Thèses sur le sujet « Wake structures »
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Lam, Fung. « Induced drag and wake structures behind wings ». Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316745.
Texte intégralMuld, Tomas W. « Analysis of Flow Structures in Wake Flows for Train Aerodynamics ». Licentiate thesis, KTH, Mechanics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12746.
Texte intégralTrain transportation is a vital part of the transportation system of today anddue to its safe and environmental friendly concept it will be even more impor-tant in the future. The speeds of trains have increased continuously and withhigher speeds the aerodynamic effects become even more important. One aero-dynamic effect that is of vital importance for passengers’ and track workers’safety is slipstream, i.e. the flow that is dragged by the train. Earlier ex-perimental studies have found that for high-speed passenger trains the largestslipstream velocities occur in the wake. Therefore the work in this thesis isdevoted to wake flows. First a test case, a surface-mounted cube, is simulatedto test the analysis methodology that is later applied to a train geometry, theAerodynamic Train Model (ATM). Results on both geometries are comparedwith other studies, which are either numerical or experimental. The comparisonfor the cube between simulated results and other studies is satisfactory, whiledue to a trip wire in the experiment the results for the ATM do not match.The computed flow fields are used to compute the POD and Koopman modes.For the cube this is done in two regions of the flow, one to compare with a priorpublished study Manhart & Wengle (1993) and another covering more of theflow and especially the wake of the cube. For the ATM, a region containing theimportant flow structures is identified in the wake, by looking at instantaneousand fluctuating velocities. To ensure converged POD modes two methods toinvestigate the convergence are proposed, tested and applied. Analysis of themodes enables the identification of the important flow structures. The flowtopologies of the two geometries are very different and the flow structures arealso different, but the same methodology can be applied in both cases. For thesurface-mounted cube, three groups of flow structures are found. First groupis the mean flow and then two kinds of perturbations around the mean flow.The first perturbation is at the edge of the wake, relating to the shear layerbetween the free stream and the disturbed flow. The second perturbation isinside the wake and is the convection of vortices. These groups would then betypical of the separation bubble that exists in the wake of the cube. For theATM the main flow topology consists of two counter rotating vortices. Thiscan be seen in the decomposed modes, which, except for the mean flow, almostonly contain flow structures relating to these vortices.
QC 20100518
Gröna Tåget
Ryan, Kris. « The analysis of wake structures behind stationary, freely oscillating and tethered cylinders ». Monash University, Dept. of Mechanical Engineering, 2004. http://arrow.monash.edu.au/hdl/1959.1/9605.
Texte intégralMuld, Tomas W. « Slipstream and Flow Structures in the Near Wake of High-Speed Trains ». Doctoral thesis, KTH, Farkost och flyg, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-94182.
Texte intégralQC 20120530
Krueger, Matthew J. « Three-dimensional vortical structures in the wake of a flexible flapping foil ». Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32950.
Texte intégralIncludes bibliographical references (leaf 22).
This project aims to gain a qualitative view of the three-dimensional vortical structures of a flexible flapping foil at Reynolds number 164. Flexible foils were fabricated, coated with fluorescent dye, and towed with heave and pitch in a large glass tank. The foil cross section is a NACA 0030 foil shape, and the foil has an aspect ratio of 3. Pictures where taken of the vortical structures from planform, wingtip, and isometric views over a range of Strouhal number and kinematic parameters. Results are compared to previous experimental and numerical studies.
by Matthew J. Krueger.
S.B.
Zhong, Shan. « An interferometric study of organized structures in compressible turbulent flows ». Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319551.
Texte intégralKarunakaran, Arvind. « Truce structures : examining cross-professional coordination in the wake of technological and institutional change ». Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118004.
Texte intégralCataloged from PDF version of thesis.
Includes bibliographical references.
