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Showing 1 to 20 of 151 for “"bluff"”.
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A Song of the Bluff: The Phoenix of Pine Bluff Arkansas - Documentary
<p>Pine Bluff, Arkansas has long grappled with a reputation as a town riddled with crime and violence. Once a thriving agricultural center of the state, Arkansas residents tend to score the town’s successes as relics of the past. Economic decline, negative migration systems like white flight and …
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Physics-based aeroacoustic modelling of bluff-bodies
In this work physics-based modelling of bluff-body noise was performed with application to landing gear noise production. The landing gear is a primary contributor to airframe noise during approach. Noise is primarily generated from the unsteady pressures resulting from the turbulent flow around …
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Vortex-induced forces on oscillating bluff cylinders
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1993.
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Numerical studies of unsteady flow past bluff bodies
Unsteady flow past prismatic two dimensional bodies have been numerically studied by solving the full Navier-Stokes equations at Reynolds numbers up to 1000 to study onset of vortex shedding and early stages of flow evolution. Loads have been calculated for the trapezoid section by solving Poisson …
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Stability and Vortex Shedding of Bluff Body Arrays
… theory of stability of inline and staggered bluff body arrays. The nature of the flow in the unsteady regime following the onset of instability was examined for an inline and a staggered arrangement. Particular attention was focused on the vortex shedding which was visualized and quantified …
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Simulation of vortex induced vibration of a bluff body structure
… numerical simulations of circular bluff body is a continuation of previous efforts trying to study the effect of frequency and amplitudes of the cylinder oscillation that is confined in the cross-flow and inline flow separately. The k-ε turbulence model is used to simulate the …
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Large eddy simulations of bluff-body wakes on parallel computers
… the characteristics of turbulent wakes of bluff bodies. The problem considered concerns turbulent flow over a square cylinder placed normal to a uniform free stream. The Reynolds number selected for the simulations is 21,400 where detailed experimental data are available. The computation …
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The Design and Analysis of Bluff Body Dynamic Distortion Generators
… StreamVanes. After extensive literature search, bluff bodies were identified as well-known geometries that create unsteady flow features, namely in the form of periodic, paired vortex shedding. Cylindrical bluff bodies create vortex streets that shed at a known frequency determined by their …
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The aerodynamics of a diffuser equipped bluff body in ground effect
… of the flow physics of a diffuser equipped bluff body in ground effect has been undertaken. Situated at the rear of a racing car undertray, the diffuser is an important component and the least understood part of the vehicle. Diffuser performance can change dramatically with vehicle ride …
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Energy Harvesting from the Vortex-Induced Vibrations of Bluff Body Oscillators
<p>Vortex-induced vibration (VIV) of bluff bodies provides an effective mechanism for harvesting energy from fluid flows. Yet, the complex fluid-structure interactions governing vibration amplitude, synchronization, and energy transfer in single and coupled oscillators remain only partially …
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Petrography of Algal Bioherms in the Burnt Bluff Group (Silurian), Wisconsin
Made available in DSpace on 2014-12-04T19:14:23Z (GMT). No. of bitstreams: 1 6303341.pdf: 3938304 bytes, checksum: 063e9346647a83f1a2df15547ae2817e (MD5) Previous issue date: 1962
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Blind Man's Bluff - cruel revelations through the study of architectural artefacts
This dissertation is an attempt to understand the Bluff Headland of Durban by uncovering its hidden systems and ideas. By studying the abandoned built fabric visible on site including a whaling station, the ideas that once embedded themselves within those structures reveal much larger societal …
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Investigation of a space-time adaptive method for bluff body flows
The problem of large computational costs for achieving high accuracy uid dynamics simulations remains challenging. This thesis investigates an unstructured spacetime adaptive framework for unsteady ow simulations of the compressible Navier-Stokes equations. A fully-unstructured discretization of …
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Vortex dynamics and forces in the laminar wakes of bluff bodies
… study of vortex dynamics in the laminar wakes of bluff bodies. The first part consists of a series of experiments on a transversely oscillating circular cylinder in a uniform flow field at Re≲250. These experiments were carried out in a gravity-driven soap film channel, which provides a …
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Effect of Adaptive Tabs on Drag of a Square-Base Bluff Body
… tunnel testing of a 0.127m by 0.127m square-base bluff body to test the effectiveness of trailing edge tabulations to reduce drag in the Cal Poly 0.912m by 1.219 m low-speed wind tunnel. To accomplish this, the boundary layer was first measured on the trailing edge of the model for the three …
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Experimental investigation of unconfined bluff body stabilised flames with vapourised kerosene fuels
… pre-vapourised liquid fuels stabilised on a bluff body burner were investigated at two conditions: far from blow-off (φ/φbo = 1.20) and close to blow-off (φ/φbo = 1.01). Four different fuels were considered, two of which comprised of a single component (ethanol and heptane) while the other …
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Analyses of Bluff Body and Swirl-Stabilised Flames Using Large Eddy Simulation
… is present, is enhanced through the use of bluff body flame holders and swirling flow. However, these flames are prone to unstable phenomena that may hinder successful ignition or lead to the occurrence of flashback and other instabilities that may lead to flame blow-off. The stabilisation …
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