A preliminary examination was made of the formation and structure of the classical vortex ring. It is inferred from the experimental evidence that the configuration is not a true ring, but a layer of disperse fluid rolled about a circular axis. The stability of this pseudo-ring was found to ...
The work focuses on the problem of stability and viscous decay of single vortex rings. A tentative classification scheme is proposed for vortex rings which... M Dziedzic,HJ Leutheusser - 《Experiments in Fluids》 被引量: 29发表: 1996年 Whole-field measurements of unsteady separation in a vorte...
Compressible vortex rings (CVRs) are one fundamental supersonic flow structure, which is usually generated by a compressible starting jet from a nozzle. Changes in the nozzle geometry provide efficient passive flow control to modulate the structures of CVRs. In this paper, a shock-tube apparatus ...
The temporal development of the rolling-up process of vortex rings produced in water at a circular nozzle is investigated by flow visualization. The results are compared with similarity laws for the rolling-up of vortex sheets in plane flow. The unsteady flow field in the nozzle-exit plane is...
Local uniqueness of vortices for 2D steady Euler flow in a bounded domain Local uniquenessNonlinear stabilityVORTEX PATCH PROBLEMNONLINEAR STABILITYEXISTENCERINGSSHAPEWe study the 2D Euler equation in a bounded simply -connected domain,... D Cao,W Yu,C Zou - 《Journal of Functional Analysis》 被引...
The formation of a vortex ring was simulated by injecting a quantity of a fluid through a tube centrally located near the free surface. Initially, the fluid in the tank was stably thermally stratified, with a low density in the upper half and higher density in the lower half. Buoyancy ...
(1995) employed both direct numerical simulations and a localized stability analysis, which was applied to an isolated vortex ring by Widnall and Sullivan (1973), in their investigation into the azimuthal instabilities of the secondary ring. From this, they were able to show that the evolution ...
An experiment is described which shows that a vortex ring traveling toward a wall situated normal to its axis may undergo momentary inversions of its forward velocity. A qualitative analysis of the physics involved is given. 关键词: Experimental/ boundary layers vortices/ vortex rings wall water ve...
The structure and stability of vortex rings. J. Fluid Mech. 1972, 51, 15–32. [Google Scholar] [CrossRef] Shariff, K.; Leonard, A. Vortex rings. Annu. Rev. Fluid Mech. 1992, 24, 235. [Google Scholar] [CrossRef] Sullivan, I.S.; Niemela, J.J.; Hershberger, R.E.; Bolster, ...
The dynamics of vortex rings: Leapfrogging, choreographies and the stability problem We consider the problem of motion of axisymmetric vortex rings in an ideal incompressible fluid. Using the topological approach, we present a method for co... AV Borisov,AA Kilin,IS Mamaev - 《Regular & Chaotic...