Vortex shedding effects in grid-generated turbulence
نویسندگان
چکیده
منابع مشابه
Kelvin-wave turbulence generated by vortex reconnections
Reconnections of quantum vortex filaments create sharp bends which degenerate into propagating Kelvin waves. These waves cascade their energy down-scale and their waveaction up-scale via weakly nonlinear interactions, and this is the main mechanism of turbulence at the scales less than the inter-vortex distance. In case of an idealised forcing concentrated around a single scale k0, the turbulen...
متن کاملQuantum Turbulence Generated by Grid Motion in Superfluid He
The mechanism by which the quantized vortex tangle in a turbulent superfluid system decays remains little understood [1]. Research into the subject suggests that Kelvin waves play an integral part in the dissipation process [2]. To generate quantum turbulence, a grid is dragged through 4 He which has condensed into the superfluid state. Oscillations in the motion of this grid remain a problem, ...
متن کاملFigure Captions Grid-generated Turbulence with and without Rotation
Fig. 1. Omnidirectional energy spectrum E(k) versus wavenumber k, computed from Eqs. (9)-(11), for the case A = 0:7, = 1, varying the rotation rate = 0; 10; 100. There is a smooth transition from the Komogorov`? 5=3' case = 0 to a spectrum = 100 that approaches a ` ? 2' form. Spontaneous breaking of reeexional symmetry in real quasi-two-dimensional turbulence: stochastic traveling waves and hel...
متن کاملVortex Dynamics in Turbulence
We survey attempts to construct vortex models of the inertial-range and fine-scale range of high Reynolds number turbulence. An emphasis is placed on models capable of quantitative predictions or postdictions. “I have no satisfaction in formulas unless I feel their numerical magnitude.” —Lord Kelvin
متن کاملEnergy spectrum of grid-generated He II turbulence.
A grid of bars towed through a sample of He II produces both superfluid turbulence and classical hydrodynamic turbulence. The two velocity fields-in the normal fluid and in the superfluid-have been observed to have the same energy spectral density over a large range of scales. Here, we introduce a characteristic scale l(q)=2 pi(epsilon/kappa(3))(-1/4), where epsilon is the rate of turbulent ene...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Fluids
سال: 2016
ISSN: 2469-990X
DOI: 10.1103/physrevfluids.1.044402