Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session L34: Geophysical Fluid Dynamics: Rotating Flows
4:05 PM–6:41 PM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B406
Chair: Philip Marcus, University of California, Berkeley
Abstract ID: BAPS.2018.DFD.L34.8
Abstract: L34.00008 : Effect of thermal stratification on the symmetry-breaking in a differentially-rotating spherical fluid shell
5:36 PM–5:49 PM
Presenter:
Taishi Inagaki
(Kansai Univ)
Authors:
Taishi Inagaki
(Kansai Univ)
Kohei Iida
(Kansai Univ)
Tomoaki Itano
(Kansai Univ)
Masako Sugihara-Seki
(Kansai Univ, Osaka Univ)
We consider the shear flow between double concentric spherical boundaries. Under the effect of rotation of the inner boundary (spherical Couette flow), the axisymmetric/non-axisymmetric transition from the trivial state is determined by the radius ratio β of the inner to outer spheres, which has been confirmed experimentally by Nakabayashi(2002) and Egbers(1995). With the comparison to previous studies, we have developed a direct numerical scheme to realize the spherical Couette flow under the weak effect of thermal stratification between the spherical boundaries, which has been unexplored. Here, restricting our attention to the case of non-axisymmetric transition (the radius ratio β>0.3), we numerically investigated the effect on the symmetry-breaking of the shear flow by the weak thermal stratification. In the non-rotating case, under the thermal effect a variety of states are bifurcated from the trivial conductive state at a critical Grashof number. We found that, at a relatively larger rotation number, the thermal effect reduces the transition Grashof number at which the (trivial) axisymmetric state bifurcates into a non-axisymmetric state. Our numerical results predict that axisymmetric states are realized only at less than a certain finite Grashof number.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.L34.8
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700