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* Not worked on it for too long.... commit for continuing work in the future... Note: Does not effect any other parts of Netgen!

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This commit is contained in:
Philippose Rajan 2011-02-13 16:56:44 +00:00
parent 49378768b4
commit 789b56179e
1 changed files with 34 additions and 15 deletions
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49
libsrc/meshing/boundarylayer.cpp
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@ -145,10 +145,12 @@ namespace netgen
{
int i, j;
ofstream dbg("BndLayerDebug.log");
// Angle between a surface element and a growth-vector below which
// a prism is project onto that surface as a quad
// (in degrees)
double angleThreshold = 15.0;
double angleThreshold = 5.0;
cout << "Generate Prismatic Boundary Layers (Experimental)...." << endl;
@ -190,7 +192,7 @@ namespace netgen
cout << "Enter layer growth / shrink factor: ";
cin >> growthfactor;
if(growthfactor <= 0.0) growthfactor = 1.0;
if(growthfactor <= 0.0) growthfactor = 0.5;
cout << "Old NP: " << mesh.GetNP() << endl;
cout << "Old NSE: " << mesh.GetNSE() << endl;
@ -199,6 +201,11 @@ namespace netgen
{
cout << "Generating layer: " << layer << endl;
const MeshTopology& meshtopo = mesh.GetTopology();
const_cast<MeshTopology &> (meshtopo).SetBuildEdges(true);
const_cast<MeshTopology &> (meshtopo).SetBuildFaces(true);
const_cast<MeshTopology &> (meshtopo).Update();
double layerht = hfirst;
if(growthfactor == 1)
@ -222,11 +229,6 @@ namespace netgen
// consistency
int nseg = mesh.GetNSeg();
// Update the mesh topology structures
mesh.UpdateTopology();
const MeshTopology& meshtopo = mesh.GetTopology();
// Indicate which points need to be remapped
BitArray bndnodes(np);
@ -296,6 +298,7 @@ namespace netgen
else
{
mapto.Elem(i) = 0;
growthvectors.Elem(i) = Vec3d(0,0,0);
}
}
@ -372,17 +375,28 @@ namespace netgen
}
}
Vec3d surfelem_vect1, surfelem_vect2, surfelem_vect;
Vec3d surfelem_vect, surfelem_vect1;
surfelem_vect1 = mesh.Point(pnum_commelem) - mesh.Point(segpair_p1);
surfelem_vect2 = mesh.Point(pnum_commelem) - mesh.Point(segpair_p2);
surfelem_vect1.Normalize();
surfelem_vect2.Normalize();
surfelem_vect = surfelem_vect1 + surfelem_vect2;
Element2d & commsel = mesh.SurfaceElement(pnt_commelem);
dbg << "NP= " << commsel.GetNP() << " : ";
for(int k = 1; k <= commsel.GetNP(); k++)
{
GetSurfaceNormal(mesh,commsel,k,surfelem_vect1);
surfelem_vect += surfelem_vect1;
}
surfelem_vect.Normalize();
double surfangle = Angle(growthvectors.Elem(segpair_p1),surfelem_vect);
dbg << "V1= " << surfelem_vect1
<< " : V2= " << surfelem_vect1
<< " : V= " << surfelem_vect
<< " : GV= " << growthvectors.Elem(segpair_p1)
<< " : Angle= " << surfangle * 180 / 3.141592;
// remap the segments to the new points
mesh.LineSegment(i)[0] = mapto.Get(seg_p1);
@ -390,12 +404,14 @@ namespace netgen
mesh.LineSegment(j)[1] = mapto.Get(seg_p1);
mesh.LineSegment(j)[0] = mapto.Get(seg_p2);
if(surfangle <= angleThreshold * 3.141592 / 180.0)
if((surfangle < (90 + angleThreshold) * 3.141592 / 180.0)
&& (surfangle > (90 - angleThreshold) * 3.141592 / 180.0))
{
dbg << " : quad\n";
// Since the surface is lower than the threshold, change the effective
// prism growth vector to match with the surface vector, so that
// the Quad which is created lies on the original surface
growthvectors.Elem(segpair_p1) = surfelem_vect;
//growthvectors.Elem(segpair_p1) = surfelem_vect;
// Add a quad element to account for the prism volume
// element which is going to be added
@ -410,6 +426,7 @@ namespace netgen
}
else
{
dbg << "\n";
for (int k = 1; k <= pnt1_elems.Size(); k++)
{
Element2d & pnt_sel = mesh.SurfaceElement(pnt1_elems.Elem(k));
@ -585,6 +602,8 @@ namespace netgen
cout << "Num of Quads: " << numquads << endl;
cout << "Num of Prisms: " << numprisms << endl;
cout << "Boundary Layer Generation....Done!" << endl;
dbg.close();
}
}