Abstract

Three-dimensional direct numerical simulations of bidisperse bubbly gas-liquid flows in a triply-periodic cubic domain are carried out. The numerical method utilizes a finite difference scheme for the solution of the Navier-Stokes equations for the flow field and a front tracking method for the resolution and movement of the deformable bubble interfaces. These numerical experiments aim at evaluating the dependency of bubble interactions, bubble rise velocities, and bubble-induced liquid turbulence on parameters like bubble size, interface deformability, bubble size distribution, and gas volume fraction in order to gain insight into these dispersed multiphase flows. The temporal evolutions of bubble velocities and liquid turbulent kinetic energies in various bidisperse bubble systems with spherical and deformable bubbles are presented for comparison. Also given are some details about the requirements and performance of these simulations on a parallel computer platform.

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