Abstract
We have developed hybrid numerical simulation codes to investigate the dynamics of nanobubbles. The idea is based on a combination of a molecular dynamics (MD) technique and a computational fluid dynamics (CFD) scheme with the Lattice Boltzmann method. In the hybrid simulation, the simulation cell is divided into two parts. The inner region containing a bubble (or bubbles) consists of sufficiently large number of particles and is treated with the MD method. The outer region is treated with CFD scheme. The boundary between the inner and outer regions is movable and driven with the pressure difference between the two regions. To deal with the moving boundary, we adopt the level set method. We will show non-spherical deformation of a bubble and investigate dynamic properties of nanobubbles, e.g., pressure and shape change.
