Week 6-Meshing of Hood Challenge

Objective : Mesh the hood components with given quality critera.

Procedure :

Import Geometry :-

• First of all import Hood model using import tool. we have four different components (Inner panel , outer panel, hinge reinforcement, latch reinforcement).

• Then we have to clean up geometry of component and extract the misurface. Midsurface extraction,Geometry Cleanup and meshing of each components are done seperately.

Midsurface Extraction :-

• For midsurface used midsurface option in "geom" tool, selected all surfaces of component and performed extraction of midsurface.
• Each component of hood has separate midsurface.

Geometry clean up :-

• Once midsurfaces are extracted from the model, geometry clean up of the surfaces should be done before meshing.
• Geometry cleanup is done by manually using "quick edit" and "Surface" tool.
• Clean-up is removed all connectivity errors and restored the surface data to a perfect representation of component.

• Appropriate cuts are created and unwanted edges are toggled using quick edit tools.Larger surfaces are further divided to smaller surfaces for proper meshing.

Asigning Quality criteria :-

• Given quality criteria is Target Element Length = 5 Units

  S.N	Quality Criteria	Value
  1	Aspect Ratio	5
  2	Skewness	45
  3	Warping	15
  4	Taper	0.5
  5	Min. Length	2 Units
  6	Max. Length	8 Units
  7	Min angle Quad	45
  8	Max angle Quad	135
  9	Min angle Tria	20
  10	Max angle Tria	120
  10	Tria %	10

• To give quality criteria used tool in status bar "Preference", Criteria file setting, 2D and give criteria then clicked apply.

Meshing :-

• After clean up operation meshing of component should be done.

• Things to Remember while Meshing

  • Use the 'Mixed' (Not Quad) option to generate the mesh for this challenge because we are preparing the model for crash & safety simulations. The quad-only mesh is preferred for durability and structural simulations.
  • The minimum length errors in the Hemming regions are acceptable because the hemming region has a very small cross-section when compared to our minimum length. If you want to avoid the minimum length error in the hemming, follow the below procedure
  • Toggle all the split lines which are all less than the minimum length.
  • Go to midline option (Geom → lines → Midline)
  • Select the two fillet edges on the hemming portion and create a mid-line.
• To mesh the component used "2D tool" Select Auto meshing, select surfs, give Element size, Select Mesh Type as mixed and Clicked Mesh.

• To mesh of hoods inner and outer panel, one side of inner/outer panel is only meshed and using "reflect" tool reflect the mesh elements on other side.
• To reflect elements used "tools",reflect, select elements and made duplicates of elements and store them in current components and select z axis center to reflect the elements.

Meshing of Hood inner Panel

Meshing of Outer panel

Meshing Of Hinge Reinforcement

Meshing Of Latch reinforcement

Conclusion :

• Created midsurface and gave proper mesh to all components of hood.