Critical fluctuation of wind reversals in convective turbulence
نویسندگان
چکیده
منابع مشابه
Critical fluctuation of wind reversals in convective turbulence.
The irregular reversals of wind direction in convective turbulence are found to have fluctuating intervals that can be related, under certain circumstances, to critical behavior. In particular, by focusing on its temporal evolution, the net magnetization of a two-dimensional Ising lattice of finite size is observed to fluctuate in the same way. Detrended fluctuation analysis of the wind reversa...
متن کاملMean wind in convective turbulence of mercury.
The large-scale circulation, often called "wind," in the confined thermal turbulence of mercury is studied experimentally. The instantaneous velocity profile at 128 points is directly measured using ultrasonic velocimetry. The periodic velocity oscillation is observed in the case of the aspect-ratio Gamma = 1,2 but not in Gamma = 0.5. Its peak frequency is scaled by f(c) proportional Ra(gamma(c...
متن کاملSolar flares and thermal wind reversals: critical metastable states
Two data sets of metastable states duration time: one obtained in a laboratory thermal convection experiment and another in the satellite’s Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI: 2002–2003 yy) observations, are compared in order to extract an information about a general (common) statistical mechanism in the onset of the metastable states. Simple probability distributions ...
متن کاملConditional averages in convective turbulence
Two exact results are presented for the thermal dissipation in a Rayleigh-BCnard geometry. The first result expresses the conditional dissipation at each value of 0 within the entire volume of the system in terms of the thermal flux and the PDF for 19. The second gives the conditional dissipation in a region of the cell in terms of the conditional flux into the region. These results are used to...
متن کاملFlow reversals in thermally driven turbulence.
We analyze the reversals of the large-scale flow in Rayleigh-Bénard convection both through particle image velocimetry flow visualization and direct numerical simulations of the underlying Boussinesq equations in a (quasi-) two-dimensional, rectangular geometry of aspect ratio 1. For medium Prandtl number there is a diagonal large-scale convection roll and two smaller secondary rolls in the two...
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 E
سال: 2005
ISSN: 1539-3755,1550-2376
DOI: 10.1103/physreve.72.066308