### 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 language | English |
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Title of host publication | IUTAM Symposium on Elementary Vortices and Coherent Structures |

Subtitle of host publication | Significance in Turbulence Dynamicsa |

Editors | SHIGEO KIDA |

Pages | 225-231 |

Number of pages | 7 |

Publication status | Published - Dec 1 2006 |

### Publication series

Name | Fluid Mechanics and its Applications |
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Volume | 79 |

ISSN (Print) | 0926-5112 |

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### 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

### Cite this

*IUTAM Symposium on Elementary Vortices and Coherent Structures: Significance in Turbulence Dynamicsa*(pp. 225-231). (Fluid Mechanics and its Applications; Vol. 79).