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In fluid dynamics, vortex stretching is the lengthening of vortices in three-dimensional fluid flow, associated with a corresponding increase of the component of vorticity in the stretching direction—due to the conservation of angular momentum. [1] Vortex stretching is associated with a particular term in the vorticity equation. For example ...
The term (ω ∙ ∇) u on the right-hand side describes the stretching or tilting of vorticity due to the flow velocity gradients. Note that (ω ∙ ∇) u is a vector quantity, as ω ∙ ∇ is a scalar differential operator, while ∇u is a nine-element tensor quantity. The term ω(∇ ∙ u) describes stretching of vorticity due to flow ...
A vortex tube is the surface in the continuum formed by all vortex lines passing through a given (reducible) closed curve in the continuum. The 'strength' of a vortex tube (also called vortex flux ) [ 10 ] is the integral of the vorticity across a cross-section of the tube, and is the same everywhere along the tube (because vorticity has zero ...
NEW ORLEANS (AP) — The vast majority of Americans are about to get an extended taste of frigid Siberian weather. Another polar vortex disruption will stretch Arctic air across the top of the globe, with expected frigid conditions in the nation's capital severe enough to force Donald Trump's second inauguration indoors on Monday.
When the polar vortex stretches it can either bring that cold air south to the United States or toward Asia, said Cohen, an expert in winter weather. Other times, when something called sudden stratospheric warming happens, the polar vortex moves away from the Arctic and comes south or even splits. That's not the case this time, Cohen said.
Temperatures are expected to plummet over the weekend, bringing life-threatening conditions to large stretches of the United States. The polar vortex will send temperatures below freezing for much ...
Temperatures could be 12 to 25 degrees (7 to 14 degrees Celsius) below normal as the polar vortex stretches down from the high Arctic. In Chicago on Saturday, temperatures hovered in the teens (minus 7-10 Celsius) and around zero in Minneapolis (minus 18 C), while dropping to 14 below (minus 25 C) in International Falls, Minnesota, on the ...
The stationary Burgers vortex arises when the three effects are in balance. The Burgers vortex, apart from serving as an illustration of the vortex stretching mechanism, may describe such flows as tornados, where the vorticity is provided by continuous convection-driven vortex stretching.