they discretize equations of motion. They can predict microscale phenomena such as tornadoes and boundary layer eddies, sub-microscale turbulent flow over buildings, as well as synoptic and global flows.
These models fragment the equations that describe fluid movement. They can forecast minute-scale phenomena such as whirlpools and eddies in fluids, sub-microscale turbulent airflow around objects, in addition to larger-scale and global fluid dynamics.