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Starting vortex

About: Starting vortex is a research topic. Over the lifetime, 4785 publications have been published within this topic receiving 100419 citations.


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Journal ArticleDOI
TL;DR: In this article, the three-dimensional vortex structure created by a dyed water drop impacting a pool of water is studied for a Weber number of 22-25 and a Froude number of 25-28.
Abstract: Observations are reported for the three‐dimensional vortex structure created by a dyed water drop impacting a pool of water. The structure and evolution of the vorticity is studied for a Weber number of 22–25 and a Froude number of 25–28. The drop and pool do not make first contact at the bottom of the drop but at latitudes away from the bottom pole of the drop. This traps a thin, curved, pancake‐shaped air bubble beneath the drop which rapidly contracts into a sphere. As the drop impacts the pool its impulse produces vorticity which rolls up into a primary vortex ring. As the vortex ring travels down through the pool, vortex filaments extend from the central axis of the vortex ring to form a ‘‘stalk.’’ This reaches from the primary ring to another ring of vorticity which has formed in the now reversing free surface impact crater. As the primary ring convects downward some vortex filaments undergo an azimuthal instability which grows until the filaments escape the trapped orbits of the primary vortex ring...

81 citations

Journal ArticleDOI
TL;DR: In this article, the authors studied the flow characteristics on and around an airfoil at moderate Reynolds number to understand the generation mechanism of tonal noise from a symmetrical airfoin NACA0018 in a uniform flow.

80 citations

Journal ArticleDOI
TL;DR: Vortex methods are competitive for simulating incompressible unsteady flows, because they have negligible dispersion error and good energy conservation as discussed by the authors, including particle redistribution, diffusion, relaxation (by projection), efficient solvers (fast multipole method, vortex-in-cell method, hybrid method) and parallel computer implementations.

80 citations

Journal ArticleDOI
TL;DR: In this article, the flow field around an asymmetric dielectric-barrier discharge (DBD) plasma actuator in quiescent air is studied using particle image velocimetry (PIV) and smoke-flow visualization.
Abstract: The flow field around an asymmetric dielectric-barrier-discharge (DBD) plasma actuator in quiescent air is studied using particle image velocimetry (PIV) and smoke-flow visualization. On initiation of DBD plasma a starting vortex is created, which rolls up to form a coherent structure. The starting vortex becomes self-similar when the maximum velocity induced by the DBD plasma actuator reaches a steady state. Here, the plasma jet momentum increases linearly with time, suggesting that the DBD plasma actuator entrains and accelerates the surrounding fluid with a constant force. The wall-parallel and wall-normal distances of the vortex core are observed to scale with as it travels at to the wall. The velocity of the starting vortex is found to scale with , while the circulation induced by the plasma actuator scales with .

79 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202336
202278
20217
20207
20196
201815