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114 lines
4.9 KiB
Plaintext
114 lines
4.9 KiB
Plaintext
/*!
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\page ghs3d_hypo_page GHS3D Parameters hypothesis
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\n GHS3D Parameters hypothesis works only with <b>Tetrahedron (GHS3D)</b>
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algorithm. This algorithm is a commercial software.
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<h1>General parameters</h1>
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\image html ghs3d_parameters_basic.png
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<ul>
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<li><b>Name</b> - allows to define the name of the hypothesis (GHS3D
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Parameters by default).</li>
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<li><b>To mesh holes</b> - if checked, the algorithm will
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create mesh in the holes inside a solid shape, else only the outermost
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shape will be meshed. Volumic elements created within holes are bound
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to the solid.</li>
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<li><b>Optimization level</b> - allows choosing the required
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optimization level: none, light, medium or strong. Higher level of
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optimisation provides better mesh, but can be time-consuming.
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</li>
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<h1>Advanced parameters</h1>
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\image html ghs3d_parameters_advanced.png
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<li><b>Maximum memory size</b> - launches ghs3d software with
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work space limited to the specified amount of RAM, in Mbytes. If this option is
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checked off, the software will be launched with 7O% of the total RAM space. </li>
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<li><b>Initial memory size</b> - starts ghs3d software with
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the specified amount of work space, in Mbytes. If this option is checked off, the
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software will be started with 100 Megabytes of working space. </li>
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<li><b>Working directory</b> - allows defining the folder for input and output
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files of ghs3d software, which are the files starting with "GHS3D_" prefix. </li>
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<li><b>Keep working files</b> - allows checking input and output files
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of ghs3d software, while usually these files are removed after the
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launch of the mesher.</li>
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<li><b>Verbose level</b> - to choose verbosity level in the range from
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0 to 10.
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<ul> <li>0, no standard output,
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</li><li>2, prints the data, quality statistics of the skin and final
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meshes and indicates when the final mesh is being saved. In addition
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the software gives indication regarding the CPU time.
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</li><li>10, same as 2 plus the main steps in the computation, quality
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statistics histogram of the skin mesh, quality statistics histogram
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together with the characteristics of the final mesh.
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</li></ul></li>
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<li><b>To create new nodes</b> - if this option is checked off, ghs3d
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tries to create tetrahedrons using only the nodes of the 2D mesh.</li>
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<li><b>To remove initial central point</b> - TetMesh-GHS3D adds an internal point
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at the centre of gravity of the bounding box in order to speed up and to simplify
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the meshing process. It is however possible for TetMesh-GHS3D to refrain from creating
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this point by using the command line option -no initial central point. This can be
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particularly useful to generate a volume mesh without internal points at all, and in some rare cases,
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to help the boundary regeneration phase when it failed with the standard options (for example when
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one dimension of the domain is large compared to the other two, with a ratio of 20 or more).
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Use this option when the boundary regeneration failed with the standard parameters and before using
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the recovery version (command line option -C).
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Note: when using this option, the speed of the meshing process may decrease, and quality may change.
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Note: the boundary regeneration may fail with this option, in some rare cases.</li>
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<li><b>To use boundary recovery version</b> - enables using a
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boundary recovery module which tries to
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create volume meshes starting from very poor quality surface meshes
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(almost flat triangles on the surface, high density propagation,
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extreme aspect ratios, etc.) which fails with the standard version. The
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resulting volume mesh will however most likely have a very poor
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quality (poor aspect ratio of elements, tetrahedra with a very small
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positive volume).</li>
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<li><b>To use FEM correction</b> - Applies finite-element correction by
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replacing overconstrained elements where it is possible. The process is
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first slicing the overconstrained edges and second the overconstrained
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facets. This ensures that no edges have two boundary vertices and that
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no facets have three boundary vertices. TetMesh-GHS3D gives the initial
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and final overconstrained edges and facets. It also gives the facets
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which have three edges on the boundary.
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Note: when using this option, the speed of the meshing process may
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decrease, quality may change, and the smallest volume may be smaller.
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The default is no correction.</li>
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<li><b>Option as text</b> - allows input of any text as command line
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for ghs3d. This allows the input of advanced options in a free from. </li>
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</ul>
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<h1>Enforced vertices</h1>
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\image html ghs3d_enforced_vertices.png
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GHS3D algorithm can locally raffine the mesh. It is possible to define enforced vertices in the volume where the mesh will be raffined.
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A node will be created at the enforced vertex coordinates. There is no need to create a vertex in the CAD.
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An enforced vertex is defined by:
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<ul>
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<li>The (x,y,z) cartesian coordinates</li>
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<li>A constant physical size</li>
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</ul>
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<br><b>See Also</b> a sample TUI Script of the \ref tui_ghs3d "creation of a Ghs3D hypothesis", including enforced vertices.
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*/ |