Abstract

The paper describes some advancements made in using Computational Fluid Dynamics (CFD) techniques in a generic study of venting of gases to liquid pools. The work focusses on the role played by turbulence in promoting pool mixing and, in particular, explores the application of Large Eddy Simulation (LES) methodology to capture bubble-induced turbulence effects. In the first part of the paper, a study is reported involving two-dimensional simulations of a simple, vertical shear layer containing bubbles for which some turbulence data are available from experiments. This work demonstrates particularly the importance of grid size, and its relation to the ratio of the cut-off filter to the bubble diameter. Optimum model parameters derived from this study are then used in a three-dimesional simulation of a free bubble plume, for which the flow is buoyancy-driven rather than shear-induced. Points of similarity (and difference) between the two analyses are discussed and some general conclusions drawn regarding the applicability of using LES techniques for this class of flow.

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