Week 3

AIM: The Aim is to do Geometry clean-up of the model, do Meshing of the model, ensure there are no OFF elements, ensure there are no rotating quads, ensure there are no opposite Tria’s, Eliminate Tria’s near free Edge/ Fillets/Holes and the independent Mid surface meshed.

Procedure:

• Initially we import a CAD file to ANSA.

• We then do a geometry Clean up of the cad file in order for us to process the Meshing.
  a) We start with running a topo clean up.

• We run a geometry check to understand the clean-up that has to be processed.

• We start by correcting the geometry clean -up required.

• We start by ensuring that we have only the defined PID for our product useable for us.

• Measure solid body for uniformity/non-uniformity

• Generate Mid-surface using Offset or mid-surface tools depending on non-uniformity or uniformity for all the Features and body.

• Do a topo for the mid surface generated

• Check the orientation of the surface with orientation Tool

• We apply Macro and perimeter length to the entire shell

• We apply parameters of quality to the shell for min, max length and angle also Jacobians, Aspect ratio.

• We then using the measurements with us check for geometry failures and defeature the edges and fillets likely to fail.
  
  
  Correction on both sides

• We mesh the features first

• We start rotating holes to parallel to the edges for better meshing.

• We start meshing by other areas by dividing them into smaller parts

• We mesh the entire body and run another topo and clean up to ensure everything is in order.

• Now we have to use options like Split, join, Swap on elements to try and avoid tria’s created in the corner/fillets.

• We use paste option to join opposite side of tria’s. This is found under Mesh-Grids-Paste
  a) We can paste last node to first
  b) First node to last
  c) Group of nodes to a single point.

• We use Re-construction and smooth to get better results of the meshed elements. These options are found under Mesh- Shell Mesh- Re-construct/Smooth.

• Ensure that there are no off elements

  Conclusion: These sessions have helped understand the importance to have better meshing quality and how to achieve them by the above-mentioned check boxes.