A 3D mesh represents the CAD model by filling the volume of the model with four-node, tetrahedral elements (tetra).
3D meshes work well for parts that are thick or solid because tetra give a true 3D representation of the model. A 3D analysis does not make the assumptions that are made for Midplane or Dual Domain analyses. Therefore, 3D analyses often require additional computational time to complete. This makes a 3D mesh more appropriate for thick models with complicated shapes, while Midplane and Dual Domain meshes are more applicable for thin-walled, shell-like parts.
