Effects of taylor-gortler vortices on near-wall coherent structures

Zixuan Yang, Bing Chen Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, direct numerical simulations (DNS) have been performed to investigate the superimposition and modulation effects of Taylor-Gortler (TG) vortices on near-wall coherent structures in the context of streamwise-rotating turbulent channel flow. The evolution and dynamic interaction of the TG vortices with near-wall streaks have been studied in both spectral and physical spaces. An interesting bimodal pattern is observed in the pre-multiplied energy spectra which effectively differentiates the characteristic length scales of near-wall streaks from those of TG vortices. In the physical space, it is discovered that the near-wall streaks are influenced by the superimposition effect of TG vortices, and vary quasi-periodically in the spanwise direction. It is also interesting to observe that with positive and negative superimposition effects of TG vortices, the intensity of streaks is enhanced and reduced, respectively, clearly revealing that TG vortices has an amplitude-modulation effect on the near-wall structures.

Original languageEnglish (US)
Title of host publication9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
PublisherTSFP-9
ISBN (Electronic)9780000000002
StatePublished - Jan 1 2015
Event9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 - Melbourne, Australia
Duration: Jun 30 2015Jul 3 2015

Publication series

Name9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
Volume2

Other

Other9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
CountryAustralia
CityMelbourne
Period6/30/157/3/15

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