Week- 5 - Solid meshing

AIM:

for given rear view mirror component , check the geometry and mesh the surface with 2D elements with Shell Criteria mentioned below.

Use tetra element to mesh the defined volume of the same surface mesh for given Solid Criteria

GIVEN DATA:

1.Quality Criteria

Shell Criteria .

Sr no	Quality Criteria	value
1	target/avg length	1
2	minimum length	0.5
3	maximum length	2

Solid Criteria .

Sr no	Quality Criteria	value
1	tet collapse	0.2

2.Cad Model

INFORMATION :

Any model which measures more than 5 mm , we generally go with volume mesh. For this model we choose to go with volume mesh . Solid /volume mesh is 3 DIMENSIONAL mesh .

In solid mesh we have two types of mesh

1. Tetra mesh (unstructured mesh ) -----------(it is easier than hexa modeling )
2. Hexa mesh (structured / maped mesh )

For this model we choose tetra mesh , Tetra madeling is making surface mesh using tria elements and then generating volume mesh out of it .

Tetra element will not be very coarse as in pshell

PROCEDURE :

Performing geometry cleanup & geometry check .

Give quality criteria and assign mesh length in MESH deck (in it main quality parameter is : min length , max length )

Generate surface mesh with TRIA element

For all the components of the model we mesh them with combination of ortho tria and tria elements

And solving all the OFF elements for the meshed surface .

Define a volume in V.MESH deck

After surface meshing has been done we have to define volume mesh out of the surface we meshed earlier

After defining mesh volume we can mesh this volume with either TETRA RAPID or TETRA FEM algorithm, and then solving all the OFF elements for volume meshed components with given quality criteria.

For the off element will be elements which are failing for tet collapse .we can solve this by the use of auto fix or we can use manual method employing MV Free to adjust nodes of element to clear the quality.

Learning outcomes:

• At the end of this challenge, i can able to
• Perform geometry clean-up for any solid model
• Generate surface mesh on it
• Generate the surface mesh meeting the given quality criteria for any solid model
• Define volume for any surface meshed model
• And mesh this volume by using solid mesh
• Identify the quality failure and resolve the failure & improve the mesh quality
• Working with ANSA

Conclusion:

The given rear view mirror setup Is pre processed successfully ,with all the part assembled and FE mesh that satisfy all the quality criteria assigned with the property of the component.