(mesh[sei].si))
{ {
// clear the bit to indicate that this segment has been processed // clear the bit to indicate that this segment has been processed
segsel.Clear(sei); segsel.Clear(sei);
// Find matching segment pair on other surface // Find matching segment pair on other surface
for (SegmentIndex sej = 0; sej < nseg; sej++) for(SegmentIndex sej = 0; sej < nseg; sej++)
{ {
PointIndex segpair_p1 = mesh[sej][1]; PointIndex segpair_p1 = mesh[sej][1];
PointIndex segpair_p2 = mesh[sej][0]; PointIndex segpair_p2 = mesh[sej][0];
@ -300,34 +324,20 @@ namespace netgen
auto pnt2_elems = meshtopo.GetVertexSurfaceElements(segpair_p2); auto pnt2_elems = meshtopo.GetVertexSurfaceElements(segpair_p2);
for(auto pnt1_sei : pnt1_elems) for(auto pnt1_sei : pnt1_elems)
{ if(mesh[pnt1_sei].GetIndex() == mesh[sej].si)
const auto& pnt1_sel = mesh[pnt1_sei];
for(auto pnt2_sei : pnt2_elems) for(auto pnt2_sei : pnt2_elems)
{ if(pnt1_sei == pnt2_sei)
const Element2d & pnt2_sel = mesh.SurfaceElement(pnt2_sei); pnt_commelem = pnt1_sei;
if((pnt1_sel.GetIndex() == mesh[sej].si)
&& (pnt2_sel.GetIndex() == mesh[sej].si)
&& (pnt1_sei == pnt2_sei))
{
pnt_commelem = pnt1_sei;
}
}
}
const Element2d & commsel = mesh.SurfaceElement(pnt_commelem); if(IsInvalid(pnt_commelem))
throw Exception("Couldn't find element on other side for " + ToString(segpair_p1) + " to " + ToString(segpair_p2));
const auto& commsel = mesh[pnt_commelem];
auto surfelem_vect = GetSurfaceNormal(mesh, commsel); auto surfelem_vect = GetSurfaceNormal(mesh, commsel);
if(blp.outside) if(blp.outside)
surfelem_vect *= -1; surfelem_vect *= -1;
double surfangle = Angle(growthvectors[segpair_p1],surfelem_vect); double surfangle = Angle(growthvectors[segpair_p1],surfelem_vect);
// remap the segments to the new points
if(!blp.outside)
{
mesh[sei][0] = mapto[seg_p1];
mesh[sei][1] = mapto[seg_p2];
mesh[sej][1] = mapto[seg_p1];
mesh[sej][0] = mapto[seg_p2];
}
if((surfangle < (90 + angleThreshold) * 3.141592 / 180.0) if((surfangle < (90 + angleThreshold) * 3.141592 / 180.0)
&& (surfangle > (90 - angleThreshold) * 3.141592 / 180.0)) && (surfangle > (90 - angleThreshold) * 3.141592 / 180.0))
@ -342,109 +352,256 @@ namespace netgen
Element2d sel(QUAD); Element2d sel(QUAD);
if(blp.outside) if(blp.outside)
Swap(seg_p1, seg_p2); Swap(seg_p1, seg_p2);
sel.PNum(4) = mapto[seg_p1]; sel[0] = seg_p1;
sel.PNum(3) = mapto[seg_p2]; sel[1] = seg_p2;
sel.PNum(2) = seg_p2; sel[2] = mapto[seg_p2];
sel.PNum(1) = seg_p1; sel[3] = mapto[seg_p1];
sel.SetIndex(mesh[sej].si); auto domains = make_tuple(commsel.GetIndex(), blp.new_matnrs[layer-1], mesh.GetFaceDescriptor(commsel.GetIndex()).DomainOut());
if(domains_to_surf_index.find(domains) == domains_to_surf_index.end())
{
domains_to_surf_index[domains] = ++max_surface_index;
domains_to_surf_index[make_tuple(max_surface_index, get<1>(domains), get<2>(domains))] = max_surface_index;
FaceDescriptor fd(max_surface_index-1,
