@article{968436f8a6754b51a6eb278bccb621f6,
title = "Modal analysis and interface tracking of multiphase flows using Dynamic Mode Decomposition",
abstract = "Non-invasive visualization techniques for multiphase flows are critical to understanding primary atomization and sprays. We use back-lit imaging to identify the liquid–gas interface of two-phase flows at high temporal and spatial resolutions and employ Dynamic Mode Decomposition (DMD) to study the shape and frequency of instabilities of a liquid jet surrounded by a coaxial annular airblast atomizer. However, DMD is not suitable for interface tracking, so we develop a data-driven two-step approach using the optical sensor data. The method uses DMD on the optical flow field estimated from image snapshot pairs. We demonstrate our method to a representative toy problem of an oscillating drop and on the primary atomization of a numerical planar liquid jet. Finally, we apply our method to the experimental liquid jet from the coaxial airblast atomizer using back-lit imaging. Our method is able to accurately reconstruct and predict the flow and preserves the sharpness of the fluid interface.",
keywords = "Atomizing jet, Dynamic mode decomposition, Optical flow estimation, Reduced-order modeling",
author = "Palash Sashittal and Robert Chiodi and Morgan, {Timothy B.} and Olivier Desjardins and Heindel, {Theodore J.} and Bodony, {Daniel J.}",
note = "This work was sponsored, in part, by the Office of Naval Research (ONR) as part of the Multidisciplinary University Research Initiatives (MURI) Program, United States, under grant number N00014-16-1-2617. The camera used in the experimental work was purchased through an ONR Defense University Research Instrumentation Program (DURIP) grant number N00014-18-1-2380. The views and conclusions contained herein are those of the authors only and should not be interpreted as representing those of ONR, the U.S. Navy or the U.S. Government. All authors read and approved the final manuscript. This work was sponsored, in part, by the Office of Naval Research (ONR) as part of the Multidisciplinary University Research Initiatives (MURI) Program, United States , under grant number N00014-16-1-2617 . The camera used in the experimental work was purchased through an ONR Defense University Research Instrumentation Program (DURIP) grant number N00014-18-1-2380 . The views and conclusions contained herein are those of the authors only and should not be interpreted as representing those of ONR, the U.S. Navy or the U.S. Government. All authors read and approved the final manuscript.",
year = "2022",
month = dec,
doi = "10.1016/j.ijmultiphaseflow.2022.104198",
language = "English (US)",
volume = "157",
journal = "International Journal of Multiphase Flow",
issn = "0301-9322",
publisher = "Elsevier B.V.",
}