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research
Hydrodynamic stability and mode coupling in Keplerian flows: local strato-rotational analysis
Authors
A. G. Tevzadze
Afshordi
+44Â more
Baggett
Balbus
Barranco
Brandenburg
Broberg
Butler
Chagelishvili
Chagelishvili
Chagelishvili
Chagelishvili
Chapman
Dubrulle
Farrell
G. D. Chagelishvili
Gebhardt
Gogoberidze
Goldreich
Grossmann
Gustavsson
Henningson
Ioannou
J.-P. Zahn
Ji
Johnson
Johnson
Klahr
Klahr
Lesur
Lominadze
Longaretti
Mukhopadhyay
Rayleigh
Reddy
Reddy
Reshotko
Richard
Shen
Tagger
Tevzadze
Trefethen
Umurhan
Umurhan
Umurhan
Yecko
Publication date
21 November 2007
Publisher
'EDP Sciences'
Doi
Cite
View
on
arXiv
Abstract
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 generation of spiral-density waves (also called inertia-gravity or
g
Ω
g\Omega
g
Ω
waves) by the vortex mode through linear mode coupling in shear flows. Methods. Non-modal analysis of linearized Boussinesq equations written in the shearing sheet approximation of accretion disk flows. Results. It is shown that the combined action of rotation and stratification introduces a new degree of freedom -- vortex mode perturbation -- which is linearly coupled with the spiral-density waves. These two modes are jointly able to extract energy from the background flow and they govern the disk dynamics in the small-scale range. The transient behavior of these modes is determined by the non-normality of the Keplerian shear flow. Tightly leading vortex mode perturbations undergo substantial transient growth, then, becoming trailing, inevitably generate trailing spiral-density waves by linear mode coupling. This course of events -- transient growth plus coupling -- is particularly pronounced for perturbation harmonics with comparable azimuthal and vertical scales and it renders the energy dynamics similar to the 3D unbounded plane Couette flow case. Conclusions. Our investigation strongly suggests that the so-called bypass concept of turbulence, which has been recently developed by the hydrodynamic community for spectrally stable shear flows, can also be applied to Keplerian disks. This conjecture may be confirmed by appropriate numerical simulations that take in account the vertical stratification and consequent mode coupling in the high Reynolds number regime.Comment: A&A (accepted
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