Vortex breakdown in a water-spout flow

Mixing in a vortex breakdown flow

Axisymmetric Vortex Breakdown in an Enclosed Cylinder Flow

The attraction of the confined swirling flow generated inside an enclosed cylinder by the constant rotation of one of its endwalls to a study of vortex breakdown is that the flow is defined by only four variables, these being the height H and radius R of the cylinder, the constant angular speed of rotation of the endwall f~ and the kinematic viscosity t~. These four variables are used to define...

Precessing vortex breakdown mode in an enclosed cylinder flow

The flow in a cylinder driven by the rotation of one endwall for height to radius ratios around three is examined. Previous experimental observations suggest that the first mode of instability is a precession of the central vortex core, whereas a recent linear stability analysis to general three-dimensional perturbations suggests a Hopf bifurcation to a rotating wave at lower rotation rates tha...

Axisymmetric vortex breakdown Part 1. Confined swirling flow

A comparison between the experimental visualization and numerical simulations of the occurrence of vortex breakdown in laminar swirling flows produced by a rotating endwall is presented. The experimental visualizations of Escudier (1984) were the first to detect the presence of multiple recirculation zones and the numerical model presented here, consisting of a numerical solution of the unstead...

Axisymmetric Vortex Breakdown in a PipeS

A recent theory of the nearly axisymmetric vortex breakdown in a pipe is presented. We study the motion of an axisymmetric and inviscid swirling ow in a pipe with certain boundary conditions that may reeect the physical situation. The theory is built of global analysis of solutions of the Squire-Long equation and linear stability analysis of these solutions. The theory uniies the major previous...