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APPM Complex/Dynamical Systems Seminar - Benjamin Brown
Start Date: 5/4/2017Start Time: 2:00 PM
End Date: 5/4/2017End Time: 3:00 PM
This event recurs on Thursday every week until 5/4/2017.   Click here to see the series dates.
Event Description:
Benjamin Brown. CU APS and LASP <>

Convective heat transport and overshoot in stratified atmospheres: open science with the Dedalus framework.

Convection is an important heat transport mechanism in many astrophysical objects including our Sun; convective overshoot is an important non-local mixing and transport process in stars, extending the influence of turbulent stellar convection beyond the unstable portions of the atmosphere. In the solar dynamo, overshoot into the tachocline has been ascribed a role in the storage and organization of the global-scale magnetic fields. Here we consider two interrelated problems within fully compressible dynamics across convection zones with significant stratification. We conduct these studies using the Dedalus pseudospectral framework. The first study is heat transport by convection in stratified atmospheres. For a suitably defined Nusselt number, we find that compressible convection transports heat analogously to well known incompressible Rayleigh-Benard convection. The second study is a narrow consideration of the properties of convective overshoot across very stiff interfaces. We extend prior studies of overshoot substantially and find that the depth of overshoot in DNS simulations of a typical plume is well-predicted by a simple buoyancy equilibration model. The implications of this model, extended into the stellar regime, are that very little overshoot should occur under solar conditions. This would seem to sharply limit the role of the tachocline within the global solar dynamo.
Location Information:
Main Campus - Engineering Office Tower  (View Map)
1111 Engineering DR
Boulder, CO
Room: 226: Applied Math Conference Room
Contact Information:
Name: Ian Cunningham
Phone: 303-492-4668

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