2009/05/11 by Dan Škandera, Wolf‐Christian Müller, Wolf-Christian Müller · 2 citations
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Atomic physics #Buoyancy #Classical mechanics #Convection #Excited state #Geomagnetism and Paleomagnetism Studies #Helicity #Ionosphere and magnetosphere dynamics #Magnetic field #Magnetohydrodynamic drive #Magnetohydrodynamic turbulence #Magnetohydrodynamics #Mechanics #Nonlinear system #Physics #Quantum mechanics #Solar and Space Plasma Dynamics #Turbulence #astro-ph.SR
paper · pdf · doi:10.1103/physrevlett.102.224501
published in Physical Review Letters 102(22), 224501 (American Physical Society) · 4 pages, 4 figures, accepted for publication in PRL
arxiv created 2009/05/11 · openalex publication_date 2009/06/03 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The dynamics of spectral transport in two-dimensional turbulent convection of electrically conducting fluids is studied by means of direct numerical simulations in the frame of the magnetohydrodynamic Boussinesq approximation. The system performs quasioscillations between two different regimes of small-scale turbulence: one dominated by nonlinear magnetohydrodynamic interactions; the other governed by buoyancy forces. The self-excited change of turbulent states is reported here for the first time. The process is controlled by the ideal invariant cross helicity, H;C=integralSdSv.b. The observations are explained by the interplay of convective driving with the nonlinear spectral transfer of total magnetohydrodynamic energy and cross helicity.