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add function to automatically create pml layer around convex 2d geometries

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This commit is contained in:
Christopher Lackner 2019-01-23 10:35:20 +01:00
parent 0247b92a8a
commit 05f22e463d
4 changed files with 124 additions and 26 deletions
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1
libsrc/geom2d/geometry2d.hpp
View File

@ -175,6 +175,7 @@ namespace netgen
void CopyEdgeMesh (int from, int to, Mesh & mesh2d, Point3dTree & searchtree);
size_t GetNDomains() const { return materials.Size(); }
void GetMaterial (int domnr, char* & material );
void SetMaterial (int domnr, const string & material);

49
libsrc/geom2d/python_geom2d.cpp
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@ -15,6 +15,22 @@ namespace netgen
DLL_HEADER void ExportGeom2d(py::module &m)
{
py::class_<SplineSegExt, shared_ptr<SplineSegExt>>
(m, "Spline", "Spline of a SplineGeometry object")
.def_property("leftdom", [] (SplineSegExt& self) { return self.leftdom; },
[](SplineSegExt& self, int dom) { self.leftdom = dom; })
.def_property("rightdom", [] (SplineSegExt& self) { return self.rightdom; },
[](SplineSegExt& self, int dom) { self.rightdom = dom; })
.def_property_readonly("bc", [] (SplineSegExt& self) { return self.bc; })
.def("GetNormal", [](SplineSegExt& self, double t)
{
auto tang = self.GetTangent(t).Normalize();
return Vec<2>(tang[1], -tang[0]);
})
.def("StartPoint", [](SplineSegExt& self) { return Point<2>(self.StartPI()); })
.def("EndPoint", [](SplineSegExt& self) { return Point<2>(self.EndPI()); })
;
py::class_<SplineGeometry2d, NetgenGeometry, shared_ptr<SplineGeometry2d>>
(m, "SplineGeometry",
"a 2d boundary representation geometry model by lines and splines",
@ -121,38 +137,21 @@ DLL_HEADER void ExportGeom2d(py::module &m)
seg->copyfrom = -1;
self.AppendSegment(seg);
}), py::arg("point_indices"), py::arg("leftdomain") = 1, py::arg("rightdomain") = py::int_(0))
//.def("AppendSegment", FunctionPointer([](SplineGeometry2d &self, int point_index1, int point_index2)//, int leftdomain, int rightdomain)
// {
// LineSeg<2> * l = new LineSeg<2>(self.GetPoint(point_index1), self.GetPoint(point_index2));
// SplineSegExt * seg = new SplineSegExt(*l);
// seg->leftdom = 1;// leftdomain;
// seg->rightdom = 0;// rightdomain;
// seg->hmax = 1e99;
// seg->reffak = 1;
// seg->copyfrom = -1;
// self.AppendSegment(seg);
// }))//, (py::arg("self"), py::arg("point_index1"), py::arg("point_index2"), py::arg("leftdomain") = 1, py::arg("rightdomain") = 0) )
//.def("AppendSegment", FunctionPointer([](SplineGeometry2d &self, int point_index1, int point_index2, int point_index3)//, int leftdomain, int rightdomain)
// {
// SplineSeg3<2> * seg3 = new SplineSeg3<2>(self.GetPoint(point_index1), self.GetPoint(point_index2), self.GetPoint(point_index3));
// SplineSegExt * seg = new SplineSegExt(*seg3);
// seg->leftdom = 1;// leftdomain;
// seg->rightdom = 0;// rightdomain;
// seg->hmax = 1e99;
// seg->reffak = 1;
// seg->copyfrom = -1;
// self.AppendSegment(seg);
// }))//, (py::arg("self"), py::arg("point_index1"), py::arg("point_index2"), py::arg("point_index3"), py::arg("leftdomain") = 1, py::arg("rightdomain") = 0 ) )
.def("SetMaterial", &SplineGeometry2d::SetMaterial)
.def("SetDomainMaxH", &SplineGeometry2d::SetDomainMaxh)
.def("GetBCName", [](SplineGeometry2d& self, size_t index) { return self.GetBCName(index); })
.def("GetNDomains", [](SplineGeometry2d& self) { return self.GetNDomains(); })
.def("GetNSplines", [](SplineGeometry2d& self) { return self.splines.Size(); })
.def("GetSpline", [](SplineGeometry2d& self, size_t index)
{ return shared_ptr<SplineSegExt>(&self.GetSpline(index), NOOP_Deleter); },
py::return_value_policy::reference_internal)
.def("GetNPoints", [](SplineGeometry2d& self) { return self.GetNP(); })
.def("GetPoint", [](SplineGeometry2d& self, size_t index) { return Point<2>(self.GetPoint(index)); })
.def("PlotData", FunctionPointer([](SplineGeometry2d &self)
{
Box<2> box(self.GetBoundingBox());

2
libsrc/meshing/python_mesh.cpp
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@ -80,6 +80,7 @@ DLL_HEADER void ExportNetgenMeshing(py::module &m)
.def(py::self-py::self)
.def(py::self+Vec<2>())
.def(py::self-Vec<2>())
.def("__getitem__", [](Point<2>& self, int index) { return self[index]; })
;
py::class_<Point<3>> (m, "Point3d")
@ -88,6 +89,7 @@ DLL_HEADER void ExportNetgenMeshing(py::module &m)
.def(py::self-py::self)
.def(py::self+Vec<3>())
.def(py::self-Vec<3>())
.def("__getitem__", [](Point<2>& self, int index) { return self[index]; })
;
m.def ("Pnt", FunctionPointer

