Drag reduction in turbulent pipe flow with feedback control applied partially to wall

Koji Fukagata, Nobuhide Kasagi

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Turbulent pipe flow controlled by the opposition control algorithm [J. Fluid Mech. 262 (1994) 75-110] is studied by means of direct numerical simulation. A special focus is laid upon a scheme in which the control input is applied only partially over a limited length in the streamwise direction, but not on the entire wall surface. The upstream control effect remains over a distance of about 11-14 times the pipe radius downstream of the point where the control is terminated. This results, however, in a simple relationship that the average drag reduction rate is nearly proportional to the control length. The recovery process after the control termination is quantitatively investigated by applying a recently proposed exact relation between the skin friction and the Reynolds stress distribution [Phys. Fluids 14 (11) (2002) L73-L76] and also by performing a budget analysis specially designed for that purpose.

Original languageEnglish
Pages (from-to)480-490
Number of pages11
JournalInternational Journal of Heat and Fluid Flow
Volume24
Issue number4
DOIs
Publication statusPublished - 2003 Aug
Externally publishedYes

Fingerprint

drag reduction
pipe flow
Drag reduction
Pipe flow
feedback control
Feedback control
Fluids
Skin friction
Direct numerical simulation
skin friction
fluids
Reynolds stress
Stress concentration
direct numerical simulation
budgets
upstream
stress distribution
Pipe
Recovery
recovery

Keywords

  • Control
  • Direct numerical simulation
  • Drag reduction
  • Opposition control
  • Partial control
  • Pipe flow
  • Reynolds stress budget
  • Turbulence

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

Cite this

Drag reduction in turbulent pipe flow with feedback control applied partially to wall. / Fukagata, Koji; Kasagi, Nobuhide.

In: International Journal of Heat and Fluid Flow, Vol. 24, No. 4, 08.2003, p. 480-490.

Research output: Contribution to journalArticle

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