Week 4- Meshing of Backdoor Challenge
OBJECTIVE:
The main objective of this project is meshing the car backdoor by using the mid surfacing technique & finally using 2D mesh represent the entire model as FE meshed geometry.
CAD MODEL:
The given CAD model is divided in to number of components in order to work on each component Successfully.
PROCEEDURE:
Once the model is divided in to components, the axisymmetric nature of the model is benefited from. In such cases of axisymmetric geometry, only one part of the model is meshed with & the other part is not even geometrically cleaned up.
MID-SURFACING OF MODEL:
However, the mid-surfacing of each individual component is done without the model to be divided asymmetrically. But once the mid surfacing is done then only on one half of geometry the cleanup and meshing is carried out.
GEOMETRIC CLEAN UP:
In the 2D meshing the geometrical clean up is one of the critical processes, which is needed to be followed precisely. As in this process, the unwanted CONS & the edges are removed, which causes in irregularities in the mesh flow & increases the number of Trias.
In the below example, the mesh quality criteria has min length as 3mm, however the con distance is less than 3, such cons are toggled in order to create a proper mesh flow with minimum trias
Some of the regions are critical enough, that the geometrical clean up done by taking that region as separate part which helps to clean & mesh as efficiently as possible.
The above geometry is correctesd as follows, after seperating it in to a new part
GEOMETRIC CLEAN UP – CURVED REGION:
Many a times in the curved regions, unwanted cons are created, which as to be removed.
FILLET DEFEATURING:
Some of the fillets provided in geometry has a radius less than that of minimum length of the mesh. Such fillets are needed to be found out and defeatured in order to avoid the failure of mesh element.
The below ballooned 1,2 & 3 are the fillets, which as fillet radius less than 3mm, such regions are defeatured & meshing is done.
The highlighted fillet 2 is removed and the detailed view of the corrected model is as follows:
MESH ELEMENT QUALITY CRITERIA:
Following is the meshing element criteria followed for this component
MESHING OF ONE HALF:
As mentioned above, the one half of the geometries are initially meshed & the other half is just reflected with respect to the line of symmetry.
The Following is the final meshed component:
LINK FOR THE MODEL:
https://drive.google.com/file/d/1D85Uuf-17YaPtrmMsILILSb3qgESvqwo/view?usp=drive_link
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