Week 5

TETRA MESHING OF REARVIEW MIRROR MODEL USING ANSA

AIM:

To remove geometric errors and perform volume mesh using tetra elements with the given quality criteria.

Methodology:

Geometry cleanup

shell meshing for outer surfaces

volume meshing

Quality checks

Procedure:

• The rearview mirror model is imported into ANSA.
• The faces are not stitched together so topo operation is performed to stitch the surfaces.
• The orientation of the model is corrected in such a way that outer surfaces must be in grey colour and inner surfaces must be in yellow colour.

Geometry cleanup:

• The rearview mirror model is checked for all topological errors.
• The errors are rectified using auto-fix option.
• The geometry check is again rerun to check any errors are still occur.

Quality criteria:

The following quality criteria are entered in the quality tab.

Target element length, Minimum & Maximum lengths are assigned in Mesh parameters tab before meshing.

S.NO	QUALITY CRITERIA	VALUE
1	Target length	1
2	Minimum length	0.5
3	Maximum length	2
4	Tet collapse	0.2

Meshing:

• All the perimeter and macros lengths are changed to 1mm.
• The construction lines are arranged properly to get a good flow of mesh.
• Batch Mesh and spot mesh algorithms are used for meshing in order to get proper flow.
• Each and every curved surface is meshed using ortho tria elements for better feature capturing.
• Flat surfaces are meshed using normal tria elements in order to reduce the computational time.

VOLUME MESHING:

• Each part of the shell mesh is defined volume individually by using the volume module in define entity option.
• Tetra Rapid method is used to generate year elements.
• The Tetra elements are then checked for quality issues.
• Tet collapse quality is checked in Volume mesh and it is removed.

CONCLUSION:

Thus the rearview mirror model is checked for geometrical errors and Tetra meshing is performed according to given Quality criteria.

LEARNING OUTCOME:

• Fixing Geometrical errors.
• Meshing Solid parts.
• Volume Meshing.