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The Open FUSION Toolkit 1.0.0-8905cc5
Modeling tools for plasma and fusion research and engineering
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The Open FUSION Toolkit (OFT) includes an interface to the CUBIT mesh generation program. This interface allows the import and refinement of meshes created in CUBIT. Mesh import requires that OFT is built with NETCDF. Boundary conformal refinement requires the OpenNURBS library as well.
In order to construct the boundary representaion in OFT required for refinement associated CAD information must be output along with the mesh. This is accomplished via the refine parallel command in CUBIT. Once the mesh has been created in CUBIT use the command line to export the mesh and CAD data with the refine parallel command, where "base_name" is the root name for the output files.
refine parallel fileroot "base_name" overwrite no_execute
This command will generate two files: a mesh file base_name.in.e and a CAD file base_name.3dm which are used by OFT.
refine parallel functions correctly with CUBIT 14+ only.In order to use a CUBIT mesh cad_type = 2 must be specified in the mesh_options group. The mesh files and some additional options are specified at runtime in the cubit_options group. The options available in this group are listed below.
Option group: cubit_options
| Option | Description | Type [dim] |
|---|---|---|
filename="" | Name of mesh file | str(OFT_PATH_SLEN) |
inpname="" | Name of OpenNURBS geometry file | str(OFT_PATH_SLEN) |
lf_file=T | Large file format flag | bool |
reflect=F | Reflect mesh about xy-plane | bool |
per_ns=-1 | Nodeset ID for periodic surfaces | int |
zstretch=1. | Scale for z-direction | float |
For CUBIT meshes new points are placed by minimizing the weighted sum of the distances between the new point and its parent points, subject to the constraint that the point exist on the boundary surface. For example if a new point is to be placed at the midpoint of a boundary edge, the process is as follows. The parent CAD entity for that edge is first determined, either curve or surface. A point is the found by minimizing the sum of the distance from each end point to the new point by adjusting its position in parametric space on this CAD entity. Minimization is performed using a Levenburg-Marquardt algorith provided by the MINPACK library.
1.9.8