Week 8-3D Tetra Meshing Challenge

Aim :-

Create Tetra mesh for given housing model with the following quality criteria.

Quality Criteria :-

Min Length :- 2 Units

Target :- 5 Units

Max Length :- 7 Units

Tet Collapse :- 0.15

1. Model 1 :- Mesh Generation Method = 2D to 3D conversion.

• Import .stp file.
• Geometry Clean-up.
• 2D mesh generation.
• 3D/Tetra mesh conversion.
• Quality clearance.

Procedure :-

1. Import the given .stp file using Import->Geometry->.stp->Import.

Fig 1 :- Import CAD Model

2. Delete solids in the midel using F2->solids->displayed->delete.

Fig 2 :- Delete Solids from the model

3. Clean-up the geometry by defeaturing and removing the unwanted lines using Geometry->Quick Edit->Toggle/Rerplace.

Fig 3 :- Geometry Clean-Up

4. Create 2D meshing on the clean CAD model using 2D->Automesh->Select Surface->Mesh Type=Trias->Mesh.

Fig 4 :- 2D Meshing on the component

5. In order to convert 2D mesh to 3D mesh use 3D->Tetramesh->Tetra mesh-> Select Elements->Mesh.

Fig 5.1 :- 3D meshing conversion

Fig 5.2 :- 3D mesh masking

6. Once the 3D meshing is completed, check for quality for Tet collapse = 0.15

Fig 6 :- Quality Criteria

2. Model 2 :- Mesh Generation Method = Quick Tetra Mesh.

• Import .stp file.
• Quick Tetra Mesh.
• Quality Clearance.

Procedure :-

1. Import the given .iges file to hypermesh.

Fig 1 :- Import CAD Model

2. Tetra meshing for the given compomnent is carried out by Quick Tetra Meshing method using View->Browsers->Utility->Geom/Mesh->Quick Tetra Mesh.

Fig 2.1 :- Quick Tetra Meshing Fig 2.2 :- Quick Tetra Mesh Result

Fig 2.3 :- Volume Mesh masking

3. Once the volume mesh is generated, check for tet collapse using Tool->Element Check->3D->Element Check->Tet Collapse. If the elements are failing for quality, remesh the elements using Tetra Remesh.

Fig 3 :- Quality Clearing

Model 3 :- Mesh Generation Method = Volume Tetra Mesh.

• Import .stp file.
• Geometry Clean-up.
• Volume Tetra meshing.
• Quality clearance.

Procedure :-

1. Import the .iges file to hypermesh.

Fig 1 :- Import the CAD Model

2. Perform Geometry clean-up and defeaturing using Geometry->Defeature->Surface Fillet->Select Surface->Find->Remove.

Fig 2.1 :- Geometry Clean-up

Fig 2.2 :- Defeaturing

3. Perform Tetra Meshing using 3D->tetra mesh->volume tetra->select solids->displayed->mesh.

Fig 3.1 :- Volume tetra meshing

Fig 3.2 :- Volume tetra mesh Creation

Fig 3.3 :- 3D Mesh Masking

4. Similarly perform meshing for all the sub components.

Fig 4 :- Volume Tetra Meshing for whole assembly

5. Once the volume mesh is generated, check for tet collapse using Tool->Element Check->3D->Element Check->Tet Collapse. If the elements are failing for quality, remesh the elements using Tetra Remesh.

Fig 5 :- Quality Clearing

Final Outcome :-

Model 1 :-

Model 2 :-

Model 3 :-

Result :-

The given 3 models are meshed with 3D tetra mesh using 3 different methods with the given quality criteria.