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Dissertations / Theses on the topic 'Bluff'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

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1

Wilkinson, Catherine S. "Pleasant Bluff." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1307104489.

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2

Benson, M. "Flow past bluff bodies." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382725.

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3

Armstrong, Brian Jeffrey. "Unsteady flow over bluff bodies." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/11409.

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4

Spiteri, Matthew. "Aerodynamic control of bluff body noise." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/181529/.

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The main aim of this study was to investigate noise reduction techniques for bluff body noise. Three methods were investigated, using a splitter plate on a fairing- strut configuration, applying flow control to the surface of a fairing and fitting a splitter plate behind a isolated bluff body. Aerodynamic tests were performed in wind tunnel facilities using particle image velocimetry (PIV), hotwire anemometry, pressure sensors and a force balance. Acoustic tests using a microphone array, on-surface microphones and freefield mi- crophones were performed to investigate the noise generated by the

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5

Wolpert, Jeremy M. "Stratigraphic and structural analysis of the J1 Sandstone, Scotts Bluff Trend, Scotts Bluff and Morrill counties, Nebraska." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4925.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains xi, 103 p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references (p. 90).

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6

Nordholm, Louise, and Kristina Hammar. "Bluff-PR är som att kissa i sängen : En kvalitativ studie om PR-konsultens syn på bluff-PR." Thesis, Mittuniversitetet, Avdelningen för medie- och kommunikationsvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-21140.

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Denna studie grundar sig i den splittring som PR-konsulten befinner sig i, gällande de många etiska ställningstaganden som denne ställs inför. Detta i kombination med, att public relations som yrke ännu inte betraktas som en erkänd profession, gör att PR-branschen blir utsatt för intrång på dess område från övriga kommunikationsbranschen. Intresset för studien väcktes i samband med den intensiva mediebevakningen runt PR-konsulternas användande av bluff-PR och det sken som bluff-PR kastar över PR-branschen. Studien grundar sig i den fragmentering som idag präglar PR-branschen, gällande vikten a

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7

Polpitiye, Sisira J. "Unsteady fluid flow around certain bluff bodies." Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/34813.

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It is shown in this thesis that fluid dynamic forces on unsteadily moving bluff bodies depend on the history of motion as much as on the velocity and acceleration of motion. An empirical relationship between the motion of the body and the resulting force is obtained by analysing the effect of the history of motion on the fluid dynamic force at any instant. The fluid dynamic force, velocity and acceleration are obtained as functions of time, by oscillating test models in water while they are being towed at constant speed. The test models used are: 1. a two-dimensional circular cylinder, 2. a re

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8

Schlunke, Katrina, of Western Sydney Hawkesbury University, Faculty of Social Inquiry, and School of Humanities. "An Autobiography of the Bluff Rock Massacre." THESIS_FSI_HUM_Schlunke_K.xml, 1998. http://handle.uws.edu.au:8081/1959.7/783.

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This thesis is a multi-faceted engagement with the many events and people that came to be known as 'The Bluff Rock Massacre'. Employing a number of textual techniques it seeks to articulate the ways in which 'historical' events and particular places come to be lived out in subjects who are both past and present and in a constant state of becoming. The work employs official historical records, family histories, tourist leaflets, gossip, field notes and other texts to show the multiple ways in which an event both becomes and exceeds its invention. The thesis is concerned with the ways in which t

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9

Akbari, Mohammad Hadi. "Bluff-body flow simulations using vortex methods." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq55294.pdf.

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10

Schlunke, Katrina Maree. "An autobiography of the Bluff Rock massacre /." [Richmond, N.S.W.] : University of Western Sydney, Hawkesbury, 1999. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030811.094439/index.html.

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11

Emerson, Benjamin L. "Dynamical characteristics of reacting bluff body wakes." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49073.

