The global index numbering of the nodes is implicit in the order they are given in the file. The global index values for the nodes and elements stored within SU2 are zero-based, as opposed to starting from 1 as Tecplot does. This global element index is implied by the ordering and does not need to be explicitly specified by the file, although some legacy meshes may still contain an explicit index at the end of the line that can be ignored.įor a 2D mesh, only x and y coordinates are required, but a 3D mesh would give x, y, and z coordinates. The grid points are assigned a global element index of 0 through 8 in the order they appear in the file. Each line gives the coordinates for a single grid vertex. Immediately after the node number specification comes the list of node coordinates in cartesian space. In this case, there are 9 nodes in the 3x3 square above. For the 2D square mesh, the dimension is defined as follows: As a note, for 2D simulations, it is recommended that a truly 2D mesh is used (no z-coordinates) rather than a quasi-2D mesh (one or more cells deep in the third dimension with symmetry boundary conditions). su2 mesh declares the dimensionality of the problem. The node and element numbering for SU2 start at 0. Square Mesh Example: Note that the figure uses Tecplot node and element number (1-based). SpecificationĬonsider the following simple, 2D mesh for a square domain consisting of 8 triangular elements. Lastly, the boundaries of the mesh, or markers, are given names, or tags, and their connectivity is specified in a similar manner as the interior nodes. The connectivity description provides information about the types of elements (triangle, rectangle, tetrahedron, hexahedron, etc.) that make up the volumes in the mesh and also which nodes make up each of those elements. As an unstructured code, SU2 requires information about both the node locations as well as their connectivity. su2, and the files are in a readable ASCII format. The SU2 mesh format carries an extension of. A description of the mesh and some examples are below. The format is meant to be simple and readable. In keeping with the open-source nature of the project, SU2 features its own native mesh format. Details on how to create and use these mesh formats is given below. A converter from CGNS to the native format is also built into SU2. CGNS support can be useful when it is necessary to create complex geometries in a third-party mesh generation package that can export CGNS files. Support for the CGNS data format has also been included as an input mesh format. Commercial licenses allowing to embed Gmsh in closed-sourced software are also available: see the website for more information.SU2 mainly uses a native mesh file format as input into the various suite components. Gmsh is released under the GNU General Public License (GPL), version 2 or later. Major milestones include: Gmsh 2 in 2003 with OpenCASCADE integration, Gmsh 3 in 2017 with curvilinear meshing and boolean operations, and Gmsh 4 in 2018 with a stable C++, C, Python and Julia API. The Gmsh project was started in 1996, and open sourced in 2003. The specification of any input to these modules is done either interactively using the graphical user interface, in ASCII text files using Gmsh's own scripting language, or using the C++, C, Python or Julia Application Programming Interface (API). Gmsh is built around four modules: geometry, mesh, solver and post-processing. Its design goal is to provide a fast, light and user-friendly meshing tool with parametric input and advanced visualization capabilities. Gmsh is a 3D finite element mesh generator with built-in pre- and post-processing facilities.
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