Numerical study on the dynamic behavior of multiple rising bubbles using the lattice Boltzmann method

For numerical analysis of multiphase flow, each interface boundary should be captured, and the geometric deformation of the interface needs to be predicted. To predict the interface, the singular interface model and diffusion interface model can be used. Among them, free energy based lattice Boltzmann method has adopted the diffusion interface model, with which it is easy to simulate complex multiphase flow phenomena such as bubble collapse, droplet collision, and moving contact lines. A new lattice Boltzmann method for the simulation of multiphase flows is described, and test results for the validation are presented. Finally, some simulations were carried out for the investigation of dynamic behavior of multiple rising bubbles.