vortex

…a central downdraft are termed vortexes and occur where coastal and bottom configurations provide narrow passages of considerable depth. Slightly different is vortex motion in streams; at certain stages of turbulent flow, rotating currents with central updrafts are formed. These are called kolks, or boils, and are readily visible on…

Eddies or vortices (whirlpools) so produced can also cause sound. Many sounds, both natural and man-made, occur in this way.

…pattern that it represents, is vorticity. In a sample of fluid that is rotating like a solid body with uniform angular velocity ω₀, the vorticity lies in the same direction as the axis of rotation, and its magnitude is equal to 2ω₀. In other circumstances the vorticity is related in…

…eddy, known as the starting vortex, is still in view. The circulation around the closed loop shown by a broken curve in this diagram was zero before the eddy formed and, according to Thomson’s theorem (see above Potential flow), it must still be zero. Passing through this loop, there thus…

…of Hydrodynamic Equations to Which Vortex Motions Conform.” This was not only a mathematical tour de force, but, for a brief time, it also seemed to provide a key to the fundamental structure of matter. One of the consequences that flowed from Helmholtz’s mathematical analysis was that vortices of an…

…Helmholtz of the permanence of vortex motions in perfectly inviscid fluids encouraged the invention—throughout the latter half of the 19th century and especially in Great Britain—of models in which vortices in a structureless ether played the part otherwise assigned to atoms. In recent years the recognition that certain localized disturbances…

…the mean, an intense cyclonic vortex about the poles in the lower stratosphere. Over the North Pole this vortex has an embedded mean trough over northeastern North America and over northeastern Asia, whereas over the Pacific there is a weak anticyclonic vortex. The winter cyclonic vortex over the South Pole…

…to rotate is known as vorticity and is given by the following equation: ζ = ∂v/∂x – ∂u/∂y (5) where ζ is the relative vorticity with respect to Earth’s surface. The variables x and y are the coordinate axes for space and correspond to the measurements to the east and…

…of the advection of Earth’s vorticity are overwhelmed by the effects of advection of relative vorticity.

…chain of particles, called a vortex. As a result of the original motion, some particles were gradually ground into a spherical form, and the resulting intermediary space became filled with the surplus splinters or “grindings.” Ultimately, three main types of particles were formed: (1) the splinter materials, which form the…