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SUMMARY:When the driving pressure gradient is neither steady nor homogeneo
 us:  Baroclinicity and unsteadiness in wall bounded flows - Elie Bou-Zeid 
 (Princeton University)
DTSTART:20220401T080000Z
DTEND:20220401T083000Z
UID:TALK171221@talks.cam.ac.uk
DESCRIPTION:The overwhelming majority of studies of wall bounded turbulenc
 e examines steady and barotropic flows\; that is the pressure gradient dri
 ving the flow is (quasi) steady and does not vary with distance from the w
 all. These conditions are the rare exception in many real-world flows\, pa
 rticularly in geophysical settings. In this talk\, we focus on flows outsi
 de of this canonical framework using large-eddy simulations of wall-bounde
 d flow with time-varying (unsteady) or height-varying (baroclinic) pressur
 e forcings. For the unsteady ABL\, turbulence is found to be highly out of
  equilibrium with the mean flow when the forcing time scale ~ turbulence t
 ime scale\, suggesting a need for turbulence models with memory in such fl
 ows. For the baroclinic simulations\, the mean flow can also be well appro
 ximated using novel analytical solutions. However\, the resulting mean and
  turbulence profiles are strongly influenced by the strength and the direc
 tion of the baroclinicity\, and can have vast deviations from the canonica
 l log laws observed under barotropic conditions.
LOCATION:Seminar Room 1\, Newton Institute
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