Week- 5 - Solid meshing

Aim:

• For the given rearview mirror model, apply structured (Ortho Tria & Tria) and unstructured (Tetra rapid or Tetra FEM) mesh accordingly

Objective:

• To perform Tetra - Mesh for the Rearview mirror with the quality parameters as given below

S.No	Quality Criteria	Value
1	Target/Average length	1
2	Minimum Length	0.5
3	Maximum Length	2
4	Tet collapse	0.2

Procedure:

For the hallow type model, the Mid-surface is not required and the meshing applied for the visible faces which are structured mesh (Ortho tria & Tria). After completed the structured mesh, start applying the mesh for the model volume an unstructured type (Tetra rapid or Tetra FEM) any one of this, which shows the model is structured outside and unstructured inside means which converts the mesh into tetra type in the volume

Importing Model

• Import the hood model from the existing location into the ANSA. The mirror model contains individual components as shown below

Geometry clean-up

• Initially, the given model has to check whether the model has any incomplete area or check for the model as completely defined. Before doing Geometry error, apply topo for all which reduces the error, and complete the geometry. While geometry error there are some issues in the model like needle face, cracked face, etc., which can be fixed automatically.

2D Meshing

• A structured mesh is defined as a mesh where the inner nodes have the same number of elements around them. Another possible interpretation of a structured mesh is that it follows a given topological pattern that is reproduced in all directions of space
• Here, Ortho Tria mesh is applied on the curved surfaces and Tria mesh is applied for the plane surfaces as per the quality criteria

3D Meshing

• Unstructured meshes are meshes with general connectivity (GCON) whose structure is arbitrary and therefore the connectivity of elements must be defined and stored. GCON element types are non-orthogonal, such as triangles (2D) and tetrahedra (3D)
• There are certain types in volume mesh-like Tetra rapid, Tetra FEM, Tetra CFD, etc., Here, Tetra rapid is applied throughout the volume and there is no teat collapse present in the model, and also there is no kinks & dips on the surface

Conclusion:

• The Geometry has been checked and cleared the error by Auto-fix
• The elements failing for tet collapse is optimized using the move option without affecting mesh on the surface
• The Ortho tria and Tria mesh has applied on the surface of the model as per the quality criteria and again checked for geometry error