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Combustion instability plagues the combustion community in a wide range of applications. This un-solved problem is especially prevalent and expensive in aerospace propulsion and ground power generation. The challenges associated with understanding and predicting combustion instability lie in the flame response to the acoustic field. One of the more complicated flame response mechanisms is the velocity coupled flame response, where the flame responds dynamically to the acoustic velocity as well as the vortically induced velocity field excited by the acoustics. This vortically induced, or hy

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12

Nakos, Dimitrios. "High resolution schemes for bluff-body aerodynamics." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8990.

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This MSc by Research study has been conducted with the application of a variety of grid configurations for extensive grid analysis along with various numerical schemes on the Ahmed body benchmark test case, in both 2D and 3D analysis. A number of different numerical schemes were used in conjunction with the Reynolds Averaged Navier – Stokes (RANS) equations for steady state simulations, by implementing the Spalart – Allmaras turbulence model as a closure to the equations. The efficiency of the aforementioned grid – numerical schemes compilation in terms of achieving physically meaningful resul

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13

Shen, Cuiqin. "Flow field characteristics around bluff parachute canopies." Thesis, University of Leicester, 1987. http://hdl.handle.net/2381/9478.

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The objectives of the present investigation are to determine the nature of the flow field around bluff parachute canopies, considering the effects of canopy shape parameters on this flow field and hence on the resulting aerodynamic forces and moments which are developed on the canopy surface. In order to relate the flow field developed around bluff parachute canopies to their aerodynamic characteristics, a series of experiments in the Leicester University wind tunnel has been conducted on a family of particularly significant canopy shapes. These cross-shaped canopies have excellent drag and st

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14

Gopalkrishnan, Ramnarayan. "Vortex-induced forces on oscillating bluff cylinders." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12539.

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15

Peers, Edward. "Physics-based aeroacoustic modelling of bluff-bodies." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/71651/.

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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 various components. The research was initiated in response to the need for an improved understanding of landing gear noise prediction tools. A computational approach was adopted so that the noise generating physics of the problem could be captured. Governing laws were solved numerically to predict the

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16

Olsen, Seth P. "History of the Logan Bluff Landslide Zone." DigitalCommons@USU, 2006. https://digitalcommons.usu.edu/etd/380.

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On September 10, 2005, a landslide occurred to the south of Utah State University Campus and Highway 89. This landslide did considerable damage to the Logan and Northern canal, which is cut into the slope, and to a residence at the toe of the slope. This event brought many parties together to collaborate on possible solutions to the immediate fix of the slide as well slides that could occur in the future. The purpose of this report is to compile information useful to the study of the area and the possible solutions and/or risk assessment of the Logan Bluff Landslide Zone. The study includes th

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17

Vallès, Brice. "Computational Study of Vortex Shedding Behind Bluff Bodies." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-567.

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<p>A computational study of vortex shedding behind bluff bodies is presented. The main focus of this work is the study of vortex shedding and wake flow behaviour behind tapered circular cylinders in the laminar flow regime. However,a stepped circular cylinder in laminar flow as well as uniform circular cylinders in the turbulent flow regime have been investigated as well. </p><p>In the laminar flow regime, the flow behaviour behind tapered and stepped circular cylinders is rather different than behind a uniform circular cylinder. Because the tapered and the stepped circular cylinders are three

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18

Narasimhamurthy, Vagesh D. "Wake dynamics of flow past tapered bluff bodies." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2324.

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19

Barrington, Peter Eric. "Application of vortex dynamics to bluff body flows." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302982.

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20

Qubain, Ala. "Active control of a turbulent bluff body wake." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506037.

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21

Brücker, Christoph [Verfasser]. "Dynamic Interaction in Bluff Body Wakes / Christoph Brücker." Aachen : Shaker, 2006. http://d-nb.info/1186584696/34.

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22

Trip, Renzo. "Shedding light on the bluff body wake instability." Doctoral thesis, KTH, Strömningsfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183545.

