A branch of fluid mechanics.

1, Hydrostatics: Hydrostatics or hydrostatics is a branch of fluid mechanics that studies static fluids. It includes the study of the static conditions of the fluid in a stable equilibrium state; Contrary to fluid dynamics, fluid dynamics is the study of moving fluids.

2. Fluid dynamics: Fluid dynamics is a branch of fluid mechanics, which studies fluid flow-the movement of liquid and gas. Fluid dynamics provides a system structure, which is the basis of these practical disciplines. This system structure contains the experience and semi-empirical rules obtained from flow measurement to solve practical problems.

Second, the research content

1, aerodynamics: study the flow characteristics of air and its influence on objects. This paper mainly studies the velocity, pressure distribution and resistance of airflow, including airfoil aerodynamics and rocket aerodynamics.

2. Fluid mechanics: study the flow law of water and its influence on engineering and environment, such as the flow properties of rivers, oceans, lakes and other water bodies. Applications include river and ocean engineering, water resources management, etc.

3. Particle hydrodynamics: study the fluid containing solid particles, study the interaction between particles and fluid, the movement law of particles and the mixing of fluid particles. The application fields include powder conveying, granular material treatment and so on.

4. biofluid mechanics: Study the flow law of liquid or gas in living organisms, such as blood and airflow in airways. It is applied in the medical field and has important research value in cardiovascular diseases, respiratory system and so on.

Formation of Branches and Interdisciplinary Subjects

Since the 1960s, fluid mechanics began to cross with other disciplines, forming a new interdisciplinary or marginal discipline, such as physical and chemical fluid mechanics, magnetohydrodynamics and so on. At first, it was only a qualitative problem, and gradually there was a quantitative study. Biorheology is an example.

On the basis of these theories, in the 1940s, a new theory about detonation wave in explosives or natural gas became, and the explosion wave theory was developed to study the propagation of shock wave in air or water after the initiation of atomic bombs and explosives.

Since then, fluid mechanics has developed many branches, such as hypersonic aerodynamics, supersonic aerodynamics, rarefied aerodynamics, electromagnetic fluid mechanics, computational fluid dynamics, two-phase (gas-liquid or gas-solid) flow and so on.