Kinematic roll dynamo computations at large magnetic Reynolds number
نویسندگان
چکیده
منابع مشابه
Large Kinematic Dynamo and Intermittence
The large time asymptotics of a magnetic eld in a turbulent-correlated (in time) ow of an ideal incompressible uid are studied. It is shown that the magnetic eld exhibits the dynamo eeect (exponential stretching) unless the Lagrangian ow generated by the velocity eld is (almost surely) distance preserving; and it is intermittent unless the Lagrangian ow associated to the turbulent component of ...
متن کاملAnisotropy of magnetohydrodynamic turbulence at low magnetic Reynolds number
Turbulent fluctuations in magnetohydrodynamic flows are known to become anisotropic under the action of a sufficiently strong magnetic field. We investigate this phenomenon in the case of low magnetic Reynolds number using direct numerical simulations and large eddy simulations of a forced flow in a periodic box. A series of simulations is performed with different strengths of the magnetic fiel...
متن کاملLarge Kinematic Dynamo and Intermittence in a Turbulent Flow
The large time asymptotics of a magnetic eld in a turbulent -correlated (in time) ow of an ideal incompressible uid are studied. It is shown that the magnetic eld exhibits the dynamo e ect (exponential stretching) unless the Lagrangian ow generated by the velocity eld is (almost surely) distance preserving; and it is intermittent unless the Lagrangian ow associated to the turbulent component of...
متن کاملSpectra and Growth Rates of Fluctuating Magnetic Fields in the Kinematic Dynamo Theory with Large Magnetic Prandtl Numbers
The existence of a weak galactic magnetic field has been repeatedly confirmed by observational data. The origin of this field has not as yet been explained in a fully satisfactory way and represents one of the main challenges of the astrophysical dynamo theory. In both the galactic dynamo theory and the primordial-origin theory, a major influence is exerted by the small-scale magnetic fluctuati...
متن کاملProblems with kinematic mean field electrodynamics at high magnetic Reynolds numbers
We discuss the applicability of the kinematic α-effect formalism at high magnetic Reynolds numbers. In this regime the underlying flow is likely to be a small-scale dynamo, leading to the exponential growth of fluctuations. Difficulties arise with both the actual calculation of the α coefficients and with its interpretation. We argue that although the former may be circumvented — and we outline...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: ANZIAM Journal
سال: 2004
ISSN: 1445-8810
DOI: 10.21914/anziamj.v45i0.931