Week 8-Challenge
3d Tetra meshing of the given models in Hypermesh
Objective
Tetramesh the given geometry (Maintain Tet Collapse < 0.15)
Drive Link - https://drive.google.com/file/d/1JYekWAw8lEdEhZaUbD-Mf_zoMswhcMUJ/view?usp=sharing
Overview
Tetra Meshing Methods
- Standard Tetramesh – Tria shell meshing is carried out on the outer geometry. Then later converted to tetras.
- Volumetric mesh – The surface or solid geometry which is enclosed used to carry out this this automatic meshing. Used has no control of mesh. (Use proximity and curvature for better mesh quality over curvature and hole area)
- Quick Tetramesh - This is quick method, where the meshing can be done by maintaining the quality criteria
Procedure
- Open Model – Check its integrity – Solid or surface
- Organize the different components to different collectors.
- Geometry cleanup – remove unwanted fillets and toggle lines which may cause the elements to fail.
- Perform Automeshing (trias) with the given element sizes in this case 5 and 6.
- In the 3d panel use fixed option and select the 2d shell elements to perform the tetramesh.
- Other option is to use volumetric meshing and select the surfaces/ solids, check the use proximity and curvature options to have more control over the mesh size, feature angle of the tetras.
- Quality check , mainly tet collapse is used to validate the quality of the mesh generated –
Tet collapse acceptable value in this challenge should be less than 0.15. It is defined as the distance h, from the opposite face divided by the area of the face multiplied by 1.24.
- In case an element fails adjusting the height using translate or dimensioning option to adjust the height.
- Check for duplicates and arrange the 2d and 3d elements separately.
- Reflect the elements in the case of the chassis.
Result
Tetrameshing was performed using different methods and quality criteria was maintained.
Takeaways from this challenge – geometry cleanup and trying different methods is very important aspect of 3d tetrameshing.