Week 6- Challenge

OBJECTIVE: To mesh the given Hood Assembly by following the below-mentioned quality criteria,

Target Element Length = 5mm

PROCEDURE:

The geometry is imported into HyperWorks.

Before extracting the mid surface all the solids are deleted,

Tool Bar>Delete>Solids>All>delete entity

Then mid surface of all the componets are extracted one by one. Once a midsurface is extracted it is renamed to the corresponding components name. All the midsurfaces are also assigned different colors.

All the extracted mid surfaces together,

The required quality criteria’s are set,

Menu Bar>Preferences>Criteria File Settings>Set the values>Apply>Ok

Since there are 4 different components, all the processes are carried out one by one on each component.

1) Outer Extract Body:

To prepare the component for meshing, geometry cleanup is performed.

Geom>Autocleanup

Manual cleanup is also performed if Autocleanup is not perfect.

Since, the component is symmetrical, meshing can be done on one half of the component and then the elements can be reflected to the other half to save time, effort and computing power required.

The surface is split from the middle and meshing is performed on one half of the component,

2D>Automesh>Surfs>Element size=5>Mesh

After meshing, areas containing poor quality elements can be remeshed to try and obtain better quality elements.

Then the quality check of the elements is done with the given quality criteria and the required cleanup is performed with the help of the cleanup tools present like element optimize, place nodes etc.

2D>qualityindex>cleanup tools

After cleanup, the elements are reflected to the other half of the component geometry,

Tool>reflect>elems=select elements to reflect>select the axis to reflect along(y-axis) and center node ’B’>reflect

Again quality check of the elements is done,

Model Check:

Under model check, first the model is checked for free edges. If any free edges are found then equivalence is performed.

Tool>edges>elems>find edges>preview equiv>equivalence

Next, elements to surface edge check is performed. This check is performed to find out how the elements have captured the geometry.

Menu Bar>Mesh>Check>Elements>Comparison>Source entities: Select elements>Target entities: Select Surface>Run

If any ‘Unmatched’ elements are found project it to the surface.

Next, ‘Normals’ of the elements are checked.

Tool>normal>displayed 2D elems>display

The elements having vectors in the opposite direction are reversed.

Tool>normal>elems=select elements to reverse>reverse

To check if any elements are having multiple dependency,

Tools>dependency>elems>dependency

Before checking for ‘penetration’, the component is assigned a thickness by creating a property.

To check for penetration,

Tools>penetration>elems>check.

Similarly, the same procedure is carried out for all the other hood components.

2) Inner Extract Body:

Performing quality check of the elements and doing the required cleanup.

Performing elements to surface edge check,

3) Latch Reinforcement Extract Body:

Performing quality check of the elements and doing the required cleanup,

Performing elements to surface edge check,

4) Hinge Reinforcement Extract Body:

Performing quality check of the elements and doing the required cleanup,

Performing elements to surface edge check,

CONCLUSION:

The given Hood Assembly was meshed according to the given quality parameters. By doing so was able to gain experience on 2D meshing of large components.