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SUMMARY:Tides in convective regions of planets and stars - Gordon Ogilvie 
 (DAMTP)
DTSTART:20120123T160000Z
DTEND:20120123T170000Z
UID:TALK35900@talks.cam.ac.uk
CONTACT:Jérôme Guilet
DESCRIPTION:I describe two calculations relevant to determining the effici
 ency of tidal dissipation in convective regions of planets and stars.  Thi
 s problem is currently of much interest in connection with extrasolar plan
 etary systems.  First\, I discuss properties of the linear response of a r
 otating barotropic fluid to low-frequency forcing by a tidal potential\, a
 nd I show that a robust frequency-averaged dissipation rate can be obtaine
 d through an appropriate impulse calculation.  Of particular interest is t
 he dependence of this quantity on the internal structure of the body. Seco
 nd\, I present analytical and numerical results on the frequency-dependent
  effective viscosity of convection and other fluid flows\, addressing the 
 controversial matter of the suppression of the effective viscosity for tid
 al periods that are short compared to the convective timescales.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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