Pascale Garaud is an applied mathematician and astrophysicist whose work connects fluid dynamics, turbulence and the evolution of stars. Her institutional biography identifies research on stellar flows, magnetohydrodynamics and double-diffusive convection, using both analytical and computational methods.[ref]
https://campusdirectory.ucsc.edu/cd_detail?uid=pgaraud. UC Santa Cruz, Pascale Garaud, biography and research interests
With collaborators, she developed a model for mixing by fingering convection and tested it against three-dimensional direct numerical simulations. A stellar layer can resist ordinary overturning while still mixing because heat and composition diffuse at different rates. Predicting the resulting transport matters when a one-dimensional stellar calculation cannot resolve the individual turbulent motions.[ref]
Chemical Transport and Spontaneous Layer Formation in Fingering Convection in Astrophysics by Justin M. Brown and others. Abstract: theory, simulation support and implementation in stellar codes
Her lecture notes explain how competing thermal and compositional density effects lead to double-diffusive convection. The connection is scientifically useful: a process familiar from salt water becomes relevant to material redistribution inside stars, with very different diffusivity ratios.[ref]
Double-diffusive processes in stellar astrophysics by Pascale Garaud. Section 2.2.1, linear fingering instability and density-ratio interval
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