Mécanique et mathématiques numériques en sciences géologiques
Potential enstrophy in stratified turbulence
Waite, Michael L.
University of Waterloo

Direct numerical simulations of potential enstrophy in strongly stratified, weakly rotating turbulence will be presented. When rotation and stratification are strong - as in large-scale atmospheric and oceanic flows - the potential vorticity is approximately linear in the flow variables, and so the potential enstrophy is a quadratic invariant. At smaller scales, however, the quadratic approximation becomes questionable. We will show that both quadratic and higher-order potential enstrophy are possible in this regime, depending on the effects of viscosity. As a result, laboratory and geophysical scale stratified turbulence have very different potential enstrophy dynamics.

Jeudi, 20 juin, 11h30
Salle Du Jardin