Level-set simulations of buoyancy-driven motion of single and multiple bubbles
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This paper presents a numerical study of buoyancy-driven motion of single and multiple bubbles by means of the conservative level-set method. First, an extensive study of the hydrodynamics of single bubbles rising in a quiescent liquid is performed, including its shape, terminal velocity, drag coefficients and wake patterns. These results are validated against experimental and numerical data well established in the scientific literature. Then, a further study on the interaction of two spherical and ellipsoidal bubbles is performed for different orientation angles. Finally, the interaction of multiple bubbles is explored in a periodic vertical channel. The results show that the conservative level-set approach can be used for accurate modelling of bubble dynamics. Moreover, it is demonstrated that the present method is numerically stable for a wide range of Morton and Reynolds numbers.
CitationBalcazar, N., Lehmkuhl, O., Jofre, L., Olivaa, A. Level-set simulations of buoyancy-driven motion of single and multiple bubbles. "International journal of heat and fluid flow", 01 Desembre 2015, vol. 56, p. 91-107.