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

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7 Scopus citations

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

Bibliographical note

Funding Information:
The authors would like to thank the Western Canada Research Grid (WestGrid) for providing access to supercomputing and storage facilities. Research funding from the Natural Sciences and Engineering Research Council (NSERC) of Canada to B.-C. Wang is gratefully acknowledged.

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