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 KP1: Poster Session (3:20-4:05pm)
Monday, November 19, 2018
Georgia World Congress Center Room: Level 1, Exhibit Hall B2 by the GFM videos
Abstract ID: BAPS.2018.DFD.KP1.116
Abstract: KP1.00116 : On the differential torque exerted on double concentric boundaries by in-between thermal convection*
(Kansai Univ., Osaka Univ.)
The modern seismic tomography measurements have elucidated that, lubricated by the liquid outer-core, the solid inner-core rotates slightly faster than the rest solid parts, the mantle and crust. The fluid motion in the outer-core, which is still veiled for us, possibly asymmetric with respect to east/westward circulations via the Coriolis effect, so that outer-core thermal convection may propagate to pro/retrograde directions, which was pointed out by Kimura et al [Phys. Fluids 23 074101 (2011)]. Here, we revisit a speculation on whether thermal convection induced between double concentric axisymmetric boundaries could allow them to permanently rotate with a difference in rotation rate. We consider a simple system of double concentric cylindrical boundaries freely rotating around their axis and Boussinesq fluid confined between them, which are initially co-rotating at an identical rotation rate. We argue a possibility that thermal convection generated with an increase of the difference in temperature of the boundaries produce a small difference in magnitude of the net tangential stress on the boundaries.
*We are grateful for the financial support in part by the Kansai University Subsidy for Supporting Young Scholars, 2017, and by ORDIST group fund at Kansai University.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.KP1.116
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