Дисертації з теми "Turbulent Boundary Layer (TBL)"
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Nironi, Chiara. "Concentration fluctuations of a passive scalar in a turbulent boundary layer." Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00964852.
Повний текст джерелаZhang, Yufang. "Coupled convective heat transfer and radiative energy transfer in turbulent boundary layers." Phd thesis, Ecole Centrale Paris, 2013. http://tel.archives-ouvertes.fr/tel-00969159.
Повний текст джерелаBen, Nasr Ouissem. "Numerical simulations of supersonic turbulent wall-bounded flows." Phd thesis, INSA de Rouen, 2012. http://tel.archives-ouvertes.fr/tel-01059805.
Повний текст джерелаLiu, Bilong. "Acoustical Characteristics of Aircraft Panels." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4102.
Повний текст джерелаMa, Wei. "Experimental investigation of corner stall in a linear compressor cascade." Phd thesis, Ecole Centrale de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00728374.
Повний текст джерелаLögdberg, 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.
Повний текст джерелаQC 20100825
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.
Повний текст джерелаLögdberg, 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.
Повний текст джерелаMiller, Teresa S. "Turbulent boundary layer models for acoustic analysis." Diss., Wichita State University, 2011. http://hdl.handle.net/10057/3933.
Повний текст джерелаDissertation (Ph.D.)--Wichita State University, College of Engineering, Dept. of Aerospace Engineering
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.
Повний текст джерелаBelcher, Stephen E. "Turbulent boundary layer flow over undulating surfaces." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279606.
Повний текст джерелаWikramanayake, Palitha Nalin. "Turbulent wave-current bottom boundary layer flows." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/14353.
Повний текст джерелаBrereton, Ashley. "Phytoplankton aggregations in a turbulent boundary layer." Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/15833/.
Повний текст джерелаLögdberg, Ola. "Vortex generators and turbulent boundary layer separation control." Licentiate thesis, KTH, Mechanics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4152.
Повний текст джерелаBoundary layer separation is usually an unwanted phenomenon in most technical applications as for instance on airplane wings, on ground vehicles and in internal flows such as diffusers. If separation occurs it leads to loss of lift, higher drag and results in energy losses. It is therefore important to be able to find methods to control and if possible avoid separation altogether without introducing a too heavy penalty such as increased drag, energy consuming suction etc.
In the present work we study one such control method, namely the use of vortex generators (VGs), which are known to be able to hinder turbulent boundary layer separation. We first study the downstream development of streamwise vortices behind pairs and arrays of vortex generators and how the strength of the vortices is coupled to the relative size of the vortex generators in comparison to the boundary layer size. Both the amplitude and the trajectory of the vortices are tracked in the downstream direction. Also the influences of yaw and free stream turbulence on the vortices are investigated. This part of the study is made with hot-wire anemometry where all three velocity components of the vortex structure are measured. The generation of circulation by the VGs scales excellently with the VG blade height and the velocity at the blade edge. The magnitude of circulation was found to be independent of yaw angle.
The second part of the study deals with the control effect of vortex generators on three different cases where the strength of the adverse pressure gradient (APG) in a turbulent boundary layer has been varied. In this case the measurements have been made with particle image velocimetry. It was found that the streamwise position where the VGs are placed is not critical for the control effect. For the three different APG cases approximately the same level of circulation was needed to inhibit separation. In contrast to some previous studies we find no evidence of a universal detachment shape factor H12, that is independent of pressure gradient.
Lögdberg, Ola. "Vortex generators and turbulent boundary layer separation control /." Stockholm : Department of Mechanics, Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4152.
Повний текст джерелаRenoud, Robert W. "Boundary layer response to an unsteady turbulent environment." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22931.
Повний текст джерелаErm, Lincoln. "Low-Reynolds-number turbulent boundary layers /." Connect to thesis, 1988. http://eprints.unimelb.edu.au/archive/00000226.
