The fluid is a general term for gases and liquids. Anywhere in the people's lives and production activities can be encountered in the fluid, the fluid mechanics is closely related to human daily life and production career. Air and water is the most common of the two fluids, the atmosphere surrounding the entire planet, 70 percent of the Earth's surface is the surface of the water. Atmospheric motion, sea water sports (including waves, tides, mesoscale vortex, circulation, etc.), even the depths of the Earth lava flows are fluid mechanics research.
The early 20th century, the emergence of the world's first one aircraft, aircraft and other aircraft has developed rapidly. 50 years of the 20th century {BANNED} the beginning of space flight, human activities extended to other planets and galaxies. The vigorous development of the aerospace industry is closely linked with the development of the sub-discipline of fluid mechanics - aerodynamics and gas dynamics. These subjects are most active in fluid mechanics, the most fruitful field.
Oil and gas exploration, development and utilization of groundwater, requires an understanding of the movement of fluids in porous or gap medium, which is one of the fluid mechanics branch - the study of fluid mechanics in porous object. Seepage mechanics involved in the prevention of soil salinization, chemical concentration, separation, and the porous filter, the combustion chamber cooling technology.
Combustion can not be separated from the gas, which is a chemical reaction and thermal changes in fluid mechanics problems, one of the physical - chemical fluid dynamics. The explosion is a violent instant energy change and delivery process, involving gas dynamics, thus forming the explosion.
Migration of desert, river sediment movement in the pipeline coal transportation, the movement of gas catalyst chemical, are involved in the fluid with solid particles or liquid with bubbles and other problems, such problems is the scope of the study of multiphase hydrodynamics . Plasma of free electrons with the same amount of positively charged ions and neutral particles of the aggregates, plasma in the magnetic field under the special law of motion, the discipline of the law of motion of the plasma is called plasma dynamics and electromagnetic fluid dynamics, a wide range of applications in the controlled thermonuclear reaction, MHD power generation, cosmic gas movement.
Role of wind on buildings, bridges, cables, etc. so that the load bearing and vibration excitation; exhaust gas and wastewater emissions are causing environmental pollution; scour migration and coastal erosion; study the fluid itself, the movement and its human, animal and plant interaction of the discipline known as environmental fluid dynamics (including environmental aerodynamics, building aerodynamics). This is a classical fluid mechanics, meteorology, oceanography, and hydraulics, and structural dynamics of the emerging interdisciplinary.
Biorheology the study of human or other animal and plant related to fluid mechanics problems, such as physiological fluid movement in the blood flow in blood vessels, heart, lung, kidney, and the delivery of the plant nutrient solution. In addition, the study of birds flying in the air, animals in the water swimming, and so on, therefore, fluid dynamics includes both the basic theory of the natural sciences, it also involves the application of engineering science. In addition, from the point of view of the fluid force can be divided into fluid statics, fluid kinematics and fluid dynamics; points from the study of the mechanical model, the ideal fluid dynamics, viscous fluid dynamics. incompressible fluid dynamics of compressible fluid dynamics and non-Newtonian fluid mechanics.