* Changes to the Boundary Layer generation system

* More user feedback when saving and exporting mesh files to disk

libsrc/meshing/boundarylayer.cpp

@@ -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;
-         double layerht = hfirst*pow(growthfactor,(double)(layer-1));
+
+         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))
+                        //while((volel.Volume(mesh.Points()) <= 0.0) && (sfact >= 0.0))
-                        {
+                        //{
-                           mesh.Point(i).SetPoint(pointtomove + (sfact * layerht * growthvectors.Elem(i)));
+                        //   mesh.Point(i).SetPoint(pointtomove + (sfact * layerht * growthvectors.Elem(i)));
-                           mesh.ImproveMesh();
+                        //   mesh.ImproveMesh();
 
-                           // Try to move the point back by one step but 
+                        //   // Try to move the point back by one step but 
-                           // if the volume drops to below zero, double back
+                        //   // if the volume drops to below zero, double back
-                           mesh.Point(i).SetPoint(pointtomove + ((sfact + 0.1) * layerht * growthvectors.Elem(i)));
+                        //   mesh.Point(i).SetPoint(pointtomove + ((sfact + 0.1) * layerht * growthvectors.Elem(i)));
-                           if(volel.Volume(mesh.Points()) <= 0.0)
+                        //   if(volel.Volume(mesh.Points()) <= 0.0)
-                           {
+                        //   {
-                              mesh.Point(i).SetPoint(pointtomove + (sfact * layerht * growthvectors.Elem(i)));
+                        //      mesh.Point(i).SetPoint(pointtomove + (sfact * layerht * growthvectors.Elem(i)));
-                           }
+                        //   }
-                           sfact -= 0.1;
+                        //   sfact -= 0.1;
-                        }
+                        //}
+                        volel.Delete();
                      }
                   }
+
+                  mesh.Compress();
                }
                else
                {

libsrc/meshing/boundarylayer.hpp

@@ -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

ng/ngpkg.cpp

@@ -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;
   }