Week 5

Objective: 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.

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

Procedure: Perform topo so that some geometrical errors can be fixed.

Then perform geometry cleanup and fix the issue automatically and manually

After geometry clean up performs surface mesh:

The Spot Mesh algorithm gives better results than the free meshing method and creates the optimum number of shell elements, taking into account the element type already selected and the defined meshing parameters.

Select the proper element type, using the Mixed, or Quad, or Tria (Ortho Tria)option.
At all types and methods of ANSA meshing, the element nodes lie precisely on the CAD-surface.

Define volume: This function automatically defines multiple volumes using already meshed macros or FE-model mesh.

Activate the Define function.
1. Two modes are available (one at a time) for the definition of the closed volume, according to the flag that is activated in the MODE window that appears on the screen.

2. If the AUTO flag is active then, by selecting a Macro Area, an automatic search is performed and all neighboring Macro Areas that may compose a closed volume become highlighted. Deselect any of the highlighted Macro Areas with the left mouse button, if they should not participate in the closed volume.

3. If the MANUAL flag is active, the user can select or deselect the Macro Areas or FE-Model shells that will compose the closed volume.

After this set Vol PID to all different components:

Then perform 3D Mesh using the below option:

1. Tetra Rapid:

The Tetra Rapid algorithm meshes the Volume with Tetra Elements.

The maximum growth rate, which is the approximate growth factor of volume element size from layer to layer while the generation moves towards the interior of the Volume.

- Maximum Element Length. Specify the maximum allowable length of the tetra elements to be generated. Useful when specifying a growth rate factor while keeping the length of the elements below a certain value.

2. Tetra FEM:

This function automatically creates a Tetrahedral mesh inside selected Volumes, initially with pyramid elements if the starting surface mesh contains quad elements. It is to be used mainly for structural applications. Volumes to be meshed with this function must have been defined using the Define(Volumes) function.

Mirror Support

Rotating Ball

Mirror

Quality Check

Conclusion:

1. Learned to use volumetric mesh and the difference between the structured and unstructured mesh.

2. Difference between Tetra Rapid & Tetra FEm.

3. Learned to clean collapsed elements in the model.