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pro vyhledávání: '"Regev O"'
The short time evolution of three dimensional small perturbations is studied. Exhibiting spectral asymptotic stability, thin discs are nonetheless shown to host intensive hydrodynamical activity in the shape of non modal growth of initial small pertu
Externí odkaz:
http://arxiv.org/abs/1002.1719
Akademický článek
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The magneto-rotational instability near threshold: spatio-temporal amplitude equation and saturation
Autor:
Regev, O.
We show, by means of a perturbative weakly nonlinear analysis, that the axisymmetric magneto-rotational instability (MRI) in a magnetic Taylor-Couette (mTC) flow in a thin-gap gives rise, for very small magnetic Prandtl numbers (P_m), to a real Ginzb
Externí odkaz:
http://arxiv.org/abs/0801.1637
Autor:
Regev, O., Umurhan, O. M.
Most of our knowledge on the nonlinear development of the magneto-rotational instability (MRI) relies on the results of numerical simulations employing the shearing box (SB) approximation. A number of difficulties arising from this approach have rece
Externí odkaz:
http://arxiv.org/abs/0711.0794
The hydrodynamic response of the inviscid small shearing box model of a midplane section of a rotationally supported astrophysical disk is examined. An energy functional ${\cal E}$ is formulated for the general nonlinear problem. It is found that the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703358
We study the saturation near threshold of the axisymmetric magnetorotational instability (MRI) of a viscous, resistive, incompressible fluid in a thin-gap Taylor-Couette configuration. A vertical magnetic field, Keplerian shear and no-slip, conductin
Externí odkaz:
http://arxiv.org/abs/astro-ph/0702747
Publikováno v:
Phys.Rev.Lett.98:034501,2007
We show by means of a perturbative weakly nonlinear analysis that the axisymmetric magnetorotational instability (MRI) of a viscous, resistive, incompressible rotating shear flow in a thin channel gives rise to a real Ginzburg-Landau equation for the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0608374
The purpose of this paper is to explore how accretion discs manifest the phenomenon of transient growth on a global scale. We investigate analytically the time response of a thin accretion disc to particular axisymmetric perturbations. To facilitate
Externí odkaz:
http://arxiv.org/abs/astro-ph/0502389
Hydrodynamic stability of rotationally supported flows: Linear and nonlinear 2D shearing box results
Autor:
Umurhan, O. M., Regev, O.
Publikováno v:
Astron.Astrophys. 427 (2004) 855-872
We present here both analytical and numerical results of hydrodynamic stability investigations of rotationally supported circumstellar flows using the shearing box formalism. Asymptotic scaling arguments justifying the shearing box approximation are
Externí odkaz:
http://arxiv.org/abs/astro-ph/0404020