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Pairing Unopposed Surfaces
If you want to create shell elements but have a surface with no opposing surface, you have three options. The option you choose depends on your particular modeling needs.
Use one of the following methods to resolve unopposed surfaces:
Suppress the feature—Suppress the feature that causes the problem. This saves both modeling and calculation time, but also sacrifices the most in model accuracy.
Create an opposing surface—Create a small feature to give the unopposed surface a pairing mate. Note, however, that this method has a dimensional impact on the finished mesh.
Split the surface—Split the surface and distribute it among its neighboring surface pairs. This procedure, while sometimes difficult, does the best job of retaining model accuracy.
Return to Creating a Partial Shell Mesh.