Stationary bathtub vortices and a critical regime of liquid discharge

@article{Stepanyants2008StationaryBV,
  title={Stationary bathtub vortices and a critical regime of liquid discharge},
  author={Yury A. Stepanyants and Guan Heng Yeoh},
  journal={Journal of Fluid Mechanics},
  year={2008},
  volume={604},
  pages={77 - 98}
}
A modified Lundgren model is applied for the description of stationary bathtub vortices in a viscous liquid with a free surface. Laminar liquid flow through the circular bottom orifice is considered in the horizontally unbounded domain. The liquid is assumed to be undisturbed at infinity and its depth is taken to be constant. Three different drainage regimes are studied: (i) subcritical, where whirlpool dents are less than the fluid depth; (ii) critical, where the whirlpool tips touch the… 

Burgers–Rott vortices with surface tension

Abstract.A modified Lundgren’s model (the LABSRL model) accounting for the effect of surface tension is applied for the description of stationary bathtub vortices in a viscous liquid with a free

Study of stationary vortex with a free surface at the bottom of the orifice flow

ABSTRACT Theoretical investigations are conducted to study the structure of stationary vortex with a free surface at the bottom of the orifice flow. A modified Lundgren-like model has come up to

An analytical model for vortex at vertical intakes

In the present paper, free surface vortex formation at intakes is investigated analytically. By assuming a spiral form for vortex streamlines, continuity and momentum equations were integrated and

Free surface intake vortices: theoretical model and measurements

ABSTRACT Axially stretched free-surface vortices occur at low-head hydropower intakes under specific flow and geometric conditions. When they are sufficiently strong, they can harm performance or

Origin of the Bathtub Vortex and Its Formation Mechanism

The generation and subsequent development of the bathtub vortex appearing in a cylindrical vessel are numerically investigated in order to clarify its origin and the mechanism to determine the

Structure of a steady drain-hole vortex in a viscous fluid

We use direct numerical simulations to study a steady bathtub vortex in a cylindrical tank with a central drain-hole, a flat stress-free surface and velocity prescribed at the inlet. We find that the

Understanding turbulent free-surface vortex flows using a Taylor-Couette flow analogy

TLDR
Using Rayleigh’s stability criterion, it is analytically show that a wall bounded free-surface vortex can indeed become unstable due to a centrifugal driving force in a similar manner to the Taylor-Couette flow.

Study of air-core vortical flow structure induced by a plughole vortex

This paper describes a study of the generation of a plughole vortex and its consequences in a drainpipe during drainage of water from a stationary rectangular tank. The critical and minimum depths of

Scattering of surface shallow water waves on a draining bathtub vortex

In the linear approximation we study long wave scattering on an axially symmetric flow in a shallow water basin with a drain in the center. This classical problem can be considered as a model of wave

References

SHOWING 1-10 OF 41 REFERENCES

Burgers–Rott vortices with surface tension

Abstract.A modified Lundgren’s model (the LABSRL model) accounting for the effect of surface tension is applied for the description of stationary bathtub vortices in a viscous liquid with a free

The bath-plug vortex

Steady flow with constant circulation into a vertical drain is considered. The precise details of the outflow are simplified by assuming that the drain is equivalent to a distributed volume sink,

The bathtub vortex in a rotating container

We study the time-independent free-surface flow which forms when a fluid drains out of a container, a so-called bathtub vortex. We focus on the bathtub vortex in a rotating container and describe the

An impulsive bathtub vortex

The impulsive free-surface flow due to a point sink at the bottom of a container with rotating inviscid fluid is investigated analytically by a small-time expansion. Before the sink is turned on

Anatomy of a bathtub vortex.

TLDR
The fast down-flow is found to be confined to a narrow and rapidly rotating "drainpipe" from the free surface down to the drain hole, and at the tip of the needlelike surface depression, a bubble-forming instability at high rotation rates is observed.

Axisymmetric draining of a cylindrical tank with a free surface

The withdrawal of layered fluids from an open tank through a hole centred on the bottom is investigated numerically under the assumption of potential flow. A fully cubic-spline nonlinear axisymmetric

VORTEX FORMATION AT VERTICAL PIPE INTAKES

With the object of determining the similarity criterion, experimental studies on vortex formation at pipe intakes were carried out using two geometrically similar circular vortex tanks, circulation

Free‐Surface Air Core Vortex

A Rankine vortex model is used as the basis for an equation for critical submergence of intakes. The equation relates critical submergence to Froude number, circulation number, Reynolds number, and

A note on the bathtub vortex

Observations were made of the vortex motion which occurs when a liquid is draining from a vessel through a hole in its bottom. It was found that, for relatively quiescent initial conditions, the

A Study on the Free Surface Vortex in the Pipe System

During mid-loop operation of Nuclear Power Plant, to prevent the Decay Heat Removal System (DHRS) from failure due to air entrainment of free surface vortex in the piping system, a set of simulating