The atomizing pulsed jet
Yash Kulkarni, Cesar Pairetti, Rapha\"el Villiers, St\'ephane Popinet, and St\'ephane Zaleski

TL;DR
This study uses high-resolution direct numerical simulations to analyze the complex atomization process of a pulsed liquid jet, revealing detailed flow structures and droplet statistics, and introduces a numerical method to improve convergence.
Contribution
It provides detailed visualization and analysis of high-speed atomization processes and proposes a novel numerical technique to address non-convergence issues in droplet size distribution.
Findings
Flow exhibits ligaments, sheets, droplets, and bubbles with complex interactions.
Droplet size distribution does not converge at higher resolutions due to numerical sheet breakup.
The 'manifold death' method improves convergence by controlling thin sheet breakup.
Abstract
Direct Numerical Simulations of the injection of a pulsed round liquid jet in a stagnant gas are performed in a series of runs of geometrically progressing resolution. The Reynolds and Weber numbers and the density ratio are sufficiently large for reaching a complex high-speed atomization regime but not so large so that the small length scales of the flow are impossible to resolve, except for very small liquid-sheet thickness. The Weber number based on grid size is then small, an indication that the simulations are very well resolved. Computations are performed using octree adaptive mesh refinement with a finite volume method and height-function computation of curvature, down to a specified minimum grid size . Qualitative analysis of the flow and its topology reveals a complex structure of ligaments, sheets, droplets and bubbles that evolve and interact through impacts, ligament…
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Taxonomy
TopicsLaser-Plasma Interactions and Diagnostics · Fluid Dynamics and Heat Transfer · Plasma and Flow Control in Aerodynamics
