Effect of fast rotation on pressure fluctuations and Taylor–Görtler-like vortices in channel flows

Zixuan Yang, Bing Qing Deng, Bing Chen Wang

Research output: Contribution to conferencePaper

Abstract

In this paper, the pressure field is decomposed into rotation-induced and convection-induced components to analyze the effects of streamwise system rotation on the pressure fluctuations and the transport of Reynolds stresses. We show analytically 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, and facilitates the growth of streamwise-elongated Taylor–Görtler-like (TGL) vortices. A new set of transport equations in the spectral space is derived to study the budget balance of velocity-spectrum tensor at different wavelengths. The mechanisms underlying the generation of TGL vortices are explained through the analyses of the budget balance of Reynolds stresses and energy spectra.

Original languageEnglish (US)
StatePublished - Jan 1 2019
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
Duration: Jul 30 2019Aug 2 2019

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
CountryUnited Kingdom
CitySouthampton
Period7/30/198/2/19

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Yang, Z., Deng, B. Q., & Wang, B. C. (2019). Effect of fast rotation on pressure fluctuations and Taylor–Görtler-like vortices in channel flows. Paper presented at 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019, Southampton, United Kingdom.