Streakline-based closed-loop control of a bluff body flow

Abstract

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Topology of dynamical reconstructions from Lagrangian data

“…In practical situations, this may correspond to different scale problems ranging from oil spills in the ocean or to the injection of small amounts of drugs from small tubes in cells of microfluidic devices. Streaklines are used in the laboratory to visualize flows, to develop flow control strategies [55] or to analyze mixing [56]. Computing a streakline for a kinematic model amounts to conducting a virtual experiment in which dye is continuously released from a fixed location, called seeding or injection point.…”

Topological colouring of fluid particles unravels finite-time coherent sets

“…Producing streaklines amounts to conducting an experiment in which dye is continuously released from a single or from multiple injection points. In the laboratory, the technique can be easily implemented and is often used to visualize flow patterns, in order to develop flow control strategies (Roca et al 2014) or to analyse mixing (Balasuriya 2017). Streaklines are especially relevant because they can be assumed to correspond to what is observed in a naturally occurring event, such as an oil spill, if diffusion and other processes (weathering or chemical reactions) are neglected.…”

Transport between two fluids across their mutual flow interface: the streakline approach

“…It will be argued that the concept of a streakline is the most appropriate to use, under the condition that the velocity agitation is confined to a certain region. (The streaklines used here are not associated with stable/unstable manifolds, as might be the case if considering the interface between a fluid and a bluff body [53][54][55][56].) Briefly, this is because if the agitation is confined to being downstream of a in the top panel of Fig.…”