Lattice Boltzmann Simulation Of Vortices
Merging In A Two-phase Mixing Layer
Author(s)
Y. Y. Yan & Y. Q. Zu
Abstract
Mixing layers are commonly observed in flow fields of many types of industrial
equipment such as combustion chambers, chemical reactors, and fluid ejectors. It
is important to effectively mix two co-flowing gaseous/fluids streams in such
equipment. As the mixing of two fluids is an interface and surface tension
dominated process, numerical simulations of the mixing process are generally
very complex. The present study is concerned with using the lattice Boltzmann
method (LBM) to study vertices merging in a two-dimensional two-phase spatial
growing mixing layer. Different velocity perturbations are forced at the entrance
of the flow field of a rectangular mixing layer; the initial interface between twophases
is evenly distributed around the midpoint in a vertical direction. By
changing the strength of surface tension and combinations of perturbation waves,
the effects of surface tension and velocity perturbation on vortices merging are
investigated. Some interesting phenomena, which have not occurred in a singlephase
mixing layer, are observed and the corresponding mechanism is discussed.
Keywords: lattice Boltzmann method, vortices merging, mixing layer, numerical
simulation.
1 Introduction
Vortices behaviours including the formation and merging are commonly
observed in engineering applications, such as in combustion chambers, premixers
for gas turbine combustors, chemical lasers, propulsion systems, flow
reactors, micro mixers, etc. Controlling the formation and evolution of the
coherent structure in the mixing layer can improve efficiency of combustion or
chemical reaction processes; therefore studies on vortices behaviour in mixing
layers have been carried out both experimentally and computationally. Ho and
Keywords
lattice Boltzmann method, vortices merging, mixing layer, numerical
simulation.
Related Book
Other papers in this volume
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