Повний текст джерелаMackerrell, O. S. "Some hydrodynamic instabilities of boundary layer flows." Thesis, University of Exeter, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381355.
Повний текст джерелаHernandez, Medina Santiago. "Turbulent interface phenomena in a temporally developing boundary layer." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14721/.
Повний текст джерелаSkote, Martin. "Studies of turbulent boundary layer flow throughdirect numerical simulation." Doctoral thesis, KTH, Mechanics, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3089.
Повний текст джерелаAngele, Kristian. "Experimental studies of turbulent boundary layer separation and control." Doctoral thesis, KTH, Mechanics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3565.
Повний текст джерелаThe object ofthe present work is to experimentally study thecase ofa turbulent boundary layer subjected to an AdversePressure Gradient (APG) with separation and reattachment. Thisconstitutes a good test case for advanced turbulence modeling.The work consists ofde sign of a wind-tunnel setup, developmentofP article Image Velocimetry (PIV) measurements and evaluationtechniques for boundary layer flows, investigations ofs calingofb oundary layers with APG and separation and studies oftheturbulence structure ofthe separating boundary layer withcontrol by means ofs treamwise vortices. The accuracy ofP IV isinvestigated in the near-wall region ofa zero pressure-gradientturbulent boundary layer at high Reynolds number. It is shownthat, by careful design oft he experiment and correctly appliedvalidation criteria, PIV is a serious alternative toconventional techniques for well-resolved accurate turbulencemeasurements. The results from peak-locking simulationsconstitute useful guide-lines for the effect on the turbulencestatistics. Its symptoms are identified and criteria for whenthis needs to be considered are presented. Different velocityscalings are tested against the new data base on a separatingAPG boundary layer. It is shown that a velocity scale relatedto the local pressure gradient gives similarity not only forthe mean velocity but also to some extent for the Reynoldsshear-stress. Another velocity scale, which is claimed to berelated to the maximum Reynolds shear-stress, gives the samedegree of similarity which connects the two scalings. However,profile similarity achieved within an experiment is notuniversal and this flow is obviously governed by parameterswhich are still not accounted for. Turbulent boundary layerseparation control by means ofs treamwise vortices isinvestigated. The instantaneous interaction between thevortices and the boundary layer and the change in the boundarylayer and turbulence structure is presented. The vortices aregrowing with the boundary layer and the maximum vorticity isdecreased as the circulation is conserved. The vortices arenon-stationary and subjected to vortex stretching. Themovements contribute to large levels ofthe Reynolds stresses.Initially non-equidistant vortices become and remainequidistant and are con- fined to the boundary layer. Theamount ofi nitial streamwise circulationwas found to be acrucial parameter for successful separation control whereas thevortex generator position and size is ofseco ndary importance.At symmetry planes the turbulence is relaxed to a nearisotropic state and the turbulence kinetic energy is decreasedcompared to the case without vortices.
Keywords:Turbulence, Boundary layer, Separation,Adverse Pressure Gradient (APG), PIV, control, streamwisevortices, velocity scaling.
Badr, Mohammad Ali. "Shock wave turbulent boundary layer interaction over a protrusion." Thesis, Wichita State University, 2011. http://hdl.handle.net/10057/3942.
Повний текст джерелаThesis (M.S.)--Wichita State University, College of Engineering, Dept. of Aerospace Engineering
Gwilliam, David J. "Separating boundary layer response to an unsteady turbulent environment." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27259.
Повний текст джерелаKral, 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.
Повний текст джерелаHa, 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/.
Повний текст джерелаAhn, Seungki. "Some unsteady features of turbulent boundary layers." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/53090.
Повний текст джерелаMaster of Science
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/.
Повний текст джерелаJohnstone, Henry Webb 1956. "CONFINED JET-INDUCED MIXING AT A DENSITY INTERFACE (TURBULENT, SHEAR FLOW)." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/292003.
Повний текст джерелаÖsterlund, Jens M. "Experimental studies of zero pressure-gradient turbulent boundary layer flow." Doctoral thesis, KTH, Mechanics, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2894.
