Numerical simulations of two-dimensional and three-dimensional accretion flows
| Autor: | Keisuke Sawada, Eiji Shima, Ulrich Anzer, Mario Livio, Takanori Ishii, Takuya Matsuda, Nobuhiro Sekino |
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| Rok vydání: | 1992 |
| Předmět: |
Physics
Computer simulation Astrophysics::High Energy Astrophysical Phenomena Astronomy and Astrophysics Eulerian path Instability Kármán vortex street Accretion (astrophysics) Physics::Fluid Dynamics symbols.namesake Classical mechanics Space and Planetary Science Incompressible flow symbols Two-dimensional flow Potential flow Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 255:183-191 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/255.2.183 |
| Popis: | Numerical simulations of 2D and 3D accretion flows past a gravitating compact object from a uniform flow at a large distance upstream are performed by solving the Eulerian equations. It is found that 2D flows exhibit a flip-flop instability if the central accreting body is small. If the central body is enlarged at some instance in the oscillating flow, then the accretion shock shows a rather periodic oscillation similar to the von Karman vortex street. In the case of 3D flows, it is found that the shock cone is much more robust than in 2D, and the flip-flop instability takes a different, probably less violent form. The causes for the instabilities are discussed |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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