This research examines the structures, processes, and mechanisms that facilitate cross-professional coordination during periods of technological and institutional change. My study draws on a 24-month ethnographic study, combined with historical data and quantitative analysis, of 911 emergency management organizations in the United States. In Chapter 2, I focus on the mechanisms to facilitate cross-professional coordination in conditions that are marked by protracted jurisdictional conflicts. My findings articulate the importance of truce structures - an ensemble of truce roles and organizational forms - that are intended to address protracted jurisdictional conflicts among symmetrical professions such as police officers and firefighters. I further find that the coevolution of truce roles and organizational forms resulted in the emergence of a specific truce profession - in this case, that of 911 Public Safety Telecommunicators. The truce profession serves to triage, direct, and channel contested tasks among the conflicting professions without bringing those professions into direct contact with each during the initial stages of coordination when the "definition of the situation" is getting worked out. In Chapter 3, I turn to examining how the truce professionals navigate what I call status-authority asymmetry in order to effectively coordinate with the focal professionals. Conducting within-shift comparisons of coordination encounters between 911 dispatchers and police officers, I identify that the bounded publicization tactic performed via the open radio channel allows dispatchers to generate peer knowledge about individual non-compliance. Through this process, dispatchers navigate the status-authority asymmetry and orchestrate effective cross-professional coordination. My focus in Chapter 4 shifts to examining how truce professionals respond to the public's increased digital scrutiny, and consider the consequences for organizational accountability. My findings suggest that the public's increased use of mobile phones and social media to monitor and report on organizations and their workers can, under some conditions, end up worsening accountability. I unpack the processes that generate this paradox of public accountability, showing how these processes reshape the work of truce professionals and produce a vicious cycle of coordination that worsens organizational accountability. I end with a concluding chapter that discusses the implications of my dissertation for research on cross-professional coordination, accountability, and technological change.
by Arvind Karunakaran.
Ph. D.
Carmer, Carl Friedrich v. « Shallow turbulent wake flows momentum and mass transfer due to large-scale coherent vortical structures / ». Karlsruhe : Univ.-Verl, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?idn=976439034.
Texte intégralSutkowy, Mark Louis Jr. « Relationship between Rotor Wake Structures and Performance Characteristics over a Range of Low-Reynolds Number Conditions ». The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534768619864476.
Texte intégralSönmez, Nurcan. « Investigating Wind Data and Configuration of Wind Turbines for a Turning Floating Platform ». Thesis, KTH, Mekanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148957.
Texte intégral羅志永 et Chi-wing Law. « The flow structures and vortex interaction in the subcritical regime in the near wake of a circular cylinder ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31238816.
Texte intégralGieseke, Thomas J. « Identification of coherent structures in the turbulent wake of a circular cylinder with comparison to linear instability modes / ». The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487844948077581.
Texte intégralLaw, Chi-wing. « The flow structures and Vortex Internation in the subcritical regime in the near wake of a circular cylinder / ». Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20971667.
Texte intégralCarmer, Carl Friedrich v. [Verfasser]. « Shallow turbulent wake flows : momentum and mass transfer due to large-scale coherent vortical structures / von Carl Friedrich v. Carmer ». Karlsruhe : Univ.-Verl. Karlsruhe, 2005. http://d-nb.info/976439034/34.
Texte intégralClemons, Lucas A. « An experimental study of the vortex structures in the wake of a piezoelectric flapping plate for Nano Air Vehicle applications ». [Ames, Iowa : Iowa State University], 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1468074.
Texte intégralNewberry, James. « A Damage Assessment and Wind Loading Analysis of Residential Structures Built Post-1996 in Punta Gorda in the Wake of Hurricane Charley ». Scholar Commons, 2006. http://scholarcommons.usf.edu/etd/3749.
Texte intégralArmaly, Majd. « Dynamics of coherent structures over wind turbine blade ». Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMR005.
Texte intégralThe primary objective of the thesis is to quantitatively assess the dynamic behavior of turbulent airflow around a NACA airfoil as a function of the upstream flow. The upstream flow consists of a family of coherent structures, each with its own distinct temporal and spatial scales. Additionally, this upstream flow may include a mean shear due to a large scale boundary layer. These situations are commonly encountered in wind and marine turbine farms, where the wake generated by one turbine becomes the upstream flow for the next one, and where the atmospheric boundary layer can influence the dynamics of the airfoil’s airflow. Aerodynamic research on wind turbines has primarily focused on the general response of airfoils, and the flow downstream. However, airfoils are not considered yet in an upstream flow with the presence of a family of coherent structures. This study takes into account the spatial and temporal aspects, which is crucial for understanding how efficiently the kinetic energy carried by these coherent motions is captured within the wake. The novelty of the project is to provide a complementary and more detailed analysis of the airfoil-upstream flow interactions based on the analysis of the intermittency of the upstream conditions. This helps to gain insights into the dynamic response ofthe downstream airfoil and the distribution of kinetic energy over the airfoil. To achieve this goal, pressure distributions (coherent structures) must be phase-averaged with a conditioning based on the dynamics of the upstream flow. This type of analysis representsa novel approach and requires the development of specialized methods to be applied to such complex cases. One of the key areas of investigation within the project is the study of the total turbulent kinetic energy (TKE) when the upstream coherent structure packets interact with the downstream airfoil. Additionally, further research can be involved into turbulent kinetic energy, considering the interactions between different components of fluctuations, such as the interactions between coherent and random motion. This thesis work is integrated in the framework of DYNEOL (ANR-17-CE06-0020) project that is funded by the French National Agency of Research (ANR). The project is a collaborative research involving four French laboratories, including the CORIA laboratory
Wu, Xiong-Jian. « Motion and wave load analyses of large offshore structures and special vessels in waves ». Thesis, Brunel University, 1990. http://bura.brunel.ac.uk/handle/2438/7865.
