002- Abaq super meshing techniques .pptx

This presentation show the super meshing techniques for abaqus users

1. Mesh Generation Techniques (1/15) Free meshing Free meshing uses no pre-established mesh patterns, making it impossible to predict a free mesh pattern before creating the mesh. Element shape options available for free meshing two-dimensional regions: Quadrilateral Can be applied to any planar or curved surface. Quadrilateral-dominated Allows some triangular elements for transition. (default) Triangular Can be applied to any planar or curved surface.

2. quad mesh quad-dominated mesh triangular mesh Mesh Generation Techniques (2/15)

3. Mesh Generation Techniques (3/15) Element shape option available for free meshing three-dimensional regions. Tetrahedral—any geometry can be meshed with tetrahedral elements unless the mesh seeds are too coarse.

4. Mesh Generation Techniques (4/15) Swept meshing A mesh is created on one side of the region, known as the source side . The nodes of that mesh are copied, one element layer at a time, along the connecting sides of the region until the final side, known as the target side , is reached. The source and target sides are automatically located by Abaqus. source side target side nodes copied from the source side to each element layer and to the target side

5. Mesh Generation Techniques (5/15) Two-dimensional swept meshes All-quad meshing of swept regions Planar or curved surfaces Quad-dominated meshing of degenerate revolved regions (Degenerate regions include the axis of revolution) Swept mesh Degenerate revolved mesh

6. Mesh Generation Techniques (6/15) Three-dimensional swept meshes Swept solid regions can be filled with: Hex meshes Hex-dominated meshes Wedge meshes General sweep paths allowed Generalized sweep path through the thickness Generalized sweep path follows the draft angle Extruded mesh sweep path: straight line Revolved mesh sweep path: arc

7. Mesh Generation Techniques (7/15) Requirements for sweep meshable regions Topological The source side may contain multiple faces Target side must have only one face Connecting sides may contain multiple faces provided that the faces conform to a rectangular grid connecting sides source side

8. Mesh Generation Techniques (8/15) Requirements (cont'd) Geometric Adjacent faces will be combined to form the source side only if the edge dihedral angles are not too far from 180º Not sweep meshable Sweep meshable

9. Mesh Generation Techniques (9/15) Structured meshing The structured meshing technique generates meshes using simple predefined mesh topologies. Abaqus transforms the mesh of a regularly shaped region, such as a square or a cube, onto the geometry of the region you want to mesh. Structured meshing generally gives the most control over the mesh. Three-dimensional structured meshable regions Simple mesh topology s tructured tri mesh es

10. Mesh Generation Techniques (10/15) Mapped meshing Special case of structured meshing 4-sided surface regions Allows for improved mesh quality On by default for: Swept hex/hex-dominated mesh using advancing front algorithm Free quad/quad-dominated mesh using advancing front algorithm Free tetrahedral or triangular mesh Mapped meshing applied indirectly by meshing a region and allowing Abaqus/CAE to apply mapped meshing where appropriate

11. Mesh Generation Techniques (11/15) Mapped mesh example Free tet mesh Fill 4-sided patches with mapped tri meshes

12. Mesh Generation Techniques (12/15) Virtual topology In some cases part instances in the assembly contain small details such as faces and edges. Virtual topology allows you to ignore unimportant details. Detailed model Bad elements due to tiny faces and edges Virtual model Unimportant details abstracted away

13. Mesh Generation Techniques (13/15) Part instances that contain virtual topology can be meshed when using one of the following mesh techniques Free meshing Triangular and tetrahedral elements Quadrilateral or quadrilateral-dominated elements using the advancing front algorithm Swept meshing Hex or wedge elements Mapped meshing Quadrilateral, triangular, or hex elements

14. Mesh Generation Techniques (14/15) Example: virtual topology + swept meshing Adding partition and hole to virtual model Detailed bracket Virtual model (sweep meshable ) All-hex mesh

15. Mesh Generation Techniques (15/15) Automatic virtual topology Can automatically create virtual topology based on user supplied geometric parameters. Auto virtual topology