Pascale Garaud
University of California Santa Cruz
Seminar Information
Engineering Building Unit 2 (EBU2)
Room 479
Seminar Recording Available: Please contact seminar coordinator, Jake Blair at (j1blair@eng.ucsd.edu)
Turbulence is known to cause vertical (diapycnal) mixing in strongly stratified regions of the oceans and the stars. An important question is therefore to model how much mixing can be expected given known large-scale properties of these bodies of fluid, such as the Reynold and Froude numbers of the large-scale flows, as well as the Prandtl number of the fluid itself. This knowledge will ultimately help create subgrid scale parametrizations for mixing that can be used in global ocean or stellar evolution models. In this talk I will describe recent progress in creating such parametrizations using formal multiscale asymptotic models and large-scale DNS. I will contrast the properties of the turbulence expected in the oceanographic and astrophysical cases, and show that the main differences between the two arise from the size of the Prandtl number, which is O(1) in the ocean, but asymptotically small in stars.
Garaud is an expert in Astrophysical Fluid Dynamics and to a lesser extent, Geophysical Fluid Dynamics, which she studies using both analytical methods and computational methods.
"I completed my undergraduate studies in Mathematics and Physics at the University Louis Pasteur in Strasbourg, in 1996. I then decided to study abroad for a year and was awarded a Knox Scholarship by Trinity College to take part in the gruelling Part III of the Mathematical Tripos in Cambridge (UK).
I chose to stay in Cambridge for my PhD, and was awarded an Isaac Newton Studentship to study "The dynamics of the solar tachocline" with Prof. D. O. Gough (Institute of Astronomy, Cambridge) and Prof. N. O. Weiss (Department of Applied Mathematics and Theoretical Physics, Cambridge). I completed my PhD in 2001, and stayed in Cambridge for my post-doc for another 4 years, funded by fellowships from New Hall (now Murray-Edwards college) and the Particle Physics and Astrophysics Research Council (PPARC). During my PPARC fellowship I had the opportunity to apply for a position at UCSC, and was delighted to be offered the job.
Since arriving at UCSC in 2004, I was awarded an NSF CAREER grant to study the evolution of magnetized stars. I was tenured in 2010, and became a Full Professor in 2012. See my Publication Page for a list of my papers."