Simulations of fluid motion in spheroidal planetary cores driven by latitudinal libration
文献类型：期刊论文
| 作者 | Chan, Kit H.1; Liao, Xinhao2 ; Zhang, Keke3
|
| 刊名 | PHYSICS OF THE EARTH AND PLANETARY INTERIORS
 |
| 出版日期 | 2011-08-01 |
| 卷号 | 187期号:3-4页码:404-415 |
| 关键词 | Planetary fluid cores Spheroid Latitudinal libration |
| 英文摘要 | The motion of a homogeneous viscous fluid confined in a latitudinally librating, oblate spheroidal cavity with arbitrary eccentricity gamma is investigated via direct three-dimensional numerical simulation using an EBE (Element-By-Element) finite element method. When the spheroidal cavity has moderate or large eccentricity with topographic coupling being dominant, an inviscid analytical solution describing the fluid motion driven by latitudinal libration is derived for the purpose of illustrating the nature of the fluid motion. It suggests that, in contrast to the fluid motion driven by longitudinal libration in ellipsoidal cavities, resonance of a spheroidal inertial wave mode with azimuthal wavenumber m = 1 can occur when the non-dimensional frequency of forced latitudinal libration is close to omega(resonance) = 2/(2 - gamma(2)), as predicted by the inviscid analytical solution. Three-dimensional direct numerical simulation at non-resonant frequencies, which includes the full effect of viscosity and nonlinearity, is carried out, showing a satisfactory agreement between the inviscid analytical solution and the numerical simulation. Emphasis of the numerical simulation is then placed on the strongly nonlinear librating flow at the exact resonance. The simulation reveals the existence of strong retrograde mean zonal flow due to nonlinear effects in the viscous boundary layer and different profiles of the zonal flow dependent upon the size of the libration frequency. Implications of the result for planetary evolution are also discussed. (C) 2011 Elsevier B.V. All rights reserved. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Geochemistry & Geophysics |
| 研究领域[WOS] | Geochemistry & Geophysics |
| 关键词[WOS] | ROTATING SPHERICAL CAVITY ; FINITE-ELEMENT-METHOD ; INERTIAL OSCILLATIONS ; FLOWS ; CONVECTION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000296207900028 |
| 公开日期 | 2014-10-29 |
| 源URL | [http://119.78.226.72//handle/331011/15356]  |
| 专题 | 上海天文台_行星科学重点实验室 |
| 作者单位 | 1.Univ Hong Kong, Dept Math, Pokfulam, Hong Kong, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Univ Exeter, Dept Math Sci, Exeter EX4 4QE, Devon, England |
| 推荐引用方式 GB/T 7714 | Chan, Kit H.,Liao, Xinhao,Zhang, Keke. Simulations of fluid motion in spheroidal planetary cores driven by latitudinal libration[J]. PHYSICS OF THE EARTH AND PLANETARY INTERIORS,2011,187(3-4):404-415. |
| APA | Chan, Kit H.,Liao, Xinhao,&Zhang, Keke.(2011).Simulations of fluid motion in spheroidal planetary cores driven by latitudinal libration.PHYSICS OF THE EARTH AND PLANETARY INTERIORS,187(3-4),404-415. |
| MLA | Chan, Kit H.,et al."Simulations of fluid motion in spheroidal planetary cores driven by latitudinal libration".PHYSICS OF THE EARTH AND PLANETARY INTERIORS 187.3-4(2011):404-415. |
入库方式： OAI收割
来源：上海天文台
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