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Relevant bibliographies by topics / Turbulent boundary layer. Particle image velocimetry

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Academic literature on the topic 'Turbulent boundary layer. Particle image velocimetry'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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Journal articles on the topic "Turbulent boundary layer. Particle image velocimetry"

1

DI CICCA, GAETANO MARIA, GAETANO IUSO, PIER GIORGIO SPAZZINI, and MICHELE ONORATO. "Particle image velocimetry investigation of a turbulent boundary layer manipulated by spanwise wall oscillations." Journal of Fluid Mechanics 467 (September 24, 2002): 41–56. http://dx.doi.org/10.1017/s002211200200157x.

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Particle image velocimetry has been applied to the study of a canonical turbulent boundary layer and to a turbulent boundary layer forced by transversal wall oscillations. This work is part of the research programme at the Politecnico di Torino aerodynamic laboratory with the objective of investigating the response of near-wall turbulence to external perturbations. Results are presented for the optimum oscillation period of 100 viscous time units and for an oscillation amplitude of 320 viscous units. As expected, turbulent velocity fluctuations are considerably reduced by the wall oscillations

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Nolan, K. P., and E. J. Walsh. "Particle image velocimetry measurements of a transitional boundary layer under free stream turbulence." Journal of Fluid Mechanics 702 (May 23, 2012): 215–38. http://dx.doi.org/10.1017/jfm.2012.173.

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AbstractHigh-speed particle image velocimetry (PIV) measurements of bypass transition reveal the breakdown of the ubiquitous streaks into turbulent spots. Individual streak velocity profiles are examined and contrasted with the root mean square profiles typically reported. An estimation of streak amplitude based on the modulation of the instantaneous boundary layer thickness is proposed. Examination of the PIV velocity fields shows how turbulent spot precursors, identified with concurrent hot-film recordings, consist of streamwise arrangements of positive and negative streaks. As secondary ins

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CREYSSELS, M., P. DUPONT, A. OULD EL MOCTAR, et al. "Saltating particles in a turbulent boundary layer: experiment and theory." Journal of Fluid Mechanics 625 (April 14, 2009): 47–74. http://dx.doi.org/10.1017/s0022112008005491.

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The work presented here focuses on the analysis of a turbulent boundary layer saturated with saltating particles. Experiments were carried out in a wind tunnel 15m long and 0.6m wide at the University of Aarhus in Denmark with sand grains 242 μm in size for wind speeds ranging from the threshold speed to twice its value. The saltating particles were analysed using particle image velocimetry (PIV) and particle-tracking velocimetry (PTV), and vertical profiles of particle concentration and velocity were extracted. The particle concentration was found to decrease exponentially with the height abo

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Kevin, Kevin, J. P. Monty, H. L. Bai, et al. "Cross-stream stereoscopic particle image velocimetry of a modified turbulent boundary layer over directional surface pattern." Journal of Fluid Mechanics 813 (January 23, 2017): 412–35. http://dx.doi.org/10.1017/jfm.2016.879.

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A turbulent boundary layer developed over a herringbone patterned riblet surface is investigated using stereoscopic particle image velocimetry in the cross-stream plane at $Re_{\unicode[STIX]{x1D70F}}\approx 3900$. The three velocity components resulting from this experiment reveal a pronounced spanwise periodicity in all single-point velocity statistics. Consistent with previous hot-wire studies over similar-type riblets, we observe a weak time-average secondary flow in the form of $\unicode[STIX]{x1D6FF}$-filling streamwise vortices. The observed differences in the surface and secondary flow

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HAMBLETON, W. T., N. HUTCHINS, and IVAN MARUSIC. "Simultaneous orthogonal-plane particle image velocimetry measurements in a turbulent boundary layer." Journal of Fluid Mechanics 560 (July 20, 2006): 53. http://dx.doi.org/10.1017/s0022112006000292.

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Humble, R. A., F. Scarano, and B. W. van Oudheusden. "Particle image velocimetry measurements of a shock wave/turbulent boundary layer interaction." Experiments in Fluids 43, no. 2-3 (2007): 173–83. http://dx.doi.org/10.1007/s00348-007-0337-8.

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Johnson, Blair A., and Edwin A. Cowen. "Turbulent boundary layers absent mean shear." Journal of Fluid Mechanics 835 (November 27, 2017): 217–51. http://dx.doi.org/10.1017/jfm.2017.742.

