Particle-Laden Turbulence from the Streaming Instability

Details Particle-Laden Turbulence from the Streaming Instability Particle-Laden Turbulence from the Streaming Instability

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dda....37.0304y&link_type=abstract

American Astronomical Society, DDA meeting #37, #3.04; Bulletin of the American Astronomical Society, Vol. 38, p.667

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I will present recent work on a novel and robust type of turbulence which arises spontaneously in protoplanetary disks due to the drag forces between particles and gas. This "particle laden" turbulence is driven by the amplification of the streaming instability identified by Youdin & Goodman (2005). The physics of this system is considerably simpler than the well-known vertical shear (or Kelvin-Helmholtz) instability, allowing us to isolate the role of aerodynamic coupling. The nonlinear behavior is studied with a hydrodynamics code to simulate the gas and N-body particle integrations for the solids. Even in the absence of self-gravity we find that particle clumping is energetically favored. The relevance of particle overdensities, and other aspects of the turbulent flow, to planetesimal formation will be discussed.

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