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Lagrangian simulations of spray interaction with a surface using a stochastic multi-regime impingement model...

by Wenjun Ge, Vimal A Ramanuj, Ramanan Sankaran
Publication Type
Conference Paper
Journal Name
AIAA SciTech Forum
Book Title
AIAA Scitech 2020 Forum
Publication Date
Page Numbers
1 to 9
Conference Name
AIAA Scitech Forum 2020
Conference Location
Orlando, Florida, United States of America
Conference Sponsor
Lockheed Martin, Boeing, General Atomics Aeronautical, Northrop Grumman, Raytheon, DAR corporation, Bastion Technologies
Conference Date

Modeling of spray impingement upon the piston or cylinder surface is important for hydrocarbon emission and soot predictions in high-fidelity simulation of internal combustion engines with direct injections. Due to the complexity of the physical process of spray impingement, current computational models heavily rely on the empirical studies which involve large uncertainties. A computational model is presented for spray impingement on solid walls in general computational fluid dynamics (CFD) simulations. The model adopts the Marmanis-Thoroddsen theory for determining the number of secondary droplets and a stochastic method for calculating the velocities of the secondary droplets. The numerical methods and parallel implementation of the impingement model are presented in detail. The model is implemented in Grit, which is a recently developed CPU/GPU performance-portable Lagrangian particle library, for accelerating spray simulations. The model and its implementation are tested for examples of spray impingements on flat and smooth surfaces with different impingement angles.