Zobrazeno 1 - 10
of 175
pro vyhledávání: '"Tobias, S. M."'
In recent years, the Generalised Quasilinear (GQL) approximation has been developed and its efficacy tested against purely quasilinear (QL) approximations. GQL systematically interpolates between QL and fully non-linear dynamics by employing a genera
Externí odkaz:
http://arxiv.org/abs/2303.07204
This Special Topic focuses on magnetohydrodynamic (MHD) processes in deep interiors of planets, in which their fluid dynamos are in operation. The dynamo-generated, global, magnetic fields provide a background for our solar-terrestrial environment. P
Externí odkaz:
http://arxiv.org/abs/2211.05270
Autor:
Marston, J. B., Tobias, S. M.
Publikováno v:
Annual Reviews of Fluid Mechanics 55, 351 -- 375 (2023)
Understanding inhomogeneous and anisotropic fluid flows require mathematical and computational tools that are tailored to such flows and distinct from methods used to understand the canonical problem of homogeneous and isotropic turbulence. We review
Externí odkaz:
http://arxiv.org/abs/2205.05513
We consider direct statistical simulation (DSS) of a paradigm system of convection interacting with mean flows. In the Busse Annulus model zonal jets are generated through the interaction of convectively driven turbulence and rotation; non-trivial dy
Externí odkaz:
http://arxiv.org/abs/2203.03699
It is widely believed that statistical closure theories for dynamical systems provide statistics equivalent to those of the governing dynamical equations from which the former are derived. Here, we demonstrate counterexamples in the context of the wi
Externí odkaz:
http://arxiv.org/abs/2202.04127
Autor:
Cho, J. Y-K., Thrastarson, H. Th., Koskinen, T. T., Read, P. L., Tobias, S. M., Moon, W., Skinner, J. W.
We review the recent progress in understanding the jet structures on exoplanets as well as on and inside the Sun. The emphasis is on the more robust aspects of observation and numerical modeling that relate directly to jets. For the exoplanets, the p
Externí odkaz:
http://arxiv.org/abs/2010.09878
Publikováno v:
J. Fluid Mech. 904 (2020) R3
Finite-amplitude hydromagnetic Rossby waves in the magnetostrophic regime are studied. We consider the slow mode, which travels in the opposite direction to the hydrodynamic or fast mode, in the presence of a toroidal magnetic field and zonal flow by
Externí odkaz:
http://arxiv.org/abs/2007.10741
Publikováno v:
Proc. R. Soc. A 474, 20180422 (2018)
In this paper we examine the interaction of convection, rotation and mean flows in a thermal annulus. In this system mean flows are driven by correlations induced by rotation leading to non-trivial Reynolds stresses. The mean flows act back on the co
Externí odkaz:
http://arxiv.org/abs/1809.02523
Publikováno v:
Journal of Plasma Physics 85, 193-21 (2019)
Global magnetohydrodynamic (MHD) instabilities are investigated in a computationally tractable two-dimensional model of the solar tachocline. The model's differential rotation yields stability in the absence of a magnetic field, but if a magnetic fie
Externí odkaz:
http://arxiv.org/abs/1809.00921
In this paper we examine the role of weak magnetic fields in breaking Kelvin's circulation theorem and in vortex breakup in two-dimensional magnetohydrodynamics for the physically important case of a low magnetic Prandtl number (low $Pm$) fluid. We c
Externí odkaz:
http://arxiv.org/abs/1806.03922