To supply hydrodynamic parameters for ship launching, computational fluid dynamics(CFD) method was used to analyze the process of longitudinal gravity launching for ship from a slipway.

The stepped low-pressurized water diversion system is a new type of gravity water supply system, which is simple in structure and water conservation weir is the pivotal structure.

This paper describes how to apply double-coded self-adaptive genetic algorithms based on gravity to supply water to optimize the design of pipe networks.