Fluid mechanics is a complex and profound subject, and the knowledge it involves can be applied to many areas of our lives, from our drinking water to the bio-organic materials used to explore the universe, covering almost every aspect of human activity. Of course, in the aspect of hydraulic engineering, the relevant application of fluid mechanics is also essential, such as the relevant numerical calculation in hydraulic engineering, the flow pattern analysis and regulation effect analysis in waterway regulation engineering, and the interaction between fish and fluid, etc. In general, the relevant laws of fluid mechanics have broad application prospects and scientific value, and people are constantly exploring and innovating on the road of studying fluid mechanics, so as to better understand fluid mechanics and apply fluid mechanics.