Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Log in Sign Up. Thesaurus turbulence noun. Save Word. Keep scrolling for more. Save Word. Definition of turbulence. Examples of turbulence in a Sentence The plane hit quite a bit of turbulence during our flight. A period of turbulence preceded the riots. Recent Examples on the Web Spoked wheels are usually swapped out for smooth disks that generate less air turbulencereducing the effort required to move at Turbulence speeds.
First Known Use of turbulencein the meaning defined above. Keep scrolling for more. This theory implicitly assumes that the turbulence is statistically self-similar at different scales. This essentially means that the statistics are scale-invariant in the inertial range. A usual way of studying turbulent flow velocity fields is by means of flow velocity increments:. Flow velocity increments are useful because they emphasize the effects of scales of the order of the separation r when statistics are computed.
From this fact, and other results of Kolmogorov theory, it follows that the statistical moments of the flow velocity increments known as structure functions in turbulence should scale as. There is considerable evidence that turbulent flows deviate from this behavior.
The universality of the constants have also been questioned. In particular, it can be shown that when the energy spectrum follows a power law. However, for high order structure functions the difference with the Kolmogorov scaling is significant, and the breakdown of the statistical self-similarity is clear. This behavior, and the lack of universality of the C n constants, are related with the phenomenon of intermittency in turbulence.
This is an important area of research in this field, and a major Turbulence of the modern theory of turbulence is to understand what is really universal in the inertial range.
From Wikipedia, the free encyclopedia. Motion characterized by chaotic changes in pressure and flow velocity. For the turbulence felt on an airplanesee Clear-air turbulence. For other uses, see Turbulence disambiguation. Unsolved problem in physics :.
Astronomical seeing Atmospheric dispersion modeling Chaos theory Clear-air turbulence Different types of boundary conditions in fluid dynamics Eddy covariance Fluid dynamics Darcy—Weisbach equation Eddy Navier—Stokes equations Large eddy simulation Hagen—Poiseuille equation Kelvin—Helmholtz instability Lagrangian coherent structure Turbulence kinetic energy Mesocyclones Navier—Stokes existence and smoothness Reynolds number Swing bowling Taylor microscale Turbulence modeling Velocimetry Vertical draft Vortex Vortex generator Wake turbulence Wave turbulence Wingtip vortices Wind tunnel.
Introduction to Fluid Mechanics. Coastal Engineering. A First Course in Turbulence. MIT Press. January 17, Philosophical Transactions of the Royal Society A. PMID Oceanologica Acta. ISSN Journal of Meteorological Research. Journal of Geophysical Research: Atmospheres. Bibcode : Sci S2CID Environmental Fluid Mechanics. As many travelers already know, flight crews in the United States tend to be more twitchy with the seat belt sign than those in other countries.
We keep the sign on longer after takeoff, even when the air is smooth, and will switch it on again at the slightest jolt or burble. In some respects, this is another example of American overprotectiveness, but there are legitimate liability concerns.
The last thing a captain wants is the FAA breathing down his neck for not having the sign on when somebody breaks an ankle and sues. With aircraft, this effect is exacerbated by a pair of vortices that spin from the wingtips.
The vortices are most pronounced when a plane is slow and the Turbulence are working hardest to produce lift. Thus, prime time for an encountering them is during approach or departure. As they rotate—at speeds that can top feet per second—they begin to diverge and sink.
As a rule, bigger planes brew up bigger, more virulent wakes, and smaller planes are more vulnerable should they run into one. The worst offender is the Boeing To avoid wake upsets, air traffic controllers Turbulence required to put extra spacing between large and small planes. For pilots, one technique is to slightly alter the approach or climb gradient, remaining above any vortices as they sink. Another trick is to use the wind.
Gusts and choppy air will break up vortices or otherwise move them to one side. Winglets — those upturned fins at the end of the wings — also are a factor. One of the ways these devices increase aerodynamic efficiency is by mitigating the severity of wingtip vortices. Thus a winglet-equipped plane tends to produce a more docile wake than a similarly sized plane without them. Despite all the safeguards, at one time or another, every pilot Turbulence had a run-in with wake, be it the short bump-and-roll of a dying vortex or a full-force wrestling match.
Such an encounter might last only a few seconds, but they can be memorable. Sign up now or Log in. Definitions Clear explanations of natural written and spoken English. Click on the arrows to change the translation direction. Follow us. Choose a dictionary. Clear explanations of natural written and spoken English.
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