Energy cascades in active-grid-generated turbulent flows
نویسندگان
چکیده
منابع مشابه
Sur Les Cascades D' Energie En Ecoulements Turbulents Cascade of Energy in Turbulent Flows
A starting point for the conventional theory of turbulence (A. N. Kolmogorov (1941a,b, 1942)) is the notion that, on average, kinetic energy is transferred from low wave number modes to high wave number modes (L. Onsager (1945)). Such a transfer of energy occurs in a spectral range beyond that of injection of energy, and it underlies the so-called cascade of energy, a fundamental mechanism used...
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A. Cimarelli1,2,†, E. De Angelis1,3, J. Jiménez4 and C. M. Casciola5 1DIN, Università di Bologna, 47121 Forlì, Italy 2DISMI, Università di Modena e Reggio Emilia, 42122 Reggio Emilia, Italy 3School of Engineering, Cardiff University, Queen’s Buildings, Cardiff CF24 3AA, UK 4School of Aeronautics, Universidad Politécnica de Madrid, 28040 Madrid, Spain 5DIMA, Università di Roma La Sapienza, 00185...
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Turbulent dispersion of passive scalar quantities has been extensively studied in wind tunnel settings, where the flow is carefully conditioned using flow straighteners and grids. Much less is known about turbulent dispersion in the "unconditioned" flows generated by fans that are ubiquitous in indoor environments, despite the importance of these flows to pathogen and contaminant transport. Her...
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متن کاملTurbulent cascades
Turbulent cascades at high Reynolds numbers are explained briefly in terms of multipliers and multiplier distributions. Two properties of the multipliers ensure the existence of power laws for locally averaged energy dissipation rate: (a) the existence of a multiplier probability density function that is independent of the level of the cascade, and (b) the statistical independence of multiplier...
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ژورنال
عنوان ژورنال: Physical Review Fluids
سال: 2019
ISSN: 2469-990X
DOI: 10.1103/physrevfluids.4.104601