get<1>(domains),
get<2>(domains),
-1);
fd.SetBCProperty(max_surface_index);
mesh.AddFaceDescriptor(fd);
mesh.SetBCName(max_surface_index-1,
mesh.GetBCName(get<0>(domains)-1));
}
auto new_index = domains_to_surf_index[domains];
sel.SetIndex(new_index);
mesh.AddSurfaceElement(sel); mesh.AddSurfaceElement(sel);
numquads++; numquads++;
// Add segments
Segment seg_1, seg_2;
seg_1[0] = mapto[seg_p1];
seg_1[1] = seg_p1;
seg_2[0] = seg_p2;
seg_2[1] = mapto[seg_p2];
auto points = make_tuple(seg_p1, mapto[seg_p1]);
if(pi_to_edgenr.find(points) == pi_to_edgenr.end())
pi_to_edgenr[points] = ++max_edge_nr;
seg_1.edgenr = pi_to_edgenr[points];
seg_1[2] = PointIndex::INVALID;
seg_1.si = new_index;
mesh.AddSegment(seg_1);
points = make_tuple(seg_p2, mapto[seg_p2]);
if(pi_to_edgenr.find(points) == pi_to_edgenr.end())
pi_to_edgenr[points] = ++max_edge_nr;
seg_2[2] = PointIndex::INVALID;
seg_2.edgenr = pi_to_edgenr[points];
seg_2.si = new_index;
mesh.AddSegment(seg_2);
mesh[sej].si = new_index;
} }
else else
{ {
for (int k = 0; k < pnt1_elems.Size(); k++) for(auto pnt1_ei : pnt1_elems)
{ {
Element2d & pnt_sel = mesh.SurfaceElement(pnt1_elems[k]); auto& pnt_sel = mesh[pnt1_ei];
if(pnt_sel.GetIndex() == mesh[sej].si) if(pnt_sel.GetIndex() == mesh[sej].si)
{ {
for(int l = 0; l < pnt_sel.GetNP(); l++) for(auto& pi : pnt_sel.PNums())
{ {
if(pnt_sel[l] == segpair_p1) if(pi == segpair_p1)
pnt_sel[l] = mapto[seg_p1]; pi = mapto[seg_p1];
else if (pnt_sel[l] == segpair_p2) else if(pi == segpair_p2)
pnt_sel[l] = mapto[seg_p2]; pi = mapto[seg_p2];
} }
} }
} }
for (int k = 0; k < pnt2_elems.Size(); k++) for(auto sk : pnt2_elems)
{ {
Element2d & pnt_sel = mesh.SurfaceElement(pnt2_elems[k]); auto& pnt_sel = mesh[sk];
if(pnt_sel.GetIndex() == mesh[sej].si) if(pnt_sel.GetIndex() == mesh[sej].si)
{ {
for(int l = 0; l < pnt_sel.GetNP(); l++) for(auto& p : pnt_sel.PNums())
{ {
if(pnt_sel[l] == segpair_p1) if(p == segpair_p1)
pnt_sel[l] = mapto[seg_p1]; p = mapto[seg_p1];
else if (pnt_sel[l] == segpair_p2) else if (p == segpair_p2)
pnt_sel[l] = mapto[seg_p2]; p = mapto[seg_p2];
} }
} }
} }
} }
// }
} }
else
// in last layer insert new segments
if(layer == blp.heights.Size())
{ {
// If the code comes here, it indicates that we are at Segment s1 = mesh[sei];
// a line segment pair which is at the intersection Segment s2 = mesh[sej];
// of two surfaces, both of which have to grow boundary s1.edgenr = ++max_edge_nr;
// layers.... here too, remapping the segments to the s2.edgenr = max_edge_nr;
// new points is required bool create_it = true;
mesh[sei][0] = mapto[seg_p1]; if(blp.surfid.Contains(mesh[sej].si))
mesh[sei][1] = mapto[seg_p2]; {
mesh[sej][1] = mapto[seg_p1]; if(last_layer_surface_index_map.find(s1.si) != last_layer_surface_index_map.end() &&
mesh[sej][0] = mapto[seg_p2]; last_layer_surface_index_map.find(s2.si) != last_layer_surface_index_map.end())
// edge already mapped
create_it = false;
s2.si = map_surface_index(s2.si);
