Tag: Turbulence
Subgrid dynamo model reproduces magnetic field cycles in thin disks
What the study found A subgrid model of a helical large-scale dynamo with dynamical quenching was derived and implemented in general-relativistic resistive magnetohydrodynamic simulations of geometrically thin accretion disks. The model reproduced butterfly diagrams seen in earlier simulations and, in some cases, produced weak collimated polar outflows. Why the authors say this matters The authors…
Navier–Stokes turbulence shows sensitivity in statistics
What the study found The study reports that Navier–Stokes turbulence can show “ultra-chaos,” meaning that very small changes in starting conditions can lead to large differences not only in the flow path but also in flow symmetry and statistical behavior. The authors present this using two-dimensional turbulent Kolmogorov flow as an example. Why the authors…
Turbulent black hole coronae can produce observed X-ray spectra
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in AstrophysicsSimulations show turbulent black hole coronae generate two-temperature plasmas with extended nonthermal ion distributions while producing observed X-ray spectra.
DM Tau disk shows non-thermal line broadening
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in AstrophysicsBayesian analysis of molecular line observations confirms nonthermal broadening of 0.4 sound speeds in the DM Tau protoplanetary disk, providing evidence for turbulence.
Structure-preserving simulations show differing turbulence behavior
Structure-preserving simulations of three magnetohydrodynamics models reveal divergent cascade mechanisms and vorticity dynamics despite shared Hamiltonian geometry.
Predictive gyrokinetic simulations matched TCV edge-plasma data
Fully predictive gyrokinetic simulations of tokamak edge turbulence using Gkeyll validate against TCV experiments and reveal how negative triangularity enhances confinement through E×B flow shear.
