Action of coherent vortices in rotating duct flows

Yoshito Kaga, Shinichiro Yanase

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

In rotating duct flows, coherent longitudinal vortical structures develop even for very low Reynolds numbers due to the shear-Coriolis instability, where the mean absolute vorticity is close to zero. We investigate the creation mechanism of zero-mean-absolute-vorticity region focusing on the role of the longitudinal vortical structures for the plane-Poiseuille- and plane-Couette-type flows with the system rotation. It is found that the way of the vortex tubes to create zero-mean-absolute-vorticity state is different between the two cases. For the rotating plane-Poiseuille-type flow, the generated longitudinal vortex tubes develop the spanwise vorticity around them, whereas for the rotating plane-Couette-type flow, they enhance the spanwise vorticity inside them. However, it is common for the two cases that zero-mean-absolute-vorticity state is created by the action of the coherent longitudinal vortices in the anticyclonic region. 2006 Springer.

Original languageEnglish
Title of host publicationIUTAM Symposium on Elementary Vortices and Coherent Structures
Subtitle of host publicationSignificance in Turbulence Dynamicsa
EditorsSHIGEO KIDA
Pages225-231
Number of pages7
Publication statusPublished - Dec 1 2006

Publication series

NameFluid Mechanics and its Applications
Volume79
ISSN (Print)0926-5112

Keywords

  • Rotating fluid
  • Shear-coriolis instability
  • Zero-mean-absolute-vorticity state

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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  • Cite this

    Kaga, Y., & Yanase, S. (2006). Action of coherent vortices in rotating duct flows. In SHIGEO. KIDA (Ed.), IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence Dynamicsa (pp. 225-231). (Fluid Mechanics and its Applications; Vol. 79).