10 papers
Numerical simulations of shock-driven, supersonic interstellar turbulence in colliding three-temperature laboratory plasmas
Stefano Merlini, James R. Beattie, Vicente Valenzuela-Villaseca
Shock-driven turbulence is central to astrophysical plasmas in which explosions and compressive driving inject energy through shocks rather than steady stirring. We present three-d…
What is the Strouhal number of turbulence driven by supernovae?
James R. Beattie, Isabelle Connor, Enrico Ramirez-Ruiz
The Strouhal number, , measures the temporal coherence of turbulent driving relative to the outer-scale eddy turnover time. In turbulence-box mod…
The universal growth of magnetic energy during the nonlinear phase of subsonic and supersonic small-scale dynamos
Neco Kriel, James R. Beattie, Mark R. Krumholz +2
Small-scale dynamos (SSDs) amplify magnetic fields in turbulent plasmas. Theory predicts nonlinear magnetic energy growth , but this scali…
Conservation of magnetic-helicity fluctuations due to spatial decorrelation of fluxes in decaying MHD turbulence
Justin Kin Jun Hew, David N. Hosking, Christoph Federrath +2
Hosking & Schekochihin (2021, Phys. Rev. X 11, 041005) have proposed that statistically isotropic decaying MHD turbulence without net magnetic helicity conserves the mean square fl…
So long Kolmogorov: the forward and backward turbulence cascades in a supernovae-driven, multiphase interstellar medium
James R. Beattie, Anne Noer Kolborg, Enrico Ramirez-Ruiz +1
The interstellar medium (ISM) of disk galaxies is turbulent, and yet the fundamental nature of ISM turbulence, the energy cascade, is not understood in detail. In this study, we us…
Taking control of compressible modes: bulk viscosity and the turbulent dynamo
James R. Beattie, Christoph Federrath, Neco Kriel +2
Many polyatomic astrophysical plasmas are compressible and out of chemical and thermal equilibrium, introducing a bulk viscosity into the plasma via the internal degrees of freedom…