Drop Deformation Dynamics and Fragment Characteristics in the Bag-Breakup Regime
Résumé
We investigate numerically the aerobreakup of liquid droplets with a focus on the bag breakup regime. We solve the two-phase incompressible Navier-Stokes equation using the adaptive mesh refinement (AMR) technique with volume-of-fluid (VOF) interface reconstruction. To minimise the influence of mesh-induced breakup on fragment statistics which has prevented previous studies from reaching grid convergence, we utilise a recently developed numerical algorithm which artificially perforates thin fluid structures once their thickness decreases to a critical value independent of the grid size. We first show good agreement with theoretical predictions and clarify the influence of the surrounding airflow on the drop deformation. Next, we show grid convergence for fragment statistics and identify the physical mechanisms governing bag breakup.
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