THEORETICAL STUDIES ON FRICTION DRAG REDUCTION CONTROL WITH THE AID OF DIRECT NUMERICAL SIMULATION - A REVIEW

  • Fukagata, Koji (Department of Mechanical Engineering, Keio University)
  • Published : 2008.12.31

Abstract

We review a series of studies on turbulent skin friction drag reduction in wall-turbulence recently conducted in Japan. First, an identity equation relating the skin friction drag and the Reynolds shearstress (the FIK identity) is introduced. Based on the implication of the FIK identity, a new analytical suboptimal feedback control law requiring the streamwise wall-shear stress only is introduced and direct numerical simulation (DNS) results of turbulent pipe flow with that control is reported. We also introduce DNS of an anisotropic compliant surface and parameter optimization using an evolutionary optimization technique.

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