论文标题
通过空间周期性强迫快速旋转的雷利 - 贝纳德对流进行模式选择和受限的涡旋动力学
Pattern selection and restricted vortex dynamics by spatial periodic forcing in rapidly rotating Rayleigh-Bénard convection
论文作者
论文摘要
用外部施加的对称性形成的模式本质上是无处不在的，但对模式进行了研究。我们目前对图案形成和选择的实验研究，通过在迅速旋转的对流中进行空间周期性强迫进行选择。当外部强迫的周期性接近固有的涡旋间距时，我们以常规涡流晶格的形式观察到对称对流模式。我们表明，新模式是一种不完善分叉的动态过程，可以通过像Ginzburg-Landau样模型对其进行很好的描述。随着浮力的增加，外部强迫的影响会减弱，对流涡流从固定状态演变为表现出受限制和最终随机运动。
Pattern forming with externally imposed symmetry is ubiquitous in nature but lightly studied.We present experimental studies of pattern formation and selection by spatial periodic forcing in rapidly rotating convection. We observe symmetric convection patterns in form of regular vortex lattice near the instability onset, when the periodicity of the external forcing is set close to the intrinsic vortex spacing. We show that the new patterns arise as a dynamical process of imperfect bifurcation which can be well described by a Ginzburg-Landau-like model. With increasing buoyancy strength the effect of external forcing weakens, and the convective vortices evolve from a stationary state to exhibit restricted and finally stochastic motions.
