Energy cascade and intermittency in helically decomposed Navier–Stokes equations
نویسندگان
چکیده
منابع مشابه
Intermittency exponent of the turbulent energy cascade.
We consider the turbulent energy dissipation from one-dimensional records in experiments using air and gaseous helium at cryogenic temperatures, and obtain the intermittency exponent via the two-point correlation function of the energy dissipation. The air data are obtained in a number of flows in a wind tunnel and the atmospheric boundary layer at a height of about 35 m above the ground. The h...
متن کاملIntermittency in the joint cascade of energy and helicity.
The statistics of the energy and helicity fluxes in isotropic turbulence are studied using high resolution direct numerical simulation. The scaling exponents of the energy flux agree with those of the transverse velocity structure functions through refined similarity hypothesis, consistent with Kraichnan's prediction. The helicity flux is even more intermittent than the energy flux. Consistent ...
متن کاملOn the intermittency exponent of the turbulent energy cascade
Jochen Cleve, Martin Greiner, Bruce R. Pearson, and Katepalli R. Sreenivasan International Centre for Theoretical Physics, Strada Costiera 11, 34014 Trieste, Italy; email: [email protected], [email protected] Institut für Theoretische Physik, Technische Universitt, D-01062 Dresden, Germany Corporate Technology, Information & Communications, Siemens AG, D-81730 München, Germany; email: mar...
متن کاملComment on "Intermittency exponent of the turbulent energy cascade".
It is argued that the method used by Cleve et al. [Phys. Rev. E 69, 066316 (2004)], to determine the intermittency exponent mu is biased at moderate Reynolds numbers R lambda. Thus, the claimed dependence of mu upon (R lambda) is questionable. Other determinations give a constant value for mu.
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We study the internal intermittency in the inverse energy cascade and in the condensation regime of two-dimensional turbulence, using physical and numerical experimental approaches. The analysis confirms that the velocity increments have nearly Gaussian distributions at all scales in the inverse cascade regime; it moreover shows that, in the condensation regime, the probability distribution fun...
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ژورنال
عنوان ژورنال: Fluid Dynamics Research
سال: 2018
ISSN: 0169-5983,1873-7005
DOI: 10.1088/1873-7005/aa839a