Texte intégralGiacobello, Matteo. « Wake structure of a transversely rotating sphere at moderate Reynolds numbers ». Online version, 2005. http://repository.unimelb.edu.au/10187/2840.
Texte intégralGrice, James Robert. « Prediction of extreme wave-structure interactions for multi-columned structures in deep water ». Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:dd7320c1-7121-4ea7-827f-527af9405e9a.
Texte intégralSomero, John Ryan. « Structure and Persistence of Surface Ship Wakes ». Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/101989.
Texte intégral1
It has long been known that ship wakes are observable by synthetic aperture radar. However, incomplete physical understanding has prevented the development of simulation tools that can predict both the structure and persistence of wakes in the ocean environment, which is critical to understanding both the design and operation of maritime remote sensors as well as providing tactically relevant operational guidance and awareness of the maritime domain. It is the focus of this work to develop an end-to-end multi-scale modeling-and simulation methodology that captures the known physics between the source of disturbance and the sensor. This includes turbulent hydrodynamics, free-surface effects, environmental forcing, generation of surface currents and redistribution of surface-active substances, surface-roughness modification, and simulation of the signature from the ocean surface. The end-to-end methodology is based upon several customized computational fluid dynamics solvers and empirical models. The unsteady Reynolds-averaged Navier-Stokes equations, including models to account for environmental effects and near-surface turbulence, are solved at full-scale on domains that extend tens of kilometers behind the ship. A parametric study is undertaken to explore the effects of ship heading, ship propulsion, ocean-wave amplitude and wavelength, and the relative importance of environmental forcing vs. near-surface turbulence on the generation of surface currents that are transverse to the wake centerline. Due to the environmental forcing, the structure of the persistent wake is shown to be a function of the relative angle between the ambient long-wavelength swell and the ship heading. Ships operating in head seas observe 1-3 streaks, while ships operating in following seas observe 2 symmetric streaks. Ships operating in calm seas generate similar wakes to those in following seas, but with reduced wake width and persistence. In addition to the structure of the persistent wake, the far wake is shown to be dominated by ship-induced turbulence and surface-current gradients generating a wide center wake. The redistribution of surface films by surface currents is simulated using a scalar-transport model on the ocean surface. Simulation of surface-roughness modification is accomplished by solving a wave-action-balance model which accounts for the relative change in the ambient surface profile by the surface currents and the damping-effects of surface-active substances and turbulence. Simulated returns from synthetic aperture radar are generated with two methods implemented. The first method generates a perfect SAR image where the instrument and platform based errors are neglected, but the impact of a randomized ocean field on the radar cross section is considered. The second method simulates the full SAR process including signal detection and processing. Comparisons are made to full-scale field experiments with good agreement between the structure of the persistent wake and observed SAR imagery.
Abdolmaleki, Kourosh. « Modelling of wave impact on offshore structures ». University of Western Australia. School of Mechanical Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0055.
Texte intégralLouis, Stephen. « Continuer à irriguer quand les lacs-réservoirs de barrage souffrent de taux de sédimentation sévères - Recommandations d'amélioration de la gestion du principal canal d'irrigation alimenté par l'ouvrage répartiteur de Canneau (Haïti) ». Doctoral thesis, Universite Libre de Bruxelles, 2019. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/288808.
Texte intégralDoctorat en Sciences agronomiques et ingénierie biologique
info:eu-repo/semantics/nonPublished
Miranda, Joseph A. « The structure of a trailing vortex wake ». Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-01312009-063252/.
Texte intégralAttarian, Vatche. « Long-term structural health monitoring of plate-like structures using distributed guided wave sensors ». Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/24840.
