Galerkin FEM for elliptic PDEs
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FEM4EllipticPDE_bhmag.cpp 5.3KB

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  1. // ===========================================================================
  2. //
  3. // Filename: utFEM4EllipticPDE.cpp
  4. //
  5. // Created: 08/16/12 19:49:10
  6. // Compiler: Tested with g++, icpc, and MSVC 2010
  7. //
  8. // Author: Trevor Irons (ti)
  9. //
  10. // Organisation: Colorado School of Mines (CSM)
  11. // United States Geological Survey (USGS)
  12. //
  13. // Email: tirons@mines.edu, tirons@usgs.gov
  14. //
  15. // This program is free software: you can redistribute it and/or modify
  16. // it under the terms of the GNU General Public License as published by
  17. // the Free Software Foundation, either version 3 of the License, or
  18. // (at your option) any later version.
  19. //
  20. // This program is distributed in the hope that it will be useful,
  21. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  22. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23. // GNU General Public License for more details.
  24. //
  25. // You should have received a copy of the GNU General Public License
  26. // along with this program. If not, see <http://www.gnu.org/licenses/>.
  27. //
  28. // ===========================================================================
  29. /**
  30. @file
  31. @author Trevor Irons
  32. @date 08/16/12
  33. @version 0.0
  34. **/
  35. #include "FEM4EllipticPDE.h"
  36. #include "vtkSphere.h"
  37. #include "vtkRectilinearGrid.h"
  38. #include "vtkFloatArray.h"
  39. #include <vtkIdList.h>
  40. #include <vtkIdTypeArray.h>
  41. #include <vtkCell.h>
  42. #include <vtkTriangleFilter.h>
  43. #include <vtkDataSetSurfaceFilter.h>
  44. #include <vtkExtractCells.h>
  45. #include <vtkGeometryFilter.h>
  46. #include <vtkUnstructuredGrid.h>
  47. #include <vtkExtractEdges.h>
  48. #include <vtkImplicitDataSet.h>
  49. #include <vtkXMLUnstructuredGridReader.h>
  50. // debugging stuff
  51. #include <vtkDataSetMapper.h>
  52. #include <vtkSelectionNode.h>
  53. #include <vtkExtractSelection.h>
  54. #include <vtkSelection.h>
  55. #include <vtkVertexGlyphFilter.h>
  56. #define RENDERTEST
  57. //#define CONNECTTEST
  58. #ifdef RENDERTEST
  59. #include "vtkRectilinearGridGeometryFilter.h"
  60. #include "vtkRectilinearGridOutlineFilter.h"
  61. #include "vtkPolyDataMapper.h"
  62. #include "vtkActor.h"
  63. #include "vtkRenderWindowInteractor.h"
  64. #include "vtkRenderer.h"
  65. #include "vtkRenderWindow.h"
  66. #include "vtkCamera.h"
  67. #include "vtkProperty.h"
  68. #include <vtkDataSetMapper.h>
  69. #include <vtkSelectionNode.h>
  70. #include <vtkSelection.h>
  71. #include <vtkExtractSelection.h>
  72. #include <vtkExtractEdges.h>
  73. #include <vtkVertexGlyphFilter.h>
  74. #include <vtkTriangleFilter.h>
  75. #include <vtkImplicitHalo.h>
  76. #endif
  77. using namespace Lemma;
  78. Real Magnet(const Real& x, const Real& y, const Real& z);
  79. int main(int argc, char**argv) {
  80. Eigen::initParallel();
  81. if (argc < 4) {
  82. std::cout << "usage: ./utFEMEllipticPDE_bhmag <g.vtu> <mesh.vtu> <results.vtu>" << std::endl;
  83. //std::cout << "usage: ./utFEMEllipticPDE_bhmag <mesh.vtu> <results.vtu>" << std::endl;
  84. exit(EXIT_SUCCESS);
  85. }
  86. int nx = 80;
  87. //double dx = .0021875 ; // 160
  88. double dx = .004375 ; // 160
  89. double ox = -.175;
  90. vtkFloatArray *xCoords = vtkFloatArray::New();
  91. for (int i=0; i<nx+1; i++) xCoords->InsertNextValue(ox + i*dx);
  92. int ny = 80;
  93. double dy = .004375;
  94. double oy = -.175;
  95. vtkFloatArray *yCoords = vtkFloatArray::New();
  96. for (int i=0; i<ny+1; i++) yCoords->InsertNextValue(oy + i*dy);
  97. int nz = 343; // 685; // 160
  98. double dz = .004375;
  99. double oz = 9.75;
  100. vtkFloatArray *zCoords = vtkFloatArray::New();
  101. for (int i=0; i<nz+1; i++) zCoords->InsertNextValue(oz + i*dz);
  102. vtkRectilinearGrid *rGrid = vtkRectilinearGrid::New();
  103. rGrid->SetDimensions(nx+1, ny+1, nz+1);
  104. rGrid->SetExtent(0, nx, 0, ny, 0, nz);
  105. rGrid->SetXCoordinates(xCoords);
  106. rGrid->SetYCoordinates(yCoords);
  107. rGrid->SetZCoordinates(zCoords);
  108. ////////////////////////////////////////////
  109. // Define Sigma/mu term
  110. // TODO
  111. ////////////////////////////////////////////
  112. // Define source (G) term
  113. vtkXMLUnstructuredGridReader* GReader = vtkXMLUnstructuredGridReader::New();
  114. std::cout << "Reading G file " << argv[1] << std::endl;
  115. GReader->SetFileName(argv[1]);
  116. GReader->Update();
  117. vtkImplicitDataSet* implG = vtkImplicitDataSet::New();
  118. implG->SetDataSet(GReader->GetOutput());
  119. implG->SetOutValue(0.);
  120. implG->SetOutGradient(0., 0., 0.);
  121. ////////////////////////////////////////////
  122. // Define solution mesh
  123. vtkXMLUnstructuredGridReader* MeshReader = vtkXMLUnstructuredGridReader::New();
  124. std::cout << "Reading Mesh file " << argv[2] << std::endl;
  125. MeshReader->SetFileName(argv[2]);
  126. MeshReader->Update();
  127. ////////////////////////////////////////////
  128. // Solve
  129. FEM4EllipticPDE *Solver = FEM4EllipticPDE::New();
  130. Solver->SetGFunction(implG);
  131. //Solver->SetGFunction(Magnet);
  132. //Solver->SetSigmaFunction(implSigma);
  133. Solver->SetBoundaryStep(.05);
  134. Solver->SetGrid(MeshReader->GetOutput());
  135. //Solver->SetupPotential();
  136. //Solver->SetGrid(rGrid);
  137. Solver->Solve(argv[3]);
  138. // Clean up
  139. Solver->Delete();
  140. GReader->Delete();
  141. implG->Delete();
  142. exit(EXIT_SUCCESS);
  143. }
  144. Real Magnet(const Real& x, const Real& y, const Real& z) {
  145. if (z < 10 || z > 11 ) {
  146. return 0.;
  147. } else if ( std::sqrt(x*x + y*y) <= 0.05 ) {
  148. if (x>0.) return 1.;
  149. if (x<0.) return -1.;
  150. }
  151. return 0.;
  152. }