We study vortex lattice structures of a trapped Bose-Einstein condensate in a rotating lattice potential by numerically solving the time-dependent GrossPitaevskii equation. By rotating the lattice potential, we observe the transition from the Abrikosov vortex lattice to the pinned lattice. We investigate the transition of the vortex lattice structure by changing conditions such as angular veloc...

s (in alphabetical order) Michael Dallaston (Imperial College London) ”Interfacial Hele-Shaw flows that develop corner singularities” It is well known that the evolution of a receding free boundary in one-phase Hele-Shaw flow (such as an expanding air bubble surrounded by viscous fluid) is ill-posed and generically forms cusps. The interfacial velocity at the cusp points is unbounded. Imposing ...

Modern designs for straight-bladed vertical axis wind turbines (VAWTs)feature smaller individual footprints than conventional horizontal axis wind turbines (HAWTs), allowing closer spacing of turbines and potentially greater power extraction for the same wind farm footprint. However, the wakes of upstream turbines could persist far enough to affect the performance of closely-spaced downstream t...

In a triple-hole system comprising primary hole and two sister holes, when the holes are positioned slightly downstream of main under steady flow conditions, their jets generate an anti-counter-rotating vortex pair. Vortex interactions between increase effectiveness adiabatic film cooling. this study, series large-eddy simulations were conducted to understand how pulsations in affect cooling tr...

We report on the observation of magnetic vortex dynamics in response to rotating magnetic fields in submicron platelets. Unlike linear fields or spin polarized currents, which excite both vortex core polarization states, an in-plane rotating field can selectively excite one of the polarization states. We demonstrate by direct imaging with time-resolved scanning x-ray microscopy that the rotatin...

Direct numerical simulations are used to investigate the Open Von Kármán Swirling Flow, a new type of unsteady three-dimensional flow that is formed between two counter-rotating coaxial disks with an axial extraction enclosed by a cylinder chamber. Solution verification shows that monotonic convergence is achieved on three systematically refined grids for average pressure at the disk periphery ...

Aircraft wake is a pair of counter-rotating vortices generated behind the aircraft, which can greatly impact safety fast takeoff and landing aircraft limit improvement airport capacity. The current parameter retrieval methods cannot locate vortex's position estimate its strength level in real time. To deal with this issue, novel algorithm based on YOLOv5s deep learning network proposed. new est...

In this work, the behavior of charged micron-sized particles in DC glow discharge stratum at low pressure a crossed magnetic and electric field was experimentally studied. The experiment conducted vertically oriented gas-discharge glass tube. A homogeneous created using two-section Helmholtz coil. results showed that dust move opposite direction to ExB drift as induction increases. Once reaches...

Two types of vortex states have been much studied in superfluid He. The first is the vortex array in a rotating container. The second is the vortex tangle in turbulent flow. An experiment attempt to combine these two states by rotating a counterflow was attempted years ago. The data suggest the existence of different flow regimes separated by instabilities, but a theoretical interpretation is s...

Designing and manufacturing the multiple jets simulator and experimental investigation of the multiple jets in crossflow at low velocity ratios have been studied Together with design and build a low-speed wind tunnel. A specific rake is used to determine the flow field pressure and changes in static pressure measured by pressure taps in the near field of the jets. There are generally three regi...