Tuesday, June 18, 2013

1306.3937 (Kacper Kowalik et al.)

Streaming instability in the quasi-global protoplanetary disks    [PDF]

Kacper Kowalik, Michal Hanasz, Dominik Wóltański, Artur Gawryszczak
We investigate streaming instability using two-fluid approximation (neutral gas and dust) in a quasi-global, unstratified protoplanetary disk, with the help of PIERNIK code. We compare amplification rate of the eigen-mode in numerical simulations, with the corresponding growth resulting from the linear stability analysis of full system of Euler's equation including aerodynamic drag. Following Youdin & Goodman (2005) we show that (1) rapid dust clumping occurs due to the difference in azimuthal velocities of gas and dust, coupled by the drag force, (2) initial density perturbations are amplified by several orders of magnitude. We demonstrate that the multi-fluid extension of the simple and efficient Relaxing TVD scheme, implemented in PIERNIK, leads to results, which are compatible with those obtained with other methods.
View original: http://arxiv.org/abs/1306.3937

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