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We perform an experimental study to investigate the turbulent boundary layer above a stationary solid glass bed in the absence of mean shear. High Reynolds number $(Re_{\unicode[STIX]{x1D706}}\sim 300)$ horizontally homogeneous isotropic turbulence is generated via randomly actuated synthetic jet arrays (RASJA – Variano & Cowen J. Fluid Mech. vol. 604, 2008, pp. 1–32). Each of the arrays is controlled by a spatio-temporally varying algorithm, which in turn minimizes the formation of secondary mean flows. One array consists of an $8\times 8$ grid of jets, while the other is a $16\times 16$

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Keirsbulck, L., L. Labraga, A. Mazouz, and C. Tournier. "Surface Roughness Effects on Turbulent Boundary Layer Structures." Journal of Fluids Engineering 124, no. 1 (2001): 127–35. http://dx.doi.org/10.1115/1.1445141.

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A turbulent boundary layer structure which develop over a k-type rough wall displays several differences with those found on a smooth surface. The magnitude of the wake strength depends on the wall roughness. In the near-wall region, the contribution to the Reynolds shear stress fraction, corresponding to each event, strongly depends on the wall roughness. In the wall region, the diffusion factors are influenced by the wall roughness where the sweep events largely dominate the ejection events. This trend is reversed for the smooth-wall. Particle Image Velocimetry technique (PIV) is used to obt

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Baker, Lucia J., and Filippo Coletti. "Experimental study of negatively buoyant finite-size particles in a turbulent boundary layer up to dense regimes." Journal of Fluid Mechanics 866 (March 13, 2019): 598–629. http://dx.doi.org/10.1017/jfm.2019.99.

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We experimentally investigate the two-phase interplay in an open-channel turbulent boundary layer laden with finite-size particles at global volume fractions between 4 and 25 %. The working fluid (water) and the dispersed phase (hydrogel spheres) have closely matched refractive indices, allowing us to measure the properties of both phases using particle image velocimetry and particle tracking velocimetry, respectively. The particles have a diameter of approximately 9 % of the channel depth and are slightly denser than the fluid. The negative buoyancy causes a strong vertical concentration grad

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Tamano, Shinji, Takuya Kitao, and Yohei Morinishi. "Turbulent drag reduction of boundary layer flow with non-ionic surfactant injection." Journal of Fluid Mechanics 749 (May 15, 2014): 367–403. http://dx.doi.org/10.1017/jfm.2014.225.

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AbstractWe experimentally investigated streamwise variations of turbulent dynamics in drag-reducing turbulent boundary layer flows following the injection of non-ionic surfactant solutions, which mainly consisted of oleyldimethylamine oxide. We focus on the comparison of turbulence statistics between injected (i.e. heterogeneous) and premixed (i.e. homogeneous) surfactant solutions, in which the maximum drag reduction ratio of 50 % is the same at the most downstream position for both cases. The wall-normal profiles of turbulence statistics, such as streamwise and wall-normal turbulence intensi

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Dissertations / Theses on the topic "Turbulent boundary layer. Particle image velocimetry"

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Beresh, Steven Jay. "The effect of the incoming turbulent boundary layer on a shock-induced separated flow using particle image velocimetry /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Clark, Thomas Henry. "Measurement of three-dimensional coherent fluid structure in high Reynolds number turbulent boundary layers." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/243622.

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The turbulent boundary layer is an aspect of fluid flow which dominates the performance of many engineering systems - yet the analytic solution of such flows is intractable for most applications. Our understanding of boundary layers is therefore limited by our ability to simulate and measure them. Tomographic Particle Image Velocimetry (TPIV) is a recently developed technique for direct measurement of fluid velocity within a 3D region. This allows new insight into the topological structure of turbulent boundary layers. Increasing Reynolds Number increases the range of scales at which turbulenc

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Srinath, Sricharan. "Prédiction et modélisation d’écoulements turbulents proche de paroi." Thesis, Ecole centrale de Lille, 2017. http://www.theses.fr/2017ECLI0029/document.

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Le but de ce travail est d'étudier une couche limite soumise à un gradient de pression et de la comparer avec une couche limite de plaque plane à grands nombres de Reynolds. Dans ce cadre, l’accent est mis sur le comportement des structures cohérentes à grande échelle. En raison de leur grande longueur, ces structures ne sont pas faciles à extraire et à caractériser en utilisant des techniques de mesure standard. Pour cette raison, des dispositifs expérimentaux spécifiques utilisant la PIV dans les plans longitudinaux et parallèles à la paroi ont été conçus pour capturer les structures à grand

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Murray, Henry Hall IV. "Turbulence and Sound Generated by a Rotor Operating Near a Wall." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71332.

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Acoustic and aerodynamic measurements have been carried out on a rotor operating in a planar turbulent boundary layer near a wall for a variety of thrust conditions and yaw angles with respect to the inflow. At the highest thrust condition a strong flow reversal in the wall-rotor tip gap was observed. Average velocity fields filtered by the angular position of the rotor show that the flow reversal is fed by jets of fluid that tend to form below the blade as it passes by the wall. Instantaneous velocity measurements show the presence of strong vortices in the tip gap. These vortices were ch

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Gunasekaran, Sidaard. "Relationship Between the Free Shear Layer, the Wingtip Vortex and Aerodynamic Efficiency." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1470231642.

