Project 2 - 2D meshing on the instrumental Panel

Objective:

For the given component, check for the geometrical errors and mesh with the given element Quality criteria. After meshing the component the thickness has to be assigned.

Write a detailed report on your meshing process and also mention which method you used to extract the mid-surface along with the reason.

S.No	Quality Criteria	Value
1	Target/Average length	4
2	Minimum Length	2
3	Maximum Length	6
4	Aspect	3
5	Warpage	15
6	Skewness	45
7	Jacobian	0.7
8	Minimum Quad Angle	45
9	Maximum Quad Angle	135
10	Minimum Tria Angle	30
11	Maximum Tria Angle	120
10	Tria Percentage	15

ABSRTACT:

In this Project-1,

ANSA pre-processor is used to generate mid surface using various options like casting, offset, middle etc. Created 2D interpretation of the parent geometry. Extended mid surfaces in order to connect all the generated mid surfaces. Mesh the component using spot with given quality criteria. Cleared off elements without any kinks or raised edges.

Procedure:

Import the geometry into ANSA and do topo to stitch the surfaces. Assign PID for the whole geometry. Clean the geometry using checks manager. Enable unchecked faces, collapsed
cons, triple cons, needle faces, overlapped faces, cracks, single cons. Clear all these
issues until no error is found. One can use fix option in ANSA to clear all the errors
automatically. However, sometimes manual intervention is required for fixing some
errors.

• MAKE TOPOLOGY

The model has some minor errors which can be fixed automatically fixed. SELECT THE ERRORS > RIGHT MOUSE CLICK > FIX, this will clear the errors, if errors still exist, manual cleanup needs to be carried out by releasing the cons and fixing the damaged face and performing the topo to fix the free edges.

• Identify the measurement

Before mid-surface extraction checks the thickness of the component if it has a varying thickness, then the best way to extract the mid-surface is by manual mid-surfacing. When the model has varying thickness ANSA algorithm fails to capture the proper geometry, hence the manual mid-surfacing is carried out.

To measure the thickness go to UTILITIES > MEASURE > select the points.

Mid mesh generation using casting for this component in the instrument panel, I have generated mid using casting option.

Tools used:

For the element joining: best option used to get proper surface draw curve

Topo>curve>create

Project

Mesh> shell mesh>project

Fill the mesh

Classic mesh> shell mesh >fill

Meshing and Improving mesh flow

In this mid surface there is lot of double cons nearer to each other. Therefore, lot of
topological clean up should be done before starting mesh.

For this dash board, manual mesh is preferred as it has more features connected with
each other. I have used spot mesh option and meshed region by region manually by doing reconstruct and smooth. I have used smooth option in order to clear some off elements at converging places. For better mesh flow reconstruct option can be used. I have removed opposite trias and trias at the edges using options like swap, split and paste options. some of the element cannot be clear as it is in the complicated part.

• Create Set PID

After completing the extraction of mid surface create a new property ID by using an option FACES>SET PID and give the property values and assign thickness accordingly.

• Quality criteria

After creating the property ID for the midsurface assign the quality criteria parameters which are given.

Learning outcomes:

Able to do topological clean-up with no errors.

Assigned separate PIDs for different surfaces. And done the casting with assign thickness.

Aware of all the quality criteria’s and quality parameters during mesh generation.

Understood about mesh generation and implemented mesh generation for complex geometry.

Learned how to improve mesh flow and remove trias to achieve better mesh flow.
Understood all the concepts regarding mid surface generation and meshing in ANSA.

Conclusion:

In this project, I have generated mesh using casting options available in
ANSA Able to defeature and do line adjustments in some areas and did topological clean up. Understood about transparency mode and the concepts related in generating mid
surface for different features. Able to achieve better mesh flow using smooth, reconstruct, swap, paste, move options. Eliminated kinks and raised edges.
Successfully generated mid surface and meshed whole Instrument panel using ANSA.