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Merge branch 'hpref_surface_geom' into 'master'

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add hp refinement possibility for surface geometry

See merge request jschoeberl/netgen!344
This commit is contained in:
Joachim Schöberl 2020-11-06 11:21:19 +00:00
commit f97601bca2
3 changed files with 124 additions and 32 deletions
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24
libsrc/meshing/python_mesh.cpp
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@ -1252,27 +1252,45 @@ grow_edges : bool = False
}), py::arg("mapping"))
.def(NGSPickle<SurfaceGeometry>())
.def("GenerateMesh", [](shared_ptr<SurfaceGeometry> geo,
bool quads, int nx, int ny, bool flip_triangles, py::list py_bbbpts, py::list py_bbbnames)
bool quads, int nx, int ny, bool flip_triangles, py::list py_bbbpts, py::list py_bbbnames, py::list py_hppts, py::list py_hpbnd)
{
if (py::len(py_bbbpts) != py::len(py_bbbnames))
throw Exception("In SurfaceGeometry::GenerateMesh bbbpts and bbbnames do not have same lengths.");
Array<Point<3>> bbbpts(py::len(py_bbbpts));
Array<string> bbbname(py::len(py_bbbpts));
Array<Point<3>> hppts(py::len(py_hppts));
Array<float> hpptsfac(py::len(py_hppts));
Array<string> hpbnd(py::len(py_hpbnd));
Array<float> hpbndfac(py::len(py_hpbnd));
for(int i = 0; i<py::len(py_bbbpts);i++)
{
py::tuple pnt = py::extract<py::tuple>(py_bbbpts[i])();
bbbpts[i] = Point<3>(py::extract<double>(pnt[0])(),py::extract<double>(pnt[1])(),py::extract<double>(pnt[2])());
bbbname[i] = py::extract<string>(py_bbbnames[i])();
}
for(int i = 0; i<py::len(py_hppts);i++)
{
py::tuple pnt = py::extract<py::tuple>(py_hppts[i])();
hppts[i] = Point<3>(py::extract<double>(pnt[0])(),py::extract<double>(pnt[1])(),py::extract<double>(pnt[2])());
//hpptsfac[i] = py::len(pnt) > 3 ? py::extract<double>(pnt[3])() : 0.0;
hpptsfac[i] = py::extract<double>(pnt[3])();
}
for(int i = 0; i<py::len(py_hpbnd);i++)
{
py::tuple bnd = py::extract<py::tuple>(py_hpbnd[i])();
hpbnd[i] = py::extract<string>(bnd[0])();
hpbndfac[i] = py::extract<double>(bnd[1])();
}
auto mesh = make_shared<Mesh>();
SetGlobalMesh (mesh);
mesh->SetGeometry(geo);
ng_geometry = geo;
auto result = geo->GenerateMesh (mesh, quads, nx, ny, flip_triangles, bbbpts, bbbname);
auto result = geo->GenerateMesh (mesh, quads, nx, ny, flip_triangles, bbbpts, bbbname, hppts, hpptsfac, hpbnd, hpbndfac);
if(result != 0)
throw Exception("SurfaceGeometry: Meshing failed!");
return mesh;
}, py::arg("quads")=true, py::arg("nx")=10, py::arg("ny")=10, py::arg("flip_triangles")=false, py::arg("bbbpts")=py::list(), py::arg("bbbnames")=py::list())
}, py::arg("quads")=true, py::arg("nx")=10, py::arg("ny")=10, py::arg("flip_triangles")=false, py::arg("bbbpts")=py::list(), py::arg("bbbnames")=py::list(), py::arg("hppts")=py::list(), py::arg("hpbnd")=py::list())
;
;

