On the effect of injection of gas in the numerical simulation of accretion flows

	On the effect of injection of gas in the numerical simulation of accretion flows
	Bu DeFu; Yuan Feng; Wu MaoChun; Yang XiaoHong
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2010
卷号	53 期号:1 页码:139-142
关键词	accretion accretion discs-black hole physics-hydrodynamics numerical
英文摘要	We investigate the effects of various ways of injection of gas at the outer boundary in the numerical simulations of non-viscous accretion flows. We study three models. In Model A, we inject material around the equatorial plane. In Models B and C, full-range theta injection is used (we employ spherical coordinates). In all three models, the injected material has the same density distribution with polar angle theta. From the equatorial region to the polar regions, angular momentum of the injected material of Model B decreases faster than that in Model C. For all of the models, after a transient episode of infall at the beginning of the simulations, the gas piles up in the equatorial regions outside the black hole and forms a thick torus bounded by a centrifugal barrier. We find that the accretion rates of Models B and C are more than ten times higher than that in Model A. In Model A, there is weak accretion only in the torus and outflows are found on the surface of the torus. In Model B, we find strong inflows on the surface of its torus, and the accretion in the torus is weak. In Model C, strong inflows also occur on the surface of its torus, but the accretion regions are narrower and there are strong outflows in its torus. In all of our models, the time-averaged density, pressure and angular momentum in the equatorial region can be described by a radial power law, with P proportional to r(-3/2), P proportional to r(--2) and l proportional to r(0).
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	ANGULAR-MOMENTUM MATERIAL ; BLACK-HOLES ; 2 DIMENSIONS
收录类别	SCI
语种	英语
WOS记录号	WOS:000280291800032
公开日期	2011-06-29
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/13371]
专题	上海天文台_星系宇宙学重点实验室
作者单位	Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Bu DeFu,Yuan Feng,Wu MaoChun,et al. On the effect of injection of gas in the numerical simulation of accretion flows[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2010,53(1):139-142.
APA	Bu DeFu,Yuan Feng,Wu MaoChun,&Yang XiaoHong.(2010).On the effect of injection of gas in the numerical simulation of accretion flows.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,53(1),139-142.
MLA	Bu DeFu,et al."On the effect of injection of gas in the numerical simulation of accretion flows".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 53.1(2010):139-142.