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SUMMARY:Nonlinear interaction of the self-sustaining process in the near-w
 all region of wall-bounded turbulence - Jane Bae\, Harvard University\, US
 A
DTSTART:20210611T150000Z
DTEND:20210611T153000Z
UID:TALK161017@talks.cam.ac.uk
CONTACT:Dr C. P.  Caulfield
DESCRIPTION:We investigate the nonlinear interaction in the self-sustainin
 g process of wall-bounded turbulence. Resolvent analysis is used to identi
 fy the principal forcing (nonlinear) mode which produces the maximum ampli
 fication in direct numerical simulations of the minimal channel for the bu
 ffer layer. The identified mode is then removed from the nonlinear term of
  the Navier-Stokes equations at each time step from a direct numerical sim
 ulation of a minimal channel. The results show that the removal of the pri
 ncipal forcing mode is able to inhibit turbulence in the buffer layer\, wh
 ile the removal of subsequent modes only marginally affects the flow. Anal
 ysis of the dyadic interactions in the nonlinear term shows that contribut
 ions toward the principal forcing mode come from a limited number of waven
 umber interactions. Using conditional averaging\, the flow structures that
  are responsible for generating the principal forcing mode\, and thus the 
 nonlinear interaction to self-sustain turbulence\, are identified to be sp
 anwise rolls interacting with meandering streaks.
LOCATION:GKB100  Fluid Mechanics Webinar Series via Zoom
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