127
libsrc/meshing/surfacegeom.cpp
View File

@ -45,10 +45,10 @@ namespace netgen
prr = p[1]+2*eps;
pll = p[1]-2*eps;
dr = GetTangentVectors(u, pr);
dl = GetTangentVectors(u, pl);
drr = GetTangentVectors(u, prr);
dll = GetTangentVectors(u, pll);
GetTangentVectors(u, pr, dr);
GetTangentVectors(u, pl, dl);
GetTangentVectors(u, prr, drr);
GetTangentVectors(u, pll, dll);
f_vv = (1.0/(12.0*eps)) * (8.0*dr[1]-8.0*dl[1]-drr[1]+dll[1]);
}
@ -74,11 +74,31 @@ namespace netgen
return tang;
}
void SurfaceGeometry :: GetTangentVectors(double u, double v, Array<Vec<3>>& tang) const
{
Point<2> pru = Point<2>(u+eps,v);
Point<2> plu = Point<2>(u-eps,v);
Point<2> prru = Point<2>(u+2*eps,v);
Point<2> pllu = Point<2>(u-2*eps,v);
Point<2> prv = Point<2>(u,v+eps);
Point<2> plv = Point<2>(u,v-eps);
Point<2> prrv = Point<2>(u,v+2*eps);
Point<2> pllv = Point<2>(u,v-2*eps);
tang[0] = 1/(12.0*eps)*( 8.0*func(pru) - 8.0*func(plu) - func(prru) + func(pllu) );
tang[1] = 1/(12.0*eps)*( 8.0*func(prv) - 8.0*func(plv) - func(prrv) + func(pllv) );
}
Vec<3> SurfaceGeometry :: GetNormal(int surfind, const Point<3> & p, const PointGeomInfo* gi) const
{
Array<Vec<3>> tang = GetTangentVectors(gi->u, gi->v);
auto normal = Cross(tang[0], tang[1]);
return Cross(tang[0], tang[1]);
normal.Normalize();
return normal;
}
@ -97,14 +117,13 @@ namespace netgen
bool SurfaceGeometry :: ProjectPointGI (int surfind, Point<3> & p, PointGeomInfo & gi) const
{
Array<Vec<3>> tangs;
Array<Vec<3>> tangs(2);
Vec<3> diff, f_uu, f_vv, f_uv;
Vec<2> r, dx;
double norm_r, det, energy=0.0, new_energy=0.0, alpha=2.0,u=0.0,v=0.0;
double norm_r, det, energy=0.0, new_energy=0.0, alpha=2.0,u=0.0,v=0.0,maxerr=1e-16;
Mat<2,2> mat, inv;
int num=0, maxit=20;
double damping=0.2;
int num=0, maxit=25;
double damping=0.5;
//Solve minimization problem
// argmin_(u,v) 0.5*\| f(u,v)-p\|^2
@ -115,7 +134,7 @@ namespace netgen
do
{
num++;
tangs = GetTangentVectors(gi.u, gi.v);
GetTangentVectors(gi.u, gi.v,tangs);
diff = func(Point<2>(gi.u, gi.v)) - Vec<3>(p);
energy = diff.Length2();
r = Vec<2>( diff*tangs[0], diff*tangs[1] );
@ -146,12 +165,13 @@ namespace netgen
while (alpha > 1e-10 && new_energy > energy+1e-14);
if (alpha <= 1e-10)
throw Exception("In SurfaceGeometry::ProjectPointGI: Linesearch min alpha reached!");
gi.u = u;
gi.v = v;
}
while ( norm_r > 1e-12 && num < maxit);
while ( norm_r > maxerr && num < maxit);
//Stay in reference domain [0,1]^2
if (gi.u < 0 || gi.u > 1 || gi.v < 0 || gi.v > 1)
@ -179,19 +199,13 @@ namespace netgen
void SurfaceGeometry :: PointBetweenEdge(const Point<3> & p1, const Point<3> & p2, double secpoint, int surfi1, int surfi2, const EdgePointGeomInfo & ap1, const EdgePointGeomInfo & ap2, Point<3> & newp, EdgePointGeomInfo & newgi) const
{
newp = p1+secpoint*(p2-p1);
PointGeomInfo pgi;
pgi.u = ap1.u+secpoint*(ap2.u-ap1.u);
pgi.v = ap1.v+secpoint*(ap2.v-ap1.v);
ProjectPointGI(surfi1, newp, pgi);
newgi.u = pgi.u;
newgi.v = pgi.v;
newgi.u = ap1.u+secpoint*(ap2.u-ap1.u);
newgi.v = ap1.v+secpoint*(ap2.v-ap1.v);
newgi.edgenr = ap1.edgenr;
newgi.body = -1;
newgi.dist = -1.0;
newp = Point<3>(func(Point<2>(newgi.u, newgi.v)));
}
void SurfaceGeometry :: PointBetween(const Point<3> & p1, const Point<3> & p2, double secpoint,
@ -200,16 +214,16 @@ namespace netgen
const PointGeomInfo & gi2,
Point<3> & newp, PointGeomInfo & newgi) const
{
newp = p1+secpoint*(p2-p1);