Повний текст джерелаEfros, Vladislav. "Structure of turbulent boundary layer over a 2-D roughness." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13214.
Повний текст джерелаFerro, Marco. "Experimental study on turbulent boundary-layer flows with wall transpiration." Doctoral thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217125.
Повний текст джерелаGenom att använda sig av genomströmmande ytor, med sugning eller blåsning, kan man relativt enkelt och effektivt påverka ett gränsskikts tillstånd. Genom sin potential att påverka olika strömningsfysikaliska fenomen så som att senarelägga både avlösning och omslaget från laminär till turbulent strömning (genom sugning) eller som att exempelvis minska luftmotståndet i turbulenta gränsskikt och ge kyleffekt (genom blåsning), så har ett otaligt antal studier genomförts på området de senaste decennierna. Trots detta så är den grundläggande förståelsen bristfällig för de strömningsfenomen som inträffar i turbulenta gränsskikt över genomströmmande ytor. Det råder stora meningsskiljaktigheter om de mest elementära strömningskvantiteterna, såsom medelhastigheten, när sugning och blåsning tillämpas även i det mest förenklade gränsskiktsfallet nämligen det som utvecklar sig över en plan platta utan tryckgradient. För att ta fram nya experimentella data på gränsskikt med sugning och blåsning genom ytan så har vi designat en ny experimentell uppställning samt tagit den i bruk.Den genomströmmande ytan spänner över hela bredden av vindtunnelns mätsträcka (1.2 m) och är 6.5 m lång i strömningsriktningen och är därmed betydligt längre än vad som använts i tidigare studier. Detta gör det möjligt att bättre utforska gränsskiktet som utvecklas över ytan i strömningsriktningen. Kvaliteten på den experimentella uppställningen och valda mätprocedurerna har verifierats genom omfattande tester, som även inkluderar benchmarking mot tidigare resultat på turbulenta gränsskikt utan tryckgradient eller blåsning/sugning och på laminära asymptotiska sugningsgränsskikt. De experimentella resultaten på turbulenta gränsskikt med sugning bekräftar för första gången att det är möjligt att experimentellt sätta upp ett turbulent asymptotiskt sugningsgränsskikt där gränsskiktets medelhastighetsprofil blir oberoende av strömningsriktningen och där sugningshastigheten utgör den enda kontrollparametern. Det turbulenta asymptotiska sugningsgränsskiktet visar sig ha en medelhastighetsprofil normalt mot ytan med en lång logaritmisk region och utan förekomsten av en yttre vakregion. Om man använder yttre skalning av medelhastigheten, med friströmshastigheten och gränsskiktstjockleken som karaktäristisk hastighet respektive längdskala, så kan det logaritmiska området beskrivas med en lutning på Ao=0.064 och ett korsande värde med y-axeln på Bo=0.994, som är oberoende av sugningshastigheten. Om sugningshasigheten normaliserad med friströmshastigheten överskrider värdet 3.70x10^-3 så återgår det ursprungligen turbulenta gränsskiktet till att vara laminärt. Sugningen genom väggen dämpar hastighetsfluktuationerna i gränsskiktet med upp till 50-60% vid direkt jämförelse av det inre toppvärdet i ett turbulent gränsskikt utan sugning och vid jämförbart Reynolds tal. Denna minskning av turbulent aktivitet verkar härstamma från en ökad stabilitet av hastighetsstråken närmast ytan. Mätningar på turbulenta gränsskikt med blåsning har genomförts för blåsningshastigheter mellan 0.1 och 0.37% av friströmshastigheten och täcker Reynoldstalområdet (10-36)x10^3, med Reynolds tal baserat på rörelsemängds-tjockleken. Vid blåsning genom ytan får man en stark modifiering av formen på hastighetesfördelningen genom gränsskiktet. När blåsningshastigheten ökar så kommer till slut den logaritmiska regionen av medelhastigheten, karaktäristisk för turbulent gränsskikt utan blåsning, att gradvis försvinna. God överens-stämmelse av medelhastighetsprofiler mellan turbulenta gränsskikt med och utan blåsning erhålls för alla Reynoldstal och blåsningshastigheter när profilerna normaliseras med Zagarola-Smits hastighetsskala. Blåsning vid väggen ökar intensiteten av hastighetsfluktuationerna, speciellt i den yttre regionen av gränsskiktet. Vid riktigt höga blåsningshastigheter och Reynoldstal så kommer den yttre toppen av hastighetsfluktuationer i gränsskiktet att överskrida den inre toppen, som i sig gradvis försvinner.
