Hydrodynamic convection in accretion discs
Hydrodynamic convection in accretion discs
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吸积盘中的流体动力对流
DOI:
10.1093/mnras/sty2097
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发表时间:
2018
影响因子:
4.8
通讯作者:
Held L
中科院分区:
文献类型:
--
作者:
Held L
The prevalence and consequences of convection perpendicular to the plane of accretion discs have been discussed for several decades. Recent simulations combining convection and the magnetorotational instability have given fresh impetus to the debate, as the interplay of the two processes can enhance angular momentum transport, at least in the optically thick outburst stage of dwarf novae. In this paper, we seek to isolate and understand the most generic features of disc convection, and so undertake its study in purely hydrodynamical models. First, we investigate the linear phase of the instability, obtaining estimates of the growth rates both semi-analytically, using one-dimensional spectral computations, and analytically, using WKBJ methods. Next, we perform three-dimensional, vertically stratified, shearing box simulations with the conservative, finite-volume codepluto, both with and without explicit diffusion coefficients. We find that hydrodynamic convection can, in general, drive outward angular momentum transport, a result that we confirm withathena, an alternative finite-volume code. Moreover, we establish that the sign of the angular momentum flux is sensitive to the diffusivity of the numerical scheme. Finally, in sustained convection, whereby the system is continuously forced to an unstable state, we observe the formation of various coherent structures, including large-scale and oscillatory convective cells, zonal flows, and small vortices.
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DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
W. Kley;J. Papaloizou;D. Lin
通讯作者:
D. Lin
DOI:
10.1086/173269
发表时间:
1993
期刊:
The Astrophysical Journal
影响因子:
--
作者:
D. Lin;J. Papaloizou;W. Kley
通讯作者:
W. Kley
DOI:
--
发表时间:
1980
期刊:
影响因子:
--
作者:
D. Lin;J. Papaloizou
通讯作者:
J. Papaloizou
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
W. Cabot
通讯作者:
W. Cabot
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
A. Boley;R. Durisen
通讯作者:
R. Durisen