Turbulent Friction Drag Reduction: From Feedback to Predetermined, and Feedback Again

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We overview the recent attempts for turbulent friction drag reduction and related studies, by focusing on those conducted in our research group. While the earlier studies for friction drag reduction mainly targeted at suppression of quasi-streamwise vortices using feedback control, predetermined control methods using streamwise traveling waves or a uniform blowing have also been extensively investigated in the last decade. For both the streamwise traveling wave of wall deformation and the uniform blowing, their drag reduction capabilities have been confirmed well by direct numerical simulation at relatively low Reynolds numbers. Prediction of their drag reduction capabilities at higher Reynolds numbers and attempts for experimental confirmation are also intensively ongoing toward their practical implementation. We also introduce our practice on the application of resolvent analysis for designing a more effective feedback control law. In addition, we briefly introduce some recent attempts on the applications of machine learning to turbulent flows, which may be utilized for a better design of flow control in future.

Original languageEnglish
Title of host publicationFluid-Structure-Sound Interactions and Control - Proceedings of the 5th Symposium on Fluid-Structure-Sound Interactions and Control
EditorsMarianna Braza, Yannick Hoarau, Yu Zhou, Anthony D. Lucey, Lixi Huang, Georgios E. Stavroulakis
PublisherSpringer Science and Business Media Deutschland GmbH
Number of pages10
ISBN (Print)9789813349599
Publication statusPublished - 2021
Event5th Symposium on Fluid-Structure-Sound Interactions and Control, FSSIC 2019 - Chania, Greece
Duration: 2019 Aug 272019 Aug 30

Publication series

NameLecture Notes in Mechanical Engineering
ISSN (Print)2195-4356
ISSN (Electronic)2195-4364


Conference5th Symposium on Fluid-Structure-Sound Interactions and Control, FSSIC 2019


  • Drag reduction
  • Flow control
  • Turbulent flow

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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