标题： 摆动驱动的椭圆不稳定性 显示英文标题

标题： Libration driven elliptical instability

摘要： 椭圆不稳定性是一种普遍的不稳定性，出现在任何旋转流中，其流线被椭圆变形。 到目前为止，它在流体和椭圆畸变之间存在恒定非零差分旋转的情况下已被广泛研究，并应用于湍流、空气动力学、行星科学和天体物理学。 在本信中，我们扩展了以前的分析研究，并报告了椭圆不稳定性也可以由摆动驱动的首个数值和实验证据，即流体和椭圆畸变之间的差分旋转的周期性振荡，其平均值为零。 我们的结果表明，由于这种不稳定性产生的间歇性、充满空间的湍流可能存在于所谓同步行星和卫星的液态核心和表层海洋中。 显示英文摘要

摘要： The elliptical instability is a generic instability which takes place in any rotating flow whose streamlines are elliptically deformed. Up to now, it has been widely studied in the case of a constant, non-zero differential rotation between the fluid and the elliptical distortion with applications in turbulence, aeronautics, planetology and astrophysics. In this letter, we extend previous analytical studies and report the first numerical and experimental evidence that elliptical instability can also be driven by libration, i.e. periodic oscillations of the differential rotation between the fluid and the elliptical distortion, with a zero mean value. Our results suggest that intermittent, space-filling turbulence due to this instability can exist in the liquid cores and sub-surface oceans of so-called synchronized planets and moons.