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Дисертації з теми "Boundary layer"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 25 липня 2025

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1

Giannetti, Flavio. "Boundary layer receptivity." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620646.

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2

Brotherton-Ratcliffe, Rupert Victor. "Boundary-layer effects in liquid-layer flows." Thesis, University College London (University of London), 1987. http://discovery.ucl.ac.uk/1317966/.

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In this thesis we describe various regimes of practical and theoretical significance that arise in the laminar two-dimensional flow of a layer of an incompressible viscous fluid over a solid surface at high Reynolds number. In Part I we consider steady flows over a distorted rigid surface. Almost uniform flows are considered first, when the distortion is sufficient to provoke a viscous-inviscid interaction, and therefore boundary-layer separation. The two cases of supercritical and subcritical flow have quite distinct features, and are discussed separately. The governing equations in each case

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3

Yuile, Adam. "Swept boundary layer transition." Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/14613/.

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Boundary layer transition has been investigated for incompressible three-dimensional mean flows on a flat plate with a 60° swept leading edge for a nominally zero, a positive, and a negative pressure gradient for three freestream turbulence intensities using a low speed blower tunnel with a 1.22 x 0.61 m working section at the University of Liverpool. The freestream turbulence intensities were generated using grids upstream of the leading edge, producing turbulence levels of approximately 0.2 %, 1.25 % and 3.25 %. For each of these nine (3 x 3) test cases detailed boundary layer traverses were

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4

Kral, Linda Dee. "Numerical investigation of transition control of a flat plate boundary layer." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184621.

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A numerical model has been developed for investigating boundary layer transition control for a three-dimensional flat plate boundary layer. Control of a periodically forced boundary layer in an incompressible fluid is studied using surface heating techniques. The spatially evolving boundary layer is simulated. The Navier-Stokes and energy equations are integrated using a fully implicit finite difference/spectral method. The Navier-Stokes equations are in vorticity-velocity form and are coupled with the energy equation through the viscosity dependence on temperature. Both passive and active met

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5

Andersson, Paul. "Modelling of boundary layer stability." Doctoral thesis, KTH, Mechanics, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2888.

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6

Vogl, Stefanie. "Tropical Cyclone Boundary-Layer Models." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-102740.

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7

Graham, William Richard. "Boundary-layer noise and vibration." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308331.

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8

Lea, Adam Stuart Robert. "Boundary layer flow over hills." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400175.

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9

Riley, S. "Three-dimensional boundary layer transition." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356291.

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10

Gardiner, I. D. "Transition in boundary layer flows." Thesis, University of Abertay Dundee, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376973.

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Анотація:

An experimental investigation of transition in boundary layer flows under the influence of various freestream conditions is described. Velocity profiles are obtained automatically by means of a stepper-motor driven traverse mechanism which carries a hot wire probe connected to a constant temperature anemometer and associated instrumentation. This was achieved by use of a data acquisition and control facility centred around a microcomputer with a Eurocard rack mounted extension. The automatic boundary layer traverse is software controlled and the data obtained is stored in a disc file for subse

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11

Grimaldi, Margaret Elizabeth. "Roughness-induced boundary layer transition." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/47353.

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12

Dullaway, Scott N. M. "A VHF boundary-layer radar /." Title page, contents and abstract only, 1999. http://web4.library.adelaide.edu.au/theses/09SM/09smd883.pdf.

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13

Ailinger, Kevin Gerard. "Measurements of surface shear stresses under a three-dimensional turbulent boundary layer using oil-film laser interferometry." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-11012008-063040/.

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14

Holloway, Simon. "Remote sensing measurements of the atmospheric boundary layer : development of a nocturnal boundary layer temperature LiDAR." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/remote-sensing-measurements-of-the-atmospheric-boundary-layer-development-of-a-nocturnal-boundary-layer-temperature-lidar(3de0f22b-8165-4c22-b38e-296062b37940).html.

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A LiDAR instrument to monitor the evolution of the urban boundary layer capping inversion over Manchester has been developed from a previous instrument. This LiDAR uses a frequency-tripled Nd:YAG laser, operating at low pulse energy but high repetition frequency. Rotational Raman scattering of this laser light is parsed into two channels by narrowband interference filters, before detection by photomultiplier tubes operating in photon-counting mode. The receiving telescope was refocused to operate in the boundary layer, and an interference filter was replaced following modelling work. The calib

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15

Paget, Aaron Christopher. "On determining the hurricane boundary layer." Tallahassee, Florida : Florida State University, 2009. http://etd.lib.fsu.edu/theses/available/etd-11092009-170223/.

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Анотація:

Thesis (M.S.)--Florida State University, 2009.<br>Advisor: Paul Ruscher, Florida State University, College of Arts and Sciences, Dept. of Meteorology. Title and description from dissertation home page (viewed on May 10, 2010). Document formatted into pages; contains xi, 46 pages. Includes bibliographical references.

