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SUMMARY:Resolvent-inspired flow control of turbulent flows - Kunihiko Tair
 a (University of California\, Los Angeles)
DTSTART:20220401T110000Z
DTEND:20220401T113000Z
UID:TALK171236@talks.cam.ac.uk
DESCRIPTION:Resolvent analysis reveals the harmonic relations between the 
 forcing inputs and response outputs with respect to a base flow.&nbsp\; By
  combining our understanding of the baseline flow physics and the resolven
 t mode characteristics\, effective and efficient flow control strategies c
 an be developed to alter the time-average flows.&nbsp\; This approach prov
 ides us with a physics-driven flow control method\, without having to reso
 rt to expensive parametric computational and experimental studies. &nbsp\;
 We also discuss our recent efforts in extending the traditional resolvent 
 analysis to (1) incorporate randomized numerical linear algebra to enable 
 examining higher-Reynolds number turbulent flows\; (2) establish a sparsit
 y-promoting formulation to determine the optimal actuator location and the
  forcing variable\; and (3) integrate network broadcast analysis into the 
 resolvent formulation to study time-varying base flows.&nbsp\; In this tal
 k\, we demonstrate the use of these resolvent analysis techniques for exam
 ples of actively controlling turbulent separated flow over a NACA 0012 air
 foil\, high-speed open cavity flow\, and isotropic turbulence.&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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