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Univ. Paris-Saclay
A century of turbulent motion in fluids
C. P. Caulfield - BP Institute & DAMTP, University of Cambridge.
Mercredi 06/01/2016, 11:00
SPEC Salle Itzykson, Bât.774, Orme des Merisiers

In 1915, G. I. Taylor was awarded the Adams Prize at the University of Cambridge for an essay entitled 'Turbulent motion in fluids', which included, among many other brilliant contributions,  a  description of  observations made in direct response to the loss of the Titanic. In this talk, I will show how the key ideas of this 100-year-old essay remain absolutely central to modelling turbulent motions in stratified fluids  even today.  In particular, I will review the accumulating evidence that layering of the density stratification is ubiquitous, in that  a  vertical density distribution with multiple deep "layers" of relatively well-mixed fluid, separated by thin "interfaces" of substantially enhanced density gradient, is generic in geophysically relevant flows. In light of this evidence, I will highlight the truly impressive continued relevance of Taylor's  insights to recent advances in our understanding of transition, turbulence and mixing in shear flows of such layered fluids.


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