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The flow around a vehicle, for example, results in a large resistance and can generate a complex swirl pattern behind the body of the vehicle, which can lead to strong alternating lateral forces. There is therefore a clear need for more fundamental understanding of the instability of this so-called wake region, which arises behind bluff bodies. In this thesis, the focus lies on the relation between the wake inlet conditions and the wake characteristics of a bluff body. This relation is studied experimentally, in the Reynolds number range 2.9E3 - 5.5E4. The experiments are carried out in a spe

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23

Windiate, Sarah. "An experimental and numerical study of bluff body." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/365194/.

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An experimental and numerical investigation was performed in order to firstly establish the aerodynamics and aeroacoustics of a landing gear torque link configuration, and secondly to assess the effectiveness of both passive and active flow control as noise attenuation methods. Experimental and numerical data showed that afixing a torque link on to a half cylinder strut resulted in the suppression of vortex shedding in between the torque arms. This resulted in a narrower wake with reduced drag. PIV wake profiles showed the suppression of shedding to result in reduced velocity fluctuations, as

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24

Vernet, Julie A. "Plasma actuators for separation control on bluff bodies." Doctoral thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203208.

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25

Shanbhogue, Santosh Janardhan. "Dynamics of perturbed exothermic bluff-body flow-fields." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24823.

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Thesis (Ph.D.)--Aerospace Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Lieuwen, Tim; Committee Member: Gaeta, Rick; Committee Member: Menon, Suresh; Committee Member: Seitzman, Jerry; Committee Member: Zinn, Ben.

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26

Mushyam, Aditya. "Effects of flow control on flow past bluff bodies." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398031.

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The aim of this Ph.D. thesis, "Effects of flow control on flow past bluff bodies" is to study and analyzes the effects of Flow Control on various aspects and proverbs of flow past bluff bodies. Flow control techniques are presently researched and studied across the world to gauge their effectiveness in altering flow properties and patterns in different flow scenarios. The inspiration for the present work is derived from automobile industry, as analyzing the flow over backward step and inclined step shall help in understanding the characteristics of the rear vehicle wake. Since a considerable p

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27

Heatlie, Fiona. "Turbulent flow around bluff bodies at the floodplain edge." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/8517.

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This thesis examines the flow around bluff bodies placed at the floodplain edge in a compound, open channel. The floodplain edge location is associated with a strong shear layer between lower velocity floodplain flow and high velocity flow in the main channel. The drag force exerted by a bluff body is dependant on the way in which the flow separates around the body and subsequently recovers but the drag coefficients typically used to represent the effects of bluff bodies are based on experiments on bodies in geometrically simple channels. The differences induced in the wake structures and ther

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28

Nichols, A. R. "Vortex shedding from two rectangular bluff bodies in tandem." Thesis, Teesside University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383278.

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29

Harland, David George. "Unsteady flow around bluff bodies spanning thin rectangular ducts." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/57508.

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This project consists of a two-pronged computational and experimental approach to the study of flow in closed, thin rectangular ducts with a partial cubic blockage. Results are presented at three different bulk Reynolds numbers, ReD = 5600, 10400 and 15600, based on the channel height, which is also the blockage dimension. The new experimental data produced consists of fluctuating pressure measurements at the cube surface, with 2D-2C PIV snapshots captured simultaneously in the wake region. In addition to this, DNS data is produced at the lowest Reynolds number of ReD = 5600, allowing more det

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30

Assi, Gustavo R. S. "Mechanisms for flow-induced vibration of interfering bluff bodies." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508992.

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31

Bezzerides, Marianthe E. "Score analysis for music written for "Dead Man's Bluff"." Thesis, California State University, Long Beach, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10024094.

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<p> The process of writing music for a film involves preliminary discussions between the composer and filmmakers where decisions are made on how to create an effective score that supports the story. This project report explores the composition process of <i>Dead Man’s Bluff</i>, a short film noir story directed by Franklin Guerrero, Jr., produced by Calvin Green, Sandra McCurdy and Matt Carmody. In this project, one musical motive representing the <i>femme fatale</i> character is used to create the framework for the entire score. Variations in the musical motive demonstrate nuances in

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32

Whiteman, Jacob T. "Active Flow Control Schemes for Bluff Body Drag Reduction." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1452184221.

