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Abstract

The VOF (Volume of Fluids) and CLSVOF (Coupled Level Set and VOF) methods are both methodologies in capturing the interface of two phase fluids. Despite some comparison on the rising velocity and interface capturing for certain simple cases of bubbles at certain times of the simulation, no full comparison of the interface capturing for cases of breakups and coalescence along with the stage by stage interface comparison has been completed. In this paper, the shape and deformation of buoyancy driven spherical bubble rising in a 2D channel is numerically investigated. The VOF and CLSVOF models have been used in the numerical simulation and the results were compared both qualitatively and numerically for both models. This specific bubble size and case was chosen since it involves breaking up, coalescence and deformation which is essential in examining the ability of accurate interface capturing of different methodologies. The results show the effectiveness and faster mesh convergence of the CLSVOF method; however higher computational time is required for this method. The results show that while the VOF method required a finer mesh to capture the bubble accurately, the CLSVOF has effect on the shape of the bubble, and significant effects on the velocity field and wake pressure.

Keywords

bubble Level set CLSVOF VOF interface tracking break-up coalescence deformation

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Comparison of the VOF and CLSVOF Methods in Interface Capturing of a Rising Bubble

Abstract

Keywords

References