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| Dubrulle, B; Marie, Louis; Normand, C; Richard, D; Hersant, F; Zahn, Jp. |
| We discuss the possibility that astrophysical accretion disks are dynamically unstable to non-axisymmetric disturbances with characteristic scales much smaller than the vertical scale height. The instability is studied using three methods: one based on the energy integral, which allows the determination of a sufficient condition of stability, one using a WKB approach, which allows the determination of the necessary and sufficient condition for instability and a last one by numerical solution. This linear instability occurs in any inviscid stably stratified differential rotating fluid for rigid, stress-free or periodic boundary conditions, provided the angular velocity Omega decreases outwards with radius r. At not too small stratification, its growth rate... |
| Tipo: Text |
Palavras-chave: Accretion; Accretion disks hydrodynamic instabilities turbulence. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/00253/36469/35013.pdf |
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