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Merge pull request #653 from DLR-AMR/addition-cmesh-example-squared-disk
Cmesh example with curvilinear geometry: Squared Disk [1/n]
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| This file is part of t8code. | ||
| t8code is a C library to manage a collection (a forest) of multiple | ||
| connected adaptive space-trees of general element types in parallel. | ||
| Copyright (C) 2023 the developers | ||
| t8code is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; either version 2 of the License, or | ||
| (at your option) any later version. | ||
| t8code is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with t8code; if not, write to the Free Software Foundation, Inc., | ||
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | ||
| */ | ||
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| /* Show-case several cmesh examples with curvilinear geometries. */ | ||
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| #include <t8.h> /* General t8code header, always include this. */ | ||
| #include <t8_cmesh.h> /* cmesh definition and basic interface. */ | ||
| #include <t8_forest/t8_forest_general.h> /* forest definition and basic interface. */ | ||
| #include <t8_schemes/t8_default/t8_default_cxx.hxx> /* default refinement scheme. */ | ||
| #include <t8_cmesh_vtk_writer.h> /* write file in vtu file */ | ||
| #include <t8_forest/t8_forest_io.h> | ||
| #include <t8_cmesh/t8_cmesh_examples.h> | ||
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| int | ||
| main (int argc, char **argv) | ||
| { | ||
| /* | ||
| * Initialization. | ||
| */ | ||
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| /* Initialize MPI. This has to happen before we initialize sc or t8code. */ | ||
| int mpiret = sc_MPI_Init (&argc, &argv); | ||
| /* Error check the MPI return value. */ | ||
| SC_CHECK_MPI (mpiret); | ||
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| /* Initialize the sc library, has to happen before we initialize t8code. */ | ||
| sc_init (sc_MPI_COMM_WORLD, 1, 1, NULL, SC_LP_PRODUCTION); | ||
| /* Initialize t8code with log level SC_LP_PRODUCTION. See sc.h for more info on the log levels. */ | ||
| t8_init (SC_LP_PRODUCTION); | ||
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| /* We will use MPI_COMM_WORLD as a communicator. */ | ||
| sc_MPI_Comm comm = sc_MPI_COMM_WORLD; | ||
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| /* | ||
| * Creation of several meshes and storing them to disk. | ||
| */ | ||
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| { | ||
| const char *prefix_cmesh = "t8_squared_disk_cmesh"; | ||
| const char *prefix_forest = "t8_squared_disk_forest"; | ||
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| const int uniform_level = 5; | ||
| const double radius = 1.0; | ||
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| t8_cmesh_t cmesh = t8_cmesh_new_squared_disk (radius, comm); | ||
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| t8_forest_t forest = t8_forest_new_uniform (cmesh, t8_scheme_new_default_cxx (), uniform_level, 0, comm); | ||
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| t8_cmesh_vtk_write_file (cmesh, prefix_cmesh, 1.0); | ||
| t8_global_productionf ("Wrote %s.\n", prefix_cmesh); | ||
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| t8_forest_write_vtk_ext (forest, prefix_forest, 1, 1, 1, 1, 0, 1, 0, 0, NULL); | ||
| t8_global_productionf ("Wrote %s.\n\n", prefix_forest); | ||
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| t8_forest_unref (&forest); | ||
| } | ||
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| /* More examples will be added soon. */ | ||
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| /* Finalize the sc library */ | ||
| sc_finalize (); | ||
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| mpiret = sc_MPI_Finalize (); | ||
| SC_CHECK_MPI (mpiret); | ||
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| return 0; | ||
| } |
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122 changes: 122 additions & 0 deletions
122
src/t8_geometry/t8_geometry_implementations/t8_geometry_examples.cxx
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| /* | ||
| This file is part of t8code. | ||
| t8code is a C library to manage a collection (a forest) of multiple | ||
| connected adaptive space-trees of general element classes in parallel. | ||
| Copyright (C) 2023 the developers | ||
| t8code is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; either version 2 of the License, or | ||
