Numerical Simulations of Convective Accretion Flows in Three Dimensions | Zendy

I. V. Igumenshchev | Zendy; M. A. Abramowicz | Zendy; Ramesh Narayan | Zendy

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Numerical Simulations of Convective Accretion Flows in Three Dimensions

Author(s) -

I. V. Igumenshchev,

M. A. Abramowicz,

Ramesh Narayan

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/312755

Subject(s) - rotational symmetry , physics , eddy , angular momentum , convection , advection , mechanics , accretion (finance) , classical mechanics , convective flow , momentum (technical analysis) , turbulence , astrophysics , thermodynamics , finance , economics

Advection-dominated accretion flows (ADAFs) are known to be convectivelyunstable for low values of the viscosity parameter alpha. Two-dimensionalaxisymmetric hydrodynamic simulations of such flows reveal a radial densityprofile which is significantly flatter than the rho~r^{-3/2} expected for acanonical ADAF. The modified density profile is the result of inward transportof angular momentum by axisymmetric convective eddies. We presentthree-dimensional hydrodynamic simulations of convective ADAFs which are freeof the assumption of axisymmetry. We find that the results are qualitativelyand quantitatively similar to those obtained with two-dimensional simulations.In particular, the convective eddies are nearly axisymmetric and transportangular momentum inward.Comment: 12 pages, 5 figures, submitted to Ap

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