Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"coherent flow structures"”.
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Analysis of the effects of coherent flow structures on the transport of particles around submerged obstacles in streams
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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Particle motion in the near bed region of a turbulent open channel flow: Implications for bedload transport by saltation and sediment entrainment into suspension
… the near bed region of a turbulent open channel flow. Two different aspects of this phenomenon are examined, namely the mode of transport denoted as saltation, and the process of particle entrainment into suspension. The main approach followed is experimental, using visualization and particle …
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Studies On The Behaviour Of Solid Particles In Turbulent Gas Flows
… particles in a numerically simulated turbulent flow. The numerical simulation of the pseudo-turbulence was based upon a vortex method in which the velocity fluctuations of the turbulent flow were simulated by arrays of randomly positioned vortices. The calculation of the motion of the spherical …
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Large Eddy Simulation and Analysis of Shear Flows in Complex Geometries
… to numerically investigate two types of shear flows in complex geometries, (i) a novel momentum driven countercurrent shear flow in dump geometry and (ii) a film cooling flow (inclined jet in crossflow). Verification of subgrid scale model is done through comparisons with measurements for a …
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Dynamic Estimation of Large-Scale Flow Events in Open Cavity Flows
<p>Flow over an open cavity has a dynamically complex flowfield, generating pressure fluctuations that can amplify shear stress and cause structural damage to the stores within it and the aircraft as a whole. These pressure loads are linked to large-scale resonant shear layer phenomena. …
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Use of numerical simulations to investigate the performance of a virtual acoustic Doppler current profiler in characterizing flow
… current profiler (ADCP) in characterizing flow fields and mean velocity profiles from stationary and moving platforms. This was accomplished in part using a data set with high temporal and spatial resolution from a direct numerical simulation of turbulent open channel flow. The extent of …
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Initiation of Particle Movement in Turbulent Open Channel Flow
… objective of this thesis is to investigate the flow conditions that lead to coarse grain entrainment at near incipient motion conditions. Herein, a new conceptual approach is proposed, which in addition to the magnitude of hydrodynamic force or flow power, takes into account the duration of the …
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Suppression of thermoacoustic instabilities in a swirl combustor through microjet air injection
… lean-premixed combustor: the role of the major coherent flow structures, and the potential for using secondary air injection to passively suppress combustion instability. Microjets inject air into the combustion chamber in the flame anchoring zone. These microjet injectors attempt to modify the …
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Passive Flow Control with Shark Skin and the Relevance of Low Speed Streaks to Denticle Actuation
… as scales, which may be crucial to delaying flow separation. The teeth-like denticle morphology and flexibility of the scales measured by bristling angle vary along the shark's streamlined body [1]. Scales with narrow and long crowns have higher bristling angles at strategic locations, such …