Abstract
Three-layer stratified shear flows provide an excellent opportunity to study the interaction between fluid-fluid interfaces. In this paper we explore this coupling by studying a pair of nonlinear evolution equations derived in the limit of strong surface tension. The addition of a third fluid, hence a second interface, destabilizes the linearized system, and we use a numerical approach to simulate the resulting disturbance growth. A range of nonlinear phenomena are subsequently observed which include stable traveling waves, droplet formation of the middle fluid, quasi-periodicity, and coarsening phenomena, as shown in the key image.
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