Week 11-3D Tetra Meshing Challenge

1. For the given MODEL 1, Create a Teramesh for Housing component with the following quality criteria.

TetraMesh Generation Method: 2D to 3D Conversion

Elements sizes: Min- 2 Units, Target- 5 Units, Max- 7 Units 

Tet collapse: 0.15

OBJECTIVE:

TO CREATE A TETRA MESH FOR HOUSING COMPONENT WITH GIVEN QUALITY CRITERIA.

Given Cad Model-1

TetraMesh Generation Method: 2D to 3D Conversion

For geometry clean-up on model following cm are used :-

• add construction line for better mesh flow
• Geom-Quick edit-split surf line
• Geom-Quick edit-split node
• Geom-Quick edit-toggle edge
• Geom-Quick edit-delete surf
• Geom-Quick edit-filler surf

Snap after geometry clean-up :-

• Next step is to create 2D tria element on surface of model
• Quality criteria :- Elements sizes: Min- 2 Units, Target- 5 Units, Max- 7 Units Tet collapse: 0.15

2D - automesh - surface

2D mesh Snap :-

• Convert 2D surface mesh to 3D volume mesh :-

3D - tetra mesh - element

Delete 2D element from model :

Delete - elements - by config - tria3

Final Meshing Model :-

Model-2:

Objective:

                To create a 3D Tetra mesh by using 'Quick Tetra mesh method for the given component with the mentioned quality criteria.

CAD Model Image:

Procedure:

• Firstly import the IGES model from the system files.
• After importing the model delete the solid parts of the component.
• Defeature the surface fillets which are having low fillet radius which may result in element failures.
• perform the geometry cleanup wherever it is required.
• For meshing the model using the 'Quick Tetra mesh method we have to go to the Utility panel.
• For Utility panel use view option view>Browsers>Hypermesh>utility.
• After that select Geom/Mesh from 'Utility Menu'.
• Then select Quick Tetra mesh as it opens a panel named as 'Quick Tetar panel'.
• In that panel select the component to be meshed and specify the mesh size,minimum element size and change the mesh type to 'Trias only'.
• Click on the 'Mesh' option to generate the tetra mesh.
• After generating the tetramesh we need to check for the Failed tet-collapse elements.

• For checking the failed elements select Tools>check elements>3D>tet collapse.
• For clearing the Tet-collapse elements we have to try to remesh the failed elements.
• If the failed tet-collapse elements still exists we have to follow other method as 'Translate' command in Tools option.
• To clear tet-collapse select Tools>translate option.
• Pick a node of the failed element which has minimum height.
• Select other nodes as N1,N2 & N3 for the translation.
• Assign the magnitude for Translating the node.
• After correction of the Failed elements check the tet-collapse value in 'Check elements' option.

Result:

For the given model tetra mesh is generated by using 'Quick Tetra mesh method' with the mentioned criteria,The final model image is as follows.

Final Model Image:

MODEL 3:-

Step 1:- Initially ww will import the given model for that go to import>>import geometry>>Step file then hit import.

Step 2:- cleaning The Geometries.

Step 3:- Creat Solids For All Parts.

Step 4:-  3D Meshing By Volume Tetra Mesh.

Step 5:- Element Quality Check .

FULL GEOMETRY.

Conclusion-

• Learnt about 3D tetra mesh using 2D tria mesh.
• Quick tetra mesh of solid part, Volume tetra mesh.
• How to do remesh of failed elements.

REMARKS 

i am using student version, due to that i cant able  to use mesh more then 1 lakhs nodes, that is why i save model 3 as a two files.