Assessment of High-Resolution Numerical Simulation of Bubble-Wall Collision

Multiphase flows with a large number of bubbles induce frequent bubble-bubble and bubble-wall interactions. These interactions introduce new length scales to the
ow which are typically orders of magnitude smaller than the scales of other processes taking place in the flow. Fully resolving these newly introduced scales requires huge computational grids, which form a new challenge to simulations. In the present study, bubble-wall collisions are studied in-depth and the results are presented as validation material and benchmark for future studies of the interaction between bubbles and objects. The case describes a rising bubble colliding head-on with a wall, with material parameters chosen such that the situation resembles an air bubble in water at room temperature. The results are compared for various computational grids. Qualitative results are presented to visualize typical bubble shapes and flow patterns during the collision process. Quantitative results are presented to determine the accuracy of the obtained numerical results.