论文标题
在实验室和数值湍流流中聚类
Clustering in laboratory and numerical turbulent swirling flows
论文作者
论文摘要
我们研究了速度停滞点的三维聚类，涡度和拉格朗日加速度的零值以及在固定雷诺数处的湍流中的惯性颗粒的三维聚类，但在固定的雷诺数下，但在不同的大尺度流量下。为此，我们将均质和各向同性湍流的直接数值模拟以及泰勒绿色的流量与vonKármán实验中的粒子跟踪速度计。尽管流动的拓扑不同（如零体簇不同），但在所有情况下，颗粒的行为都相似，表明泰勒级中性浮力颗粒簇簇为惯性颗粒。
We study the three-dimensional clustering of velocity stagnation points, of nulls of the vorticity and of the Lagrangian acceleration, and of inertial particles in turbulent flows at fixed Reynolds numbers, but under different large-scale flow geometries. To this end, we combine direct numerical simulations of homogeneous and isotropic turbulence and of the Taylor-Green flow, with particle tracking velocimetry in a von Kármán experiment. While flows have different topologies (as nulls cluster differently), particles behave similarly in all cases, indicating that Taylor-scale neutrally buoyant particles cluster as inertial particles.
