Week 5 Challenge : Surface wrap on Automotive Assembly
Aim
To merge the Engine, Transmission and Gear Box into a one model.
Generating Surface wrap with target length of 3mm around merged model to have a common volume.
Introduction
The surface wrap is used to create a watertight surface mesh which replicates the exact geometry of model. the surface wrap is used to perform the external flow analysis which do not require any internal components. The accuracy of surface wrap depends on the element size of mesh, smaller the element size better is the feature capturing of small and intricate parts. For generating smaller sized mesh, the time reqired is also high. So a proper balance between selection of mesh element size and computational time becomes critical.
Methodology
- All three models like Engine, Transmission, Gear Box model are imported and are checked one by one for any unwanted surfaces present and if any single cons are present. Topo cleanup is done by deleting such unwanted surfaces like extra ring like structure protruding from geometry, extra edges on surface.
- Then the geometry need to be closed i.e holes need to be filled by using New-Coons/Fitted. The open holes results in surface distortion during wrapping the model. The final topo cleaned model are as shown in figure 1(a),(b),(c).
Figure 1(a): Engine
Figure 1(b): Gear box
Figure 1(c): Transmittion
Merging
The all three models are to be merged by using, Files-Merge. The final merged model is as shown in figure 2.
Figure 1(c): Merged Model
Surface Wrapping
- Mesh deck is opened to wrap the surface using ''Constant Length'' in wrap tool.
- Mesh Deck-Elements-Wrap-Constant Length - New
- Untitled- Castellation-enter mesh length-
- Mesh - Smooth Factor of 0.5 - Nodes out of Surface - Assign properties from structure
- Select '0' - Give a name - And select all PID's bt (cntrl+A) - by presing green arrow PID's will move to Octree Scenario
- Then select Run and surface wrap will take place. An final surface wrappede model is shown in Figure 3
Figure 3: Surface Wrap
Figure 4: Suface Wrap
Conclusion
The combined Powertrain model is surface wrapped successfully with element size of 3mm.
Model: https://drive.google.com/file/d/1zX5Q-cDzRYGMQR3PIMUqm_qFvTrIP_4z/view?usp=sharing