On flow in weakly precessing cylinders: the general asymptotic solution
On flow in weakly precessing cylinders: the general asymptotic solution
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弱进动圆柱体中的流动:一般渐近解
DOI:
10.1017/jfm.2012.355
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发表时间:
2012-08
影响因子:
3.7
通讯作者:
Zhang, Keke
中科院分区:
文献类型:
--
作者:
Liao, Xinhao;Zhang, Keke
Abstract We investigate, through both asymptotic and numerical analysis, precessionally driven flow of a homogeneous fluid confined in a fluid-filled circular cylinder that rotates rapidly about its symmetry axis and precesses slowly about a different axis that is fixed in space. After demonstrating that the inviscid approximation is always divergent even far away from resonance, we derive a general asymptotic solution for an asymptotically small Ekman number in the rotating frame of reference describing the weakly precessing flow that satisfies the no-slip boundary condition and that is valid at or near or away from resonance. Numerical analysis of the same problem using the Galerkin method in terms of a Chebyshev polynomial expansion is also carried out, showing satisfactory agreement between the general asymptotic solution and the corresponding numerical solution at or near or away from resonance.
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