Meshing of Hood Challenge

Objectives: To obtain a 2-D mesh for the given car hood

Workflow:

CAD

Mid-surfacing

• Individual midsurfaces are obtained using auto extraction option.

Symmetry:

On examining the different components we observed that all components are symmetric about XZ plane and hence we will move forward keeping this in mind to reduce the effort while geometric cleanup and meshing.

Geometric Cleanup

• Geometric cleanup was carried out for individual components to remove unwanted surface splits and non-feature splits.

2-D Mesh

• Using 2-dimensional elements size and bias option, a mesh is generated using a mixture of quadratic and triangular elements with size of 5 units
• Flow option used: Align (this is to produce a more orthogonal quad-dominant mesh)
• Map option: Size (to keep the elements roughly the same size) & Skew (to Prevent the mesh from producing highly-skewed elements)
• Using Reflect sub-panel, the mesh for the half model is reflected considering XZ plane as the pane of symmetry

Quality Index:

Parameters maintained while meshing:

• 786 elements failed for minimum size in outer extract (all in Hemming region)
• 3 elements failed for Jacobian in inner extract (in bent regions)

RESULT: A 2-dimensional mesh for given car hood is obtained within given parameters.