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Das, Shyama Prasad. "An Experimental Study Of Instabilities In Unsteady Separation Bubbles." Thesis, Indian Institute of Science, 2006. http://hdl.handle.net/2005/290.

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The present thesis is an experimental study of some aspects of unsteady two dimensional boundary layers subject to adverse pressure gradient. An adverse pressure gradient usually leads to boundary layer separation or an instability which may result in transition to turbulence. Unsteady boundary layer separation is not yet fully understood and there is no specific criterion proposed in literature for its occurrence. The details of separation depend on the Reynolds number, the geometry of the body (streamlined or bluff) and the type of imposed unsteady motion (impulsive, oscillatory etc.). Simil

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Vrubel, Jan. "Měření rychlosti v dnové mezní vrstvě kanálu použitím rovinné laserové anemometrie." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226141.

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The theme of this thesis is continue on examining relatively commonly used measurement flow field metods, which assessing the variables flows at a high level. Thesis follow up mainly the flow field in the channel bottom boundary-layer and its depending on different factors. To calculate velocity in boundary-layer is common used extrapolation method, because this boundary layer is only the small part of measuring cross section. Increase the accuracy of measurement of flow variables make the flow in the boundary layer also important. Thesis is a summary of a basic theory of flow field, but mainl

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Blackman, Karin. "Interactions multi-échelles entre la basse atmosphère et la canopée urbaine." Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0028.

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La couche limite urbaine est caractérisée par la présence de structures cohérentes complexes, telles que des structures de grande échelle à basse vitesse, et par des processus turbulents intermittents de balayage et d’éjection, responsables du transport de masse, de chaleur et de quantité de mouvement. Ces structures sont bien identifiées qualitativement mais leurs interactions avec les petites structures induites par la présence de la canopée urbaine sont encore mal connues. Afin d'étudier ces interactions, des écoulements de couche limite se développant sur des parois rugueuses sont étudiés

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Godard, Antoine. "Etude numérique et expérimentale d'un compresseur aspiré." Phd thesis, Ecole Centrale de Lyon, 2010. http://tel.archives-ouvertes.fr/tel-00728814.

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Afin d'alléger les moteurs d'avions et diminuer la consommation de carburant, les industriels tendent à rendre plus compact le système de compression de leurs moteurs, qui représente environ 40% de la masse totale. Or, à taux de compression global égal, la réduction du nombre d'étages implique une charge aérodynamique plus élevée par étage. Cela augmente d'autant les risques de décollements sur les aubes et la dégradation des performances. L'aspiration de la couche limite sur les aubages s'est révélée très prometteuse pour supprimer ces décollements néfastes et satisfaire aux besoins de charge

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Steinmann, Thomas. "Métrologie optique en dynamique des fluides appliquées à l'écologie physique des insectes." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4050/document.

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La capacité à percevoir des courants dans un fluide s'est développée chez de nombreuses espèces animales, dans des contextes écologiques très variés qui couvrent aussi bien les interactions proies-prédateurs, la sélection sexuelle ou l'orientation dans un environnement. Parmi ces espèces animales, les grillons détectent les courants d'air générés notamment lors de l'attaque de leurs prédateurs à l'aide de deux organes appelés "cerques", situés à l'arrière de leur abdomen et recouverts de poils mécano-sensoriels. Ces senseurs sont considérés comme les détecteurs les plus sensibles du monde anim

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Books on the topic "Turbulent boundary layer. Particle image velocimetry"

1

Fischer, Markus. Untersuchung kunstlich angeregter Instabilitaten in einer zweidimensionalen laminaren Grenzschichtstromung mit Hilfe der Particle Image Velocimetry. DLR, 1993.

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Larry, Chew, and United States. National Aeronautics and Space Administration., eds. Laser Doppler vellcimeter measurements of boundary layer velocity and turbulent intensities in MACH 2.5 flow: Final report. University of Central Florida, Dept. of Mechanical and Aerospace Engineering, 1994.

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Larry, Chew, and United States. National Aeronautics and Space Administration., eds. Laser Doppler vellcimeter measurements of boundary layer velocity and turbulent intensities in MACH 2.5 flow: Final report. University of Central Florida, Dept. of Mechanical and Aerospace Engineering, 1994.

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Book chapters on the topic "Turbulent boundary layer. Particle image velocimetry"

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Foucaut, J. M., B. Miliat, N. Perenne, and M. Stanislas. "Characterization of Different PIV Algorithms Using the EUROPIV Synthetic Image Generator and Real images From a Turbulent Boundary Layer." In Particle Image Velocimetry: Recent Improvements. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18795-7_12.

