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Observation of vortices and vortex stripes in a dipolar condensate Open
Quantized vortices are a prototypical feature of superfluidity that have been observed in multiple quantum gas experiments. But the occurrence of vortices in dipolar quantum gases—a class of ultracold gases characterized by long-range anis…
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Onsager vortex formation in Bose-Einstein condensates in two-dimensional power-law traps Open
We study computationally dynamics of quantized vortices in two-dimensional superfluid Bose-Einstein condensates confined in highly oblate power-law traps. We have found that the formation of large-scale Onsager vortex clusters prevalent in…
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Vortex Thermometry for Turbulent Two-Dimensional Fluids Open
We introduce a new method of statistical analysis to characterize the dynamics of turbulent fluids in two dimensions. We establish that, in equilibrium, the vortex distributions can be uniquely connected to the temperature of the vortex ga…
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Anisotropy of turbulence at the core of the tip and hub vortices shed by a marine propeller Open
Large-eddy simulation on a grid consisting of 5 billion points was utilized to study the properties of turbulence at the core of the tip and hub vortices shed by a marine propeller across working conditions. Turbulence at the core of the t…
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Multidimensional Josephson vortices in spin-orbit-coupled Bose-Einstein condensates: Snake instability and decay through vortex dipoles Open
We analyze the dynamics of Josephson vortex states in two-component\nBose-Einstein condensates with Rashba-Dresselhaus spin-orbit coupling by using\nthe Gross-Pitaevskii equation. In 1D, both in homogeneous and harmonically\ntrapped system…
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Coupling of vortex breakdown and stability in a swirling flow Open
Experiments and simulations are combined to study flows in a T-mixer with offset inlets, whose stability is coupled to the vortex breakdown structure in the system. This leads to an unexpected flow regime in which increasing the flow rate …
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Numerical Study of Vortex Flow in a Classifier with Coaxial Tubes Open
Centrifugal air classifiers are one of the most used separation devices in particle technology. The study aims to obtain a detailed description of the bulk material classification mechanism in the developed centrifugal classifier. The clas…
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Local linear stability analysis of cyclone separators Open
Local linear stability analysis is applied to the flow inside a cyclone separator to investigate the unsteady precession of the vortex core. The results of the stability analysis are compared with experimental measurements of the vortex os…
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Topographic Stabilization of Ocean Rings Open
Coherent large‐scale vortices in the open ocean can retain their structure and properties for periods as long as several years. However, the patterns of potential vorticity in such vortices suggest that they are baroclinically unstable and…
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Investigation of the structures in the unstable rotating-cone boundary layer Open
This work reports on the unstable region and the transition process of the boundary-layer flow induced by a rotating cone with a half apex angle of 60 degrees using the probability density function (PDF) contour map of the azimuthal veloci…
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Jovian Vortices and Jets Open
We explore the theory of isolated vortices in strongly sheared, deep zonal flows and the stability of these banded jets, as occur in Jupiter’s atmosphere This is done using the standard 2-layer quasigeostrophic model with the lower layer d…
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Stabilization of Isolated Vortices in a Rotating Stratified Fluid Open
The key element of Geophysical Fluid Dynamics—reorganization of potential vorticity (PV) by nonlinear processes—is studied numerically for isolated vortices in a uniform environment. Many theoretical studies and laboratory experiments sugg…
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On the stability of continuously stratified quasi-geostrophic hetons Open
In this paper we examine the stability of quasi-geostrophic hetons in a stably, continuously stratified fluid. To this purpose we first determinate numerically equilibrium states. Equilibrium hetons consist of two vortices of equal and opp…
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Defining Lagrangian coherent vortices from their trajectories Open
We study the transport properties of mesoscale eddies (i.e., vortices of 100–200 km in diameter) over a finite time duration. While these oceanic structures are well-known to stir and mix surrounding water, they can also carry and transpor…
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Collision of Almost Parallel Vortex Filaments Open
We investigate the occurrence of collisions in the evolution of vortex filaments through a system introduced by Klein, Majda, and Damodaran and Zakharov . We first establish rigorously the existence of a pair of almost parallel vortex fila…
