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Dissertations / Theses on the topic 'Turbulent effects'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Orsi, Filho Edgar. "An Experimental Study of Turbulent Boundary Layers Subjected to High Free-stream Turbulence Effects." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/36460.

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The work presented in this thesis was on nominally two-dimensional turbulent boundary layers at zero pressure gradient subjected to high free-stream turbulent intensities of up to 7.9% in preparations for high free-stream turbulence studies on three-dimensional boundary layers, which will be done in the future in the Aerospace and Ocean Engineering Boundary Layer Wind Tunnel at Virginia Tech. The two-dimensional turbulent flow that will impinge three-dimensional bodies needed to be characterized, before the three-dimensional studies can be made. An active turbulence generator designed to creat

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2

Dunn, Matthew John. "Finite-Rate Chemistry Effects in Turbulent Premixed Combustion." University of Sydney, 2008. http://hdl.handle.net/2123/5782.

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Doctor of Philosophy (PhD)<br>In recent times significant public attention has been drawn to the topic of combustion. This has been due to the fact that combustion is the underlying mechanism of several key challenges to modern society: climate change, energy security (finite reserves of fossil fuels) and air pollution. The further development of combustion science is undoubtedly necessary to find improved solutions to manage these combustion science related challenges in the near and long term future. Combustion is essentially an exothermic process, this exothermicity or heat release essentia

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3

Osborne, David Roger. "Streamline persistence and its effects on turbulent diffusion." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420692.

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4

Cha, Chong M. "Modeling turbulent mixing effects in natural gas reburning /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/7091.

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5

Pantano-Rubino, Carlos. "Compressibility effects in turbulent nonpremixed reacting shear flows /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9981965.

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6

Szemberg, O'Connor Teddy. "Bulk viscosity effects in compressible turbulent Couette flow." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/62657.

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This work investigates the effect of bulk viscosity in one-, two-, and three{dimensional compressible fows via direct numerical simulation. The role of bulk viscosity in compressible turbulence is of increasing importance due to three applications: spacecraft descending through the Martian atmosphere, the thermodynamic cycle of solar-thermal power plant, and carbon capture and storage compressors. All three rely on the accurate description of turbulence in carbon dioxide, a gas with a bulk-to-shear viscosity ratio three orders of magnitude larger than for air. In these applications, invoking S

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7

Dogan, Eda. "Effects of large-scale free stream turbulence on a zero-pressure-gradient turbulent boundary layer." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/412650/.

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The focus of this study is to investigate the characteristics of a zero-pressure-gradient turbulent boundary layer in the presence of large-scale free-stream turbulence. Particular attention is given to scale interactions occurring within the turbulent boundary layer. The free-stream turbulence was generated by an active grid. The investigation was conducted as an experimental work using hot-wire anemometry and Particle Image Velocimetry. Large-scale structures occurring in the free-stream are shown to penetrate the boundary layer and increase the streamwise velocity fluctuations throughout. T

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8

Alhamdi, Sabah Falih Habeeb. "INTERMITTENCY EFFECTS ON THE UNIVERSALITY OF LOCAL DISSIPATION SCALES IN TURBULENT BOUNDARY LAYER FLOWS WITH AND WITHOUT FREE-STREAM TURBULENCE." UKnowledge, 2018. https://uknowledge.uky.edu/me_etds/116.

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Measurements of the small-scale dissipation statistics of turbulent boundary layer flows with and without free-stream turbulence are reported for Reτ ≈ 1000 (Reθ ≈ 2000). The scaling of the dissipation scale distribution is examined in these two boundary conditions of external wall-bounded flow. Results demonstrated that the local large-scale Reynolds number based on the measured longitudinal integral length-scale fails to properly normalize the dissipation scale distribution near the wall in these two free-stream conditions, due to the imperfect characterization of the upper bound of the iner

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9

Obligado, Martín. "Fluid-particle interactions : from the simple pendulum to collective effects in turbulence." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI108/document.

