Simulation Of Wandering Phenomena In Bubble Plumes Via A K-Є Model And A Large-Eddy-Simulation (Les) Approach.

Abstract

In this paper, we focus on numerical simulations of the wandering phenomenon in
bubble plumes, obtained with a new comprehensive model. The theoretical model has been
developed from the theory of multi-component fluids. We have implemented that model in a
finite-element, parallel platform.
After a brief discussion about the theoretical/numerical model, we describe and analyze the
simulations of the wandering motion using the k-_ model. We show that this solution replicates
wandering only for a relatively short period of time. The reasons for this fact are analyzed.
Then, we present results obtained with the use of a Large-Eddy-Simulation (LES) approach.
These results notably mimic observations of bubble plume wandering without any restriction.
Finally, we employ the unsteady results of the LES approach to perform a detailed analysis
of turbulence in bubble plumes.