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

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

Research output: Contribution to journalArticlepeer-review

15 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

Publisher Copyright:
© 2018 Author(s).

Fingerprint

Dive into the research topics of 'Letter: The effects of streamwise system rotation on pressure fluctuations in a turbulent channel flow'. Together they form a unique fingerprint.

Cite this