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Direct Numerical Simulation of Bubble-Wall Interactions

Ephrati, S.R. (2019) Direct Numerical Simulation of Bubble-Wall Interactions.

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Abstract:The motion of a bubble impacting on a solid wall is studied numerically using the open-source code TBFsolver for the simulations of multiphase flows. This code employs Direct Numerical Simulation (DNS) using a volume of fluid (VOF) approach, and has already been tested for situations involving a single bubble as well as a vast number of bubbles. An extensive study is performed for a single bubble hitting a wall head-on and under an angle of 45 degrees. Bubble movement and deformation suggest that the small-scale processes that occur during bubblewall interactions are captured well by the solver. Geometric quantities along with the energy dissipation near the bubble are compared to an existing bubble collision model. A method to approximate the flow between the bubble and the wall is presented using lubrication theory. This method is applied to numerical simulation results. The outcomes are found to be in qualitative agreement with the numerical simulation data. We conclude by discussing the possibilities of applying lubrication theory to the TBFsolver.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:31 mathematics
Programme:Applied Mathematics MSc (60348)
Link to this item:http://purl.utwente.nl/essays/79143
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