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37 papers · 1 filter
Relaxation of the turbulent magnetosheath
Francesco Pecora, Yan Yang, Alexandros Chasapis +9
In turbulence, nonlinear terms drive energy transfer from large-scale eddies into small scales through the so-called energy cascade. Turbulence often relaxes toward states that min…
Resistive instabilities in sinusoidal shear flows with a streamwise magnetic field
Adrian E. Fraser, Imogen G. Cresswell, Pascale Garaud
We investigate the linear stability of a sinusoidal shear flow with an initially uniform streamwise magnetic field in the framework of incompressible magnetohydrodynamics (MHD) wit…
Connecting Large-Scale Velocity and Temperature Bursts with Small-Scale Intermittency in Stratified Turbulence
Fabio Feraco, Raffaele Marino, Leonardo Primavera +13
Non-Gaussian statistics of large-scale fields are routinely observed in data from atmospheric and oceanic campaigns and global models. Recent direct numerical simulations (DNSs) sh…
Convective dynamics with mixed temperature boundary conditions: why thermal relaxation matters and how to accelerate it
Evan H. Anders, Geoffrey M. Vasil, Benjamin P. Brown +1
Astrophysical simulations of convection frequently impose different thermal boundary conditions at the top and the bottom of the domain in an effort to more accurately model natura…
The nature of mean-field generation in three classes of optimal dynamos
Axel Brandenburg, Long Chen
In recent years, several optimal dynamos have been discovered. They minimize the magnetic energy dissipation or, equivalently, maximize the growth rate at a fixed magnetic Reynolds…
Single-particle Lagrangian statistics from direct numerical simulations of rotating-stratified turbulence
Dhawal Buaria, Alain Pumir, Fabio Feraco +4
Geophysical fluid flows are predominantly turbulent and often strongly affected by the Earth's rotation, as well as by stable density stratification. Using direct numerical simulat…