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SUMMARY:Dissipation\, rotation\, and other missing elements in mixing leng
 th theory - Laura Currie (Exeter)
DTSTART:20170313T160000Z
DTEND:20170313T170000Z
UID:TALK69443@talks.cam.ac.uk
CONTACT:Robert Teed
DESCRIPTION:Standard evolutionary (one-dimensional) models of stellar inte
 riors rely on mixing length theory (MLT) to describe heat transport by con
 vection. As such\, these models typically do not explicitly account for di
 ssipative heating (by processes such as viscous or ohmic heating) or rotat
 ion. In this talk I will present theoretical and numerical results from si
 mple two and three dimensional models that give some insight into the effe
 cts of dissipation and rotation on convection -- effects which may ultimat
 ely influence the behaviour of many astrophysical bodies. In the first par
 t I will discuss the magnitude of dissipative heating in a stratified conv
 ecting fluid\, and in particular will examine how the heating in simulatio
 ns of a convective\, anelastic gas compares to theoretical estimates first
  presented by Hewitt et al. (1975). In the second part of this talk I will
  consider a simple Cartesian\, Boussinesq model of rotating convection and
  present physical arguments of a rotating MLT akin to those first proposed
  by Stevenson (1979) and more recently by Barker et al. (2014). I will the
 n focus on an extension of this theory to consider cases where rotation is
  oblique to gravity\, representative of mid-latitudes on a spherical body\
 , and discuss the resulting complications for rotating MLT that arise here
 .
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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