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33

Husain, Sajjad A. "Analysis of blowoff scaling of bluff body stabilized flames." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22565.

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34

Corbett, Sarah Lynn. "The middle Miocene Alum Bluff flora, Liberty County, Florida." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0007580.

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35

Flinois, Thibault. "Modelling and linear feedback control of bluff body flows." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/32362.

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The unsteady separated wakes that develop downstream of vehicles, buildings, and other bluff objects are the source of many environmental, safety, and performance concerns. Feedback flow control has the ability to deeply modify the dynamics of these flows in ways that often surpass other approaches. In this thesis, we focus on two complementary feedback control strategies and show that they can be readily applied to a wide range of bluff body flows in order to reduce their drag and wake fluctuations. The goal of the first approach is to stabilise an unstable steady state of the flow. It relies

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36

Copeland, Samuel J. "PROPHETS BLUFF RETROSPECTIVE: AN EXAMINATION OF A FABRICATED HISTORY." OpenSIUC, 2012. https://opensiuc.lib.siu.edu/theses/905.

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AN ABSTRACT OF THE THESIS OF SAMUEL J. COPELAND, for the Master of Fine Arts degree in CINEMA AND PHOTOGRAPHY, presented on June 26, 2012, at Southern Illinois University Carbondale. PROPHETS BLUFF RETROSPECTIVE: AN EXAMINATION OF A FABRICATED HISTORY MAJOR PROFESSOR: DANIEL V. OVERTURF Every human being is born into a world riddled with questions. Many of these questions may never have a definite answer within the course of human existence, let alone during our lifetimes. We are born into the mystery of life and if we are lucky we have our five senses to utilize in the examination and interp

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37

Larsson, Joakim, and Erik Löfquist. "Volkswagen – Das Bluff. : En kvalitativ studie kring Volkswagens utsläppsskandal." Thesis, Uppsala universitet, Institutionen för informatik och media, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-275361.

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38

Jahnke, Philip A. "Organic-walled microplankton biostratigraphy and paleoecology of the Maastrichtian Prairie Bluff Chalk formation of central and western Alabama." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06162009-063106/.

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39

Wolf, Claus Christian [Verfasser]. "The subsonic near-wake of bluff bodies / Claus Christian Wolf." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/105142805X/34.

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40

Hameury, Michel. "Development of the tolerant wind tunnel for bluff body testing." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27311.

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In conventional wind tunnels the solid-wall or open-jet test section imposes on the flow field around the test model new boundary conditions absent in free air. Unless a small model is used, the solid-wall test section generally increases the loadings on the model while the open-jet boundary decreases the loadings compared to the unconfined case. However, the development of a low wall-interference test section and its successful demonstration would allow the testing of relatively large models without the application of often uncertain correction formulae. The Tolerant wind tunnel, which makes

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41

Tombazis, Nicholas. "Effects of three-dimensional disturbances on bluff body near wakes." Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/61139.

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The three-dimensionality of the near wake of bluff bodies at high Reynolds numbers is studied experimentally. Measurements were carried out in a 0.9Imx 0.91m wind tunnel (for Re=20000 to 60000) and flow visualisation in a 0.6mx 0.6m water flume (for Re=25(X)). The main purpose is to identify inherent three-dimensional features that may also arise in nominally two-dimensional flows. In order to fix the three-dimensional effects in both time and space, a mild, periodic, geometrical disturbance was imposed on the otherwise two-dimensional geometry of a model with a blunt trailing edge. The traili

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42

Araújo, Tiago Barbosa de. "Finite bluff body wake control using boundary layer triggered transition." Instituto Tecnológico de Aeronáutica, 2012. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2177.

