نتایج جستجو برای: counter rotating vortex pair
تعداد نتایج: 216857 فیلتر نتایج به سال:
We investigate the nonlinear evolution of pairs three-dimensional, equal-sized and opposite-signed vortices at finite Froude Rossby numbers. The two may be offset in vertical direction. initial conditions stem from relative equilibria obtained numerically quasi-geostrophic regime, for vanishing first address linear stability vortices, show that all offsets, are sensitive to an instability when ...
Nose cones, turbine blades and bearings have rotating components and represent very practical geometries for which the modal behavior of vortex structures is not completely understood. These three rather different physical cases are being studied. A common theme of competition between modes and vortex types, whether counter-rotating or co-rotating, emerges. The objective of ongoing work is to o...
The existence of a local curve corotating and counter-rotating vortex pairs was proven by Hmidi Mateu in via desingularization pair point vortices. In this paper, we construct global continuation these curves. That is, consider solutions which are more than mere perturbation trivial solution. Indeed, while the analysis relies on study linear equation at solution, requires deeper understanding t...
Abstract The impact of two tubercle leading-edge (TLE) modifications on the turbulent wake a reference marine rudder at Reynolds number 2.26 × 10 6 was analysed numerically using Detached Eddy Simulations (DES). This paper studies counter-rotating vortex pair formation around TLE and their structures behind to find out if interaction can accelerate tip dissipation. According results, tubercles ...
We report three-dimensional direct numerical simulations of the turbulent flow between counter-rotating concentric cylinders with a radius ratio 0.5. The innerand outer-cylinder Reynolds numbers have the same magnitude, which ranges from 500 to 4000 in the simulations. We show that with the increase of Reynolds number, the prevailing structures in the flow are azimuthal vortices with scales muc...
Wind turbine wake redirection drawn by a yaw control has been proposed as strategy to improve the performance of wind farms. However, characteristics and development curled structure deformed action rotor are not well understood. In present study, behind imparted with various angles subjected uniform inflow was investigated using large-eddy simulation. The NREL 5MW reference modeled an actuator...
Three devices for treating contaminated water using a cavitating vortex have been developed and tested. The first device uses stationary twin volute casings to generate cavitating vortices. Observation of the collisions among the opposing counter-rotating vortices revealed that their end portions whirl, that the vortices never collide head-on, and that they eventually separate into several smal...
We review the topic of quantized vortices in multicomponent Bose-Einstein condensates of dilute atomic gases, with an emphasis on that in two-component condensates. First, we review the fundamental structure, stability and dynamics of a single vortex state in a slowly rotating two-component condensates. To understand recent experimental results, we use the coupled Gross-Pitaevskii equations and...
Results of a numerical simulation are presented to determine the feasibility of estimating the location and strength of a wake vortex from imperfect in-situ measurements. These estimates could be used to provide information to a pilot on how to avoid a hazardous wake vortex encounter. An iterative algorithm based on the method of secants was used to solve the four simultaneous equations describ...
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