ForkMaster/netgen
1
0
Fork 0
mirror of https://github.com/NGSolve/netgen.git synced 2024-12-24 21:10:33 +05:00
Code Issues Packages Projects Releases Wiki Activity

* Changes to the Boundary Layer generation system

Browse Source 
* More user feedback when saving and exporting mesh files to disk
This commit is contained in:
Philippose Rajan 2009-10-27 23:04:42 +00:00
parent 6f39164242
commit b2e8610f90
4 changed files with 302 additions and 270 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
libsrc/meshing/boundarylayer.cpp
View File

@ -141,10 +141,15 @@ namespace netgen
Currently, the layer height is calculated using:
height = h_first_layer * (growth_factor^(num_layers - 1))
*/
void GenerateBoundaryLayer (Mesh & mesh)
void GenerateBoundaryLayer (Mesh & mesh, MeshingParameters & mp)
{
int i, j;
// 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;
cout << "Generate Prismatic Boundary Layers (Experimental)...." << endl;
// Use an array to support creation of boundary
@ -168,6 +173,12 @@ namespace netgen
}
cout << "Number of surfaces entered = " << surfid.Size() << endl;
cout << "Selected surfaces are:" << endl;
for(i = 1; i <= surfid.Size(); i++)
{
cout << "Surface " << i << ": " << surfid.Elem(i) << endl;
}
cout << endl << "Enter number of prism layers: ";
cin >> prismlayers;
@ -188,8 +199,18 @@ namespace netgen
{
cout << "Generating layer: " << layer << endl;
//double layerht = hfirst + growthfactor*(layer - 1)*hfirst;
double layerht = hfirst*pow(growthfactor,(double)(layer-1));
double layerht = hfirst;
if(growthfactor == 1)
{
layerht = layer * hfirst;
}
else
{
layerht = hfirst*(pow(growthfactor,(layer+1)) - 1)/(growthfactor - 1);
}
cout << "Layer Height = " << layerht << endl;
// Need to store the old number of points and
// surface elements because there are new points and
@ -201,6 +222,9 @@ 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
@ -213,9 +237,6 @@ namespace netgen
// the effective surface normal at a given point
Array<Vec3d> growthvectors(np);
// Update the mesh topology structures
mesh.UpdateTopology();
// Bit array to identify all the points belonging
// to the surface of interest
bndnodes.Clear();
@ -369,8 +390,13 @@ namespace netgen
mesh.LineSegment(j)[1] = mapto.Get(seg_p1);
mesh.LineSegment(j)[0] = mapto.Get(seg_p2);
if(surfangle <= 1.5707)
if(surfangle <= angleThreshold * 3.141592 / 180.0)
{
// 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;
// Add a quad element to account for the prism volume
// element which is going to be added
Element2d sel(QUAD);
@ -521,24 +547,27 @@ namespace netgen
{
double sfact = 0.9;
Element volel = mesh.VolumeElement(vertelems.Elem(j));
if((volel.GetType() == TET) || (volel.GetType() == TET10))
if(((volel.GetType() == TET) || (volel.GetType() == TET10)) && (!volel.IsDeleted()))
{
while((volel.Volume(mesh.Points()) <= 0.0) && (sfact >= 0.0))
{
mesh.Point(i).SetPoint(pointtomove + (sfact * layerht * growthvectors.Elem(i)));
mesh.ImproveMesh();
//while((volel.Volume(mesh.Points()) <= 0.0) && (sfact >= 0.0))
//{
// mesh.Point(i).SetPoint(pointtomove + (sfact * layerht * growthvectors.Elem(i)));
// mesh.ImproveMesh();
// Try to move the point back by one step but
// if the volume drops to below zero, double back
mesh.Point(i).SetPoint(pointtomove + ((sfact + 0.1) * layerht * growthvectors.Elem(i)));
if(volel.Volume(mesh.Points()) <= 0.0)
{
mesh.Point(i).SetPoint(pointtomove + (sfact * layerht * growthvectors.Elem(i)));
}
sfact -= 0.1;
}
// // Try to move the point back by one step but
// // if the volume drops to below zero, double back
// mesh.Point(i).SetPoint(pointtomove + ((sfact + 0.1) * layerht * growthvectors.Elem(i)));
// if(volel.Volume(mesh.Points()) <= 0.0)
// {
// mesh.Point(i).SetPoint(pointtomove + (sfact * layerht * growthvectors.Elem(i)));
// }
// sfact -= 0.1;
//}
volel.Delete();
}
}
mesh.Compress();
}
else
{

2
libsrc/meshing/boundarylayer.hpp
View File

@ -7,7 +7,7 @@ extern void InsertVirtualBoundaryLayer (Mesh & mesh);
/// Create a typical prismatic boundary layer on the given
/// surfaces
extern void GenerateBoundaryLayer (Mesh & mesh);
extern void GenerateBoundaryLayer (Mesh & mesh, MeshingParameters & mp);
#endif

7
ng/ngpkg.cpp
View File

@ -399,7 +399,7 @@ namespace netgen
}
const string filename (argv[1]);
PrintMessage (1, "Save mesh to file ", filename);
PrintMessage (1, "Save mesh to file ", filename, ".... Please Wait!");
ofstream outfile(filename.c_str());
mesh -> Save (outfile);
@ -408,6 +408,7 @@ namespace netgen
if (geometry && geometry->GetNSurf()) geometry->SaveSurfaces(outfile);
PrintMessage (1, "Save mesh to file .... DONE!");
return TCL_OK;
}
@ -465,6 +466,7 @@ namespace netgen
string filename (argv[1]);
string filetype (argv[2]);
PrintMessage (1, "Export mesh to file ", filename, ".... Please Wait!");
if (WriteUserFormat (filetype, *mesh, *geometry, filename))
{
@ -474,6 +476,7 @@ namespace netgen
return TCL_ERROR;
}
PrintMessage (1, "Export mesh to file .... DONE!");
return TCL_OK;
}
@ -1868,7 +1871,7 @@ namespace netgen
return TCL_ERROR;
}
GenerateBoundaryLayer (*mesh);
GenerateBoundaryLayer (*mesh, mparam);
return TCL_OK;
}