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Hydrodynamics simulation of the Rayleigh–Taylor instability [3] Unstable flow structure generated from the collision of two impinging jets.. Fluid instabilities occur in liquids, gases and plasmas, and are often characterized by the shape that form; they are studied in fluid dynamics and magnetohydrodynamics.
This is an image, captured in San Francisco, which shows the "ocean wave" like pattern associated with the Kelvin–Helmholtz instability forming in clouds. The Kelvin–Helmholtz instability (KHI) is an application of hydrodynamic stability that can be seen in nature. It occurs when there are two fluids flowing at different velocities.
Atmospheric instability is a condition where the Earth's atmosphere is considered to be unstable and as a result local weather is highly variable through distance and time. [ clarification needed ] [ 1 ] Atmospheric instability encourages vertical motion, which is directly correlated to different types of weather systems and their severity.
This process identifies a combustion-instability region and attempts to either eliminate this region or moved the operating region away from it. This is a very costly iterative process. For example, the numerous tests required to develop rocket engines [ 4 ] are largely in part due to the need to eliminate or reduce the impact of thermoacoustic ...
Dynamic instability may refer to any of several scientific phenomena: Aircraft dynamic modes, including aircraft dynamic instability; Atmospheric instability, in meteorology; Dynamic instability of microtubules, in biology; Firehose instability, in astrophysics; Flutter, in aeroelasticity, a branch of mechanics; Hydrodynamic instability, in ...
Elastic instability of a rigid beam supported by an angular spring. Elastic instability is a form of instability occurring in elastic systems, such as buckling of beams and plates subject to large compressive loads. There are a lot of ways to study this kind of instability.
Traditional definition of the crisis stability belongs to Schelling: the crisis is stable "if neither side has or perceives an incentive to use nuclear weapons first out of the fear that the other side is about to do so". [32] Crisis instability is one pathway through which a political or conventional armed conflict can turn nuclear. [33]
Instability results from difference between the adiabatic lapse rate of an air mass and the ambient lapse rate in the atmosphere. [2] If the adiabatic lapse rate is lower than the ambient lapse rate, an air mass displaced upward cools less rapidly than the air in which it is moving. Hence, such an air mass becomes warmer relative to the ...