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Numerical simulation of hot accretion flows with thermal conduction

Science china(Physics,Mechanics & Astronomy) 2010年第S1期53卷 168-172页

作者： wu maochun,yuan feng & bu defu key laboratory for research in galaxies and cosmology,shanghai astronomical observatory,chinese academy of sciences,shanghai 200030,china 1. key laboratory for research in galaxies and cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China

We report on the effects of isotropic thermal conduction in non-radiative collisionless accretion flows in two *** comparison to accretion flows without conduction,we find that the disk generally becomes cooler and ***,the magnitude of this effect depends on the kinetic viscosity *** it is proportional to density,the density profile of the accretion flow is flat,therefore the effect is not very ***,if it is proportional to r1/2,as is usual for the "α" disk description,the density profile is ***,the effect will be much more obvious,with the temperature profile of the accretion flow becoming much *** will have important observational consequences.

关键词： black hole accretion disk thermal conduction

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

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Science china(Physics,Mechanics & Astronomy) 2010年第S1期53卷 139-142页

作者： bu defu,yuan feng,wu maochun & YANG XiaoHong key laboratory for research in galaxies and cosmology,shanghai astronomical observatory,chinese academy of sciences,shanghai 200030,china 1. key laboratory for research in galaxies and cosmology Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China

We investigate the effects of various ways of injection of gas at the outer boundary in the numerical simulations of non-viscous accretion *** study three *** Model A,we inject material around the equatorial *** Models B and C,fullrange θ injection is used(we employ spherical coordinates).In all three models,the injected material has the same density distribution with polar angle θ.From the equatorial region to the polar regions,angular momentum of the injected material of Model B decreases faster than that in Model *** 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 *** find that the accretion rates of Models B and C are more than ten times higher than that in Model *** Model A,there is weak accretion only in the torus and outflows are found on the surface of the *** Model B,we find strong inflows on the surface of its torus,and the accretion in the torus is *** 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 *** 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 ∝r-3/2,P ∝r-2 and l∝r0.

关键词： accretion accretion discs-black hole physics-hydrodynamics numerical

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