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 15 of 15 for “"Homogeneous turbulence"”.
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Large Scale Homogeneous Turbulence and Interactions with a Flat-Plate Cascade
… configuration with blade spacing and onset turbulence integral scales on the order of the chord. This provided a much needed data-set of much larger Taylor Reynolds number than previous related studies and allowed a thorough investigation of the blade-blocking effects of the cascade on the …
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Particles and Bubbles Collisions Frequency in Homogeneous Turbulence and Applications to Minerals Flotation Machines
… particles (solid particles and bubbles) in homogeneous isotropic turbulence. Both direct numerical simulations (DNS) and Large Eddy simulations (LES) are conducted to determine velocity fluctuations of the carrier phase. The DNS results are used to validate existing theoretical models as …
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Large Eddy Simulation of Shear-Free Interaction of Homogeneous Turbulence with a Flat-Plate Cascade
Studying the effects of free stream turbulence on noise, vibration, and heat transfer on structures is very important in engineering applications. The problem of the interaction of large scale turbulence with a flat-plate cascade is a model of important problems in propulsion systems. Addressing …
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Advanced Spectral Methods for Turbulent Flows
… of efficiency and accuracy, for generalized homogeneous turbulent flows, and especially for specialized applications like the computation of atmospheric flows and numerical weather prediction. In this thesis, two such innovations are presented. First, inspired by the adaptive mesh refinement …
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Experimental and Numerical Investigations of the Effects of Incident Turbulence on the Flow Over a Surface-Mounted Prism
The issue of the effects of free stream turbulence on the flow field over a surface-mounted prism is examined through experimental and numerical investigations. In the experimental studies, particle image velocimetry measurements are conducted in the ESM water tunnel at Reynolds number of $9,600$ …
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A high-order Legendre-WENO numerical scheme for the non-conservative kernel density equations modeling particle-laden flows
… to direct numerical simulation of particles in homogeneous turbulence.
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Investigating the effect of energy dissipation on flotation kinetics in an oscillating grid flotation cell
… grids exhibit relatively isotropic and homogeneous turbulence, which cannot be achieved in standard impeller agitated flotation cells. Due to this they provide a potentially ideal environment in which to investigate the effects of energy dissipation on flotation kinetics. Previous work …
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The efficiency of turbulent mixing in stratified fluids
… ocean energy provided by tidal forces leads to turbulence and thus highly dense water is lifted up from the deep sea to the surface. For this process, a mixing efficiency of 0.2 is estimated. Until now it is not completely understood how this high value can be achieved. Thus we measured the …
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Random-vortex-particle methods applied to broadband fan interaction noise
… devise a stochastic method to generate synthetic turbulence and combine it with the linearised Euler equations to predict broadband fan interaction noise. In modern turbofan designs broadband fan noise is a dominant source of aircraft noise, the most efficient source being the interaction between …
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Turbulent interactions with normal shocks and their effects on aluminum particle burn time
Interactions between turbulence and shock waves have been proposed to decrease the burn time of fuel particles due to various mechanisms such as enhanced mixing, entropy production, and transport. In order to demonstrate this e ffect, burn time measurements were obtained for laminar and turbulent …
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2D PIV Study of Grid Turbulence
… aim of the current project was to analyse grid turbulence with a technique that allows for a direct measurement of velocity derivative statistics. Two-dimensional particle image velocimetry ($2D~PIV$) of highly resolved grid turbulence at $Re_{M}=U_{\infty}M/\nu = 16000$ where $M$ is the grid …
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Kinematic simulation of turbulent flow and particle motions
… a new method for simulating high Reynolds number turbulence which requires much less computing power. This involved both theoretical work - to understand and model the important processes - and computational work, to implement the model efficiently. There are 'many different techniques for …
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Large Eddy Simulation and Wavelet Analysis of the Flow Field around a Surface Mounted Prism
… large-scale vortices with the multiplicity of turbulence scales in the incoming wind exacerbates their unsteady motion and hence significantly affects the pressure fluctuations spectra experienced by the building. Large-eddy simulations are conducted to study the interaction of homogeneous …
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Toward a Theory of Homogeneous, Isotropic Turbulence of Incompressible Fluids
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2012-02-27T21:15:16Z No. of bitstreams: 1 1971_nakano.pdf: 4067448 bytes, checksum: d794ce2ec32b3ac96c8660b08b8e878a (MD5)
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The effect of energy input on flotation kinetics
… as well as producing relatively isotropic and homogeneous turbulence with zero mean flow. Due to this, oscillating grids provide a potentially ideal environment for investigating the effects of energy input on flotation kinetics, which cannot be achieved in a mechanical flotation cell. The …