منابع مشابه
Steady Axisymmetric Vortex Flows with Swirl and Shear
A general procedure is presented for computing axisymmetric swirling vortices which are steady with respect to an inviscid flow that is either uniform at infinity or includes shear. We consider cases both with and without a spherical obstacle. Choices of numerical parameters are given which yield vortex rings with swirl, attached vortices with swirl analogous to spherical vortices found by Moff...
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Flow watermarks are active traffic analysis techniques that help establish a causal connection between two network flows by content-independent manipulations, e.g., altering packet timings. Watermarks provide a much more scalable approach for flow correlation than passive traffic analysis. Previous designs of scalable watermarks, however, were subject to multi-flow attacks. They also introduced...
متن کاملOn vortex stretching and the global regularity of Euler flows I. Axisymmetric flow without swirl
The question of vortex growth in Euler flows leads naturally to the emergence of paired vortex structure and the “geometric” stretching of vortex lines. In the present paper, the first of two papers devoted to this question, we examine bounds on the growth of vorticity in axisymmetric flow without swirl. We show that the known bound on vorticity in this case, exponential in time, can be improve...
متن کاملEroding dipoles and vorticity growth for Euler flows in R3: axisymmetric flow without swirl
A review of analyses based upon anti-parallel vortex structures suggests that structurally stable dipoles with eroding circulation may offer a path to the study of vorticity growth in solutions of Euler’s equations in R3. We examine here the possible formation of such a structure in axisymmetric flow without swirl, leading to maximal growth of vorticity as t4/3. Our study suggests that the opti...
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The conditions in which meridional recirculations appear in swirling flows above a fixed wall are analysed. In the classical Bodewädt problem, where the swirl tends towards an asymptotic value away from the wall, the well-known "tea-cup effect" drives a flow away from the plate at the centre of the vortex. Simple dimensional arguments applied to a single vortex show that if the intensity of the...
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ژورنال
عنوان ژورنال: Combustion and Flame
سال: 1986
ISSN: 0010-2180
DOI: 10.1016/0010-2180(86)90133-1