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Coherent structures and extreme events in rotating multiphase turbulent flows
Luca Biferale, Fabio Bonaccorso, Irene M. Mazzitelli +5
By using direct numerical simulations (DNS) at unprecedented resolution we study turbulence under rotation in the presence of simultaneous direct and inverse cascades. The accumula…
Preferential sampling of helicity by isotropic helicoids
Kristian Gustavsson, Luca Biferale
We present a theoretical and numerical study on the motion of isotropic helicoids in complex flows. These are particles whose motion is invariant under rotations but not under mirr…
Extended self-similarity in moment-generating-functions in wall-bounded turbulence at high Reynolds number
Xiang I. A. Yang, Charles Meneveau, Ivan Marusic +1
In wall-bounded turbulence, the moment generating functions (MGFs) of the streamwise velocity fluctuations develop power-law scaling as a function of th…
Effects of magnetic and kinetic helicities on the growth of magnetic fields in laminar and turbulent flows by helical-Fourier decomposition
Moritz Linkmann, Ganapati Sahoo, Mairi McKay +2
We present a numerical and analytical study of incompressible homogeneous conducting fluids using a helical Fourier representation. We analytically study both small- and large-scal…
Chaotic and regular instantons in helical shell models of turbulence
Massimo De Pietro, Alexei A. Mailybaev, Luca Biferale
Shell models of turbulence have a finite-time blowup in the inviscid limit, i.e., the enstrophy diverges while the single-shell velocities stay finite. The signature of this blowup…
Inertial-particle accelerations in turbulence: a Lagrangian closure
S. Vajedi, K. Gustavsson, B. Mehlig +1
The distribution of particle accelerations in turbulence is intermittent, with non-Gaussian tails that are quite different for light and heavy particles. In this article we analyse…
Helicity statistics in homogeneous and isotropic turbulence and turbulence models
Ganapati Sahoo, Massimo De Pietro, Luca Biferale
We study the statistical properties of helicity in direct numerical simulations of fully developed homogeneous and isotropic turbulence and in a class of turbulence shell models. W…
On the Vortex Dynamics in Fractal Fourier Turbulence
Alessandra S. Lanotte, Shiva Kumar Malapaka, Luca Biferale
Incompressible, homogeneous and isotropic turbulence is studied by solving the Navier-Stokes equations on a reduced set of Fourier modes, belonging to a fractal set of dimension $D…
Intermittency in fractal Fourier hydrodynamics: Lessons from the Burgers Equation
Michele Buzzicotti, Luca Biferale, Uriel Frisch +1
We present theoretical and numerical results for the one-dimensional stochastically forced Burgers equation decimated on a fractal Fourier set of dimension . We investigate the…