QC 20171101
Zhang, Fan. "The modelling of particle resuspension in a turbulent boundary layer." Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1372.
Повний текст джерелаRichardson, G. A. "Algebraic stress modelling for shock-wave/turbulent boundary-layer interactions." Thesis, Cranfield University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267213.
Повний текст джерелаSilva, Freire Atila P. "An asymptotic approach for shock-wave/turbulent boundary layer interactions." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.330307.
Повний текст джерелаLeung, Andrew Wing Che. "An investigation of three-dimensional shockwave/turbulent-boundary layer interaction." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284191.
Повний текст джерелаSiddons, J. T. "The vertical distribution of phytoplankton in a turbulent boundary layer." Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3018308/.
Повний текст джерелаBarrantes, Analía Inés. "Turbulent boundary layer flow over two-dimensional bottom roughness elements." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42585.
Повний текст джерелаRathnasingham, Ruben. "System identification and active control of a turbulent boundary layer." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10468.
Повний текст джерелаMusgrave, Patrick Francis. "Turbulent Boundary Layer over a Piezoelectrically Excited Traveling Wave Surface." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/97011.
Повний текст джерелаPh. D.
Sen, Mehmet Ali. "Proper Orthogonal Decomposition Methodology to Understand Underlying Physics of Rough-Wall Turbulent Boundary Layer." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/SenMA2007.pdf.
Повний текст джерелаÖlçmen, Semih M. "An experimental study of a three-dimensional pressure-driven turbulent boundary layer /." This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-06062008-172023/.
Повний текст джерелаVita. Abstract. Two computer disks in pocket of volume. Includes bibliographical references (leaves 119-127). Also available via the Internet.
Dasi, Lakshmi Prasad. "Statistical characteristics of turbulent chemical plumes." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/21256.
Повний текст джерелаCoronado, Domenge Patricia X. "Delayed-Detached-Eddy Simulation of Shock Wave/Turbulent Boundary Layer Interaction." Scholarly Repository, 2009. http://scholarlyrepository.miami.edu/oa_theses/220.
Повний текст джерелаDiakoumakos, Elias. "Turbulent boundary layer with heat transfer and periodic free-stream velocity." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46745.
Повний текст джерелаMitchell, G. "Interaction of a synthetic Jet with a thermal turbulent boundary layer." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492487.
Повний текст джерелаHood, Innes William. "Turbulent natural convection coupled with thermal radiation in a boundary layer." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27887.
Повний текст джерелаApplied Science, Faculty of
Mechanical Engineering, Department of
Graduate
Gagné, Jean-François. "An improved method for modelling fully rough turbulent boundary layer flows." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq36888.pdf.
Повний текст джерелаMahmoudnejad, Niloufar. "Numerical simulation of wall-pressure fluctuations due to turbulent boundary layer." Diss., Wichita State University, 2011. http://hdl.handle.net/10057/5151.
Повний текст джерелаThesis (Ph.D.)--Wichita State University, College of Engineering, Dept. of Aerospace Engineering
Pilatis, N. "Turbulent boundary layer prediction in three-dimensional ducts with core vorticity." Thesis, University of Salford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376873.
Повний текст джерелаStretch, D. D. "The dispersion of slightly dense contaminants in a turbulent boundary layer." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377257.
Повний текст джерела