Hello Daniel, thanks for your message.
I know how to find the cell index. Could I ask one more question? The question is about the grid. In code I used the function below to create the grid. template <int dim> Point<dim> grid_y_transform (const Point<dim> &pt_in) { const double &x = pt_in[0]; const double &y = pt_in[1]; Point<dim> pt_out = pt_in; return pt_out; } template <int dim,typename NumberType> void Solid<dim,NumberType>::make_grid() { // Divide the beam, but only along the x- and y-coordinate directions std::vector< unsigned int > repetitions(dim, parameters.elements_per_edge); // Only allow one element through the thickness // (modelling a plane strain condition) if (dim == 3){ repetitions[dim-1] = 8; //repetitions[0] = 0; //repetitions[1] = 2; //repetitions[2] = 2; } repetitions[1] = 8; repetitions[2] = 8; const Point<dim> top_right =Point<dim>(0.0, 0.0, -10); const Point<dim> bottom_left =Point<dim>(40,20, 10); GridGenerator::subdivided_hyper_rectangle(triangulation, repetitions, bottom_left, top_right); // Since we wish to apply a Neumann BC to the right-hand surface, we // must find the cell faces in this part of the domain and mark them with // a distinct boundary ID number. The faces we are looking for are on the // +x surface and will get boundary ID 11. // Dirichlet boundaries exist on the left-hand face of the beam (this fixed // boundary will get ID 1) and on the +Z and -Z faces (which correspond to // ID 2 and we will use to impose the plane strain condition) const double tol_boundary = 1e-6; typename Triangulation<dim>::active_cell_iterator cell = triangulation.begin_active(), endc = triangulation.end(); for (; cell != endc; ++cell) for (unsigned int face = 0; face < GeometryInfo<dim>::faces_per_cell; ++face) if (cell->face(face)->at_boundary() == true) { if (std::abs(cell->face(face)->center()[0] - 0.0) < tol_boundary) cell->face(face)->set_boundary_id(1); // -X faces else if (std::abs(cell->face(face)->center()[0] - 40.0) < tol_boundary) cell->face(face)->set_boundary_id(11); // +X faces else if (dim == 3 && std::abs(std::abs(cell->face(face)->center()[2]) - 10) < tol_boundary) cell->face(face)->set_boundary_id(2); // +Z and -Z faces } // Transform the hyper-rectangle into the beam shape GridTools::transform(&grid_y_transform<dim>, triangulation); GridTools::scale(parameters.scale, triangulation); vol_reference = GridTools::volume(triangulation); vol_current = vol_reference; std::cout << "Grid:\n\t Reference volume: " << vol_reference << std::endl; } My question is whether I can use NURBS to create the same grids and how I could create the grids with the NURBS. Thanks in advance! Best regards Lance Daniel Arndt <d.arndt.m...@gmail.com> 于 2023年12月4日周一 16:08写道: > Lance, > > Have a look at GridTools::vertex_to_cell_map( > https://www.dealii.org/current/doxygen/deal.II/namespaceGridTools.html#a9b7e2ca8ecd26a472e5225ba91a58acb > ). > > Best, > Daniel > > On Sun, Dec 3, 2023 at 11:38 PM Lance Zhang <dimo...@gmail.com> wrote: > >> Hello team, >> >> may I know how to find the cell index with the information of its global >> Dofs index? >> >> I have the global dofs index ,I would like to find which cell this global >> dof belongs to. >> >> Thanks in advance! >> Best regards >> Lance >> >> -- >> The deal.II project is located at http://www.dealii.org/ >> For mailing list/forum options, see >> https://groups.google.com/d/forum/dealii?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "deal.II User Group" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to dealii+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/dealii/4453e03d-2511-43c4-a05d-71e695a9276cn%40googlegroups.com >> <https://groups.google.com/d/msgid/dealii/4453e03d-2511-43c4-a05d-71e695a9276cn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- > The deal.II project is located at http://www.dealii.org/ > For mailing list/forum options, see > https://groups.google.com/d/forum/dealii?hl=en > --- > You received this message because you are subscribed to a topic in the > Google Groups "deal.II User Group" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/dealii/U7Il_6jPOCQ/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > dealii+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/dealii/CAOYDWbJLsBk2D45tHF4grTeHT%3DejkqQqXMtkLBqB1K-b%3DHbh%2BA%40mail.gmail.com > <https://groups.google.com/d/msgid/dealii/CAOYDWbJLsBk2D45tHF4grTeHT%3DejkqQqXMtkLBqB1K-b%3DHbh%2BA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. 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