}
else
{
s2.si = domains_to_surf_index[make_tuple(s2.si,
blp.new_matnrs[layer-1], mesh.GetFaceDescriptor(s2.si).DomainOut())];
}
s1.si = map_surface_index(s1.si);
if(create_it)
{
mesh.AddSegment(s1);
mesh.AddSegment(s2);
}
} }
// remap the segments to the new points
mesh[sei][0] = mapto[mesh[sei][0]];
mesh[sei][1] = mapto[mesh[sei][1]];
mesh[sej][1] = mapto[mesh[sej][1]];
mesh[sej][0] = mapto[mesh[sej][0]];
} }
} }
} }
else
{
// check if it doesn't contain the other edge as well
// and if it doesn't contain both mark them as done and
// if necessary map them
for(SegmentIndex sej = 0; sej<nseg; sej++)
{
if(mesh[sej][0] == mesh[sei][1] &&
mesh[sej][1] == mesh[sei][0])
{
if(!blp.surfid.Contains(mesh[sej].si))
{
segsel.Clear(sei);
segsel.Clear(sej);
PointIndex mapped_point = PointIndex::INVALID;
auto p1 = mesh[sei][0];
auto p2 = mesh[sei][1];
if(mapto[p1].IsValid())
mapped_point = p1;
else if(mapto[p2].IsValid())
mapped_point = p2;
else
continue;
auto other_point = mapped_point == p1 ? p2 : p1;
if(growthvectors[mapped_point] * (mesh[other_point] - mesh[mapped_point]) < 0)
{
if(mapto[mesh[sei][0]].IsValid())
mesh[sei][0] = mapto[mesh[sei][0]];
if(mapto[mesh[sei][1]].IsValid())
mesh[sei][1] = mapto[mesh[sei][1]];
if(mapto[mesh[sej][0]].IsValid())
mesh[sej][0] = mapto[mesh[sej][0]];
if(mapto[mesh[sej][1]].IsValid())
mesh[sej][1] = mapto[mesh[sej][1]];
}
}
else
continue;
}
}
}
}
} }
// add surface elements between layer and old domain
if(layer == blp.heights.Size())
{
for(SurfaceElementIndex si = 0; si < nse; si++)
{
if(blp.surfid.Contains(mesh[si].GetIndex()))
{
const auto& sel = mesh[si];
Element2d newel = sel;
newel.SetIndex(map_surface_index(sel.GetIndex()));
mesh.AddSurfaceElement(newel);
}
}
}
// Add prismatic cells at the boundaries // Add prismatic cells at the boundaries
PrintMessage(3, "Generating prism boundary layer volume elements..."); PrintMessage(3, "Generating prism boundary layer volume elements...");
for (SurfaceElementIndex si = 0; si < nse; si++) for (SurfaceElementIndex si = 0; si < nse; si++)
{ {
Element2d & sel = mesh.SurfaceElement(si); const auto& sel = mesh[si];
if(blp.surfid.Contains(sel.GetIndex())) if(blp.surfid.Contains(sel.GetIndex()))
{ {
int classify = 0; int classify = 0;
for (int j = 0; j < 3; j++) for(auto j : Range(sel.PNums()))
if (mapto[sel[j]].IsValid()) if (mapto[sel[j]].IsValid())
classify += (1 << j); classify += (1 << j);
// cout << "classify = " << classify << endl; if(classify == 0)
continue;
ELEMENT_TYPE types[] = { PRISM, TET, TET, PYRAMID, Element el;
TET, PYRAMID, PYRAMID, PRISM };
int nums[] = { sel[0], sel[1], sel[2], mapto[sel[0]], mapto[sel[1]], mapto[sel[2]] };
int vertices[][6] =
{
{ 0, 1, 2, 0, 1, 2 }, // should not occur
{ 0, 2, 1, 3, 0, 0 },
{ 0, 2, 1, 4, 0, 0 },
{ 0, 1, 4, 3, 2, 0 },
{ 0, 2, 1, 5, 0, 0 }, if(sel.GetType() == TRIG)
{ 2, 0, 3, 5, 1, 0 },
{ 1, 2, 5, 4, 0, 0 },
{ 0, 2, 1, 3, 5, 4 }
};
