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Titolo:
Application of reduced-order controller to turbulent flows for drag reduction
Autore:
Lee, KH; Cortelezzi, L; Kim, J; Speyer, J;
Indirizzi:
Univ Calif Los Angeles, Dept Mech & Aerosp Engn, Los Angeles, CA 90095 USAUniv Calif Los Angeles Los Angeles CA USA 90095 Los Angeles, CA 90095 USA
Titolo Testata:
PHYSICS OF FLUIDS
fascicolo: 5, volume: 13, anno: 2001,
pagine: 1321 - 1330
SICI:
1070-6631(200105)13:5<1321:AORCTT>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
BOUNDARY-LAYER CONTROL; FEEDBACK-CONTROL; POISEUILLE FLOW; CHANNEL FLOW;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, J Univ Calif Los Angeles, Dept Mech & Aerosp Engn, Los Angeles, CA 90095 USA Univ Calif Los Angeles Los Angeles CA USA 90095 eles, CA 90095 USA
Citazione:
K.H. Lee et al., "Application of reduced-order controller to turbulent flows for drag reduction", PHYS FLUIDS, 13(5), 2001, pp. 1321-1330

Abstract

A reduced-order linear feedback controller is designed and applied to turbulent channel flow for drag reduction. From the linearized two-dimensional Navier-Stokes equations a distributed feedback controller, which produces blowing/suction at the wall based on the measured turbulent streamwise wall-shear stress, is derived using model reduction techniques and linearquadratic-Gaussian/loop-transfer-recovery control synthesis. The quadratic cost criterion used for synthesis is composed of the streamwise wall-shear stress,which includes the control effort of blowing/suction. This distributed two-dimensional controller developed from a linear system theory is shown to reduce the skin friction by 10% in direct numerical simulations of a low-Reynolds number turbulent nonlinear channel flow. Spanwise shear-stress variation, not captured by the distributed two-dimensional controller, is suppressed by augmentation of a simple spanwise ad hoc control scheme. This augmented three-dimensional controller, which requires only the turbulent streamwise velocity gradient, results in a further reduction in the skin-friction drag. It is shown that the input power requirement is significantly less than the power saved by reduced drag. Other turbulence characteristics affected by these controllers are also discussed. (C) 2001 American Institute of Physics.

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Documento generato il 05/04/20 alle ore 19:35:28