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The validity of the kinetic collection equation revisited – Part 2: Simulations for the hydrodynamic kernel

机译:再谈动力学收集方程的有效性-第2部分:流体动力学核的仿真

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The kinetic collection equation (KCE) has been widely used to describe the evolution of the average droplet spectrum due to the collection process that leads to the development of precipitation in warm clouds. This deterministic, integro-differential equation only has analytic solution for very simple kernels. For more realistic kernels, the KCE needs to be integrated numerically. In this study, the validity time of the KCE for the hydrodynamic kernel is estimated by a direct comparison of Monte Carlo simulations with numerical solutions of the KCE. The simulation results show that when the largest droplet becomes separated from the smooth spectrum, the total mass calculated from the numerical solution of the KCE is not conserved and, thus, the KCE is no longer valid. This result confirms the fact that for kernels appropriate for precipitation development within warm clouds, the KCE can only be applied to the continuous portion of the mass distribution.
机译:由于收集过程导致了暖云中降水的发展,动力学收集方程(KCE)已被广泛用于描述平均液滴光谱的演变。这个确定性的积分微分方程仅对非常简单的内核具有解析解。对于更现实的内核,需要对KCE进行数字积分。在这项研究中,通过将蒙特卡罗模拟与KCE的数值解直接比较,可以估算出KCE在水动力内核中的有效时间。仿真结果表明,当最大的液滴与光滑光谱分离时,根据KCE数值解计算的总质量将不守恒,因此KCE不再有效。这一结果证实了这样一个事实,即对于适合于暖云内降水发展的籽粒而言,KCE只能应用于质量分布的连续部分。

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