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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Enhancement of coalescence in turbulent clouds
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Enhancement of coalescence in turbulent clouds

机译：APS-APS流体动力学分部第70届年会-事件-增强湍流云中的聚结

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An economical numerical model, called ClusColl, for droplet motions and collisions in turbulent flows has been developed, tested, and applied. In the linear eddy model, 1D turbulent advection of fluid is implemented by rearranging the fluid cells. Each permutation represents an individual turbulent eddy, and is called a ``triplet map." The triplet map captures flow processes as small as the smallest turbulent eddy, but the response of cloud droplets to turbulence has important features at scales as small as the droplet radius. ClusColl includes a 3D triplet map for droplets that captures these additional effects. We have also implemented a collision detection algorithm so that ClusColl can simulate collisions and coalescence between finite-inertia particles. For sedimenting droplets with St $<$ 1, there is fairly good agreement between collision kernels obtained from ClusColl and from direct numerical simulation. Collision and coalescence calculations made using ClusColl suggest that turbulence can significantly accelerate rain formation by droplet clustering and/or by spectral broadening due to entrainment and mixing. We are using ClusColl to investigate the relative roles that entrainment and mixing, droplet inertial effects, and ultragiant nuclei play in warm rain initiation.
机译：已经开发，测试和应用了一种经济的数值模型，称为ClusColl，用于液滴流和湍流中的碰撞。在线性涡流模型中，通过重新布置流体单元来实现流体的一维湍流对流。每个排列代表一个单独的湍流涡流，被称为“三重态图”。三重态图捕获的流量过程与最小的湍流涡流一样小，但是云滴对湍流的响应具有重要的特征，其尺度与液滴一样小ClusColl包括用于捕捉这些附加效果的液滴的3D三重态图;我们还实现了碰撞检测算法，以便ClusColl可以模拟有限惯性粒子之间的碰撞和聚结;对于沉积St $ <$ 1的液滴，有从ClusColl和直接数值模拟获得的碰撞核之间具有相当好的一致性，使用ClusColl进行的碰撞和合并计算表明，湍流可以通过液滴聚集和/或由于夹带和混合而引起的光谱展宽来显着加速降雨形成。研究夹带和混合，液滴惯性效应的相对作用，和超巨核在温暖的雨水开始时发挥作用。

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