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Cette thèse est organisée en deux parties. Après une brève introduction théorique (chapitre 1) et une discussion présentant la soufflerie du LEGI et des techniques expérimentales utilisées (chapitre 2), une première partie étudie les effets individuels des particules dans les écoulements tantôt laminaires et turbulents. Dans une seconde partie je me suis intéressé aux effets collectifs d’une population dense d’inclusions en interaction avec un champ turbulent.Dans le chapitre 3, nous montrons que l’équilibre d’un disque pendulaire faisant face à un écoulement présentant une vitesse moyenne pré

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10

Gutiérrez-Matus, Pablo. "Effects on the free surface of a turbulent flow." Palaiseau, Ecole polytechnique, 2013. http://pastel.archives-ouvertes.fr/docs/00/92/19/54/PDF/PGutierrez-PhdThesis20131219.pdf.

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Nous nous intéressons aux effets en surface induits par un écoulement turbulent, en utilisant une approche expérimentale. Nous étudions un écoulement turbulent de faible épaisseur avec une surface libre. L'écoulement est produit dans un métal liquide à l'aide d'une force électromagnétique. Il présente des tourbillons, des bandes de cisaillement et des ondes, dépendent des conditions de forçage. Trois aspects ont été considérées: la déformation de surface engendré par la turbulence; les effets de la turbulence sur la propagation des ondes; et les effets de la turbulence sur des particules qui f

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11

Matulka, Anna Magdalena. "Turbulent structure in environmental flows: effects of stratification and rotation." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/52809.

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Several series of experiments in stratified and in rotating/stratified decaying flows after a grid is used to stir the two layer stable fluid brine and fresh water set up. We measure by comparing the gained potential energy with the available kinetic energy AKE, the relative efficiency of mixing. The experiments in stratified rotating flows with grid driven turbulence were both periodic (quasi stationary) and non-monotonic (decaying) forcing. This thesis compares experimental, numerical and field observations on the structure and Topology of the Stratified Rotating Flows as well as their d

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12

Johnson, A. E. "The effects of curvature and divergence on turbulent mixing layers." Thesis, University of Surrey, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279304.

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13

Viciconte, Giovanni. "Turbulent mixing driven by variable density and transport coefficients effects." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC035.

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Cette thèse est consacrée à l’étude du mélange turbulent dans des écoulements à densité variable et à coefficients de transport non uniformes. Nous utilisons un nouveau code de simulation numérique directe (DNS) basé sur une décomposition bidimensionnelle du domaine, capable de prendre en compte la densité variable et les contributions diffusives. Dans un premier temps, nous considérons le cas de la turbulence dans les plasmas faiblement couplés en compression isotrope, qui peuvent subir une dissipation soudaine d’énergie cinétique due à la croissance du coefficient de viscosité par une augmen

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14

Arnette, Stephen Andrew. "The effects of expansion regions on supersonic turbulent boundary layers /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487865929454911.

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15

Marshall, Andrew. "Turbulent flame propagation characteristics of high hydrogen content fuels." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53859.

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Increasingly stringent pollution and emission controls have caused a rise in the use of combustors operating under lean, premixed conditions. Operating lean (excess air) lowers the level of nitrous oxides (NOx) emitted to the environment. In addition, concerns over climate change due to increased carbon dioxide (CO2) emissions and the need for energy independence in the United States have spurred interest in developing combustors capable of operating with a wide range of fuel compositions. One method to decrease the carbon footprint of modern combustors is the use of high hydrogen content (HHC

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16

Wojcik, Stefanie E. "Effects of internal waves and turbulent fluctuations on underwater acoustic propagation." Link to electronic thesis, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-030906-152505/.

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17

Rehm, Jason Eric. "The effects of heat release on turbulent nonpremixed planar jet flames /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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18

Paul, Rabindra Nath. "Models to include laminar flame instability effects for premixed turbulent combustion." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627296.

