An average 1000 tetrahedra/second is obtained on a 600Mhz computer for a mesh of one million tetrahedra. Gmsh is still slow, but the performance becomes acceptable. generate_mesh ( dim = 2, algorithm = 6 ) # Convert cell sets to material cell_data = field_data = # Export the mesh for post-processing mesh. Many stability enhancements in the 2D and 3D mesh algorithms. add_physical (, 'BOUND' ) # Remove duplicate entities geo. add_polygon ( bound_bot_pts, mesh_size = lc ) # Define materials geo. add_polygon ( bound_top_pts, mesh_size = lc ) bound_bot = geo. add_polygon ( bound_right_pts, mesh_size = lc ) bound_top = geo. add_polygon ( basaq_right_pts, mesh_size = 2.0 * lc ) bound_right = geo. add_polygon ( uppaq_right_pts, mesh_size = 2.0 * lc ) basaq_right = geo. add_polygon ( capro_bot_right_pts, mesh_size = 0.75 * lc ) uppaq_right = geo.

add_polygon ( capro_top_right_pts, mesh_size = 0.75 * lc ) capro_bot_right = geo. add_polygon ( cenaq_right_pts, mesh_size = 0.75 * lc ) capro_top_right = geo. add_polygon ( basaq_left_pts, mesh_size = 2.0 * lc ) cenaq_right = geo. add_polygon ( uppaq_left_pts, mesh_size = 2.0 * lc ) basaq_left = geo. add_polygon ( capro_bot_left_pts, mesh_size = 0.2 * lc ) uppaq_left = geo. add_polygon ( capro_top_left_pts, mesh_size = 0.2 * lc ) capro_bot_left = geo. add_polygon ( cenaq_left_pts, mesh_size = 0.1 * lc ) capro_top_left = geo. add_polygon ( fault_pts, mesh_size = 0.1 * lc ) cenaq_left = geo. Geometry () as geo : # Define polygons fault = geo. This is because Gmsh keeps the first node defined in the geometry in case it detects duplicated nodes. Note that layers are defined such that their characteristic lengths are increasing. To refine the mesh in the injection zone, the characteristic length of each layer entity is increased the farther we get from the injection point. Once all the points have been created, we can now generate the geometry, assign rock types/materials as Gmsh physical properties, and generate the mesh. Similarly to the fault entity, boundary entities are segmented to ensure conformity of the final mesh.īound_right_pts =, ,, ,, ,, , ] bound_top_pts =, ,, ,, ,, ,, ] bound_bot_pts =, ,, ,, ,, ,, ] Thus, physical boundary elements must be defined at the top, right and bottom sides of the model. In this sample problem, a no-flow boundary condition is imposed on the left side of the model (default in TOUGH), and Dirichlet boundary conditions are imposed elsewhere. Likewise, we also define the aquifer located at the right side of the fault.Ĭenaq_right_pts =, ,, , ] capro_top_right_pts =, ,, , ] capro_bot_right_pts =, ,, , ] uppaq_right_pts =, ,, , ] basaq_right_pts =, ,, , ]

Gmsh algorithm numbering