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 publicationFluid Mechanics and its Applications
Pages225-231
Number of pages7
Volume79
Publication statusPublished - 2006

Publication series

NameFluid Mechanics and its Applications
Volume79
ISSN (Print)09265112

Fingerprint

Vorticity
Ducts
Vortex flow
Reynolds number

Keywords

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

ASJC Scopus subject areas

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

Cite this

Kaga, Y., & Yanase, S. (2006). Action of coherent vortices in rotating duct flows. In Fluid Mechanics and its Applications (Vol. 79, pp. 225-231). (Fluid Mechanics and its Applications; Vol. 79).

Action of coherent vortices in rotating duct flows. / Kaga, Yoshito; Yanase, Shinichiro.

Fluid Mechanics and its Applications. Vol. 79 2006. p. 225-231 (Fluid Mechanics and its Applications; Vol. 79).

Research output: Chapter in Book/Report/Conference proceedingChapter

Kaga, Y & Yanase, S 2006, Action of coherent vortices in rotating duct flows. in Fluid Mechanics and its Applications. vol. 79, Fluid Mechanics and its Applications, vol. 79, pp. 225-231.
Kaga Y, Yanase S. Action of coherent vortices in rotating duct flows. In Fluid Mechanics and its Applications. Vol. 79. 2006. p. 225-231. (Fluid Mechanics and its Applications).
Kaga, Yoshito ; Yanase, Shinichiro. / Action of coherent vortices in rotating duct flows. Fluid Mechanics and its Applications. Vol. 79 2006. pp. 225-231 (Fluid Mechanics and its Applications).
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