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19

Khan, Md Amirul Islam. "The effects of small-scale persistent flow structures on turbulent diffusion." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619788.

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20

Humphries, P. A. "Excrescence effects on a turbulent boundary layer in an adverse pressure gradient." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368571.

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21

Trigui, Nizar. "Detailed documentation of the direct effects of Large Eddy Break- Up Devices on the turbulence structure in turbulent boundary layers /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487693923196759.

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22

Zimmermann, Robert. "How large spheres spin and move in turbulent flows." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2012. http://tel.archives-ouvertes.fr/tel-00737746.

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Le but de ce travail de thèse est l'étude de la dynamique de sphères de grande taille dans un écoulement fortement turbulent. Pour ce faire, nous avons développé une nouvelle technique optique permettant de suivre la dynamique à 6 dimensions - position et orientation absolues - de plusieurs particules dans un écoulement complexe. Bien que la taille des particules soit comparable à l'échelle intégrale de l'écoulement, nous trouvons que sa dynamique de rotation et de translation est intermittente. De plus, nous observons que la translation et la rotation sont reliées par la force de Magnus. La r

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23

Ben, Nasr Ouissem. "Numerical simulations of supersonic turbulent wall-bounded flows." Phd thesis, INSA de Rouen, 2012. http://tel.archives-ouvertes.fr/tel-01059805.

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This work deals with spatially-evolving supersonic turbulent boundary layers over adiabatic and cold walls at M∞ = 2 and up to Re0 ≈ 2600 using 3 different SGS models. The numerical methodology is based on high-order split-centered scheme to discretize the convective fluxes of the Navier-Stokes equations . For the adiabatic case, it is demonstrated that all SGS models require a comparable minimum grid-refinement in order to capture accurately the near-wall-turbulence. Overall, the models exhibit correct behavior when predictiong the dynamic properties, but show different performances for the t

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24

Bobke, Alexandra. "Simulations of turbulent boundary layers with suction and pressure gradients." Licentiate thesis, KTH, Linné Flow Center, FLOW, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-185275.

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The focus of the present licentiate thesis is on the effect of suction and pressure gradients on turbulent boundary-layer flows, which are investigated separately through performing numerical simulations.The first part aims at assessing history and development effects on adverse pressure-gradient (APG) turbulent boundary layers (TBL). A suitable set-up was developed to study near-equilibrium conditions for a boundary layer developingon a flat plate by setting the free-stream velocity at the top of the domain following a power law. The computational box size and the correct definition of the to

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25

Pouransari, Zeinab. "Numerical studies of turbulent flames in wall-jet flows." Doctoral thesis, KTH, Turbulens, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160609.

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The present thesis deals with the fundamental aspects of turbulent mixing and non-premixed combustion in the wall-jet flow, which has a close resemblance to many industrial applications. Direct numerical simulations (DNS) of turbulent wall-jets with isothermal and exothermic reactions are performed. In the computational domain, fuel and oxidizer enter separately in a nonpremixed manner and the flow is compressible, fully turbulent and subsonic. The triple “turbulence-chemistry-wall” interactions in the wall-jet flow have been addressed first by focusing on turbulent flow effects on the isother

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26

Zeybek, Serife. "Experimental Investagation Of Drag Reduction Effects Of Polymer Additives On Turbulent Pipe Flow." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606370/index.pdf.

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Since the discovery of the drag reduction effects of even small amount of macromolecules in solutions in turbulent pipe flows, there have been many experimental and theoretical studies in order to understand mechanisms behind this phenomenon. Theories have been proposed based on the observations on the change in the characteristics of the turbulent flow near the pipe wall where friction of the momentum transfer between the flow and the conduit takes place. In this study drag reduction in fully developed turbulent pipe flow with four concentrations (200 to 500 wppm) of low molecular weight So

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27

Kizildag, Deniz. "Numerical study of the non-Oberbeck-Boussinesq effects in turbulent water-filled cavities." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/387437.

