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- W1501408086 abstract "In the present thesis a linearized formulation of the Navier-Stokes equations is used to study two main subjects:the generation of near-wall streaks in turbulent boundary layers and the response of turbulent wall-boundedflows to streamwise-travelling waves of spanwise oscillations of the bounding walls. For the purposes of thepresent work, these oscillations of the wall have been considered as a flow control mechanism.A mathematical model, based on a velocity-vorticity formulation linearized around a turbulent mean base flow,is adopted to simulate the fluid flow equations. A hybrid spectral-finite differences solver has been employedto numerically implement the linearized system.A review on turbulent streak generation is presented and the concepts of exponential growth, algebraic growthand viscous dissipation of small-scale perturbations are linked to the concept of transient growth. Mechanismsof generation of near-wall streaks are explored using a large set of sources of excitation for the linearized Navier-Stokes equations (LNSE). Two types of sources, here labelled as Excitation Mechanisms (EM), are employed:a body-force source and an initial condition. The selection of parameters for the excitation mechanisms isperformed based on the definition of a multi-step optimization problem. The different EMs studied consistof a restricted number of parameters, and therefore can be considered as a Low Order Model (LOM) for thegeneration of streaks. It is shown that both types of EM produce satisfactory results for the streak generationprocess evaluated in terms of experimentally expected optimal spanwise scales.Finally, a large set of numerical experiments are conducted to evaluate the response of the LNSE with optimisedEM, to the flow control by a spanwise oscillating wall. By comparing the results between the response of theLNSE considered here to this type of flow control against a drag-reduction map obtained by DNS in otherstudies, it is possible to assess the correlation between streak evolution and disruption of the skin-friction drag.A good agreement between these two responses is found for the parameter space of the streamwise-travellingspanwise oscillation waves." @default.
- W1501408086 created "2016-06-24" @default.
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- W1501408086 date "2012-10-01" @default.
- W1501408086 modified "2023-10-16" @default.
- W1501408086 title "Low order modelling of flow-control techniques for turbulent skin-friction reduction" @default.
- W1501408086 hasPublicationYear "2012" @default.
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