mesh2d_test

mesh2d_test, an Octave code which calls mesh2d(), which generates unstructured meshes in 2D.

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Copyright (c) 2009, Darren Engwirda
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Related Data and Programs:

mesh2d, an Octave code which generates unstructured meshes in 2D, by Darren Engwirda.

Source Code:

• mesh2d_test.m calls all the tests.
• mesh2d_test.sh runs all the tests.
• mesh2d_test.txt the output file.

AIRFOIL_EXTERIOR_test draws a mesh around the outside of an airfoil. The mesh uses 621 nodes and 1015 elements.

• airfoil_exterior_test.m the source code.
• airfoil.txt the coordinates of 102 points that trace out the shape of the airfoil, in clockwise direction.
• airfoil_exterior_elements.png an image of the elements.
• airfoil_exterior_nodes.png an image of the nodes.
• airfoil_exterior_vertices.png an image of the vertices.

AIRFOIL_INTERIOR_test draws a mesh inside an airfoil. The mesh uses 246 nodes and 369 elements.

• airfoil_interior_test.m the source code.
• airfoil.txt the coordinates of 102 points that trace out the shape of the airfoil, in clockwise direction.
• airfoil_interior_elements.png an image of the elements.
• airfoil_interior_vertices.png an image of the vertices.

BAFFLE_test considers a rectangular region containing 13 hexagonal baffles or obstacles. The mesh uses 512 nodes and 874 elements.

• baffle_test.m the source code.
• baffle_elements.png the elements created when we set a maximum element size of 0.5.
• baffle_nodes.png the nodes created when we set a maximum element size of 0.5.
• baffle_vertices.png the vertices that define the region and the obstacles.

CIRCLE_test considers a circular region with the interior and exterior boundaries each defined by 16 vertices.

• circle_test.m the source code.
• circle_elements.txt the elements.
• circle_elements.png an image of the elements.
• circle_nodes.txt the nodes.
• circle_nodes.png an image of the nodes.
• circle_vertices.png the vertices that define the region.
• circle.xml an XML file defining the mesh.

CIRCLES_test considers a circular region with an off-center hole, with the interior and exterior boundaries each defined by 16 vertices.

• circles_test.m the source code.
• circles_elements.png the elements created when we set a maximum element size of 0.25.
• circles_nodes.png the nodes created when we set a maximum element size of 0.25.
• circles_vertices.png the vertices that define the region and the obstacles.

ELL_test demonstrates features of MESH2D for the L-shaped region.

• ell_test.m the source code.
• ell_mesh1.png the mesh created with the simplest input.
• ell_mesh2.png the mesh created when we specify two small segments on the boundary.
• ell_mesh3.png the mesh created when we specify a maximum element size.
• ell_mesh4.png the mesh created when we specify a size function that requests small elements near the reentrant corner.
• ell_mesh5.png the mesh created we call refine() on the first mesh;
• ell_mesh6.png the mesh created when we call smoothmesh() on the second mesh.

• face_test.m demonstrates two example polygonal geometries for input to MESHFACES.
• mesh_collection.m contains a collection of meshing examples.
• mesh_test.m demonstrates the use of MESH2D.

ICAM_test demonstrates features of MESH2D for the first floor of the Wright House.

• icam_test.m the source code.
• icam_nodes.png the nodes created by MESH2D.
• icam_elements.png the elements created by MESH2D.

OBSTACLE_test demonstrates features of MESH2D for a channel with a square obstacle.

• obstacle_test.m the source code.
• obstacle_mesh.png a mesh created for the region.

RECTANGLE_MINUS_CIRCLE_test considers a region of a rectangle minus circular region with the interior and exterior boundaries each defined by 16 vertices.

• rectangle_minus_circle_test.m the source code.
• rectangle_minus_circle_elements.txt the elements.
• rectangle_minus_circle_elements.png an image of the elements.
• rectangle_minus_circle_nodes.txt the nodes.
• rectangle_minus_circle_nodes.png an image of the nodes.
• rectangle_minus_circle_vertices.png the vertices that define the region.
• rectangle_minus_circle.xml an XML file defining the mesh.

REFINE_test demonstrates how the refinement feature of MESH2D can be controlled with a mask, which specifies that only certain triangles should be refined, rather than all of them. The masked triangles are split into 4 subtriangles. Triangles immediately neighboring such triangles will be split in half. Remaining triangles will be untouched.

• refine_test.m the source code.
• refine_test1.png the initial mesh;
• refine_test2.png the mesh after refining all the triangles whose centroid has a Y coordinate greater than 1/2.
• refine_test3.png the mesh after a second refinement, on all the triangles whose centroid has an X coordinate less than 1/2.

square_border_test demonstrates how a constrained mesh can be created using MESHFACES. In this case, we have a square in a square. We want to mesh the two resulting regions in such a way that they share the nodes along the common edges.

• square_border_test.m the source code.
• square_border.png the mesh;

TWO_FOCI_test shows how a mesh density function can be created which enforces a small mesh near either of two foci, while smoothly enlarging as it moves away from them.

• two_foci_test.m the source code.
• two_foci_1.png the mesh generated by the vertices.
• two_foci_2.png the mesh, controlled by a maximum value of H.
• two_foci_3.png the mesh, controlled by a mesh density function that keeps the mesh small near either focus.