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16

Högberg, Markus. "Optimal Control of Boundary Layer Transition." Doctoral thesis, KTH, Mechanics, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3245.

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17

Lögdberg, Ola. "Turbulent Boundary Layer Separation and Control." Doctoral thesis, KTH, Linné Flow Center, FLOW, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9821.

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Анотація:

Boundary layer separation is an unwanted phenomenon in most technical applications, as for instance on airplane wings, ground vehicles and in internal flow systems. If separation occurs, it causes loss of lift, higher drag and energy losses. It is thus essential to develop methods to eliminate or delay separation.In the present experimental work streamwise vortices are introduced in turbulent boundary layers to transport higher momentum fluid towards the wall. This enables the boundary layer to stay attached at larger pressure gradients. First the adverse pressure gradient (APG) separation bu

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18

Högberg, Markus. "Optimal control of boundary layer transition /." Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3245.

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19

Berlin, Stellan. "Oblique waves in boundary layer transition." Doctoral thesis, Stockholm, 1998. http://www.lib.kth.se/abs98/berl0529.pdf.

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20

Li, Yong. "Active control of boundary layer instabilities." Thesis, Queen Mary, University of London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413644.

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21

Anderson, Philip Stuart. "Aspects of the Antarctic boundary layer." Thesis, Lancaster University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239832.

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22

Fowler, Alison M. "Assimilation of misplaced boundary layer features." Thesis, University of Reading, 2010. http://centaur.reading.ac.uk/24800/.

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23

Hystad, Ida. "Numerical Modelling of Turbulent Boundary Layer." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26365.

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Most physical problems involving viscous fluid flows are characterized by turbulence where instabilities and large velocity gradients generate fluctuations in the flow field. Towed sonar arrays are exposed to turbulence in the boundary layer formed around the cable. Problems are related to the cable rotating around its own axis due to variations in tension force caused by the towing vehicle. Numerical calculations of a pressure driven flow along a cylinder are performed for the purpose of investigating the turbulent boundary layer around the cable. In this study, the numerical software OpenFOA

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24

Chen, J. M. "Boundary layer resistances of artificial leaves." Thesis, University of Reading, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371436.

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25

Hachem, Farouk H. "Boundary layer transition on concave surfaces." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279702.

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26

Nash, Emma Clare. "Boundary layer instability noise on aerofoils." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337698.

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27

Leoutsakos, George. "Boundary layer transition on concave surfaces." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/47060.

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28

Doyle, Brian Patrick. "Propulsion via buoyancy driven boundary layer." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/87938.

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Анотація:

Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 31).<br>Heating a sloped surface generates a well-studied boundary layer flow, but the resulting surface forces have never been studied in propulsion applications. We built a triangular wedge to test this effect by mounting a resistive heating pad to one of its conducting sloped surfaces. We submerge the wedge within a two-layer water stratification, turn the heater on and track the wedge's motion. We have observe

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29

Sargeant, Matthew Alan. "Boundary layer ingestion for advanced airframes." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612183.

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30

Liu, Yu. "Surface roughness generated boundary layer noise." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612403.

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31

Ozkan, Musa. "Boundary layer transition over rotating disks." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/87170/.

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This thesis summarizes results of a combined numerical and experimental study investigating the effects of surface roughness, and of the geometry of the ow domain (confinement) on the boundary{layer transition over rotating disks. Numerically, a three{dimensional enclosed cavity ow in a rotor{stator flow configuration is simulated. The effects induced by surface roughness of the rotor disk and the effects induced by the stator geometry enclosing the ow domain are investigated. The steady{state velocity pro les of the boundary{layer ow on the rotating disk are obtained, subjected to a linear st

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32

Frank, Donya P. "Wave-Current Bottom Boundary Layer Interactions." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1229087949.

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33

Yahiaoui, Mondher. "Numerical studies in boundary-layer stability /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487848891511753.

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34

Su, Yi-Chung. "Longitudinal vortices in boundary layer transition /." The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488190109870444.

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35

Lögdberg, Ola. "Turbulent boundary layer separation and control /." Stockholm : Mekanik, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9821.

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36

MacKinnon, Andrew David. "VHF Boundary Layer Radar and RASS." Title page, abstract and table of contents, 2001. http://hdl.handle.net/2440/37807.

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This thesis describes the refinements, modifications and additions to a prototype Very High Frequency (VHF) Boundary Layer (BL) Spaced Antenna (SA) radar initially installed at the University of Adelaide's Buckland Park field site in 1997. Previous radar observations of the lowest few kilometres of the atmosphere, in particular the Atmospheric Boundary Layer, have used Ultra-High Frequency (UHF) radars. Unlike VHF radars, UHF radars are extremely sensitive to hydro-meteors and have difficulty in distinguishing clear-air echoes from precipitation returns. The advantages and requirements of usi

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37

Ha, Siew-Mun. "An experimental study of coherent structures in a three-dimensional turbulent boundary layer." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07122007-103942/.

