Letter: The effects of streamwise system rotation on pressure fluctuations in a turbulent channel flow

Zixuan Yang, Bing Qing Deng, Bing Chen Wang, Lian Shen

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In this letter, we report the modulating effects of streamwise system rotation on both the amplitude and the wavenumber of pressure fluctuations in a plane channel flow. The analysis of the pressure field is conducted based on a set of comprehensive direct numerical simulation data of six rotation numbers. It is observed that high pressure fluctuation regions collocate with the Taylor-Görtler-like (TGL) vortex cores. By decomposing the pressure field into rotation-induced and convection-induced parts, it is observed that the rotation-induced part dominates the total pressure fluctuations and facilitates the growth of TGL vortices. Furthermore, through a spectral analysis, it is discovered that the system rotation acts as a "linear amplifier," which converts high-wavenumber low-amplitude streamwise vorticity fluctuations into low-wavenumber high-amplitude pressure fluctuations.

Original languageEnglish (US)
Article number091701
JournalPhysics of Fluids
Volume30
Issue number9
DOIs
StatePublished - Sep 1 2018

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channel flow
pressure distribution
vortices
linear amplifiers
direct numerical simulation
vorticity
spectrum analysis
convection

Cite this

Letter : The effects of streamwise system rotation on pressure fluctuations in a turbulent channel flow. / Yang, Zixuan; Deng, Bing Qing; Wang, Bing Chen; Shen, Lian.

In: Physics of Fluids, Vol. 30, No. 9, 091701, 01.09.2018.

Research output: Contribution to journalArticle

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