Application of lattice Boltzmann method to research bubble interacting with spherical particle

During the process of bubbles interacting with particles, the bubble movement velocity, jetting phenomenon, topological deformation, and even properties of flow field may demonstrate novel variation. To investigate these characteristics, the lattice Boltzmann method (LBM) which is based on kinetic theory is adopted to build up the three dimensional coupled model. The gas-liquid interface with large density ratio is described with free-energy based lattice Boltzmann multiphase model, and the fluid-structure boundary is implemented in the form combining LBM and finite difference method (FDM). Except the obvious and traditional phenomenon such as large interface deformation and velocity variation, it has been found that the gravity-driven spherical bubble finally become a bubble ring after the coupling process. Combining the intrinsically microscopic property of LBM, the complex coupling process is researched with deeper study on relative size and fluid properties. The results may not only advance the LBM application in multiphase coupling field, but make a significant insight into the micro-transient phenomena of bubbles interacting with particles.