Zobrazeno 1 - 10
of 519
pro vyhledávání: '"Busse, F."'
Autor:
Simitev, R. D., Busse, F. H.
The range of existence and the properties of two essentially different chaotic attractors found in a model of nonlinear convection-driven dynamos in rotating spherical shells are investigated. A hysteretic transition between these attractors is estab
Externí odkaz:
http://arxiv.org/abs/1204.2316
Autor:
Simitev, R. D., Busse, F. H.
A physically consistent model of magnetic field generation by convection in a rotating spherical shell with a minimum of parameters is applied to the Sun. Despite its unrealistic features the model exhibits a number of properties resembling those obs
Externí odkaz:
http://arxiv.org/abs/1201.6227
Publikováno v:
Procs 2010 CTR Summer Program, P. Moin (ed.), pp. 475-484, Stanford University, 2010
We report the results of three-dimensional numerical simulations of convection-driven dynamos in relatively thin rotating spherical shells that show a transition from an strong non-oscillatory dipolar magnetic field to a weaker regularly oscillating
Externí odkaz:
http://arxiv.org/abs/1102.1092
Autor:
Simitev, R. D., Busse, F. H.
Publikováno v:
in Procs 2010 CTR Summer Program, P. Moin (ed.), pp. 475-484, Stanford University, 2010
Thermal convection in fluid layers heated from below are usually realized experimentally as well as treated theoretically with fixed boundaries on which conditions for the temperature and the velocity field are prescribed. The thermal and velocity bo
Externí odkaz:
http://arxiv.org/abs/1102.1090
Autor:
Simitev, R. D., Busse, F. H.
Some concepts used in the theory of convection-driven dynamos in rotating spherical fluid shells are discussed. The analogy between imposed magnetic fields and those generated by dynamo action is evaluated and the role of the Elsasser number is consi
Externí odkaz:
http://arxiv.org/abs/1012.1506
We present results on modeling solar pores and sunspots using 2D axisymmetric magneto-hydrodynamic (MHD) simulations. These models are helpful for understanding the mechanisms of magnetic field concentration in sunspots, and the large-scale flow patt
Externí odkaz:
http://arxiv.org/abs/1006.4156
Autor:
Simitev, R. D., Busse, F. H.
Publikováno v:
J. Fluid Mech., 532, pp. 365 - 388, 2005
The value of the Prandtl number $P$ exerts a strong influence on convection-driven dynamos in rotating spherical shells filled with electrically conducting fluids. Low Prandtl numbers promote dynamo action through the shear provided by differential r
Externí odkaz:
http://arxiv.org/abs/0910.4493
Autor:
Simitev, R. D., Busse, F. H.
Publikováno v:
New J. Phys., 5, 97.1-97.20, 2003
Patterns of convection in internally heated, self-gravitating rotating spherical fluid shells are investigated through numerical simulations. While turbulent states are of primary interest in planetary and stellar applications the present paper empha
Externí odkaz:
http://arxiv.org/abs/0906.1290
Autor:
Busse, F. H., Simitev, R. D.
Publikováno v:
in "Mathematical Aspects of Natural Dynamos", E. Dormy, A.M. Soward (eds.), Grenoble Sciences and CRC Press, Boca Raton, pp. 119-198, ISBN-13:978-1-58488-954-0, 2007
The chapter begins with a description of the annulus model of rotationg convection. The basic equations for the spherical problem are then introduced and the onset of columnar convection in spherical shells is discussed. The onset of inertial mode co
Externí odkaz:
http://arxiv.org/abs/0906.1124
Autor:
Busse, F. H., Simitev, R. D.
Publikováno v:
Procs. Intern. Astron. Union, 2, 467, 2007
Possibilities and difficulties of applying the theory of magnetic field generation by convection flows in rotating spherical fluid shells to the Giant Planets are outlined. Recent progress in the understanding of the distribution of electrical conduc
Externí odkaz:
http://arxiv.org/abs/0906.0171