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SUMMARY:Formation of vortices in protoplanetary disk by the subcritical ba
 roclinic instability and the vertical shear instability - Dr. Samuel Richa
 rd (QMUL)
DTSTART:20140520T120000Z
DTEND:20140520T130000Z
UID:TALK51178@talks.cam.ac.uk
CONTACT:Adrian Barker
DESCRIPTION:The presence of vortices in protoplanetary disk in a matter of
  debate for many years\, and a subject of interest because of the role the
 y can play in the dynamics of these disks. They can participate to the ang
 ular momentum transport migrating toward the star and they can play a role
  in the planetary formation\, concentrating the solid particles. Recent ob
 servation seems to confirm this hypothesis (Van der Marel 2013)\, detectin
 g local concentration of solid particles.\n\nThe subscritical baroclinic i
 nstability is able to form and amplify vortices under some conditions : fi
 nite amplitude perturbations due to the non linear trait of this instabili
 ty\, an unstable radial stratification\, and a heat transfer.\n\nAn opened
  issue is what can cause strong enough perturbation to trigger the subcrit
 ical baroclinic instability. One possibility is the vertical shear instabi
 lity which occur when the flow is vertically sheared and almost locally is
 othermal (fast heat transfer).\n\nI will present 2D simulations to answer 
 the question : “Is there a range of parameters for which both instabilit
 ies are possible ? ” \, and 3D simulations to answer the question : “C
 an the vertical shear instability in three dimension lead to the formation
  of vortices ? “
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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