Corpus ID: 117726452

Vortex ring generation during drop impact into a shallow pool

  title={Vortex ring generation during drop impact into a shallow pool},
  author={Andreas Wilkens and David Auerbach and GertJan van Heijst},
  journal={arXiv: Fluid Dynamics},
When a drop falls from a moderate height into a shallow fluid pool whose depth is of the order of the drop-radius two pairs of vortex rings are generated. The inner pair forms at the edge of the crater created by the impacting drop while the outer pair is laid off from the spreading wave. One ring of each of these pairs is short-lived while the other persists. Each of the rings has a measureable non-zero circulation (whose sign, however, is opposite to that of the well-known deep-water drop… Expand


The vortex ring velocity resulting from an impacting water drop
Experimental observations are reported on the evolution of a vortex ring for the first 70 ms after it is created by the impact of a dyed water drop upon a pool of clear water. The 2.6 mm diameterExpand
The instability of a vortex ring impinging on a free surface
Direct numerical simulation is used to study the development of a single laminar vortex ring as it impinges on a free surface directly from below. We consider the limiting case in which the FroudeExpand
The impact of a vortex ring on a wall
The flow induced by a vortex ring approaching a plane wall on a trajectory normal to the wall is investigated for an incompressible fluid which is otherwise stagnant. The detailed characteristics ofExpand
Numerical study of a vortex ring impacting a flat wall
We numerically study a vortex ring impacting a flat wall with an angle of incidence θ ≥ 0°) in three dimensions by using the lattice Boltzmann equation. The hydrodynamic behaviour of the ring–wallExpand
Head‐on collision of a large vortex ring with a free surface
The generation of free surface waves due to the head‐on collision of a vortex ring with the free surface is studied experimentally and numerically. The interaction process is investigated by lookingExpand
The interaction of spatially modulated vortex pairs with free surfaces
Spatially modulated vortex pairs were generated below a free surface by two counter-rotating flaps whose edges approximate a sinusoid. The surface interactions of the vertically approaching vortexExpand
Drop impact on a liquid–liquid interface
The effects of Reynolds number (Re) on the gravity-driven impact of a single drop onto a liquid–liquid interface were studied experimentally using the particle image velocimetry method. The liquidExpand
Stability of confined swirling flow with and without vortex breakdown
A numerical investigation of steady states, their stability, onset of oscillatory instability, and slightly supercritical unsteady regimes of an axisymmetric swirling flow of a NewtonianExpand
The optimal drop shape for vortices generated by drop impacts: the effect of surfactants on the drop surface
Subsurface vortices are frequently created when a falling drop strikes a flat water surface. Prior work has demonstrated that the shape of the drop at the point of impact is critical in determiningExpand
A sensitivity study of vortex breakdown onset to upstream boundary conditions
This paper theoretically investigates the influence of the upstream boundary conditions on the bifurcation structure leading to vortex breakdown. The axisymmetric flow of an inviscid fluid in a pipeExpand