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The work carried out in the framework of the present thesis aims at shedding light into the complex phenomena involved in turbulent water-filled cavities, questioning the validity of the well-established Oberbeck-Boussinesq effects, and determining the influence of these on the flow structure and heat transfer. First, the relevance of the variable thermophyical properties have been submitted to investigation by means of direct numerical simulations of a differentially heated cavity flow using the aspect ratio of a particular prototype. The simulations consider the so-called non-Oberbeck-Bous

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28

Basara, Branislav. "A numerical study into the effects of turbulent flows around full-scale buildings." Thesis, City University London, 1993. http://openaccess.city.ac.uk/8267/.

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This thesis describes the development and application of a numerical predictive procedure for turbulent flows around full-scale buildings. Two different turbulence models were considered: a complete Reynolds stress model with two alternative proposals for the pressure-strain correlations and a k-E model used in conjunction with both linear and nonlinear stress-strain relationships. The governing differential equations were discretized using finite-volume techniques and a co-located variable-storage arrangement. A multigrid method was introduced and was found to reduce the computational time by

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29

Xiang, Xue. "Corner effects for oblique shock wave/turbulent boundary layer interactions in rectangular channels." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/287477.

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In a rectangular cross-section wind tunnel a separated oblique shock reflection is set to interact with the turbulent boundary layer (oblique SBLI) both on the bottom wall and in the corner formed by the intersection of the floor with the side-walls. In such a scenario, shock-induced separation is often seen in each of the streamwise corners, resulting in a highly three-dimensional flow field in the near-wall region. To examine how the corner separations can affect the `quasi-two-dimensional' main interaction and by what mechanism this is achieved, an experimental investigation has been conduc

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30

Servat-Djoo, Kambiz. "The effects of surface curvature on heat transfer through a turbulent boundary layer." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46516.

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31

Dehbi, Abdelouahab A. (Abdelouahab Abdoun). "The effects of noncondensable gases on steam condensation under turbulent natural convection conditions." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13905.

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32

Buckland, Hannah. "Combined current, wave and turbulent flows and their effects on tidal energy devices." Thesis, Swansea University, 2014. https://cronfa.swan.ac.uk/Record/cronfa42509.

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This thesis considers the effect of disruptive waves and turbulence on a horizontal axis tidal stream turbine (TST), in terms of performance and survivability. The TST reaction to transient fluid flow is modelled analytically using Blade Element Momentum Theory (BEMT). Standard BEMT corrections are evaluated for the TST application and an alternative optimisation method is proposed for the steady state BEMT, improving compatibility with transient and depth dependent inflow, as well as the non-dimensionalisation constant needed to calculate the performance coefficients. Also, an alternative BEM

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33

Mare, Chris. "Effects of stratification on flow and dispersion around obstacles in turbulent boundary layers." Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/844132/.

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The effects of stability on the flow and dispersion downstream of a simple obstacle were studied experimentally. Experiments were conducted in the EnFlo atmospheric wind tunnel, where a stably stratified boundary layer is set up by heating the inlet air and cooling the floor of the wind tunnel. Neutral and stable boundary layers with different measures of stability have been successfully modelled and their measured characteristics are reported. The majority of the experiments were then conducted with a neutral boundary layer with a nominal freestream velocity of 2.5 m/s, and two stable boundar

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34

Trujillo, Steven Mathew. "An investigation of the effects of spanwise wall oscillation on the structure of a turbulent boundary layer /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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35

Hagelin, Susanna. "Effects of Upwelling Events on the Atmosphere." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-303882.

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During an upwelling event the cold bottom-water is brought to the sea surface. This cools the atmosphere from below and the stratification becomes more stable. When the atmosphere is more stable the turbulence is reduced and, as a consequence, so are the turbulent fluxes. This study is investigating four periods of upwelling from the Östergarnsholm-site, in the Baltic Sea east of Gotland, during the summer of 2005. The air measurements are taken at a tower at the southernmost tip of Östergarnsholm while the measurements in the water are from a buoy moored 1 km south-southeast of the tower. Dur

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36

Kim, Kyoungjin. "Computation of wake-passing effects on turbine blade boundary layers /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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37

Kunz, Thomas Joerg. "Effects of mixing depth, turbulent diffusion and nutrient enrichment on enclosed marine plankton communities." Diss., lmu, 2005. http://nbn-resolving.de/urn:nbn:de:bvb:19-45397.

