mirror of
https://git.salome-platform.org/gitpub/modules/smesh.git
synced 2024-11-12 00:29:17 +05:00
84 lines
3.9 KiB
ReStructuredText
84 lines
3.9 KiB
ReStructuredText
.. _basic_meshing_algos_page:
|
|
|
|
************************
|
|
Basic meshing algorithms
|
|
************************
|
|
|
|
The MESH module contains a set of meshing algorithms, which are used for meshing entities (1D, 2D, 3D sub-shapes) composing geometrical objects.
|
|
|
|
.. note:: Algorithms added to the module as plug-ins are described in documentation of the plug-ins.
|
|
|
|
An algorithm represents either an implementation of a certain meshing technique or an interface to the whole meshing program generating elements of several dimensions.
|
|
|
|
.. _a1d_algos_anchor:
|
|
|
|
* For meshing of 1D entities (**edges**):
|
|
|
|
* **Wire Discretization** meshing algorithm - splits an edge into a number of mesh segments following an 1D hypothesis.
|
|
* **Composite Side Discretization** algorithm - allows to apply a 1D hypothesis to a whole side of a geometrical face even if it is composed of several edges provided that they form C1 curve in all faces of the main shape.
|
|
|
|
* For meshing of 2D entities (**faces**):
|
|
|
|
* **Triangle: Mefisto** meshing algorithm - splits faces into triangular elements.
|
|
* :ref:`Quadrangle: Mapping <quad_ijk_algo_page>` meshing algorithm - splits faces into quadrangular elements.
|
|
|
|
.. image:: ../images/image123.gif
|
|
:align: center
|
|
|
|
.. centered::
|
|
Example of a triangular 2D mesh
|
|
|
|
.. image:: ../images/image124.gif
|
|
:align: center
|
|
|
|
.. centered::
|
|
Example of a quadrangular 2D mesh
|
|
|
|
* For meshing of 3D entities (**solid objects**):
|
|
|
|
* **Hexahedron (i,j,k)** meshing algorithm - solids are split into hexahedral elements thus forming a structured 3D mesh. The algorithm requires that 2D mesh generated on a solid could be considered as a mesh of a box, i.e. there should be eight nodes shared by three quadrangles and the rest nodes should be shared by four quadrangles.
|
|
.. image:: ../images/hexa_ijk_mesh.png
|
|
:align: center
|
|
|
|
.. centered::
|
|
Structured mesh generated by Hexahedron (i,j,k) on a solid bound by 16 faces
|
|
|
|
* :ref:`Body Fitting <cartesian_algo_page>` meshing algorithm - solids are split into hexahedral elements forming a Cartesian grid; polyhedra and other types of elements are generated where the geometrical boundary intersects Cartesian cells.
|
|
|
|
Some 3D meshing algorithms, such as Hexahedron(i,j,k) also can
|
|
generate 3D meshes from 2D meshes, working without geometrical objects.
|
|
|
|
* There is also a number of more specific algorithms:
|
|
|
|
* :ref:`Extrusion 3D <prism_3d_algo_page>` - for meshing prismatic 3D shapes with hexahedra and prisms.
|
|
* :ref:`Quadrangle: Medial Axis Projection <quad_from_ma_algo_page>` - for quadrangle meshing of faces with sinuous borders and rings.
|
|
* **Polygon per Face** meshing algorithm - generates one mesh face (either a triangle, a quadrangle or a polygon) per a geometrical face using all nodes from the face boundary.
|
|
* :ref:`Projection algorithms <projection_algos_page>` - for meshing by projection of another mesh.
|
|
* :ref:`Import algorithms <import_algos_page>` - for meshing by importing elements from another mesh.
|
|
* :ref:`Radial Prism <radial_prism_algo_page>` - for meshing 3D geometrical objects with cavities with hexahedra and prisms.
|
|
* :ref:`Radial Quadrangle 1D-2D <radial_quadrangle_1D2D_algo_page>` - for quadrangle meshing of disks and parts of disks.
|
|
* :ref:`Use Faces/Edges to be Created Manually <use_existing_page>` - to create a 1D or a 2D mesh in a python script.
|
|
* :ref:`Segments around Vertex <segments_around_vertex_algo_page>` - for defining the length of mesh segments around certain vertices.
|
|
|
|
|
|
:ref:`constructing_meshes_page` page describes in detail how to apply meshing algorithms.
|
|
|
|
**See Also** a sample TUI Script of a :ref:`tui_defining_meshing_algos` operation.
|
|
|
|
|
|
.. toctree::
|
|
:maxdepth: 2
|
|
:hidden:
|
|
|
|
quad_ijk_algo.rst
|
|
cartesian_algo.rst
|
|
prism_3d_algo.rst
|
|
quad_from_ma_algo.rst
|
|
projection_algos.rst
|
|
use_existing_algos.rst
|
|
radial_prism_algo.rst
|
|
radial_quadrangle_1D2D_algo.rst
|
|
define_mesh_by_script.rst
|
|
segments_around_vertex_algo.rst
|
|
|