newgi.u = gi1.u+secpoint*(gi2.u-gi1.u);
newgi.v = gi1.v+secpoint*(gi2.v-gi1.v);
newgi.trignum = -1;
ProjectPointGI(surfi, newp, newgi);
newp = Point<3>(func(Point<2>(newgi.u, newgi.v)));
//newp = p1+secpoint*(p2-p1);
//ProjectPointGI(surfi, newp, newgi);
}
int SurfaceGeometry :: GenerateMesh(shared_ptr<Mesh> & mesh, bool quads, int nx, int ny, bool flip_triangles, const Array<Point<3>>& bbbpts, const Array<string>& bbbnames)
int SurfaceGeometry :: GenerateMesh(shared_ptr<Mesh> & mesh, bool quads, int nx, int ny, bool flip_triangles, const Array<Point<3>>& bbbpts, const Array<string>& bbbnames, const Array<Point<3>>& hppoints, const Array<float>& hpptsfac, const Array<string>& hpbnd, const Array<float>& hpbndfac)
{
mesh->SetDimension(3);
@ -241,6 +255,16 @@ namespace netgen
indbbbpts[k] = pids[pids.Size()-1];
}
}
for (int k = 0; k < hppoints.Size(); k++)
{
auto diff = pnt - hppoints[k];
if(diff.Length2() < 1e-14)
{
(*mesh)[pids[pids.Size()-1]].Singularity(hpptsfac[k]);
}
}
}
for (bool f : found)
@ -318,8 +342,19 @@ namespace netgen
Segment seg;
seg.si = 1;
seg.edgenr = 1;
seg.epgeominfo[0].edgenr = 1;
seg.epgeominfo[1].edgenr = 1;
seg.epgeominfo[0].edgenr = 0;
seg.epgeominfo[1].edgenr = 0;
//for hp refinement
seg.singedge_left = 0;
seg.singedge_right = 0;
for (size_t i=0; i < hpbnd.Size(); i++)
{
if (hpbnd[i] == "bottom")
{
seg.singedge_left = hpbndfac[i];
seg.singedge_right = hpbndfac[i];
}
}
// needed for codim2 in 3d
seg.edgenr = 1;
for(int i=0; i < nx; i++)
@ -341,6 +376,18 @@ namespace netgen
seg.si = 2;
seg.edgenr = 2;
seg.singedge_left = 0;
seg.singedge_right = 0;
for (size_t i=0; i < hpbnd.Size(); i++)
{
if (hpbnd[i] == "right")
{
seg.singedge_left = hpbndfac[i];
seg.singedge_right = hpbndfac[i];
}
}
for(int i=0; i<ny; i++)
{
seg[0] = pids[i*(nx+1)+nx];
@ -360,6 +407,18 @@ namespace netgen
seg.si = 3;
seg.edgenr = 3;
seg.singedge_left = 0;
seg.singedge_right = 0;
for (size_t i=0; i < hpbnd.Size(); i++)
{
if (hpbnd[i] == "top")
{
seg.singedge_left = hpbndfac[i];
seg.singedge_right = hpbndfac[i];
}
}
for(int i=0; i<nx; i++)
{
seg[0] = pids[ny*(nx+1)+i+1];
@ -379,6 +438,18 @@ namespace netgen
seg.si = 4;
seg.edgenr = 4;
seg.singedge_left = 0;
seg.singedge_right = 0;
for (size_t i=0; i < hpbnd.Size(); i++)
{
if (hpbnd[i] == "left")
{
seg.singedge_left = hpbndfac[i];
seg.singedge_right = hpbndfac[i];
}
}
for(int i=0; i<ny; i++)
{
seg[0] = pids[(i+1)*(nx+1)];

5
libsrc/meshing/surfacegeom.hpp
View File

@ -36,6 +36,9 @@ namespace netgen
Array<Vec<3>> GetTangentVectors(double u, double v) const;
void GetTangentVectors(double u, double v, Array<Vec<3>>& tang) const;
virtual Vec<3> GetNormal(int surfind, const Point<3> & p, const PointGeomInfo* gi) const override;
virtual PointGeomInfo ProjectPoint(int surfind, Point<3> & p) const override;
@ -59,7 +62,7 @@ namespace netgen
const PointGeomInfo & gi2,
Point<3> & newp, PointGeomInfo & newgi) const override;
int GenerateMesh(shared_ptr<Mesh> & mesh, bool quads, int nx, int ny, bool flip_triangles, const Array<Point<3>>& bbbpts, const Array<string>& bbbnames);
int GenerateMesh(shared_ptr<Mesh> & mesh, bool quads, int nx, int ny, bool flip_triangles, const Array<Point<3>>& bbbpts, const Array<string>& bbbnames, const Array<Point<3>>& hppoints, const Array<float>& hpptsfac, const Array<string>& hpbnd, const Array<float>& hpbndfac);
};