the manner of spray the fuel has an important effect on stability and convenient mixture of fuel and oxidizer. swirl injectors because of formation of uniform spray cone and proper distribution of the fuel have been used in many rocket engines at aerospace industries. formation and development of air core in the interior stream of swirl injectors and simulation of them is complicated. double ba...

Rotating vortices are easily pinned to any defects in excitable media. Moderate advective fields cannot remove the pinned vortices. We have found and tested experimentally a mechanism for unpinning a vortex. To unpin a vortex, we created additional waves close to its core. A vortex can be unpinned when a new created wave is pinned to the same obstacle and has a topological defect. This mechanis...

We report on the experimental observation of fluid flow caused by propagation of femtosecond filaments in dry air. We find that the ionization of the medium deposits a non-negligible amount of heat, which creates vortices in a semi-confined glass cylinder. We confirm the influence of thermal gradients on vortex formation by the use of a heated wire in a similar configuration.

A microscopic, quantum mechanical model for neutron vortices in the crust of a neutron star is presented. After a brief introduction to the Bogoliubov-de Gennes equations, which form the basis for our calculations, we present results for density distributions, vortex core sizes and vortex energies, both for an isolated neutron vortex and for the case when the vortex core overlaps with a cylindr...

In the topological superconductor with nematic superconductivity in $E_u$ representation, it is possible to have different types of vortices. One associated vorticity particle-hole space and corresponds Abrikosov vortex. Another type spin called We study interaction vortex derive free energy sample strain-induced vortices using Ginzburg-Landau approach for two-component superconducting order pa...

We show how a singly quantized vortex can exhibit energetically stable defect cores with different symmetries in an atomic spin-1 polar Bose-Einstein condensate, and how a stable topologically nontrivial Skyrmion texture of lower dimensionality can be confined inside the core. The core isotropy and the stability of the confined texture are sensitive to Zeeman level shifts. The observed structur...

We study the motion of a superfluid vortex in condensates having different background density profiles, ranging from parabolic to uniform. The resulting effective point-vortex model for generic power-law potential $\ensuremath{\propto}{r}^{k}$ can be experimentally realized with recent advances optical-trapping techniques. Our analysis encompasses both empty-core and filled-core vortices. In la...

In this work, we study the role of horizontal temperature differences on top and bottom, their combined effect, relation to vertical difference in development traditional or reversed funnel-shaped vortices a rotating cylinder inhomogeneously cooled heated at bottom. These thermal inhomogeneities upper lower levels are observed formation atmospheric vortices. Our numerical results show that if i...

We revisit the classical problem of self-similar, finite-time collapse three vortices. extend study to generalised two-dimensional Euler equations as well three-dimensional quasi-geostrophic equations. In both these situations, flow is fully controlled by a materially-conserved field vorticity (or potential vorticity) related streamfunction modified Poisson’s equation, in which standard Laplaci...

I analyze the interplay of gauge and global symmetries in the theory of topological defects. In a two-dimensional model in which both gauge symmetries and exact global symmetries are spontaneously broken, stable vortices may fail to exist even though magnetic flux is topologically conserved. Following Vachaspati and Achúcarro, I formulate the condition that must be satisfied by the pattern of s...