Location:London, UK

Wall-bounded shear flows, such as boundary layers, pressure-driven channels, pipes and Couette flows, are fundamental configurations in fluid mechanics. Their geometrical simplicity makes them important reference flows for many industrial applications, such as innovative design of next-generation vehicles, gas and oil transportation through pipe lines, energy harvesting from atmospheric surface layer, disease development and modelling of cardiovascular fluid systems. However, turbulence in such simple shear flows still poses challenging problems in fluid mechanics. Coherent structures play a central role in transport of momentum and mass in a given fluid turbulence, and their understanding has lied at the heart of turbulence research for many years. For the past three decades, significant progress has been made in two directions. One is the emergence of new theoretical frameworks for description of transition and coherent structures at low Reynolds numbers: important contributions come from linear and quasi-linear analyses (based on transient growth, properties of the resolvent or, stochastic analyses with appropriate closure models), the application of nonlinear dynamical systems concepts (e.g. state-space analysis with invariant solutions such as stationary/traveling waves and periodic orbits), and new ideas for the spatio-temporal aspects of the flow near transition (often related to phase transitions of the directed percolation ...

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