Texte intégralHazell, Jonathan. « New slow wave structures for travelling wave tubes ». Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/59703.
Texte intégralLehmann, Lutz. « Wave propagation in infinite domains : with applications to structure interaction / ». Berlin [u.a.] : Springer, 2007. http://www.gbv.de/dms/bs/toc/523903820.pdf.
Texte intégralMd, Noar Nor. « Wave impacts on rectangular structures ». Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/6609.
Texte intégralSander, Tavallaey Shiva. « Wave propagation in sandwich structures / ». Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3088.
Texte intégralShareef, Mohamed. « Wave overtopping of coastal structures ». Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415752.
Texte intégralSwift, R. H. « Wave forces on coastal structures ». Thesis, Open University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371247.
Texte intégralTopliss, Margaret E. « Water wave impact on structures ». Thesis, University of Bristol, 1994. http://hdl.handle.net/1983/2fa7ba69-7867-4cd0-8b3a-de4de97f98db.
Texte intégralRoe, Eric Allen. « Wave Propagation in Complex Structures ». OpenSIUC, 2010. https://opensiuc.lib.siu.edu/theses/380.
Texte intégralNarisetti, Raj K. « Wave propagation in nonlinear periodic structures ». Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/39643.
Texte intégralXu, Ruo Feng. « Miniaturized guided wave structures and applications ». Thesis, University of Kent, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529405.
Texte intégralKlepsvik, Jonny. « Nonlinear wave loads on offshore structures ». Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36062.
Texte intégralBucca, Steven E. « Wave propagation in lossy waveguide structures ». Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44110.
Texte intégralMaster of Science
Voisey, Ruth. « Multiple wave scattering by quasiperiodic structures ». Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/multiple-wave-scattering-by-quasiperiodic-structures(1c366ad1-443a-4667-9d03-db77487ab1d1).html.
Texte intégralMolinaro, Nicholas Joseph. « The Two Point Correlation Structure of a Cylinder Wake ». Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78296.
Texte intégralMaster of Science
Hart, Douglas P. Acosta Allan J. Brennen Christopher E. « Cavitation and wake structure of unsteady tip vortex flows / ». Diss., Pasadena, Calif. : California Institute of Technology, 1993. http://resolver.caltech.edu/CaltechETD:etd-03272007-131947.
Texte intégralErdozain, Jack Jr. « Long wave infrared structured light ». Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/121664.
Texte intégralThesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 69-72).
3D sensing technologies have been exploited for many applications in autonomous vehicles, manufacturing, and consumer products, however, existing techniques may suer in challenging conditions, where scattering due to fog, dust, or smoke is present. While light in the visible and near IR spectrum are heavily affected by by common scattering mediums, long-wave infrared (also known as thermal IR) experiences less scattering, especially when scattering particles are small. This thesis proposes and demonstrates a structured light scanning approach which operates in the long-wave IR Spectrum. We believe that structured light technique with long-wave IR leads to more robust 3D sensing in some challenging environments. In this thesis the conceptual framework behind the technology is presented, the technology is demonstrated, and testing of long-wave infrared projection is compared to the visible spectrum.
by Jack Erdozain Jr.
M. Eng.
M.Eng. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
Sander, Tavallaey Shiva. « Wave propagation in sandwich structure ». Doctoral thesis, KTH, Vehicle Engineering, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3088.
Texte intégralAkkala, James Marcus. « Flow structure and performance of a flexible plunging airfoil ». Thesis, University of Iowa, 2013. https://ir.uiowa.edu/etd/2433.
Texte intégralChau, Fun-pang. « Numerical methods in wave loading of large offshore structures / ». [Hong Kong] : University of Hong Kong, 1985. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12315916.
Texte intégralLevine, Ross M. « Ultrasonic guided wave imaging via sparse reconstruction ». Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51829.
Texte intégralBeard, Malcolm David. « Guided wave inspection of embedded cylindrical structures ». Thesis, Imperial College London, 2002. http://hdl.handle.net/10044/1/8849.
Texte intégralKhajooeizadeh, Arash. « Metal-insulator-semiconductor (MIS) slow-wave structures ». Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99773.
Texte intégralOakes, Melanie Kathleen. « Violent sea wave impacts on coastal structures ». Thesis, University of East Anglia, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410085.
Texte intégralSharma, Rahul. « Dynamic wave-modes in solar chromospheric structures ». Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/21212/.
Texte intégralLi, Tian. « Spin wave propagation in ferromagnetic nano-structures ». Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263500.
Texte intégral