Thank you for your reply

I could understand the operation method. However, I do not understand the idea.

Is it better to divide the boundaries of the model more?

Also, are the smoothness, angle, and orthogonality of the elements related to the quality of the mesh?

What is important when moving mesh data from ANSYS FLUENT to ICEM CFD?

How can I block the shape of the bottom of the ship (fusiform shape)?

thank you