The motion of assemblies of point vortices in a periodic parallelogram can be described by the complex position zj(t) whose time derivative is given by the sum of the complex velocities induced by other vortices and the solid rotation centered at zj . A numerical simulation up to 100 vortices in a square periodic box is performed with various initial conditions, including single and double rows...

I discuss in these lectures vortex-like classical solutions to the equations of motion of gauge theories with spontaneous symmetry breaking. Starting from the Nielsen-Olesen ansatz for the Abelian Higgs model, extensions to the case in which gauge dynamics is governed by Yang-Mills and Chern-Simons actions are presented. The case of semilocal vortices and also the coupling to axions is analyzed...

The direct numerical simulation database from Shin et al. ( J. Fluid Mech. , vol. 823, 2017, pp. 1–25) is used to study three-dimensional vortical and very-large-scale coherent structures in a turbulent round jet at Reynolds number of $7300$ . In particular, horseshoe vortices their role the formation near intermediate fields are assessed. swirling strength criterion together with conditional a...

The evolution of co-rotating streamwise vortices in a canonical flat plate turbulent boundary layer ~thickness of the boundary layer d0.99525 mm) is studied. The vortices are produced by an array of inclined jets ~diameter D514 mm) with the same orientation ~skew angle b and pitch angle a of 45°!. The focus of the investigation is on the immediate vicinity of the jet exit and downstream locatio...

The vortex ring state (VRS) of a rotor is associated with the development trailed system in powered descending flight, where topology wake changes from its usual helical form into toroidal form. In VRS, envelops entire rotor, and it sheds reforms an unsteady manner. previous attempts to understand basic phenomenology focus was on role vortices transition VRS: computational experimental work uti...

Abstract   Due to restrictions on the choice of relaxation time in single relaxation time (SRT) models, simulation of flows is generally limited base on this method. In this paper, the SRT lattice Boltzmann equation was used to simulate lid driven cavity flow at different Reynolds numbers (100-5000) and three aspect ratios, K=1, 1.5 and 4. The point which is vital in convergence of this scheme ...

Dynamics of two-sign point vortices in two-dimensional circular boundary is examined by numerical simulations with MDGRAPE-2. The vortex system is characterized by the inverse temperature beta as determined from the density of states of the microcanonical ensemble of numerically generated 10(7) states. The massive simulation shows that different configurations appear in the time-asymptotic stat...

An intensive experimental investigation was conducted to study the effect of vertical tail, single and twin (with different cant angles) on the flow field and the corresponding aerodynamic forces and moments of a model of a fighter A/C. Aerodynamic forces under different flight conditions and different vertical tail settings were measured in a supersonic wind tunnel. Furthermore, effects of ver...

A previously unknown instability creates space-filling lattices of 3D vortices in linearly stable, rotating, stratified shear flows. The instability starts from an easily excited critical layer. The layer intensifies by drawing energy from the background shear and rolls up into vortices that excite new critical layers and vortices. The vortices self-similarly replicate to create lattices of tur...

We present a theoretical study on the influence of flexoelectric coupling spatial distribution and temperature behavior spontaneous polarization for several types stable domain structure in thin ferroelectric films, such as stripe domains vortices. Finite-element modeling (FEM) ${\mathrm{BaTiO}}_{3}$ films analytical calculations within Landau-Ginzburg-Devonshire approach reveals that an out-of...