if(blp.outside)
{ {
if(classify != 7) ELEMENT_TYPE types[] = { PRISM, TET, TET, PYRAMID,
throw Exception("Outside with non prisms not yet implemented"); TET, PYRAMID, PYRAMID, PRISM };
for(auto i : Range(6)) int nums[] = { sel[0], sel[1], sel[2], mapto[sel[0]], mapto[sel[1]], mapto[sel[2]] };
vertices[7][i] = i; int vertices[][6] =
{
{ 0, 1, 2, 0, 1, 2 }, // should not occur
{ 0, 2, 1, 3, 0, 0 },
{ 0, 2, 1, 4, 0, 0 },
{ 0, 1, 4, 3, 2, 0 },
{ 0, 2, 1, 5, 0, 0 },
{ 2, 0, 3, 5, 1, 0 },
{ 1, 2, 5, 4, 0, 0 },
{ 0, 2, 1, 3, 5, 4 }
};
if(blp.outside)
{
if(classify != 7)
throw Exception("Outside with non prisms not yet implemented");
for(auto i : Range(6))
vertices[7][i] = i;
}
el = Element(types[classify]);
for(auto i : Range(el.PNums()))
el.PNums()[i] = nums[vertices[classify][i]];
}
else // sel.GetType() == QUAD
{
int nums[] = { sel[0], sel[1], sel[2], sel[3],
mapto[sel[0]], mapto[sel[1]],
mapto[sel[2]], mapto[sel[3]] };
if(classify == 15)
{
int vertices[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
if(!blp.outside)
{
Swap(vertices[1], vertices[3]);
Swap(vertices[5], vertices[7]);
}
el = Element(HEX);
for(auto i : Range(el.PNums()))
el.PNums()[i] = nums[vertices[i]];
}
else
{
throw Exception("This type of quad layer not yet implemented!");
}
} }
Element el(types[classify]);
for (int i = 0; i < 6; i++)
el[i] = nums[vertices[classify][i]];
el.SetIndex(blp.new_matnrs[layer-1]); el.SetIndex(blp.new_matnrs[layer-1]);
if (classify != 0) mesh.AddVolumeElement(el);
mesh.AddVolumeElement(el);
} }
} }
@ -455,8 +612,16 @@ namespace netgen
for(SurfaceElementIndex sei : Range(nse)) for(SurfaceElementIndex sei : Range(nse))
{ {
auto& sel = mesh[sei]; auto& sel = mesh[sei];
if((blp.outside && !blp.surfid.Contains(sel.GetIndex())) || bool to_move = blp.surfid.Contains(sel.GetIndex());
(!blp.outside && blp.surfid.Contains(sel.GetIndex()))) if(blp.domains.Size())
{
if(blp.outside)
to_move |= blp.domains[mesh.GetFaceDescriptor(sel.GetIndex()).DomainIn()];
else
to_move |= !blp.domains[mesh.GetFaceDescriptor(sel.GetIndex()).DomainIn()];
}
if(to_move)
{ {
for(auto& pnum : sel.PNums()) for(auto& pnum : sel.PNums())
// Check (Doublecheck) if the corresponding point has a // Check (Doublecheck) if the corresponding point has a
@ -467,17 +632,18 @@ namespace netgen
} }
} }
if(blp.outside) for(ElementIndex ei : Range(ne))
for(ElementIndex ei : Range(ne)) {
{ auto& el = mesh[ei];
auto& el = mesh[ei]; bool to_move = blp.outside ? blp.domains[el.GetIndex()] : !blp.domains[el.GetIndex()];
if(blp.domains.Size() == 0 || to_move)
for(auto& pnum : el.PNums()) for(auto& pnum : el.PNums())
// Check (Doublecheck) if the corresponding point has a // Check (Doublecheck) if the corresponding point has a
// copy available for remapping // copy available for remapping
if(mapto[pnum].IsValid()) if(mapto[pnum].IsValid())
// Map the surface elements to the new points // Map the volume elements to the new points