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38

Kunz, Thomas J. Diehl Sebastian. "Effects of mixing depth, turbulent diffusion, and nutrient enrichment on enclosed marine plankton communities." Connect to this title online, 2005. http://edoc.ub.uni-muenchen.de/archive/00004539/.

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Thesis (Ph. D.)--Ludwig-Maximilians-Universität München, 2005..<br>Title from PDF title page (viewed on May 13, 2006). Includes three articles co-authored with Sebastian Diehl. Vita. Includes bibliographical references.

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39

Malizia, Fabio. "A numerical study of temperature effects on hot wire measurements inside turbulent channel flows." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5221/.

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A way to investigate turbulence is through experiments where hot wire measurements are performed. Analysis of the in turbulence of a temperature gradient on hot wire measurements is the aim of this thesis work. Actually - to author's knowledge - this investigation is the first attempt to document, understand and ultimately correct the effect of temperature gradients on turbulence statistics. However a numerical approach is used since instantaneous temperature and streamwise velocity fields are required to evaluate this effect. A channel flow simulation at Re_tau = 180 is analyzed to make a fi

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40

Fomison, N. R. "The effects of bluntness and sweep on glancing shock wave turbulent boundary layer interaction." Thesis, Cranfield University, 1986. http://dspace.lib.cranfield.ac.uk/handle/1826/10550.

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An experimental investigation has been performed into the effects of leading edge bluntness and sweep on the mean flow characteristics of a glancing shock wave turbulent boundary layer interaction. A series of blunt un swept shock generators (ranging in leading edge diameter from O to 1.0 ins) and a series of sharp swept generators (covering angles of sweep from 0 to 75°) were tested at incidences up to 30° at a Mach number of 2.4 and a free stream Reynolds number of 2.6 x 106 m 1. The results obtained, using a combination of oil flow visualisation, static pressure measurements, schlieren phot

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41

Apsilidis, Nikolaos. "Experimental Investigation of Turbulent Flows at Smooth and Rough Wall-Cylinder Junctions." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/71713.

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Junction flows originate from the interaction between a fluid moving over a wall with an obstacle mounted on the same surface. Understanding the physics of such flows is of great interest to engineers responsible for the design of systems consisting of wall-body junctions. From aerodynamics to turbomachinery and electronics to bridge hydraulics, a number of phenomena (drag, heat transfer, scouring) are driven by the behavior of the most prominent feature of junction flows: the horseshoe vortex system (HVS). Focusing on turbulent flows, the complex dynamics of the HVS is established through its

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Yip, Ronald S. K. "An investigation of the effects of periodic wake disturbances on flat-plate boundary layers." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25147.

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Flat plate turbulent boundary layers disturbed by periodic moving wakes have been observed in an experimental rig mounted in a low speed wind tunnel. The wakes are produced periodically by cylinders traversing in front of the leading edge of a flat plate on which the boundary layers are measured. This is to simulate the unsteady flow pattern generated by upstream blades on the downstream blade boundary layer in an axial flow turbomachine. Both the time-averaged and ensemble-averaged data are taken from the free stream and boundary layer at different flow conditions. Free stream steady and uns

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Watkins, Simon, and simon@rmit edu au. "Windtunnel modelling of vehicle aerodynamics: with emphasis on turbulent wind effects on commercial vehicle drag." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 1990. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061016.122635.

