On the role of initial and boundary conditions in numerical simulations of accretion flows
文献类型：期刊论文
| 作者 | Bu, De-Fu1; Yuan, Feng1 ; Wu, Maochun1,2; Cuadra, Jorge1,3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2013-09-01 |
| 卷号 | 434期号:2页码:1692-1701 |
| 关键词 | accretion accretion discs black hole physics hydrodynamics |
| 英文摘要 | We study the effects of initial and boundary conditions, taking two-dimensional hydrodynamical numerical simulations of hot accretion flow as an example. The initial conditions considered include a rotating torus, a solution expanded from the one-dimensional global solution of hot accretion flows, injected gas with various angular momentum distributions, and the gas from a large-scale numerical simulation. Special attention is paid to the radial profiles of the mass accretion rate and density. Both can be described by a power-law function, M r(s) and proportional to r(-p). We find that if the angular momentum is not very low, the value of s is not sensitive to the initial condition and lies within a narrow range, 0.47 less than or similar to s less than or similar to 0.55. However, the value of p is more sensitive to the initial condition and lies in the range 0.48 less than or similar to p less than or similar to 0.8. The diversity of the density profile is because different initial conditions give different radial profiles of radial velocity due to the different angular momentum of the initial conditions. When the angular momentum of the accretion flow is very low, the inflow rate is constant with radius. Taking the torus model as an example, we have also investigated the effects of inner and outer boundary conditions by considering the widely adopted 'outflow' boundary condition and the 'mass flux conservation' condition. We find that the results are not sensitive to these two boundary conditions. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ADVECTION-DOMINATED ACCRETION ; ACTIVE GALACTIC NUCLEI ; SGR-A-ASTERISK ; 3-DIMENSIONAL MAGNETOHYDRODYNAMIC SIMULATIONS ; CENTRAL BLACK-HOLES ; 2 SPACE DIMENSIONS ; STELLAR WINDS ; 2-DIMENSIONAL MODELS ; ASTROPHYSICAL FLOWS ; ELLIPTIC GALAXIES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000323638200060 |
| 公开日期 | 2014-10-30 |
| 源URL | [http://119.78.226.72//handle/331011/15361]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago, Chile |
| 推荐引用方式 GB/T 7714 | Bu, De-Fu,Yuan, Feng,Wu, Maochun,et al. On the role of initial and boundary conditions in numerical simulations of accretion flows[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,434(2):1692-1701. |
| APA | Bu, De-Fu,Yuan, Feng,Wu, Maochun,&Cuadra, Jorge.(2013).On the role of initial and boundary conditions in numerical simulations of accretion flows.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,434(2),1692-1701. |
| MLA | Bu, De-Fu,et al."On the role of initial and boundary conditions in numerical simulations of accretion flows".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 434.2(2013):1692-1701. |
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来源：上海天文台
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