603 citations · 1.6k across the 72 of their papers we have counts for
13 papers · 1 filter
The magneto-rotational instability near threshold: spatio-temporal amplitude equation and saturation
O. Regev
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 give…
Hydrodynamical activity in thin accretion disks
Oded Regev
An asymptotic treatment of thin accretion disks, introduced by Kluźniak & Kita (2000) for a steady-state disk flow, is extended to a time-dependent problem. Transient growth of axi…
On the viability of the shearing box approximation for numerical studies of MHD turbulence in accretion disks
O. Regev, O. M. Umurhan
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) approx…
Chaos and complexity in astrophysics
Oded Regev
Methods and techniques of the theory of nonlinear dynamical systems and patterns can be useful in astrophysical applications. Some works on the subjects of dynamical astronomy, ste…
Hydrodynamic response of rotationally supported flows in the Small Shearing Box model
A. Sternberg, O. M. Umurhan, Y. Gil +1
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 …
On the nonlinear saturation of the magnetorotational instability near threshold in a thin-gap Taylor-Couette setup
O. M. Umurhan, O. Regev, K. Menou
We study the saturation near threshold of the axisymmetric magnetorotational instability (MRI) of a viscous, resistive, incompressible fluid in a thin-gap Taylor-Couette configurat…
A weakly nonlinear analysis of the magnetorotational instability in a model channel flow
O. M. Umurhan, K. Menou, O. Regev
We show by means of a perturbative weakly nonlinear analysis that the axisymmetric magnetorotational instability (MRI) of a viscous, resistive, incompressible rotating shear flow i…
Hydrodynamical stability of thin accretion discs: transient growth of global axisymmetric perturbations
O. M. Umurhan, A. Nemirovsky, O. Regev +1
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 a…
Hydrodynamic stability of rotationally supported flows: Linear and nonlinear 2D shearing box results
O. M. Umurhan, O. Regev
We present here both analytical and numerical results of hydrodynamic stability investigations of rotationally supported circumstellar flows using the shearing box formalism. Asymp…
Launching jets from the boundary layer of accretion disks in young stellar objects
Noam Soker, Oded Regev
We reexamine a previously proposed model for thermal pressure acceleration of collimated outflows in young stellar objects (YSO). We are motivated by new results from recent X-ray…
Asymptotic models of meridional flows in thin viscous accretion disks
O. Regev, L. Gitalman
We present the results of numerical integrations yielding the structure of and meridional flow in axisymmetric thin viscous accretion disk models. The solutions are obtained by sim…
On the effects of the stellar magnetic field on the structure of T Tauri accretion discs
Y. Ulchin, O. Regev, G. A. Wynn
The structure of accretion discs around magnetic T Tauri stars is numerically calculated using a particle hydrodynamical code, in which magnetic interaction is included in the fram…
Thermal Equilibria of Accretion Disks
Marek A. Abramowicz, Xingming Chen, Shoji Kato +2
We show that most of hot, optically thin accretion disk models which ignore advective cooling are not self-consistent. We have found new types of optically thin disk solutions wher…