대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제26권2호
  • /
  • Pages.345-352
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  • 2002
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  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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원관내 유동에서의 준최적 제어의 평가

Assessment of Suboptimal Control in Turbulent Pipe Flow

  • 최정일 (한국과학기술원 기계공학과) ;
  • ;
  • 성형진 (한국과학기술원 기계공학과)
  • Choe, Jeong-Il (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Xu, C.X. (Dept. of Eng, Mech., Tsinghua Univ. CHINA) ;
  • Seong, Hyeong-Jin (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
  • 발행 : 2002.02.01
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초록

A suboptimal control law in turbulent pipe flow is derived and tested. Two sensing variables ∂p/∂$\theta$│$\_$w/ and ∂v$\_$$\theta$/∂γ│$\_$w/ are applied with two actuations ø$\_$$\theta$/ and ø$\_$γ/. To test the suboptimal control law, direct numerical simulations of turbulent pipe flow at Re$\_$$\tau$/=150 are performed. When the control law is applied, a 13∼23% drag reduction is achieved. The most effective drag reduction is made at the pair of ∂v$\_$$\theta$/∂γ│$\_$w/ and ø$\_$γ/. An impenetrable virtual wall concept is useful for analyzing the near-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.

키워드

참고문헌

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