Numerical simulation of droplet impingement and flow around a cylinder using RANS and LES models

The paper is devoted to the numerical modeling of droplet impingement on a cylinder and droplet transport behind it at a Reynolds number of 1.6 x 10(4). The objectives are to investigate the ability of different turbulence models to predict the collision efficiency and the droplet distribution in the wake in order to rind the computationally most efficient way to achieve reliable results. The solutions of potential theory and four different RANS models are compared using the one obtained with Large Eddy Simulation as reference. The results show that the collision efficiency of the cylinder is predicted well by both potential theory and all considered RANS models for the given Reynolds number and droplet diameters of 13, 17, and 45 mu m. However, only the RNG k-epsilon model with enhanced wall treatment results in the droplet flow in the wake behind the cylinder being similar to the results obtained by LES. (C) 2014 Elsevier Ltd. All rights reserved.