Year: 2013
Type: article
Abstract: We perform a suite of two- and three-dimensional magnetohydrodynamic (MHD) simulations with the athena code of the non-driven Kelvin–Helmholtz instability in the subsonic, weak magnetic field limit. Focusing the analysis on the non-linear turbulent regime, we quantify energy transfer on a scale-by-scale basis and identify the physical mechanisms responsible for energy exchange by developing the diagnostic known as spectral energy transfer function analysis. At late times when the fluid is in a state of MHD turbulence, magnetic tension mediates the dominant mode of energy injection into the magnetic reservoir, whereby turbulent fluid motions twist and stretch the magnetic field lines. This generated magnetic energy turbulently cascades to smaller scales, while being exchanged backwards and forwards with the kinetic energy reservoir, until finally being dissipated. Incorporating explicit dissipation pushes the dissipation scale to larger scales than if the dissipation were entirely numerical. For scales larger than the dissipation scale, we show that the physics of energy transfer in decaying MHD turbulence is robust to numerical effects.
Authors: Greg Salvesen, Kris Beckwith, Jacob B. Simon, Sean M. O'Neill, Mitchell C. Begelman
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G1488140574, TOWARD A FIRST PRINCIPLES UNDERSTANDING OF X-RAY BINARY STATE TRANSITIONS THE VARIABILITY OF GALACTIC X-RAY BINARIES PROVIDES A UNIQUE PROBE OF TH, Planet Formation in Turbulent Disks, Formation of Supermassive Black Holes by Direct Collapse, PLANETARY DYNAMICS DURING DISK DISPERSAL:\NWE PROPOSE A THEORETICAL STUDY OF THE DYNAMICS OF MULTIPLE MASSIVE PLANET SYSTEMS DURING THE EPOCH WHEN TH, G6763847477, INTERNAL STRUCTURE AND STABILITY OF BLAZAR JETS:THE COMBINATION OF EXTERNAL PRESSURE, RELATIVISTIC SPEED AND MAGNETOHYDRODYNAMIC FORCES CAN CREATE C, MRI-Consortium: Acquisition of a Supercomputer by the Front Range Computing Consortium, G8413387445, WHILE THE COLLAPSAR ORIGIN OF LONG-DURATION GAMMA-RAY BURSTS IS OBSERVATIONALLY WELL-ESTABLISHED, THE COMPOSITION OF THE GRB JET REMAINS UNKNOWN, MAK
OpenAlex ID: W2019813416