Aerodynamics

Aerodynamics is a branch of fluid dynamics concerned with the study of gas flows, first analysed by George Cayley in the 1800s. The solution of an aerodynamic problem normally involves calculating for various properties of the flow, such as velocity, pressure, density, and temperature, as a function of space and time. Understanding the flow pattern makes it possible to calculate or approximate the forces and moments acting on bodies in the flow. This mathematical analysis and empirical approximation form the scientific basis for heavier-than-air flight.

Conservation laws

Aerodynamic problems are solved using the conservation laws, or equations derived from the conservation laws. In aerodynamics, three conservation laws are used:

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

• Conservation of mass: Matter is not created or destroyed. If a certain mass of fluid enters a volume, it must either exit the volume or increase the mass inside the volume.
• Conservation of momentum: Also called Newton's second law of motion
• Conservation of energy: Although it can be converted from one form to another, the total energy in a given system remains constant.

All aerodynamic problems are therefore solved by the same set of equations. However, they differ by the assumptions made in each problem. The equations become simpler as assumptions are made.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Note that these laws are based on Newtonian Mechanics. They are not applicable in relativistic mechanics, which takes into account Einstein's theory of relativity. all the problem related to energy conservation must be well known

Related Topics:
Newtonian Mechanics - Relativistic mechanics - Einstein - Theory of relativity

~ ~ ~ ~ ~ ~ ~ ~ ~ ~