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Fuel represents a major proportion of road transport expenditure and it is likely that this proportion will increase. At typical road speeds approximately half of the total fuel used is consumed in overcoming aerodynamic drag, hence the determination and reduction of aerodynamic drag is of considerable importance. This is normally performed by scale testing in wind tunnels with relatively smooth flow. When modelling an atmospheric crosswind in the tunnel the relative air direction is generated by yawing the model at an angle to the oncoming flow. This procedure does not reprodu

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Schulz, Joseph C. "A study of magnetoplasmadynamic effects in turbulent supersonic flows with application to detonation and explosion." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53971.

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Explosions are a common phenomena in the Universe. Beginning with the Big Bang, one could say the history of the Universe is narrated by a series of explosions. Yet no matter how large, small, or complex, all explosions occur through a series of similar physical processes beginning with their initiation to their dynamical interaction with the environment. Of particular interest to this study is how these processes are modified in a magnetized medium. The role of the magnetic field is investigated in two scenarios. The first scenario addresses how a magnetic field alters the propagation of a ga

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45

Miller, Mark A. "Experimental Characterization of Roughness and Flow Injection Effects in a High Reynolds Number Turbulent Channel." UKnowledge, 2013. http://uknowledge.uky.edu/me_etds/26.

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A turbulent channel flow was used to study the scaling of the combined effects of roughness and flow injection on the mean flow and turbulence statistics of turbulent plane Poiseuille flow. It was found that the additional momentum injected through the rough surface acted primarily to enhance the roughness effects and, with respect to the mean flow, blowing produced similar mean flow effects as increasing the roughness height. This was not found to hold for the turbulence statistics, as a departure from Townsend’s hypothesis was seen. Instead, the resulting outer-scaled streamwise Reynolds str

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46

Page, Jennifer Lynn. "The effects of plume property variation on odor plume navigation in turbulent boundary layer flows." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29752.

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Thesis (Ph.D)--Biology, Georgia Institute of Technology, 2009.<br>Committee Chair: Weissburg, Marc; Committee Member: Hay, Mark; Committee Member: Kubanek, Julia; Committee Member: Webster, Donald; Committee Member: Yen, Jeannette. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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47

Simon, Bruno. "Effects of tidal bores on turbulent mixing : a numerical and physical study in positive surges." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00965582.

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Tidal bores are surge waves propagating upstream rivers as the tide rushes into estuaries. They induce large turbulences and mixing of the river and estuary flow of which effects remain scarcely studied. Herein, tidal bores are investigated experimentally and numerically with an idealised model of positive surges propagating upstream an initially steady flow. The experimental work estimated flow changes and typical turbulent length scale evolution induced by undular bores with and without breaking roller. The bore passage was associated with large free surface and flow velocity fluctuations, t

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48

Bennington, Jeremy Lawrence. "Effects of Various Shaped Roughness Elements in Two-Dimensional High Reynolds Number Turbulent Boundary Layers." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/34907.

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Modeling the effects of surface roughness is an area of concern in many practical engineering applications. Many current roughness models to this point have involved the use of empirical 'constants' and equivalent sand grain roughness. These underdeveloped concepts have little direct relationship to realistic roughness and cannot predict accurately and consistently the flow characteristics for different roughness shapes. In order to aid in the development of turbulence models, the present research is centered around the experimental investigation of seven various shaped single roughness ele

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49

Hussain, T. "Experimental investigation of the effects of hydrogen addition on the dynamics of turbulent premixed flames." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1456277/.

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With an ever increasing need for the reduction of carbon and nitrogen based emissions, gas turbine technology has evolved over the years. Lean burning (i.e. high air to fuel ratio) has proven to be an effective method in reducing the nitrous oxide emissions. However, these flames are susceptible to combustion oscillations that could lead to excessive heat transfer, oscillatory thermal and mechanical stresses and flame blow-off or flashback. The addition of hydrogen fuel to turbulent flames has been studied in the past and been reported to have reduced combustion oscillations and nitrous oxide

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Mendoza, Jeffrey Michael. "Effects of cavity dimensions, boundary layer, and temperature on cavity noise generation and control." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/11959.

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