THEORETICAL AND NUMERICAL ANALYSES OF UNIFORM BLOWING AND SUCTION IN TURBULENT PLANE COUETTE FLOW

Yusuke Nabae, Koji Fukagata

Research output: Contribution to conferencePaperpeer-review

Abstract

We theoretically and numerically investigate the control effect of uniform blowing/suction (UB/US) in a turbulent plane Couette flow under a constant velocity difference (CVD) condition in terms of the net energy saving. The semi-theoretical upper bound of the ratio between UB/US amplitude and the wall velocity, Vw/Uw, for the net energy saving is about 0.45% at very low Reynolds numbers, i.e., Rew ∼ 103, while it is less than 0.05% at practically high Reynolds numbers, i.e., Rew ∼ 109-1010. According to the present simulations, however, it is found that the amplitude of Vw/Uw ≤ 0.1%, (i.e., the amplitude often used for external flows) is too small to obtain substantial control effects in this flow configuration, while the larger amplitude, i.e., Vw/Uw ≥ 0.3%, results in a negative net energy saving due to the drastic enhancement of the contribution from the blowing and suction.

Original languageEnglish
Publication statusPublished - 2022
Event12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022 - Osaka, Virtual, Japan
Duration: 2022 Jul 192022 Jul 22

Conference

Conference12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022
Country/TerritoryJapan
CityOsaka, Virtual
Period22/7/1922/7/22

ASJC Scopus subject areas

  • Aerospace Engineering
  • Atmospheric Science

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