Zobrazeno 1 - 10
of 59
pro vyhledávání: '"Chagelishvili, G. D."'
We find and investigate via numerical simulations self-sustained two-dimensional turbulence in a magnetohydrodynamic flow with a maximally simple configuration: plane, noninflectional (with a constant shear of velocity) and threaded by a parallel uni
Externí odkaz:
http://arxiv.org/abs/1409.8543
We investigate linear dynamics of non-axisymmetric perturbations in incompressible, vertically stratified Keplerian discs with a weak vertical magnetic field in the shearing box approximation. Perturbations are decomposed into shearing waves whose ev
Externí odkaz:
http://arxiv.org/abs/1308.1058
We investigate mode coupling in a two dimensional compressible disc with radial stratification and differential rotation. We employ the global radial scaling of linear perturbations and study the linear modes in the local shearing sheet approximation
Externí odkaz:
http://arxiv.org/abs/0909.2844
Aims. Qualitative analysis of key (but yet unappreciated) linear phenomena in stratified hydrodynamic Keplerian flows: (i) the occurrence of a vortex mode, as a consequence of strato-rotational balance, with its transient dynamics; (ii) the generatio
Externí odkaz:
http://arxiv.org/abs/0710.3648
Flow nonnormality induced linear transient phenomena in thin self-gravitating astrophysical discs are studied in the shearing sheet approximation. The considered system includes two modes of perturbations: vortex and (spiral density) wave. It is show
Externí odkaz:
http://arxiv.org/abs/0708.3753
Autor:
Chagelishvili, G. D., Tevzadze, A. G.
We analyze the scepticism on the hydrodynamic turbulence in Keplerian astrophysical disks expressed in Balbus and Hawley 2006 and show the failure of arguments of the paper.
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611059
Publikováno v:
Phys.Plasmas 11:4672,2004
Special features of magnetohydrodynamic waves linear dynamics in smooth shear flows are studied. Quantitative asymptotic and numerical analysis are performed for wide range of system parameters when basic flow has constant shear of velocity and unifo
Externí odkaz:
http://arxiv.org/abs/astro-ph/0510115
Special features of surface gravity waves in deep fluid flow with constant vertical shear of velocity is studied. It is found that the mean flow velocity shear leads to non-trivial modification of surface gravity wave modes dispersive characteristics
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509846
Publikováno v:
Astron.Astrophys. 402 (2003) 401-408
This paper deals with the problem of hydrodynamic shear turbulence in non-magnetized Keplerian disks. We wish to draw attention to a route to hydrodynamic turbulence which seems to be little known by the astrophysical community, but which has been in
Externí odkaz:
http://arxiv.org/abs/astro-ph/0302258
Linear dynamics of the solar convection zone: excitation of waves in unstably stratified shear flows
In this paper we report on the nonresonant conversion of convectively unstable linear gravity modes into acoustic oscillation modes in shear flows. The convectively unstable linear gravity modes can excite acoustic modes with similar wave-numbers. Th
Externí odkaz:
http://arxiv.org/abs/astro-ph/0006132