| DOI: | 10.1002/2014GL061434
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| 论文题名: | Tide-driven shear instability in planetary liquid cores |
| 作者: | Sauret A.; Le Bars M.; Le Gal P.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9806
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| EISSN: | 1944-9537
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| 出版年: | 2014
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| 卷: | 41, 期:17 | | 起始页码: | 6078
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| 结束页码: | 6083
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| 语种: | 英语
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| Scopus关键词: | Astronomy
; Stability
; Velocity measurement
; Axisymmetric jet
; Deformable spheres
; Particle image velocimetry measurement
; Planetary system
; Resonant forcing
; Self-interactions
; Semi-empirical
; Shear instability
; Liquids
; ellipse
; experimental study
; measurement method
; nonlinearity
; numerical model
; threshold
; tidal cycle
; turbulence
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| 英文摘要: | We present an experimental study on the shear instability driven by tidal forcing in a model planetary liquid core. The experimental setup consists of a water-filled deformable sphere rotating around its axis and subjected to an elliptical forcing. At resonant forcing frequencies, the nonlinear self-interaction of the excited inertial mode drives an intense and localized axisymmetric jet. The jet becomes unstable at low Ekman number because of a shear instability. Using particle image velocimetry measurements, we derive a semiempirical scaling law that captures the instability threshold of the shear instability. This mechanism is fully relevant to planetary systems, where it constitutes a new route to generate turbulence in their liquid cores. © 2014. American Geophysical Union. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84906800454&doi=10.1002%2f2014GL061434&partnerID=40&md5=1bd78bc8fad5d5d2b8d85ba81f8cc5b8
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7070
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Aix Marseille Université, CNRS, Centrale Marseill, Marseille, France
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| Recommended Citation: | |
Sauret A.,Le Bars M.,Le Gal P.. Tide-driven shear instability in planetary liquid cores[J]. Geophysical Research Letters,2014-01-01,41(17).
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