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 20 of 30 for “"Flow turbulence"”.
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Crackle noise from high-speed free-shear-flow turbulence
… noise is lacking, and in particular, the root turbulence mechanisms that give rise to the skewed acoustic signal are unknown. Direct numerical simulations (DNS) of high-speed free-shear-flow turbulence are used to assess the underlying mechanisms and quantify near-field nonlinearity as …
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Characterization of Flow Turbulence Induced by a Bubble-Plume in Large-Scale Experiments
… experimental conditions on the observed turbulence parameters allowed identifying the main variables (tank geometry, water depth, and air discharge) controlling the induced mixing in the tank. Finally, the extensive set of experimental data was summarized in a set of dimensionless plots …
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Evaluation of the Interaction Between Flow Turbulence and Corrosive Material Transport Around Bridge Piers
… the influence of corrosion on turbulent flow around bridge piers and its implications for structural integrity and environmental safety. By examining the interaction between flow turbulence and corrosion-induced particles, the research highlights their effects on vortex formation, …
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Evaluation of the Interaction Between Flow Turbulence and Corrosive Material Transport Around Bridge Piers
… the influence of corrosion on turbulent flow around bridge piers and its implications for structural integrity and environmental safety. By examining the interaction between flow turbulence and corrosion-induced particles, the research highlights their effects on vortex formation, …
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Finite-Volume Optimal Large -Eddy Simulation
… LES model is applied to more a more complex flow, the temporally-growing shear layer. The results obtained with dynamic optimal finite-volume LES models are comparable with the DNS results of Rogers & Moser (1994), at a fraction of the cost. One expects the results from the shear layer to be …
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Análise da aerodispersão de contaminantes em laboratórios de pesquisa com biossegurança
… this class of problems, is affected by indoor flow turbulence intensity and by the BSC’s inflow velocity. The strategy of increasing room ventilation rate may reduce this containment cabapility. A transient simulation was performed, in order to produce information on the order of the time scale …
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Numerical Framework for Simulating Multiphase Flows with Phase Change
… framework for simulating such a vaporizing flow. The framework is built from the ground up starting from the laws of conservation of mass, momentum, and energy combined with the relevant thermodynamic relations. The framework discussed in this work will have a few properties that make it …
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The Space-time Structure of an Axisymmetric Turbulent Boundary Layer Ingested by a Rotor
… applications, urban air-transportation and turbulence ingestion noise. The combined effect of lateral curvature and streamwise pressure gradient are examined on the mean flow, turbulence structure, velocity correlations and wall pressure fluctuations. Additionally, the upstream influence of …
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Performance measurements of a flashing flow nozzle
The performance of a flashing flow nozzle was quantified by efficiency and metastability measurements. Efficiency was calculated over a range of operating conditions, by using both inlet and exit conditions and the nozzle thrust. Metastability was quantified by a parameter that compared the …
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Boundary Shear Stress Along Vegetated Streambanks
… streambank vegetation on near-bank velocity and turbulence; (2) determining a method for measuring BSS; and, (3) examining the effects of streambank vegetation on BSS using an existing model. A second order prototype stream, with individual reaches dominated by the three vegetation types (trees, …
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The effect of turbulence on survival, dispersal, and swimming behavior of grass carp eggs and larvae
… they are more susceptible to damage via enhanced flow turbulence levels and altered flow conditions. In order for these alternative strategies to be effective, is necessary to study the physics underlying the movement of eggs and larvae in streamflow, and to quantify the turbulence thresholds that …
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Dynamics and parameterization of stably stratified turbulence: implications for estimates of mixing in geophysical flows
… scales of overturns in stably-stratified shear-flow turbulence and the fundamental length scales constructed from dimensional analysis of basic physical quantities. In geophysical flows such as the ocean, overturns are relatively easy to observe while the basic quantities are not. As such, …
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Simulations of droplet dispersion in the wakes of cylinders and icing tunnel spray bars
… trajectory approach while the turbulent air flow was investigated with a hybrid Reynolds-Averaged Navier-Stokes/Large-Eddy Simulations approach scheme. In the first study, droplets were injected downstream of a cylinder at sub-critical conditions (i.e. with laminar boundary layer separation). …
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Computational fluid dynamics (CFD) modelling of critical velocity for sand transport flow regimes in multiphase pipe bends.
… hydrocarbon production. Knowledge of the flow characteristics of solid particles in fluids when transported in pipelines is important, in order to accurately predict solid particle deposition in pipelines. This thesis presents the development of a three-dimensional (3D) computational fluid …
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Free-surface turbulence and air-water gas exchange
… gas transfer through direct measurements of turbulence at the air--water interface. To enable this study, a new approach to the particle image velocimetry (PIV) technique is developed in order to quantify free-surface flows. Two aspects of this work are innovative. First, the use of a …
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The sedimentology and dynamics of mega-dunes, Jamuna river, Bangladesh
… thesis quantifies the occurrence, morphology and flow dynamics of dune bcdforms in the main rivers of Bangladesh: the Jamuna, Meghna and Ganges. Field work was conducted as part of the River Survey Project (Bangladesh Flood Action Plan 24) between November 1993 and March 1996, hence encompassing …
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Flame Structure and Emissions of Strongly-Pulsed Turbulent Diffusion Flames with Swirl
… of strongly-pulsed, non-premixed flames with co-flow swirl. The fuel injection is controlled by strongly-pulsing the fuel flow by a fast-response solenoid valve such that the fuel flow is completely shut off between pulses. This control strategy allows the fuel injection to be controlled over a …
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A Study of Centrifugal Buoyancy and Particulate Deposition in a Two Pass Ribbed Duct for the Internal Cooling Passages of a Turbine Blade
… temperature operating conditions alters the mean flow, turbulence, and heat transfer augmentation due to Coriolis and centrifugal buoyancy forces that arises from density stratification in the domain. Gas turbine engines operate in particle laden environments (sand, volcanic ash), and particulate …
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Large-Eddy Simulations of Hydrocyclones
This dissertation investigates the flow physics, turbulence structure, and particle classification process in hydrocyclones using large-eddy simulations of turbulent multiphase flow. Two types of hydrocyclones are considered. The first is a classifying hydrocyclone, and the second is a mineral …
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