Front-Tracking Method and Volume of Fluid Method
Numerical Simulations for Binary Droplet Collision
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Ming-Wei Liao
Advisor: Kuo-Long Pan, Ph.D.
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Department of Mechanical Engineering
National Taiwan University
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This study focuses on numerical simulation for binary droplets collision. We compare the numerical results with the experimental ones by front-tracking method and volume of fluid (VOF) method. Front-tracking method is controlled artificially by prescribing the rupture of the inter-drop film in multiphase flow, and the simulation results are consistent with the experimental ones. In high-speed droplet collision, the surface tension force damping option in VOF increases the viscosity in the vicinity of the interface, which damps the capillary wave effect that is invariably generated at the interface by the surface tension. In the view of physics, the droplets are not supposed to rupture in the separation regime. Therefore, if the surface tension force damping option is selected, the droplet does not rupture during the collision. The simulation condition of head-on collision of binary equal-size droplets is set. Water and tetradecane are used to be the liquid phases to predict the phenomena of droplet collision under the atmosphere. We examine the feasibility of droplet collision simulation with VOF in CFD-ACE solver. The 3D simulation results of high-speed droplet collision are obtained by VOF.
Keywords: multiphase flow, numerical simulation, droplet collision, volume of fluid method , front-tracking method.
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