TY - CHAP
T1 - Action of coherent vortices in rotating duct flows
AU - Kaga, Yoshito
AU - Yanase, Shinichiro
PY - 2006/12/1
Y1 - 2006/12/1
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
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M3 - Chapter
AN - SCOPUS:84859812876
SN - 9781402041808
T3 - Fluid Mechanics and its Applications
SP - 225
EP - 231
BT - IUTAM Symposium on Elementary Vortices and Coherent Structures
A2 - KIDA, SHIGEO
ER -