Week 6-Meshing of Hood Challenge

OBJECTIVE: To create midsurfaces and mesh the given components by satisfying the required quality criteria.

PROCEDURE:

Import Model:

• To import the cad model, goto New model > import geometry and select the file to import.

• As only shell meshing is to be performed, Solids are not necessary. Hence, Goto Delete > Solids and delete all the solids present in the model.

Midsurface generation:

To create the midsurface for the components. goto Geometry > midsurface, select Skin offset from the extraction options and select the surfaces to extract midsurface from and then click on extract.

Geometry CleanUp:

• To start with, goto Geometry > autocleanup and enter the target element size as 5 in the edit criteria and edit parameters menu.
• Select the surface to be clean up and click on autocleanup.
• The autoclean function generates washers automatically.
• Manual cleanup can be done by using the quick edit > toggle edge, quick edit > split surf, quick edit > washer spilt, quick edit > unsplit surf, quick edit > project point and quick edit > replace point.
• Remove all the unnecessary points by using the quick edit > add/remove point.

Individual component creation:

• To assign the different surfaces to individual components, Right click on the Model browser and click on Create > Component.
• Then in then panel area goto Tool > Organize, Select the surface and the respective component to which it has to be assigned and click on Move.

Property Creation:

• To create a property, right click on the model browser and click on Create > Property. Choose the card image as PSHELL and enter the required thickness.
• To assign a particular property to a component, goto that component and click on property and select the desired property card.

Quality Criteria File Settings:

To define the required Quality criteria, goto Preferences > Criteria File Settings > Criteria Editor and enter all the required criteria.

Mesh Generation:

• Next in order to mesh the surfaces, goto 2D > Automesh and enter the mesh element size = 5.
• Choose the surface to be meshed and click on the mesh button.
• To check the element quality, goto Tools > Check elements or press F10 or goto 2D > elem cleanup.
• The failed elements can be corrected by using the elem cleanup or the elem quality index > cleanup tools or using any of the manual operations.

Final Checks:

• To check if there are any duplicate elements present, press F10 > duplicates. If duplicates are present, then click on save failed and goto Delete > elements > retrieve and delete the excess elements.
• Goto Tools > edges, select the surfaces and click on find edges to check if any of the elements are disconnected from the neighbouring elements. To rectify this, click on equivalence or goto > 2D replace and join the nodes manually.
• To check the normal of the elements, goto Tools > normals > elements > displayed elements and click on display. To invert the normals, click on reverse. If any of the elements are not aligned to the neighbouring element's normals, click on adjust or then select those elements and click on reverse.
• To check if the surfaces and the elements overlap each other correctly, goto Mesh > Check > Elements > comparison and choose the target and sources. Enter the tolerance value and click on Run.

Reflect:

To reflect the symmetrical portion of the components, goto Tools > reflect > elements, select the required elements and choose the nodes N1, N2, N3 and B or select the axisby which the elements have to be reflected upon. Click on reflect.

Note:

• Enable 2D detailed Element representation to view all the elements thickness.

Result :

Thus, the components in the given model are meshed with element size = 5 units by satisfying the required quality criteria and the thickness was assigned to all the componenets.