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A multiphase SPH framework for supercooled large droplets dynamics

机译：用于过冷大液滴动力学的多相SPH框架

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摘要

Purpose This paper aims to introduce a three-dimensional smoothed particle hydrodynamics (SPH) framework for simulating supercooled large droplets (SLD) dynamics at aeronautical speeds. Design/methodology/approach To include the effects of the surrounding air, a multiphase model capable of handling high density-ratio problems is adopted. A diffusive term is incorporated to smooth the density field and avoid numerical instabilities. Additionally, a particle shifting technique is used to eliminate anisotropic particle distributions. Findings The framework is validated against low-speed droplet impingement experimental results and then applied to the droplet impingement at high speeds typical of SLD conditions. Preliminary parametric studies are conducted to investigate the post-impact splashing. It is observed that a thicker water film can decrease the crown diameter and a smaller impact angle can suppress upward and forward splashing. Originality/value A three-dimensional multiphase SPH framework for SLD dynamics at a wide range of impact speed is developed and validated. The effects of particle resolution, water film thickness and impact angle on the post-impact crown evolution are investigated.
机译：目的本文旨在介绍一个三维平滑粒子流体动力学（SPH）框架，用于模拟航空速度下的过冷大液滴（SLD）动力学。设计/方法/方法为了包含周围空气的影响，采用了能够处理高密度比问题的多相模型。并入了一个扩散项，以使密度场平滑并避免数值不稳定性。另外，使用粒子移动技术来消除各向异性的粒子分布。结果针对低速液滴撞击实验结果验证了该框架，然后将其应用于SLD条件下典型的高速液滴撞击。进行了初步的参数研究，以研究撞击后的飞溅。观察到，较厚的水膜可减小胎冠直径，较小的冲击角可抑制向上和向前飞溅。独创性/价值开发并验证了在多种冲击速度下用于SLD动力学的三维多相SPH框架。研究了颗粒分辨率，水膜厚度和冲击角对冲击后冠演变的影响。

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