2013/04/30 by J. Pratt, A. Busse, W. -C. Mueller +1 · 26 citations
Biochemistry, Genetics and Molecular Biology · Engineering · Physics and Astronomy · #Convection #Dynamo #Dynamo theory #Fluid dynamics and aerodynamics studies #Geomagnetism and Paleomagnetism Studies #Magnetic field #Magnetohydrodynamic drive #Magnetohydrodynamic turbulence #Magnetohydrodynamics #Solar and Space Plasma Dynamics #Turbulence #astro-ph.SR #physics.comp-ph
paper · pdf · doi:10.1051/0004-6361/201321613
published in Astronomy and Astrophysics 557, A76 (EDP Sciences)
openalex publication_date 2013/07/31 · arxiv created 2013/09/05 · arxiv updated 2013/09/06 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Intermittent large-scale high-shear flows are found to occur frequently and spontaneously in direct numerical simulations of statistically stationary turbulent Boussinesq magnetohydrodynamic (MHD) convection. The energetic steady state of the system is sustained by convective driving of the velocity field and small-scale dynamo action. The intermittent emergence of flow structures with strong velocity and magnetic shearing generates magnetic energy at an elevated rate on time scales that are longer than the characteristic time of the large-scale convective motion. The resilience of magnetic energy amplification suggests that intermittent shear bursts are a significant driver of dynamo action in turbulent magnetoconvection.