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Oscillations of Leading-Edge Vortex Breakdown Locations over a Delta Wing Open
This paper presents an experimental investigation of the oscillations of the leading-edge vortex breakdown locations over a slender delta wing with a 75 deg sweep angle. Here, a new mechanism is proposed, the vortex–secondary-flow interact…
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Adiabatic behavior of an elliptical vortex in a time-dependent external strain flow Open
The adiabatic behavior of two-dimensional (2D) fluid vortices subject to slowly varying, time-dependent external strain flows is studied theoretically, and experimentally using magnetized non-neutral electron plasmas. Here the E × B drift …
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Transitions between systems of satellite vortices in a rotating fluid Open
We investigate experimentally the transitions between systems of two and three satellite vortices found within a shallow layer of water above a rotating disk at the bottom of an open stationary cylindrical tank. We found that these systems…
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Spatio-temporal dynamics of superstructures and vortices in turbulent Rayleigh–Bénard convection Open
Understanding turbulent thermal convection is essential for modeling many natural phenomena. This study investigates the spatiotemporal dynamics of the vortical structures in the mid-plane of turbulent Rayleigh–Bénard convection in SF6 via…
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Mathematical Modeling of Vortex Interaction Using a Three-Layer Quasigeostrophic Model. Part 1: Point-Vortex Approach Open
The theory of point vortices is used to explain the interaction of a surface vortex with subsurface vortices in the framework of a three-layer quasigeostrophic model. Theory and numerical experiments are used to calculate the interaction b…
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Determining the vortex tilt relative to a superconductor surface Open
Here, it is of interest to determine the exit angle of a vortex from a superconductor surface, since this affects the intervortex interactions and their consequences. Two ways to determine this angle are to image the vortex magnetic fields…
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From a vortex gas to a vortex crystal in instability-driven two-dimensional turbulence Open
We study structure formation in two-dimensional turbulence driven by an external force, interpolating between linear instability forcing and random stirring, subject to nonlinear damping. Using extensive direct numerical simulations, we un…
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Beach vortices near circular topography Open
Finite-area monopolar vortices which propagate around topography without change in shape are computed for circular seamounts and wells including the limiting cases of each: islands and infinitely deep wells. The time-dependent behaviour of…
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Processes of Precession and Nutation in Swirling Interacting Gas Jets Open
The results of experimental studies of the oscillations of the velocity of a free isothermal swirling jet with a precessing vortex core are presented. They showed that in the initial section where there is a developed zone of reverse curre…
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Vortex with fourfold defect lines in a simple model of self-propelled particles Open
We studied formation of vortex with four-fold symmetry in a minimal model of self-propelled particles, confined inside a squared box, using computer simulations and also theoretical analysis. In addition to the vortex pattern, we observed …
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Vortex impingement onto an axisymmetric obstacle – subcritical bifurcation to vortex breakdown Open
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Three-dimensional Quasi-geostrophic Staggered Vortex Arrays Open
We determine and characterise relative equilibria for arrays of point vortices in a three-dimensional quasi-geostrophic flow. The vortices are equally spaced along two horizontal rings whose centre lies on the same vertical axis. An additi…
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Computational Investigation of the Effect of Air Injection into the Fluid Flow with Precessing Vortex Core Open
The paper is devoted to the numerical study of the effect of air injection into the hydrodynamic vortex chamber at the flow characteristics with precessing vortex core.The calculation results are in good agreement with the experimental dat…
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Experimental speed study of twirled gas pipe with precessing vortex nuclei Open
The results of an experimental study of a strongly wound free isothermal jet with a precessing vortex core are presented. It was found that the distribution of radial and tangential velocity components while moving away from the cut of the…
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On the linear response theory of vortex meandering and its statistical verification in experiments Open
Meandering designates the main manifestation of unsteady vortex dynamics observed in experiments. This study has the twofold objective to (i) develop a theoretical model describing vortex meandering and (ii) conduct a quantitative and obje…