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38

Breitfeld, Oliver. "Improving the performance of aerofoil sections using momentum transfer via a secondary flow." Thesis, University of South Wales, 2002. https://pure.southwales.ac.uk/en/studentthesis/improving-the-performance-of-aerofoil-sections-using-momentum-transfer-via-a-secondary-flow(a3627a17-2b56-4e3a-9c73-64e0e105f3d6).html.

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Aerodynamic flow control can improve aerofoil performance by influencing the natural growth of boundary layers, which develop on the surface of vehicles moving in viscous fluids. Many active and passive techniques have been developed to reduce drag and/or increase the lift of aerofoil sections. The work presented in this thesis is concerned with the active excitation of the boundary layer on the suction side of aerofoil sections through momentum transfer via a secondary flow. The secondary flow was achieved by air passing through an air breathing device (ABD) which was implemented in the aerof

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39

Halatchev, Iordan Atanassov. "Hydrodynamic stability of boundary-layer flows in the presence of mass transfer." Title page, contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phh157.pdf.

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Bibliography: leaves 201-207. This thesis presents studies of the non-linear mass-transfer kinetics and a linear analysis of the hydrodynamic stability of systems under conditions of intense interfacial mass transfer.

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40

Blay, Carreras Estel. "Transitional periods of the atmospheric boundary layer." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/277380.

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The atmospheric boundary layer is the part of the troposphere influenced by the presence of the surface, and where most weather phenomena occur. During the day, with fair weather conditions, a convective boundary layer exists. In contrast, during the night, a stable boundary layer appears. It is important to note that the evolution from a convective boundary layer to a stable boundary layer and vice versa happens through two transitional processes. Due to its complexity and the rapid variability, there is a lack of studies about the morning or afternoon/evening transitions. This thesis wants

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41

Hubrich, Klaus. "Highly loaded compressor with boundary layer suction /." Lausanne : EPFL, 2005. http://library.epfl.ch/theses/?nr=3237.

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42

Schafer, Robert. "Tropical island boundary layer structure and development /." [Sydney : University of Technology, Sydney], 1998. http://grison.colorado.edu/Robert/paper/phd.pdf.

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43

Teakle, Ian Alan Lester. "Coastal boundary layer and sediment transport modelling /." [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19317.pdf.

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44

Orton, Nigel Paul. "Boundary Layer Energy Transport in Plasma Devices." NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000427-184805.

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<p>The purpose of this research was to develop a model of boundary-layer energy transport in electric launchers, and perform a numerical simulation to investigate the influence of turbulence, thermal radiation and ablation on energy flux to plasma-facing surfaces. The model combines boundary-layer conservation equations with a k-omega turbulence model and multi-group radiation transport, and uses plasma models for fluid properties such as viscosity, thermal conductivity and specific heat capacity. The resulting TURBFIRE computer code is the most comprehensive simulation to date of boundary-lay

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45

Miller, Teresa S. "Turbulent boundary layer models for acoustic analysis." Diss., Wichita State University, 2011. http://hdl.handle.net/10057/3933.

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An analysis of the three types of turbulent boundary layer (TBL) models for acoustic analysis is presented because current preferred models over-predict TBL contributions to aircraft interior noise predictions. The mean square pressure is a measure of the total energy due to the pressure fluctuations beneath a turbulent boundary layer. The single point wall pressure spectrum sorts the energy into frequencies. The normalized wavenumber-frequency spectrum sorts the energy into wavenumbers. The pressure fluctuations beneath a turbulent boundary layer are found by solving the Poisson equation. In

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46

Dyachenko, Evgueniya, and Nikolai Tarkhanov. "Degeneration of boundary layer at singular points." Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/6013/.

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We study the Dirichlet problem in a bounded plane domain for the heat equation with small parameter multiplying the derivative in t. The behaviour of solution at characteristic points of the boundary is of special interest. The behaviour is well understood if a characteristic line is tangent to the boundary with contact degree at least 2. We allow the boundary to not only have contact of degree less than 2 with a characteristic line but also a cuspidal singularity at a characteristic point. We construct an asymptotic solution of the problem near the characteristic point to describe how the bou

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47

Shaikh, F. N. "Turbulent spots in a transitional boundary layer." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319596.

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48

Moller, Sarah Julia. "Nitrogen oxides in the remote boundary layer." Thesis, University of York, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.535054.

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49

Boutle, Ian. "Boundary-Layer Processes in Mid-latitude Cyclones." Thesis, University of Reading, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520124.

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50

Harvey, Natalie Jane. "Boundary-layer type classification and pollutant mixing." Thesis, University of Reading, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.654495.

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