Assignment 1
Task:- To perform 2D shell meshing of the given components with a prescribed element quality criteria.
Tools used:- Quick edit, autocleanup, automesh, surface edit, replace, reflect, rotate, etc.
Procedure:-
- For each of the three components, we must extract the midsurface and perform a 2D shell mesh which had a target element length of 5 mm. And any feature hole of below 5 mm shall be defeatured. After opening the given .hm file, we must ensure that there are no solids present in the component.
- By setting the viewing options to "By mixed" & "By Component", we shall be able to view any irregularities present in the model such as a degenerate surface, duplicate surface, missing surface, or deformed faces. We must ensure that the surface geometry is improved by providing appropriate surface improvement treatment. One such surface improvement is shown below;
- In the above example, a surface was incomplete in the sence that it was overextending the boundaries because the edge was not formed due to an unextended side on the thickness side. This problem was eliminated by extending the width-side face upto the overextended surface from Surface Edit option. The edges now formed are colored by green indicating a complete surface definition.
- On a few other locations, some surfaces were missing, which was treated by toggling any of the two sides or using the filler option in the Quick edit options.
- After the geometry topology refinement, we must edit the criteria and parameters settings according to what has been specified in the task. We must now apply an autocleanup. This process will ensure that holes with less than 5 mm diameter will get defeatured.
- Now at this stage, we extract the midsurface. Care must be taken in the extraction options, and best result from :- "Offset+planes+sweep" , "Offset+Planes" , "Skin offset" , "Offset", must be selected.
- Then follows the mesh generation process. Since the specified element criteria is coarse for the given component geometries, we must ensure that the element is not failing in size atleast.
The meshed components from each of the three files are shown in the images below;
This marks the completion of this exercise of geometry topology refinement and 2D mesh generation.