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Direct numerical simulation of bubble/wall and droplet/droplet collision with a motifation for lubrication

Honing, Sietske van der (2017) Direct numerical simulation of bubble/wall and droplet/droplet collision with a motifation for lubrication.

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Abstract:A Volume of fluid method is used to solve a one particle bubble flow, and a two droplet flow. For systems with large number of bubbles and/or droplets, direct numerical simulation is necessary, since there are no analytical solutions and empirical results are often muddled. To achieve good models for particle interaction it is best to start with simple cases. Two particle-interaction cases have been simulated and are presented in this paper. The bubble colliding with a wall and a head on droplet/droplet collision. These simulations have been done with a Volume of fluid multi marker method with a piecwise linear interface calculation scheme (VofMMRK), which has been implemented in OpenFOAM R . The 2D scheme has been held up to a benchmark [15] and gave accurate results, with at least first order convergence and reasonable computation cost. The 3D case has been compared to mphBox [9] and shows good overlap. Parallelization has been applied and speedup is investigated, with simple domain decomposition computing time is nearly halved when using double the amount of processors, however this speedup stagnates when using 32 processors. This may be due to the solver, the decomposition or the (small) size of the problem. Some background and application information on Lubrication is provided, which could be used to examine new and old particle interaction models.
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/74733
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