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SUMMARY:Too much of a good thing?  Bounds on stratified mixing - Dr Colm C
 aulfield\, BP Institute
DTSTART:20090122T133000Z
DTEND:20090122T143000Z
UID:TALK16378@talks.cam.ac.uk
CONTACT:8442
DESCRIPTION:Parameterizing the mixing of a stratified fluid is a fundament
 al challenge\nfor models of environmental and industrial flows.\nIn partic
 ular\, it is of great value to parameterize the efficiency of\nturbulent m
 ixing\, in the sense of the proportion of the kinetic energy\nconverted in
 to potential energy (through irreversible mixing of fluid of\nvarying dens
 ity) compared to the total amount of energy converted into\npotential ener
 gy and internal energy (through irreversible viscous\ndissipation).\nIn th
 is talk I review experimental\, numerical and observational evidence\nwhic
 h has lead to the development of various competing models for the\ndepende
 nce of mixing on the overall stratification. In an attempt to\nreconcile t
 he differences between these models and measurements\, I present a\nnovel 
 theoretical approach based around generating rigorous bounds on the\nmixin
 g rate through imposing various reasonable physical constraints in a\nmode
 l (though applicable) variational problem.
LOCATION:Lecture Room 6\, Engineering Department
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