Journal ArticleDOI
A vortex in an infinite viscous fluid
TLDR
In this paper, a solution for a viscous vortex in an infinite liquid is given, where similarity arguments lead to a reduction of the equations of motion to a set of ordinary differential equations.Abstract:
A solution is given for a viscous vortex in an infinite liquid. Similarity arguments lead to a reduction of the equations of motion to a set of ordinary differential equations. These are integrated numerically. A uniform feature is the constant circulation K outside the vortex core, which is also a viscous boundary layer. The circulation decreases monotonically towards the axis. The axial velocity profiles and the radial velocity profiles have several characteristic shapes, depending on the value of the non-dimensional momentum transfer M. The solution has a singular point on the axis of the vortex. The radius of the core increases linearly with distance along the axis from the singularity, and, at a given distance, is proportional to the coefficient of viscosity and inversely proportional to K.Finally, a discussion is given to indicate that intense vortices above a plate, like the confined experimental vortex, or above the ground, like the atmospheric tornado and dust whirl, will not resemble the theoretical vortex except, possibly, far above the plate.read more
Citations
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Journal ArticleDOI
A sufficient condition for the instability of columnar vortices
TL;DR: In this paper, the inviscid instability of columnar vortex flows in unbounded domains to three-dimensional perturbations is considered and a sufficient condition for columnar vortices is formulated.
Journal ArticleDOI
A solution for three-dimensional vortex flows with strong circulation
TL;DR: In this paper, the Navier-Stokes equations for a viscous, incompressible fluid are considered for a steady, axisymmetric flow composed of a strong rotation combined with radial sink flow which exhausts axially inside a finite radius.
Journal ArticleDOI
The structure of concentrated vortex cores
TL;DR: A review of recent work on the structure of vortex cores is given in this paper, with a discussion of the equations of motion and appropriate boundary conditions, and a description in general terms of the vigorous but highly responsive character of the flow, of the effects of compressibility and turbulence and of the phenomenon of energy separation.
Journal ArticleDOI
Collapse, symmetry breaking, and hysteresis in swirling flows
Vladimir Shtern,Fazle Hussain +1 more
TL;DR: In this paper, the authors reviewed striking features of swirling flows and the mechanisms involved with the help of conical similarity solutions of the Navier-Stokes equations and showed that the strong accumulation of axial and angular momenta, observed in tornadoes and flows over delta wings, corresponds to collapse.
Journal ArticleDOI
Reynolds-stress measurements in a turbulent trailing vortex
TL;DR: In this article, a turbulent line vortex was measured in zero pressure gradient with axisymmetric jets or wakes added coaxially to the vortex while the total circulation was held constant.
References
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Journal ArticleDOI
Vortex motion in a viscous fluid
TL;DR: In this article, a discussion is given of a three-dimensional vortex in a viscous fluid and a theory is outlined that leads to a reduction of the steady-state Navier-Stokes equations of an incompressible fluid to three ordinary, nonlinear, differential equations.
Journal ArticleDOI
Recorded pressure distribution in the outer portion of a tornado vortex
William Lewis,Porter J. Perkins +1 more
TL;DR: In this article, records from nine barographs located in a small area close to the path of a tornado were used to determine the pressure profile in the range from 720 to 2,300 feet.