##### Wiktionary

**fluid dynamics**

n. (context physics English) The scientific study of the property and behavior of moving fluids.

##### Wikipedia

**Fluid dynamics**

In physics, **fluid dynamics** is a subdiscipline of fluid mechanics that deals with **fluid flow**—the natural science of fluids ( liquids and gases) in motion. It has several subdisciplines itself, including aerodynamics (the study of air and other gases in motion) and **hydrodynamics** (the study of liquids in motion). Fluid dynamics has a wide range of applications, including calculating forces and moments on aircraft, determining the mass flow rate of petroleum through pipelines, predicting weather patterns, understanding nebulae in interstellar space and modelling fission weapon detonation. Some of its principles are even used in traffic engineering, where traffic is treated as a continuous fluid, and crowd dynamics.

Fluid dynamics offers a systematic structure—which underlies these practical disciplines—that embraces empirical and semi-empirical laws derived from flow measurement and used to solve practical problems. The solution to a fluid dynamics problem typically involves calculating various properties of the fluid, such as flow velocity, pressure, density, and temperature, as functions of space and time.

Before the twentieth century, *hydrodynamics* was synonymous with fluid dynamics. This is still reflected in names of some fluid dynamics topics, like magnetohydrodynamics and hydrodynamic stability, both of which can also be applied to gases.

#### Usage examples of "fluid dynamics".

As the weeks passed, Muzorawa spent more and more of his time training for the coming crewed mission, less and less on the __fluid dynamics__ problem.

The fountain could ignore the laws of __fluid dynamics__ just as easily as it could conform to them.

There are dozens of problems in __fluid dynamics__-let alone neurobiology-which need new approaches, or better approximations, not the ultimate, precise description of matter on a subatomic scale.

Mud is lumpy, but the rules of __fluid dynamics__ don't take account of lumps.

Some proposed an alternative mechanism for the formation of the inner planets based upon analysis of the __fluid dynamics__ of Jupiter's core.

At the University of Paris, he currently occupied the chair of theoretical __fluid dynamics__.

Timothy Wang, a friend of Kathryn's and a first-year cadet in several of her classes, was poised at the podium, beginning his lecture on the __fluid dynamics__ of space shuttles in a thin atmosphere.

Yachts had pleasing linesa certain mathematical perfection dictated by the laws of __fluid dynamics__.

Driven by the same kinematic properties of __fluid dynamics__ that powered tornadoes, the steam's vertical transfer of energy was counterbalanced by an anticyclonic vorticity spiral that circled the shaft, carrying energy in the opposite direction.

From what I've seen of your mathematical description of a powder avalanche I'd say you are using __fluid dynamics__.

You've forgotten that I'm a whiz at __fluid dynamics__, whereas you've never even had a course in it.