CREATING 3D TRTRAHEDRAL MESH

CREATING 3D TRTRAHEDRAL MESH

OBJECTIVE:

To mesh given components in various methods of Tetra mesh and produce 3D mesh.

Methods to create 3D Tetra mesh:

1. Conversion from 2D tria elements to 3D Tetra mesh.
2. Quick Tetra mesh.
3. Volume Tetra mesh.

PROCEDURE:

Conversion from 2D tria elements to 3D Tetra elements:

• Import geometry:

Given geometry imported using option File> Import >Model.

• Delete solid in the given model:

Delete > Solids > Displayed.

• Remove fillets less than 5mm radius:

Defeature > Surf fillets > Surf > Displayed.

This will find fillets and Remove from geometry.

• Edit surface:

Using Quick edit and Edge Edit options, some edges and points are modified. This process will continue while obtaining a proper surface which has no free edges.

• Creating 2D tria elements with the required parameter:

2D > automesh > Select surf > Element size (5mm) > Mesh style (tria) > Mesh.

This will create tria elements on the surface. After creating elements, check whether they satisfy quality criteria.

Tools > Check elements > Min length (2mm) and Max length(7mm).

Re-mesh element until it satisfies quality criteria.

• Convert 2D tria elements to 3D tetra elements:

3D > Tetramesh > Fixed Trias/Quads to Tetra mesh > Select tria elements.

After checking for Tet collapse, if elements failed to tet collapse value then proceed for Re-mesh.

• Remesh:

3D > Tetra remesh > 3D elements (Config > Tetra4) > 2D elements (Config > Tria3) > Remesh.

After remesh every element satisfies quality criteria, The model saved.

2.QUICK TETRAMESH:

• Import geometry:

File > Import > Model > Select file > Import.

• Delete solids in the given model as said before.
• Surface Cleanup is done manually and deleted Fillets, unwanted points, small parts (which less than minimum length), etc.,
• Open utility browser:

View > Browser > Hypermesh >Utilite.

Geom/Mesh > Quick Tetra mesh.

• Assign values:

Components: Comp > Select components.

Surface: Surface > Select surface.

Mesh size> Mesh 6mm

• After completing the mesh check for quality criteria. If elements not convinced, then re-mesh element by changing the Remesh parameter.
• Parameters to be set.

Mesh tetra size: Defines tetra mesh size.

Fill void: Fill by mesh inner area of volume.

Fix mid node: Save mid node position and prevent from motion while remesing.

Smoothing: Extra layer for aligning mesh finely.

3.VOLUME TETRAMESH:

• Import geometry.
• 3D > Tetra mesh > Select solid > Mesh size > Enable options [Use curvature, Use proximity and Cleanup elements]. >Mesh

• Check for element criteria, and Remesh if required.

Use curvature: Create mesh along with curvature without compromising geometry.

Use proximity: Refine the mesh and produce a smooth transition from small to large mesh.

Cleanup element: Additional refinement in elements.

FINAL IMAGES OF MESHED MODEL:

RESULT:

Thus Tetrahedral meshes created using the above-said method and satisfy quality criteria.