Geometry of enstrophy and dissipation, grid resolution effects and proximity issues in turbulence
نویسندگان
چکیده
منابع مشابه
Geometry of enstrophy and dissipation, grid resolution effects and proximity issues in turbulence
We perform a multi-scale non-local geometrical analysis of the structures extracted from the enstrophy and kinetic energy dissipation-rate, instantaneous fields of a numerical database of incompressible homogeneous isotropic turbulence decaying in time obtained by DNS in a periodic box. Three different resolutions are considered: 256, 512 and 1024 grid points, with kmaxη̄ approximately 1, 2 and ...
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Existing experimental and numerical data suggest that the turbulence energy dissipation and enstrophy i.e., the square of vorticity possess different scaling properties, while available theory suggests that there should be no differences at sufficiently high Reynolds numbers. We have performed a series of direct numerical simulations with up to 20483 grid points where advanced computational pow...
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Insight into the problem of two-dimensional turbulence can be obtained by an analogy with a heat conduction network. It allows the identification of an entropy function associated with the enstrophy dissipation and that fluctuates around a positive (mean) value. While the corresponding enstrophy network is highly nonlocal, the direction of the enstrophy current follows from the Second Law of Th...
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Shiyi Chen,1,2 Katepalli R. Sreenivasan,3 and Mark Nelkin4 1IBM Research Division, T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 2Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 3Mason Laboratory, Yale University, New Haven, Connecticut 06520-8286 4Physics Department, New York University, New York...
متن کاملEnergy and enstrophy dissipation in steady state 2-d turbulence
where U is the root-mean-square velocity, kf is a wavenumber (inverse length scale) related with the forcing function, and Re = U/νkf . The positive coefficients C1 and C2 are uniform in the the kinematic viscosity ν, the amplitude of the driving force, and the system size. We compare these results with previously obtained bounds for body forces involving only a single length scale, or for velo...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2009
ISSN: 0022-1120,1469-7645
DOI: 10.1017/s002211200800476x