Week 5

AIM:-

• For the given component, check for the geometrical errors and mesh with the given element Quality criteria.
• Use tetra elements to model the component and there should not and kinks and dips on the surface of the component.

PROCEDURE:-

1) IMPORTING THE CAD MODEL:-

• Open the ANSA software and import the cad geometry by clicking on File>Open>Browse the file from the list. Click OK.

• We can give the Length Parameter as 1 for the better visualization and to refine the model for our workability by going to Mesh Module, under Parameter tab click on Length. Give Length as 1.
• Perform the topo function to arrange the faces and geometry of the model by selecting the Topo Module>Faces>topo. then make a box selection over our geometry.
• Middle Click.

2)GEOMETRY CLEANUP:-

• After doing the topo, we can do the Geometry Check, by clicking on the Checks tool on Tools toolbar.
• From the window appearing, check in the check list as our requirement, it include options like Unchecked faces, Collapsed Cons, Triple Cons, Needle Faces etc. Click on EXECUTE.

• The errors appered can be eliminated by Auto Fix, If the auto fix can't eliminate the error we should do it manualy.
• After clearing all the errors again do the Check.
• IF the window shows 100% with a green strip then your geometry is ready.

3) SETTING THE QUALITY CRITERIA:-

• Setting the quality criteria as give. Minimum and maximum length is for surface mesh and Tet colapse for volume mesh.
• Also the target length is set to 1

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

4) Surface Meshing:-

• There are total 4 parts in this model
• 1) Mirror 2) Mirror Holder 3) Ball Joint 4) Stand
• Each part is Meshed using ortho trias or normal trias.
• Ortho trias are mainly used in areas where there is complex shapes or curved areas, like fillet region.
• Normal trias are used in areas where it is flat.
• Meshing is done by using Spot.Mesh under mesh generaton in Mesh module also after spot mest we can use reconstruct to get a good pattern.

5) Volume Meshing:-

• For volume meshing first we have to define the volume.
• For that click on Define under Volume in V.Mesh module. Choose manual
• Select the part. Set property ID.
• Then select List in the Volume .
• You can see that the part is unmeshed and undefine.
• Right click on it, Select remesh.
• Select Tetra Rapid or Tetra FEM.
• Click ok.
• Then the Volume mesh is formed for that part.
• Do this for each part.

LEARNING OUTCOMES:-

• From this I have learned to make Volume and Volume Mesh.
• How to solve the errors in Volume mesh like TetCollapse.
• Use of Ortho trias and normal trias

CONCLUSION:-

All geometrical errors are cleared and meashing is done with the givien criteria. The Shell is having a total of 121778 trias and volume is having 599430 tetras.