@inproceedings{dbcec6f8eecf4815b9d5066bc98a7416,
title = "Large eddy simulation and dynamic mode decomposition of internal flow structure of pressure swirl atomizer",
abstract = "The present work reports on the flow characteristics of a pressure swirl atomizer using Large Eddy Simulation (LES) using STAR-CCM+ commercial software from SIEMENS. Upon a primary RANS simulation, grids have locally refined by a factor of Kolmogorov length scale. A time-steps of 2e-6s with 2nd order discretization scheme was used. The internal and external flow field of the spray is investigated and the swirl-related features of the nozzle are described using the extracted data on two different grids. The helical vortex inside the nozzle revealed the interaction of the generated air-core with the liquid film attached to the discharge orifice wall. Fast Fourier Transforms (FFT) confirmed the quality of LES and presents the time-scales existing in the vicinity of the data extraction probes. the By analyzing the velocity wave structure formed from outside the nozzle due to swirling flow, the primary and secondary break-up regions are distinguished and the time lag between the two are computed. Using MATLAB, Dynamic Mode Decomposition (DMD) was applied to extract the dominant structures inside the nozzle. The first DMD mode demonstrated a helical Precessing Vortex Core (PVC) due to Vortex Breakdown (VB) and its effects on the air core.",
author = "F. Vashahi and Sh Rezaei and Jeekeun Lee",
note = "Publisher Copyright: {\textcopyright} 2018 Australasian Fluid Mechanics Society. All rights reserved.; 21st Australasian Fluid Mechanics Conference, AFMC 2018 ; Conference date: 10-12-2018 Through 13-12-2018",
year = "2018",
language = "English",
series = "Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018",
publisher = "Australasian Fluid Mechanics Society",
editor = "Lau, \{Timothy C.W.\} and Kelso, \{Richard M.\}",
booktitle = "Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018",
}