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 |
|---|---|
| Title of host publication | Fluid Mechanics and its Applications |
| Pages | 225-231 |
| Number of pages | 7 |
| Volume | 79 |
| Publication status | Published - 2006 |
Publication series
| Name | Fluid Mechanics and its Applications |
|---|---|
| Volume | 79 |
| ISSN (Print) | 09265112 |
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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
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 proceeding › Chapter
}
TY - CHAP
T1 - Action of coherent vortices in rotating duct flows
AU - Kaga, Yoshito
AU - Yanase, Shinichiro
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
KW - Rotating fluid
KW - Shear-coriolis instability
KW - Zero-mean-absolute-vorticity state
UR - http://www.scopus.com/inward/record.url?scp=84859812876&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84859812876&partnerID=8YFLogxK
M3 - Chapter
AN - SCOPUS:84859812876
SN - 9781402041808
VL - 79
T3 - Fluid Mechanics and its Applications
SP - 225
EP - 231
BT - Fluid Mechanics and its Applications
ER -