During the process of importing a model you select a mesh type, or analysis technology, to represent the model shape.
Choose from:
Midplane mesh - which is suitable for thin shell-like models
Dual Domain mesh - which is suitable for thin shelled parts with some thick areas
3D mesh - which is suitable for thick and chunky parts
Automatic meshing is the recommended approach if you have a CAD model. Set up your analysis parameters, launch the analysis, and the mesh is generated automatically. The mesh is automatically refined around injection locations and small model features, and this method generates a good 3D mesh.
Generate or refine the mesh manually, if there are special areas of interest in the model that you want to inspect more closely.