98
python/geom2d.py
View File

@ -39,11 +39,107 @@ def MakeCircle (geo, c, r, **args):
geo.Append( ["spline3", pts[p1], pts[p2], pts[p3]], **args)
def CreatePML(geo, pml_size, tol=1e-12):
"""Create a pml layer around the geometry. This function works only on convex geometries and
the highest existing domain number must be named by using the function geo.SetMaterial(domnr, name).
Points in the geometry are assumed to be the same if (pt1 - pt2).Norm() < tol.
Returned is a dict with information to create the pml layer:
normals: A dict from the names of the linear pml domains to the normal vectors pointing inside the pml."""
def Start(spline):
if spline.rightdom == 0:
return spline.StartPoint()
return spline.EndPoint()
def End(spline):
if spline.rightdom == 0:
return spline.EndPoint()
return spline.StartPoint()
splines = []
for i in range(geo.GetNSplines()):
splines.append(geo.GetSpline(i))
border = []
is_closed = False
current_endpoint = None
while not is_closed:
for spline in splines:
if spline.leftdom == 0 or spline.rightdom == 0:
if current_endpoint is not None:
if (Start(spline)-current_endpoint).Norm() < tol:
border.append(spline)
current_endpoint = End(spline)
if (current_endpoint - startpoint).Norm() < tol:
is_closed = True
break
else:
startpoint = Start(spline)
current_endpoint = End(spline)
border.append(spline)
break
else:
raise Exception("Couldn't find closed spline around domain")
endpointindex_map = []
for spline in border:
pnt = End(spline)
for i in range(geo.GetNPoints()):
if (pnt - geo.GetPoint(i)).Norm() < tol:
endpointindex_map.append(i)
break
else:
raise Exception("Couldn't find endpoint of spline in geometry")
start_ndoms = ndoms = geo.GetNDomains() + 1
new_spline_domains = []
normals = {}
for i, spline in enumerate(border):
if i == 0:
global_start = Start(spline) + pml_size * spline.GetNormal(0)
global_start_pnt = current_start = geo.AppendPoint(global_start[0], global_start[1])
next_spline = border[(i+1)%len(border)]
new_end = End(spline) + pml_size * spline.GetNormal(1)
spline_name = geo.GetBCName(spline.bc)
if (new_end - global_start).Norm() < tol:
new_spline_domains.append(ndoms)
geo.Append(["line", current_start, global_start_pnt], bc="outer_" + spline_name, leftdomain = ndoms)
geo.Append(["line", global_start_pnt, endpointindex_map[i]], leftdomain=ndoms, rightdomain=start_ndoms)
geo.SetMaterial(ndoms, "pml_" + spline_name)
normals["pml_" + spline_name] = spline.GetNormal(0)
ndoms += 1
break
end = geo.AppendPoint(new_end[0], new_end[1])
new_spline_domains.append(ndoms)
geo.Append(["line", current_start, end], bc="outer_" + spline_name, leftdomain = ndoms)
geo.Append(["line", end, endpointindex_map[i]], leftdomain=ndoms, rightdomain=ndoms+1)
geo.SetMaterial(ndoms, "pml_" + spline_name)
normals["pml_" + spline_name] = spline.GetNormal(0)
ndoms += 1
new_start = Start(next_spline) + pml_size * next_spline.GetNormal(0)
if (new_start - global_start).Norm() < tol:
geo.Append(["line", end, global_start_pnt], bc="outer", leftdomain = ndoms)
geo.Append(["line", global_start_pnt, endpointindex_map[i]], leftdomain=ndoms, rightdomain=start_ndoms)
geo.SetMaterial(ndoms, "pml_corner")
ndoms += 1
break
if (new_end - new_start).Norm() < tol:
current_start = end
else:
current_start = geo.AppendPoint(new_start[0], new_start[1])
geo.Append(["line", end, current_start], bc="outer", leftdomain = ndoms)
geo.Append(["line", current_start, endpointindex_map[i]], leftdomain=ndoms, rightdomain=ndoms+1)
geo.SetMaterial(ndoms, "pml_corner")
ndoms += 1
for spline, domnr in zip(border, new_spline_domains):
if spline.leftdom == 0:
spline.leftdom = domnr
else:
spline.rightdom = domnr
return {"normals" : normals}
SplineGeometry.AddCircle = lambda geo, c, r, **args : MakeCircle(geo, c, r, **args)
SplineGeometry.AddRectangle = lambda geo, p1, p2, **args : MakeRectangle(geo, p1, p2, **args)
SplineGeometry.AddSegment = lambda *args, **kwargs : SplineGeometry.Append(*args, **kwargs)
SplineGeometry.AddPoint = lambda *args, **kwargs : SplineGeometry.AppendPoint(*args, **kwargs)
SplineGeometry.CreatePML = CreatePML
__all__ = ['SplineGeometry', 'unit_square']