Suboptimal control for drag reduction in turbulent pipe flow

Chun Xiao Xu, Jung Il Choi, Hyung Jin Sung

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A suboptimal control law in turbulent pipe flow is derived and tested. Two sensing variables ∂ p/∂χ-w and ∂υo/∂w are applied with two actuations ∅o and ∅r. To test the suboptimal control law, direct numerical simulations of turbulent pipe flow at Reτ = 150 are performed. When the control law is applied, a 13-23% drag reduction is achieved. The most effective drag reduction is made at the pair of ∂υo/∂r-w and ∅r. An impenetrable virtual wall is observed by the controlled wall suction and blowing. The virtual wall concept is useful for analyzing the near-wall behavior of the controlled flow. Comparison of the present suboptimal control with that of turbulent channel flow reveals that the curvature effect is insignificant.

Original languageEnglish
Article number638
Pages (from-to)217-231
Number of pages15
JournalFluid Dynamics Research
Volume30
Issue number4
DOIs
Publication statusPublished - 2002 Jan 1

Fingerprint

drag reduction
pipe flow
Drag reduction
Pipe flow
blowing
Direct numerical simulation
suction
channel flow
Channel flow
Blow molding
direct numerical simulation
actuation
curvature

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

Xu, Chun Xiao ; Choi, Jung Il ; Sung, Hyung Jin. / Suboptimal control for drag reduction in turbulent pipe flow. In: Fluid Dynamics Research. 2002 ; Vol. 30, No. 4. pp. 217-231.
@article{e8936a6fe87d4875a52ebff53d395c7c,
title = "Suboptimal control for drag reduction in turbulent pipe flow",
abstract = "A suboptimal control law in turbulent pipe flow is derived and tested. Two sensing variables ∂ p/∂χ-w and ∂υo/∂w are applied with two actuations ∅o and ∅r. To test the suboptimal control law, direct numerical simulations of turbulent pipe flow at Reτ = 150 are performed. When the control law is applied, a 13-23{\%} drag reduction is achieved. The most effective drag reduction is made at the pair of ∂υo/∂r-w and ∅r. An impenetrable virtual wall is observed by the controlled wall suction and blowing. The virtual wall concept is useful for analyzing the near-wall behavior of the controlled flow. Comparison of the present suboptimal control with that of turbulent channel flow reveals that the curvature effect is insignificant.",
author = "Xu, {Chun Xiao} and Choi, {Jung Il} and Sung, {Hyung Jin}",
year = "2002",
month = "1",
day = "1",
doi = "10.1016/S0169-5983(02)00041-2",
language = "English",
volume = "30",
pages = "217--231",
journal = "Fluid Dynamics Research",
issn = "0169-5983",
publisher = "IOP Publishing Ltd.",
number = "4",

}

Suboptimal control for drag reduction in turbulent pipe flow. / Xu, Chun Xiao; Choi, Jung Il; Sung, Hyung Jin.

In: Fluid Dynamics Research, Vol. 30, No. 4, 638, 01.01.2002, p. 217-231.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Suboptimal control for drag reduction in turbulent pipe flow

AU - Xu, Chun Xiao

AU - Choi, Jung Il

AU - Sung, Hyung Jin

PY - 2002/1/1

Y1 - 2002/1/1

N2 - A suboptimal control law in turbulent pipe flow is derived and tested. Two sensing variables ∂ p/∂χ-w and ∂υo/∂w are applied with two actuations ∅o and ∅r. To test the suboptimal control law, direct numerical simulations of turbulent pipe flow at Reτ = 150 are performed. When the control law is applied, a 13-23% drag reduction is achieved. The most effective drag reduction is made at the pair of ∂υo/∂r-w and ∅r. An impenetrable virtual wall is observed by the controlled wall suction and blowing. The virtual wall concept is useful for analyzing the near-wall behavior of the controlled flow. Comparison of the present suboptimal control with that of turbulent channel flow reveals that the curvature effect is insignificant.

AB - A suboptimal control law in turbulent pipe flow is derived and tested. Two sensing variables ∂ p/∂χ-w and ∂υo/∂w are applied with two actuations ∅o and ∅r. To test the suboptimal control law, direct numerical simulations of turbulent pipe flow at Reτ = 150 are performed. When the control law is applied, a 13-23% drag reduction is achieved. The most effective drag reduction is made at the pair of ∂υo/∂r-w and ∅r. An impenetrable virtual wall is observed by the controlled wall suction and blowing. The virtual wall concept is useful for analyzing the near-wall behavior of the controlled flow. Comparison of the present suboptimal control with that of turbulent channel flow reveals that the curvature effect is insignificant.

UR - http://www.scopus.com/inward/record.url?scp=0036542254&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036542254&partnerID=8YFLogxK

U2 - 10.1016/S0169-5983(02)00041-2

DO - 10.1016/S0169-5983(02)00041-2

M3 - Article

AN - SCOPUS:0036542254

VL - 30

SP - 217

EP - 231

JO - Fluid Dynamics Research

JF - Fluid Dynamics Research

SN - 0169-5983

IS - 4

M1 - 638

ER -