A multiphase SPH framework for supercooled large droplets dynamics

Xiangda Cui (Department of Mechanical Engineering, CFD Laboratory, McGill University, Montreal, Canada)
Ahmed Bakkar (Department of Mechanical Engineering, CFD Laboratory, McGill University, Montreal, Canada)
Wagdi George Habashi (Department of Mechanical Engineering, CFD Laboratory, McGill University, Montreal, Canada)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Publication date: 19 June 2019

Abstract

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.

Keywords

Citation

Cui, X., Bakkar, A. and Habashi, W. (2019), "A multiphase SPH framework for supercooled large droplets dynamics", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/HFF-10-2018-0547

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Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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