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SUMMARY:Nonlinear interaction of the self-sustaining process in the near-w
 all region of wall-bounded turbulence - Jane Bae (CALTECH (California Inst
 itute of Technology))
DTSTART:20220331T080000Z
DTEND:20220331T083000Z
UID:TALK171191@talks.cam.ac.uk
DESCRIPTION:We investigate the nonlinear interaction in the self-sustainin
 g process of wall-bounded turbulence.&nbsp\;Resolvent analysis is used to 
 identify the principal&nbsp\;forcing (nonlinear) mode which produces the m
 aximum&nbsp\;amplification in direct numerical simulations of the minimal 
 channel for the buffer layer. The identified mode is then&nbsp\;removed fr
 om the nonlinear term of the Navier-Stokes equations at each time step fro
 m a direct numerical simulation of a minimal channel.&nbsp\;The results sh
 ow that the removal of the principal forcing mode is able to inhibit turbu
 lence in the buffer layer\, while the removal of subsequent modes&nbsp\;on
 ly marginally affects the flow.&nbsp\;Analysis of the dyadic interactions 
 in the nonlinear&nbsp\;term shows that contributions toward the principal 
 forcing mode come from a&nbsp\;limited&nbsp\;number of wavenumber interact
 ions.&nbsp\;Using conditional averaging\, the flow structures that are res
 ponsible for generating the principal forcing mode\, and&nbsp\;thus the no
 nlinear interaction to self-sustain turbulence\, are identified to be span
 wise rolls interacting with meandering streaks.
LOCATION:Seminar Room 1\, Newton Institute
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