Vorticity transports in turbulent channels under large-scale control via spanwise wall jet forcing

Yong Ji, Jie Yao, Fazle Hussain, Xi Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Vorticity transport in turbulent channels under large-scale active drag control (i.e., spanwise opposed jet forcing) is investigated via direct numerical simulation of the Navier-Stokes equation. The skin-friction coefficient is newly expressed by the volume integration average of the mean flow dissipation expressed in terms of the spanwise vorticity (Ωz), and the turbulent transports of the spanwsie vorticity fluctuation are negatively correlated in the entire region. The analysis here suggests that the suppression of random spanwise-vorticity transport is the target for more effective drag reduction under the current method.

Original languageEnglish
Article number095112
JournalPhysics of Fluids
Volume33
Issue number9
DOIs
StatePublished - Sep 1 2021

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