Week 6-Meshing of Hood Challenge

PREPOCESSING OF HOOD USING HYPERMESH.

AIM:- To extract the midsurface & generate mesh on hood using Hypermesh.

MODEL

STEPS INVOLVED:-

1. Geometry Cleanup

2. Midsurface extraction & assigning properties.

3. Meshing with given quality criteria.

QUALITY CRITERIA:-

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
11	Tria %	10

PROCEDURE:-

Step 1: Geometry cleanup:- Once the file is imported, model is checked for geometrical error like needle faces, triple cons, damage surface.

Step 2: Midsurface extraction:-

• Mid-surface can be extracted by any of the 4 methods below.
  1. Offset + plane + sweep.
  2. Offset + plane.
  3. Offset
  4. Skin Offset.

• To extract the mid-surface, go to geom >> mid-surface >> select any extraction option >> select the surface >> extract. In this challenge offset + plane + sweep is used.
• After extracting the mid-surface, it is checked for any geometrical errors like needle faces, missing surfaces and triple cons. If any of the errors present then it should be rectified immediately.
• Now the properties like thickness, material etc. need to be assigned to the mid-surface. To assign the properties, select model in database and right click and choose create and then property.
• To assign the properties to mid-surface, right click on the mid-surface and then select assign and select the respective properties which needs to be assigned.

Step 3: Generating mesh within the given quality criteria:

• Before generating mesh, the geometry is cut into smaller rectangles for good mesh flow.
• To generate mesh, go to 2D >> automesh >> select the surface >> mesh. To edit the mesh for proper flow, the elements are selected and meshed again.
• If any elements are failing for quality then cleanup tools option which is present in quality index can be used.

CONCLUSION:-For the given hood panel mid-surface is extracted and mesh is generated with in the given quality criteria.