| (at your option) any later version. | ||
| t8code is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with t8code; if not, write to the Free Software Foundation, Inc., | ||
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | ||
| */ | ||
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| #include <t8_geometry/t8_geometry_implementations/t8_geometry_examples.hxx> | ||
| #include <t8_geometry/t8_geometry_helpers.h> | ||
| #include <t8_vec.h> | ||
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| void | ||
| t8_geometry_squared_disk::t8_geom_evaluate (t8_cmesh_t cmesh, t8_gloidx_t gtreeid, const double *ref_coords, | ||
| double out_coords[3]) const | ||
| { | ||
| double n[3]; /* Normal vector. */ | ||
| double r[3]; /* Radial vector. */ | ||
| double s[3]; /* Radial vector for the corrected coordinates. */ | ||
| double p[3]; /* Vector on the plane resp. quad. */ | ||
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| const double x = ref_coords[0]; | ||
| const double y = ref_coords[1]; | ||
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| t8_locidx_t ltreeid = t8_cmesh_get_local_id (cmesh, gtreeid); | ||
| double *tree_vertices = t8_cmesh_get_tree_vertices (cmesh, ltreeid); | ||
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| t8_geom_linear_interpolation (ref_coords, tree_vertices, 3, 2, p); | ||
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| /* Center square. */ | ||
| if (gtreeid == 0) { | ||
| out_coords[0] = p[0]; | ||
| out_coords[1] = p[1]; | ||
| out_coords[2] = 0.0; | ||
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| return; | ||
| } | ||
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| /* Four squares framing the central one. */ | ||
| { | ||
| const double center_ref[3] = { 0.5, 0.5, 0.0 }; | ||
| t8_geom_linear_interpolation (center_ref, tree_vertices, 3, 2, n); | ||
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| /* Normalize vector `n`. */ | ||
| const double norm = sqrt (n[0] * n[0] + n[1] * n[1]); | ||
| n[0] = n[0] / norm; | ||
| n[1] = n[1] / norm; | ||
| } | ||
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| { | ||
| /* Radial vector parallel to one of the tilted edges of the quad. */ | ||
| r[0] = tree_vertices[0]; | ||
| r[1] = tree_vertices[1]; | ||
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| /* Normalize vector `r`. */ | ||
| const double norm = sqrt (r[0] * r[0] + r[1] * r[1]); | ||
| r[0] = r[0] / norm; | ||
| r[1] = r[1] / norm; | ||
| } | ||
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| { | ||
| double corr_ref_coords[3]; | ||
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| /* Correction in order to rectify elements near the corners. */ | ||
| corr_ref_coords[0] = tan (0.5 * M_PI * (x - 0.5)) * 0.5 + 0.5; | ||
| corr_ref_coords[1] = y; | ||
| corr_ref_coords[2] = 0.0; | ||
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| /* Compute and normalize vector `s`. */ | ||
| t8_geom_linear_interpolation (corr_ref_coords, tree_vertices, 3, 2, s); | ||
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| const double norm = sqrt (s[0] * s[0] + s[1] * s[1]); | ||
| s[0] = s[0] / norm; | ||
| s[1] = s[1] / norm; | ||
| } | ||
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| { | ||
| const double out_radius = (p[0] * n[0] + p[1] * n[1]) / (r[0] * n[0] + r[1] * n[1]); | ||
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| const double blend = y * out_radius; /* y \in [0,1] */ | ||
| const double dnelb = 1.0 - y; | ||
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| out_coords[0] = dnelb * p[0] + blend * s[0]; | ||
| out_coords[1] = dnelb * p[1] + blend * s[1]; | ||
| out_coords[2] = 0.0; | ||
| } | ||
| } | ||
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| T8_EXTERN_C_BEGIN (); | ||
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| void | ||
| t8_geometry_destroy (t8_geometry_c **geom) | ||
| { | ||
| T8_ASSERT (geom != NULL); | ||
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| delete *geom; | ||
| *geom = NULL; | ||
| } | ||
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| /* Satisfy the C interface from t8_geometry_linear.h. */ | ||
| t8_geometry_c * | ||
| t8_geometry_squared_disk_new () | ||
| { | ||
| t8_geometry_squared_disk *geom = new t8_geometry_squared_disk (); | ||
| return (t8_geometry_c *) geom; | ||
| } | ||
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| T8_EXTERN_C_END (); |
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