Personal tools
You are here: Home → User Section → SALOME Tutorials → OCC Exercise 6
Log in


Forgot your password?
New user?
 

Example of usage mesh 3D algorithms and hypothesis

Example of usage mesh 3D algorithms and hypothesis

This sample is known to work on the latest SALOME release.
The compatibility with previous versions of SALOME is not guaranteed, though the sample can work on old versions also.

Objective

This exercise illustrates the use of SMESH SALOME 3D algorithms and hypothesis and functionalities for meshing of the prism shape.

Geometry

The sequence of actions is as follows:
  • Launch SALOME.
  • Create a new study.
  • Launch GEOM module.
  • Load script prism.py (menu File/Load script)
  • Create group of faces: (menu New Entity/Group/Create)
    Check 3rd radio button “Shape type faces”
    Select Main shape Prism_1
    Select 4 side Faces.
    Click "Add" then validate => Group_1

Construction and modification of the mesh

Launch SMESH module.
  • Creation of Mesh_1: (menu Mesh/Create Mesh)
    Geometry: Prism_1
    3D algorithm: Netgen 1D-2D-3D
    3D hypothesis: Netgen 3D parameters
    Max Size = 15
    Fineness Moderate
    Uncheck “Second order”, “Optimize” check-boxes
    Validate => Mesh_1

    • Compute Mesh_1
  • Controls/Volume Controls/Volumes
Netgen 1D-2D-3D algorithm does not require 2D and 1D algorithms and hypothesis. It creates tetrahedrons.		 OCC6_screen2
  • Display entity/ hide faces
  • Clipping/ New Plane
    //X-Y
    Distance 0.5
    Rotation around X (Y to Z) 0
    Rotation around Y (X to Z) 0
Clipping shows only part of mesh and permits to analyze mesh inside.		 OCC6_screen2
  • Edit Mesh_1: (menu Mesh/Edit Mesh)
    3D algorithm: Tetrahedron(Netgen)
    3D hypothesis: Max Element Volume = 100
    2D algorithm: Triangle Mefisto
    2D hypothesis: Max Element Area = 100
    1D algorithm: Wire Discretization
    1D hypothesis: Local length =20
    Validate => Mesh_1

  • Compute Mesh_1
Tetrahedron(Netgen) creates only tetrahedrons in this case.
OCC6_screen2
  • Creation of SubMesh_1: (menu Mesh/Create SubMesh)
    Geometry: Group_1 (side faces)
    2D algorithm: Quadrangle mapping
    Validate => SubMesh_1

  • Compute Mesh_1
Tetrahedron(Netgen) together with Quadrangle mapping creates pyramids (external layer) and tetrahedrons.

  • Edit Mesh_1: (menu Mesh/Edit Mesh)
    3D algorithm: 3D extrusion
    Validate => Mesh_1
  • Compute Mesh_1
3D extrusion creates only prisms in this case.















  • Edit Mesh_1: (menu Mesh/Edit Mesh)
    3D algorithm: Hexahedron(I,j,k)
    2D algorithm: Quadrangle mapping
    1D algorithm: Wire Discretization
    1D hypothesis: Local length = 20
    Validate => Mesh_1

  • Compute Mesh_1
Existing 2D and 1D algorithms and hypothesis are used (do not create new). Hexahedron(I,j,k) creates hexahedrons and prisms in this case.


Document Actions