منابع مشابه
Cascades in helical turbulence.
We suggest the existence of a characteristic inner scale xi for helicity dissipation in a regime of hydrodynamic fully developed turbulence and estimate it on dimensional grounds. This scale is always larger than the Kolmogorov scale eta and their ratio eta/xi vanishes in the high Reynolds number limit, so the flow will always be helicity free in the small scales. These ideas are illustrated in...
متن کاملCascades and dissipation ratio in rotating magnetohydrodynamic turbulence at low magnetic Prandtl number.
A phenomenology of isotropic magnetohydrodynamic (MHD) turbulence subject to both rotation and applied magnetic field is presented. It is assumed that the triple correlation decay time is the shortest between the eddy turn-over time and the ones associated to the rotating frequency and the Alfvén wave period. For Pm=1 it leads to four kinds of piecewise spectra, depending on four parameters: in...
متن کاملUnsteady turbulence cascades.
We have run a total of 311 direct numerical simulations (DNSs) of decaying three-dimensional Navier-Stokes turbulence in a periodic box with values of the Taylor length-based Reynolds number up to about 300 and an energy spectrum with a wide wave-number range of close to -5/3 power-law dependence at the higher Reynolds numbers. On the basis of these runs, we have found a critical time when (i) ...
متن کاملKinetic helicity decay in linearly forced turbulence
1 NORDITA, AlbaNova University Center, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden 2 Department of Astronomy, AlbaNova University Center, Stockholm University, SE 10691 Stockholm, Sweden 3 Space Research Institute of the Russian Academy of Sciences Profsoyuznaya 84/32, Moscow 117997, Russia 4 Moscow Institute of Physics and Technology, State University, Institutsky lane 9, Dolgoprudny 141...
متن کاملRole of cross-helicity in magnetohydrodynamic turbulence.
Strong incompressible three-dimensional magnetohydrodynamic turbulence is investigated by means of high-resolution direct numerical simulations. The simulations show that the configuration space is characterized by regions of positive and negative cross-helicity, corresponding to highly aligned or antialigned velocity and magnetic field fluctuations, even when the average cross-helicity is zero...
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ژورنال
عنوان ژورنال: Physical Review E
سال: 2009
ISSN: 1539-3755,1550-2376
DOI: 10.1103/physreve.79.026304