pnum = mapto[pnum]; pnum = mapto[pnum];
} }
// Lock all the prism points so that the rest of the mesh can be // Lock all the prism points so that the rest of the mesh can be
// optimised without invalidating the entire mesh // optimised without invalidating the entire mesh
@ -494,7 +660,6 @@ namespace netgen
if(bndnodes.Test(i)) if(bndnodes.Test(i))
{ {
MeshPoint pointtomove; MeshPoint pointtomove;
pointtomove = mesh.Point(i); pointtomove = mesh.Point(i);
mesh.Point(i).SetPoint(pointtomove + layerht * growthvectors[i]); mesh.Point(i).SetPoint(pointtomove + layerht * growthvectors[i]);
} }
@ -505,12 +670,12 @@ namespace netgen
for(int i=1; i <= mesh.GetNFD(); i++) for(int i=1; i <= mesh.GetNFD(); i++)
{ {
auto& fd = mesh.GetFaceDescriptor(i); auto& fd = mesh.GetFaceDescriptor(i);
if(blp.surfid.Contains(fd.SurfNr())) if(blp.surfid.Contains(fd.BCProperty()))
{ {
if(blp.outside) if(blp.outside)
fd.SetDomainOut(blp.new_matnrs[0]); fd.SetDomainOut(blp.new_matnrs[blp.new_matnrs.Size()-1]);
else else
fd.SetDomainIn(blp.new_matnrs[0]); fd.SetDomainIn(blp.new_matnrs[blp.new_matnrs.Size()-1]);
} }
} }

1
libsrc/meshing/boundarylayer.hpp
View File

@ -15,6 +15,7 @@ public:
Array<int> surfid; Array<int> surfid;
Array<double> heights; Array<double> heights;
Array<size_t> new_matnrs; Array<size_t> new_matnrs;
BitArray domains;
bool outside = false; // set the boundary layer on the outside bool outside = false; // set the boundary layer on the outside
bool grow_edges = false; bool grow_edges = false;
}; };

41
libsrc/meshing/python_mesh.cpp
View File

@ -966,12 +966,12 @@ DLL_HEADER void ExportNetgenMeshing(py::module &m)
auto prismlayers = blp.heights.Size(); auto prismlayers = blp.heights.Size();
auto first_new_mat = self.GetNDomains() + 1; auto first_new_mat = self.GetNDomains() + 1;
for(auto i : Range(prismlayers)) auto max_dom_nr = first_new_mat;
blp.new_matnrs.Append(first_new_mat + i);
if(string* pmaterial = get_if<string>(&material); pmaterial) if(string* pmaterial = get_if<string>(&material); pmaterial)
{ {
self.SetMaterial(first_new_mat, *pmaterial);
for(auto i : Range(prismlayers)) for(auto i : Range(prismlayers))
self.SetMaterial(first_new_mat + i, *pmaterial); blp.new_matnrs.Append(first_new_mat);
} }
else else
{ {
@ -979,16 +979,41 @@ DLL_HEADER void ExportNetgenMeshing(py::module &m)
if(py::len(materials) != prismlayers) if(py::len(materials) != prismlayers)
throw Exception("Length of thicknesses and materials must be same!"); throw Exception("Length of thicknesses and materials must be same!");
for(auto i : Range(prismlayers)) for(auto i : Range(prismlayers))
self.SetMaterial(first_new_mat + i, materials[i].cast<string>()); {
self.SetMaterial(first_new_mat+i, materials[i].cast<string>());
blp.new_matnrs.Append(first_new_mat + i);
}
max_dom_nr += prismlayers-1;
} }
blp.domains.SetSize(max_dom_nr + 1); // one based
blp.domains.Clear();
if(string* pdomain = get_if<string>(&domain); pdomain)
