Transient dynamics of perturbations in astrophysical disks

Razdoburdin, Dmitry N.; Zhuravlev, V. V.

doi:10.3367/ufnr.0185.201511a.1129

Cited by 3 publications

(3 citation statements)

References 130 publications

(224 reference statements)

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“…With increase of the Reynolds number, the range of the wave numbers of perturbations which cause the instability of the boundary layer expands without limits. For a typical accretion disk, one can estimate that Re ∼ 10 10 [7]. Even if we determine the Reynolds number from the value of the tangential velocity difference (58), its estimate decreases by two or three orders of magnitude only.…”

Section: Application To Accretion Disksmentioning

confidence: 98%

“…In the Introduction, we mentioned that small amplitude perturbations are either stable (for instant, radial ones are stable by the Rayleigh criterion [22]), or display only a weak instability (some nonaxisymmetric perturbations are unstable [7], but they have rather large time scale of growth). On the contrary, non-linear waves can participate in the universal scenario of generation of shock waves and tangential discontinuities which is realized in any environment with ordinary equation of state [6,13].…”

Section: The Structure Of Accretion Flows In Young Binaries With Circmentioning

confidence: 99%

“…The reason for this is spectral stability of the Keplerian flow. There are non-modal type perturbations or transient ones, which display a growth in the linear stage (see a review in [7]). However, the problem of the mechanism of their continuous generation in the Keplerian flow, as well as the problem of efficiency of removal of angular momentum, on large time scales needs further study.…”

Section: Introductionmentioning

confidence: 99%

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Excitation of turbulence in accretion disks of binary stars by non-linear perturbations

Kurbatov

Бисикало

2017

Astron. Rep.

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Accretion disks in binary systems can experience hydrodynamic impact at inner as well as outer edges. The first case is typical for protoplanetary disks around young T Tau stars. The second one is typical for circumstellar disks in close binaries. As a result of such an impact, perturbations with different scales and amplitudes are excited in the disk. We investigated the nonlinear evolution of perturbations of a finite, but small amplitude, at the background of sub-Keplerian flow. Nonlinear effects at the front of perturbations lead to the formation of a shock wave, namely the discontinuity of the density and radial velocity. At this, the tangential flow in the neighborhood of the shock becomes equivalent to the flow in in the boundary layer. Instability of the tangential flow further leads to turbulization of the disk. Characteristics of the turbulence depend on perturbation parameters, but α-parameter of Shakura-Sunyaev does not exceed ∼ 0.1.

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Section: Application To Accretion Disksmentioning

confidence: 98%

Section: The Structure Of Accretion Flows In Young Binaries With Circmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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