Large‐Scale Properties in Turbulent Spherically Symmetric Accretion | Zendy

Arnab Ray | Zendy; Jayanta K. Bhattacharjee | Zendy

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Large‐Scale Properties in Turbulent Spherically Symmetric Accretion

Author(s) -

Arnab Ray,

Jayanta K. Bhattacharjee

Publication year - 2005

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 - 10.1086/430197

Subject(s) - inviscid flow , physics , turbulence , transonic , scaling , accretion (finance) , mechanics , compressibility , flow (mathematics) , horizon , inflow , scale (ratio) , classical mechanics , astrophysics , geometry , mathematics , astronomy , aerodynamics , quantum mechanics

The role of turbulence in a spherically symmetric accreting system has beenstudied on very large spatial scales of the system. This is also a highlysubsonic flow region and here the accreting fluid has been treated as nearlyincompressible. It has been shown here that the coupling of the mean flow andthe turbulent fluctuations, gives rise to a scaling relation for an effective"turbulent viscosity". This in turn leads to a dynamic scaling for soundpropagation in the accretion process. As a consequence of this scaling, thesonic horizon of the transonic inflow solution is shifted inwards, incomparison with the inviscid flow.Comment: 17 pages, AASTe

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