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The bluff body flow is often related to engeneering problems and because of it this kind of flow is largely studied. Most of the laboratory works are done with two-dimensinal (2D) or infinite flow, however the flows of industrial applications are normally three-dimensional (3D) and includes complex interactions among its shear layers. In this work, the flow over two finite circular cylinders mounted on a flat plate is studied. Passive flow control is applied on the finite cylinders, using single tripwire located at different azimuthal positions, is experimentally investigated. The influence of

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43

Castriotta, Matteo. "Numerical assessment of wind tunnel blockage effects for bluff bodies." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The blockage effect due to the presence of wind tunnel walls represents a big obstacle to the accuracy of the acquired data during testing. The flow constriction around the model depends primarly on wind tunnel dimensions and shape of the tested model. In this thesis, a numerical study of the correlation between a change in vehicle length and wind tunnel blockage effect is performed on a simple car model known as Ahmed body. To do that, two case scenarios are simulated: an open case, used as reference for the comparison, and a wind tunnel case, to simulate the effects of blockage. A compa

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44

Alomar, Antoni. "Investigation into noise emitted by bluff bodies with large roughness." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/355960/.

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A set of wind tunnel experiments were performed to study the effect of large surface roughness on circular cylinder noise, with the goal of improving landing gear noise predictions. Roughness increases vortex shedding noise levels, and shifts the peak to a lower Strouhal number. The noise levels in the fall-off range also increase, but no significant change in the fall-off rate is observed. The decrease of the vortex shedding peak frequency has been associated with early detachment caused by the effect of roughness on the TBLs, which is in agreement with previous experimental studies with smal

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45

Wang, Jiaqi. "Aerodynamic performance of bluff bodies with openings on side surface." Kyoto University, 2020. http://hdl.handle.net/2433/253252.

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46

Siegel, Stefan Gunther. "Experimental investigation of the wake behind an axisymmetric bluff body." Diss., The University of Arizona, 1999. http://hdl.handle.net/10150/284134.

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The wake of an axisymmetric bluff body was investigated using water tunnel experiments. The parameters common to all investigations were a Reynolds number of 1000 or 1500 based on the body diameter, and a boundary layer thickness entering the body base of 30% of the base diameter. Harmonic forcing was accomplished using eight individual piston pump actuators providing blowing and suction disturbances into the boundary layer close to the body base, or into the wake at the base of the body. This setup allowed the excitation of azimuthal mode numbers up to four. The resulting flow field was evalu

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47

Connely, Melissa V. "Stratigraphy and Paleoecology of the Morrison Formation, Como Bluff, Wyoming." DigitalCommons@USU, 2002. https://digitalcommons.usu.edu/etd/6736.

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The Morrison Formation at Como Bluff, Wyoming, has been historically known for containing a rich source of Late Jurassic vertebrate fossils. However, when collected, most of these fossils were not positioned into a stratigraphic or sedimentologic framework. Research shows that the Morrison Formation at Como Bluff can be divided into three members. These members can be identified by lithologic and paleontological characteristics. The lower Morrison members include the Windy Hill Member and the recently described Lake Como Member. The Windy Hill Member primarily contains near-shore marine sandst

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48

Saxena, Vivek. "Turbulence distortion around leading edges and its effect on boundary layer." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360934.

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49

Plaks, Dmitriy Vital. "Dynamics of longitudinally forced bluff body flames with varying dilatation ratios." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31767.

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Thesis (M. S.)--Aerospace Engineering, Georgia Institute of Technology, 2010.<br>Committee Chair: Tim Lieuwen; Committee Member: Jeff Jagoda; Committee Member: Suresh Menon. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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50

Cross, Caleb Nathaniel. "Combustion heat release effects on asymmetric vortex shedding from bluff bodies." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42772.

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Combustion systems utilizing bluff bodies to stabilize the combustion processes can experience oscillatory heat release due to the alternate shedding of coherent, von Kármán vortices under certain operating conditions. This phenomenon needs to be understood in greater detail, since unsteady burning due to vortex shedding can lead to combustion instabilities and flame extinction in practical combustion systems. The primary objective of this study was to elucidate the influence of combustion process heat release upon the Bénard-von Kármán (BVK) instability in reacting bluff body wakes. For th

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