{
regex pattern(*pdomain);
for(auto i : Range(1, first_new_mat))
if(regex_match(self.GetMaterial(i), pattern))
blp.domains.SetBit(i);
}
else
{
auto idomain = *get_if<int>(&domain);
blp.domains.SetBit(idomain);
}
// bits for new domains must be set
if(!outside)
for(auto i : Range(first_new_mat, max_dom_nr+1))
blp.domains.SetBit(i);
blp.outside = outside; blp.outside = outside;
blp.grow_edges = grow_edges; blp.grow_edges = grow_edges;
GenerateBoundaryLayer (self, blp); GenerateBoundaryLayer (self, blp);
self.UpdateTopology();
}, py::arg("boundary"), py::arg("thickness"), py::arg("material"), }, py::arg("boundary"), py::arg("thickness"), py::arg("material"),
py::arg("domain") = 1, py::arg("outside") = false, py::arg("domains") = ".*", py::arg("outside") = false,
py::arg("grow_edges") = false, R"delimiter( py::arg("grow_edges") = false,
R"delimiter(
Add boundary layer to mesh. Add boundary layer to mesh.
Parameters Parameters
@ -1003,8 +1028,8 @@ thickness : float or List[float]
material : str or List[str] material : str or List[str]
Material name of boundary layer(s). Material name of boundary layer(s).
domain : string or int domain : str or int
Add layer into domain specified by name or number. Regexp for domain boundarylayer is going into.
outside : bool = False outside : bool = False
If true add the layer on the outside If true add the layer on the outside

26
tests/pytest/test_boundarylayer.py
View File

@ -2,16 +2,30 @@
import pytest import pytest
from netgen.csg import * from netgen.csg import *
def GetNSurfaceElements(mesh, boundary):
nse_in_layer = 0
for el in mesh.Elements2D():
print(el.index)
if mesh.GetBCName(el.index-1) == boundary:
nse_in_layer += 1
return nse_in_layer
@pytest.mark.parametrize("outside", [True, False]) @pytest.mark.parametrize("outside", [True, False])
def test_boundarylayer(outside): def test_boundarylayer(outside, capfd):
mesh = unit_cube.GenerateMesh(maxh=0.3) mesh = unit_cube.GenerateMesh(maxh=0.3)
ne_before = mesh.ne ne_before = mesh.ne
nse_in_layer = 0
layer_surfacenames = ["right", "top"] layer_surfacenames = ["right", "top"]
for el in mesh.Elements2D():
if mesh.GetBCName(el.index-1) in layer_surfacenames:
nse_in_layer += 1
mesh.BoundaryLayer("|".join(layer_surfacenames), [0.01, 0.02], "layer", outside=outside, grow_edges=True) mesh.BoundaryLayer("|".join(layer_surfacenames), [0.01, 0.02], "layer", outside=outside, grow_edges=True)
assert mesh.ne == ne_before + 2 * nse_in_layer
should_ne = ne_before + 2 * sum([GetNSurfaceElements(mesh, surf) for surf in layer_surfacenames])
assert mesh.ne == should_ne
capture = capfd.readouterr()
assert not "elements are not matching" in capture.out
for side in ["front"]:
mesh.BoundaryLayer(side, [0.001], "layer", outside=outside, grow_edges=True)
should_ne += GetNSurfaceElements(mesh, side)
assert mesh.ne == should_ne
capture = capfd.readouterr()
assert not "elements are not matching" in capture.out