Week 6-Meshing of Hood Challenge

Aim:-

clean up geometry,create midsurface and meshing on its as per quality criteria.

*methodology:-

1) import a model

2) create midsurface

3) clean up geometry

4) meshing as per quality criteria

5)reflection of symmentric components

6)check for free edges

*model name:-

hood.stp

1) import a model:-

-The format of the file is stp, then first of all select import solver deck command, choose import geometry type and select file type is STEP.

-now select the file from our folder and import it.

-but it is not visible on our screen due to graphical issue , for that use f key and then its visible.

-here not seen lines perfectly, it means not seen surfaces properly, for that use topo commnd.

-there are symmentrical geometry are available of inner extract, outer extract and hinge reinforcement. due to that we cut from middle of that and work on the one side of body, and after the all work done we replace another side. this concept use for save the time and reduce our works.

2)create midsurface:-

-after that next step is midsurface creation.

-we use automidsurface command and select all surfaces using display opction and then midsurface extraction.

(geometry>midsurface>auto midsurface)

3) geometry cleanup:-

-after the mid surface extraction next step is geometry cleanup.

-it is required for achieve better result of mesh flow.

-if distance between two adjustance surfaces is lessthen the value of minimum size given by the designer, then its always fail for minimum size, due to that geometry cleanup are main part of any preprocessing software.

-all components after mid surface & geometry cleanup:-

Inner panel:

Outer panel:

Hinge:

Latch:

4) meshing as per quality criteria:-

-now next step is meshing on all components as per given quality criteria.

-Target Element Length = 5mm

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

-for that we use automesh command.(2D>automesh)

-after that remesh of the component some elements by elements for best result of meshing.

5)reflection of symmentric components:-

-after the meshing on every surfaces next step is reflet the symmentric components to another side.

-for that use refect command.(tool>reflect).

6) check for free edges:-

-now we check any free edges are available in a model or not.

-for that first of all go to the edges command.(Tool>edges)

Final model:

*conclusion:-

-the given car hood model is properly meshed as per given quality criteria.

Learning outcome:

1. Learned how to separate a model into different components for ease of modeling.
2. Defeaturing certain regions of the geometry in order to improve element quality.
3. 2d meshing for a given model.