Bulletin of the American Physical Society
74th Annual Meeting of the APS Division of Fluid Dynamics
Volume 66, Number 17
Sunday–Tuesday, November 21–23, 2021; Phoenix Convention Center, Phoenix, Arizona
Session T11: Astrophysical Fluid Dynamics
12:40 PM–3:03 PM,
Tuesday, November 23, 2021
Room: North 125 AB
Chair: Phil Marcus, University of California, Berkeley
Abstract: T11.00009 : The effects of a vertical magnetic field on Oscillatory Double-Diffusive Convection at low Prandtl number*
2:24 PM–2:37 PM
Presenter:
Amishi Sanghi
(University of California, Santa Cruz)
Authors:
Amishi Sanghi
(University of California, Santa Cruz)
Adrian E Fraser
(University of California, Santa Cruz)
Pascale Garaud
(University of California, Santa Cruz)
Oscillatory double diffusive convection (ODDC) is a process that takes place in a fluid that is stably stratified with respect to composition, but unstably stratified with respect to temperature. It has been well studied in the hydrodynamic limit at low Prandtl number, as it plays a potentially important role in stars. There, it is known to give rise to the formation of stacked convective layers, separated by thin interfaces. Here we analyze it in the presence of a vertical magnetic field. We find that the presence of a magnetic field decreases the kinetic energy in the turbulence after the saturation of the primary instability, and that this decrease is more pronounced with stronger magnetic fields. The compositional flux is correspondingly decreased. We also find that the magnetic field postpones the onset of layer formation, and in some cases, stops it entirely. This can be explained using the gamma instability theory of Radko, 2003. We conclude by discussing our findings with applications to mixing in stars.
*This work was funded by the National Science Foundation (NSF AST 1908338) and by the Other Worlds Laboratory at UC Santa Cruz.
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