What is fluid dynamics and how does it study moving fluids?

Fluid dynamics is a subdiscipline of fluid mechanics that focuses on the natural science of fluids in motion, including both liquids and gases. It provides a systematic structure for calculating properties such as flow velocity, pressure, density, and temperature as functions of space and time. The field has diverse applications ranging from calculating forces on aircraft and predicting weather patterns to understanding nebulae in interstellar space.

What we know

• Fluid dynamics is a subdiscipline of fluid mechanics that deals with the flow of liquids and gases. [1, 2]
• The solution to a fluid dynamics problem typically involves calculating properties like flow velocity, pressure, density, and temperature over space and time. [2]
• Fluid mechanics can be divided into fluid statics for fluids at rest and fluid dynamics for studying the effect of forces on fluid motion. [3]
• Before the twentieth century, hydrodynamics was synonymous with fluid dynamics. [2]

Still open

• Many problems in fluid dynamics remain partly or wholly unsolved and require numerical methods via computers.

Where to go next

• the bigger pictureWhat is fluid mechanics?
• a case in pointHow does aerodynamics study air in motion?
• how it workedHow do eddies form in turbulent flow regimes?
• how we knowHow does computational fluid dynamics model complex problems?
• compared withHow does fluid statics differ from fluid dynamics?
• an unexpected connectionHow does fluid dynamics help explain nebulae in interstellar space?Although typically associated with engineering and weather on Earth, fluid dynamics principles also apply to understanding large-scale celestial phenomena like nebulae in interstellar space.

Sources

• [1]fluid dynamics (Wikidata Q216320) · CC0 1.0
• [2]Fluid dynamics · CC BY-SA 4.0
• [3]Fluid mechanics · CC BY-SA 4.0
• [4]Eddy (fluid dynamics) · CC BY-SA 4.0
• [5]Dynamics (mechanics) · CC BY-SA 4.0