论文标题
边界层过渡的可见性分析
Visibility analysis of boundary layer transition
论文作者
论文摘要
我们通过对跨流域提取的速度时间序列的可见性分析来研究平板边界层中湍流的过渡。通过考虑采样值的相互可见性，可以从每个时间序列中构建可见性图。因此，后者被转变为几何对象，可以使用网络科学的典型度量来探索其主要特征，该措施提供了基础流属性的减少订单表示。使用这些指标，我们观察到从层流到湍流以及自由流湍流施加的影响的流动演变。与需要大量时空数据（例如，完整速度字段）或一组参数和阈值的其他方法不同，用户任意选择的参数和阈值，基于网络的方法能够单独通过流速度速度时间序列来识别过渡的起始标记。
We study the transition to turbulence in a flat plate boundary layer by means of visibility analysis of velocity time-series extracted across the flow domain. By taking into account the mutual visibility of sampled values, visibility graphs are constructed from each time series. The latter are, thus, transformed into a geometrical object, whose main features can be explored using measures typical of network science that provide a reduced order representation of the underlying flow properties. Using these metrics, we observe the evolution of the flow from laminarity to turbulence and the effects exerted by the free-stream turbulence. Different from other methods requiring an extensive amount of spatiotemporal data (e.g., full velocity field) or a set of parameters and thresholds arbitrarily chosen by the user, the present network-based approach is able to identify the onset markers for transition by means of the streamwise velocity time-series alone.
