We review some ideas about the physics of small-scale turbulent statistics, focusing on the scaling of anisotropic fluctuations. We present results from direct numerical simulations of three-dimensional homogeneous, anisotropically forced, turbulent systems: the Rayleigh–B enard system, the random-Kolmogorovow, and a third with constant anisotropic energy spectrum at low wave numbers. A comparison of the anisotropic scaling properties displays good similarity among these very di erent flows. Our ndings support the conclusion that scaling exponents of anisotropic flucctuations are universal, i.e., independent of the forcing mechanism sustaining turbulence.
Universality of anisotropic turbulence
TRIPICCIONE, Raffaele
2004
Abstract
We review some ideas about the physics of small-scale turbulent statistics, focusing on the scaling of anisotropic fluctuations. We present results from direct numerical simulations of three-dimensional homogeneous, anisotropically forced, turbulent systems: the Rayleigh–B enard system, the random-Kolmogorovow, and a third with constant anisotropic energy spectrum at low wave numbers. A comparison of the anisotropic scaling properties displays good similarity among these very di erent flows. Our ndings support the conclusion that scaling exponents of anisotropic flucctuations are universal, i.e., independent of the forcing mechanism sustaining turbulence.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.