Challenge

Week 3 - 2D meshing for Sheet metal

Aim:

To create a high-quality mesh model of a component, ensuring that it conforms to specific requirements, such as correct mid-surface, good mesh flow, no rotating quads, opposite triangles, and eliminated triangles near free edges, holes, or fillets, and with zero OFF elements after applying quality criteria.

Process flow:

Work Procedure:

With respect to the given Hood interior panel, create the mid surface for all the components after checking the geometrical errors and create the mesh the mid surface with the given element Quality criteria.

Importing CAD geomentry:

Orient operation:

Use the orient function to align every surface in one particular direction, either green or yellow, for easy meshing flow.

CAD geomentry checking:

Check geomentry with check manager for single cons, double cons, triple cons & needle faces.
Here the showing above error occured in the geomenty cad.
We can fix these errors with auto fix.
If the ansa cannot some errors by automation,for which we need to fix the error by manually.

Fixing errors:

fix errors that appear such as extra lines through the fix option, needle face errors, or triple cons and do manually using the cut and join options in the Topo module.
Delete the unwanted surfaces
Erase the unwanter cons & curves.

B. Mid surface data creation

Mid surface is the surface creating mid of the two connected surfaces
Using the measurement option, measure the component thickness to check if it is equal everywhere or if it varies, which will affect the creation of the mid-surface.
If the thickness is the same everywhere, I create the mid-surface and mesh it easily.
Choose the mid-surface option to create the mid-surface.
Here offset tool is used for creating MS because component's thickness is equal everywhere and it creates automatically and accurately in less time.

Thickness for Mid surface:

C. Mesh creation

The mesh genration is using for simulation solver for all the process.
As well as to be confimed the mesh sizes & lenght of the meshes.
The mesh flow should be proper.
Before the mesh creation we have to set the quality criteria for the genrating mesh on MS.

Quality createria

Check the mesh quality to ensure that it meets the desired criteria and make any necessary adjustments.
The following figure showing quality criteria set by user which was given.
The mid surface mesh data should be passed the defined quality criteriae.

During the meshing process, some errors and off elements occur, such as maximum or minimum element length triangles touching each other. To resolve this issue Adjust the mesh density or refine it in areas where errors or off elements are present.
For resolves the not passed creteria,used smooth or reconstruct the meshes for and use split and paste option to move the trias backward forward swap it and correct.
Some were specially in edge area the elements get fails and create disturbance elements where can bevdone some smooth option after that moving trias and quad elements in right place.

Outcomes:

Importance of topology cleanup and surface smoothing in creating a high-quality mesh model.
Knowledge of techniques for eliminating rotating quads and opposite triangles, and for eliminating triangles near free edges, holes, or fillets.
Understanding the importance of applying quality criteria for mesh genration to ensure zero OFF elements.
Further improvement for cleanup cad & mesh have to achive in coming projects.

Conclusion:

By above the steps outlined in the procedure, it was possible to create a high-quality mesh model of a component that meets specific requirements, such as a correct mid-surface, good mesh flow, no rotating quads, opposite triangles, and eliminated triangles near free edges, holes, or fillets, and with zero OFF elements after applying quality criteria.

Note: The ansa file with geomentry & nastran file has been attached.

Ship work like this
in your own course.