Here are some advises to perform an efficient meshing in your 3D projects:

In all the basic geometries, use the aided mesh. To refine this first mesh simply, remove aided mesh information on entities (relaxation on some lines or faces, for instance) or add mesh points.

For most medium and advanced cases, the recommendation is to set a simple manual mesh definition.

• De-activate the aided mesh,
• Assign the predefined discretizations to the points of each region (LARGE for the air volumes, MEDIUM for all the other regions and SMALL for details),
• Add a different mesh point for each region if needed,
• Add relaxations or shadow mesh if you want (relaxation of air volume for example),
• Adjust the discretizations values.