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SUMMARY:Hydrodynamic instabilities of stratified-rotating shear flows   - 
 Junho Park (Coventry)
DTSTART:20230220T140000Z
DTEND:20230220T150000Z
UID:TALK197032@talks.cam.ac.uk
CONTACT:Zhao Guo
DESCRIPTION:Flow instability is a source of turbulence and thus it has bee
 n studied for more than a century by many researchers in fluid dynamics (i
 ncluding the seminal work by Taylor in 1923) and more broadly in physical 
 sciences to better understand turbulence in astrophysical and geophysical 
 flows. To understand these naturally occurring large-scale flows where str
 atification and rotation play important roles\, my research has focused on
  instabilities of shear flows in stratified and rotating fluids. In the se
 minar\, I will give a talk about two topics. The first one will be about s
 tably stratified Taylor-Couette flow and its two different instabilities: 
 centrifugal and strato-rotational instabilities. The topic is found to hav
 e some relevance with equatorial flows in the Earth's ocean and atmosphere
  as well as the equatorial tachocline. Theoretical and experimental result
 s will be presented to explain the instability mechanism and demonstrate n
 onlinear development of the instabilities leading to turbulence. The secon
 d topic will be about horizontal and vertical shear flows in stellar radia
 tion zones where stably stratified. More specifically\, I will discuss the
  effects of (i) fast thermal diffusion in the radiation zones and (ii) rot
 ation with the full Coriolis acceleration. I will also discuss briefly how
  research outcomes on the instability can be used for turbulence modelling
  in stellar evolution simulations.  
LOCATION:Streaming online and in MR14
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