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Atkinson, Callum, Sebastien Coudert, Jean-Marc Foucaut, Michel Stanislas, and Julio Soria. "Tomographic Particle Image Velocimetry Measurements of a High Reynolds Number Turbulent Boundary Layer." In ERCOFTAC Series. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-9603-6_12.

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Kähler, C. J., M. Stanislas, T. Dewhirst, and J. Carlier. "Investigation of the spatio-temporal flow structure in the log-law region of a turbulent boundary layer by means of multi-plane stereo particle image velocimetry." In Laser Techniques for Fluid Mechanics. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-08263-8_3.

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Conference papers on the topic "Turbulent boundary layer. Particle image velocimetry"

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Loureiro, Juliana, Atila Pantaleão Silva Freire, and Leonardo Jose Castellanos Gonzalez. "EXPERIMENTS ON TURBULENT BOUNDARY LAYER SEPARATION USING PARTICLE IMAGE VELOCIMETRY." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-2604.

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Ortiz-Villafuerte, Javier, and Yassin A. Hassan. "Investigation of Microbubble Boundary Layer Using Particle Image Velocimetry." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45639.

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Particle tracking velocimetry has been used to measure the velocity fields of both continuous and dispersed phases, in a microbubble turbulent boundary layer, in a channel flow. Hydrogen and oxygen microbubbles were generated in the flow by electrolysis. The average size of the microbubble radius was 15 μm. Significant drag reductions (above 40%) were observed, when the accumulation of microbubbles took place in a critical zone within the buffer layer. The z-component of the mean vorticity field was derived from the measured velocity fields. There is a decrease in the magnitude of the vorticit

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Meinhart, C., and R. Adrian. "Measurement of the zero-pressure gradient turbulent boundary layer using particle image velocimetry." In 33rd Aerospace Sciences Meeting and Exhibit. American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-789.

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Sugawara, Yoshiki, Takahiro Tsukahara, and Yasuo Kawaguchi. "Multidimensional Measurements of Turbulent Boundary Layer Including Scattered Particles Using PIV Technique." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-32390.

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Although many experimental researches on solid-gas flows have been conducted, the involved stress balance problem has not been elucidated. To have a deep investigation of the stress balance in gas flow with entrained solid particles, this study conducts particle image velocimetry (PIV) experiment on a horizontal turbulent boundary layer. In the experiment, air and micro-scale glass beads are chosen as the gas phase and solid particles, respectively. The velocities of both air and solid particles are obtained simultaneously based on the acquired images and by image processing; each term of the

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Bolton, Johnathan T., Brian S. Thurow, Farrukh S. Alvi, and Nishul Arora. "Volumetric Measurement of a Shock Wave-Turbulent Boundary Layer Interaction Using Plenoptic Particle Image Velocimetry." In 32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-4029.

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Dennis, Kadeem, and Kamran Siddiqui. "Multi-Plane Characterization of the Turbulent Boundary Layer." In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83507.

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The boundary layers are known for their significance in several engineering systems. In particular, the inner region of the turbulent boundary layer has been shown to play a significant role in controlling the dynamics of turbulent structures that are responsible for the transport of mass, heat and momentum. While substantial work has been done in the past to characterize the structure of turbulent flow in this region, the characterization of the three-dimensional turbulent flow structure is limited. This study reports a multi-plane particle image velocimetry (PIV) approach to investigate thre

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Jessen, Wilhelm, Martin Konopka, and Wolfgang Schro¨der. "Particle-Image Velocimetry Measurements of Film Cooling in an Adverse Pressure Gradient Flow." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22411.

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The turbulent flow field of a film cooling flow is investigated using the particle-image velocimetry (PIV) technique. Cooling jets are injected from a multi-row hole configuration into a turbulent boundary layer flow of a flat plate in the presence of a zero and an adverse pressure gradient. The investigations focus on full-coverage film cooling. Therefore, the film cooling configuration consists of three staggered rows of holes with a lateral spacing of p/D = 3 and a streamwise row distance of l/D = 6. The inclined cooling holes feature a fan-shaped exit geometry with lateral and streamwise e

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Uzol, Og˘uz, Xue Feng Zhang, Alex Cranstone, and Howard Hodson. "Investigation of Unsteady Wake-Separated Boundary Layer Interaction Using Particle-Image-Velocimetry." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-28099.

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The current paper presents an experimental investigation of the interaction between unsteady wakes and the separated boundary layer on the suction side of an ultra-high-lift low-pressure turbine airfoil. Two-dimensional Particle Image Velocimetry (PIV) measurements of the unsteady boundary layer over the T106C LP turbine profile were performed in a low speed linear cascade facility, at selected phases of passing wakes. The wakes are created by moving cylindrical bars across the inlet of the test section. Various phenomena were investigated such as separation and transition characteristics, vor

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Dennis, Kadeem, and Kamran Siddiqui. "Characterization of Thermals in a Heated Turbulent Boundary Layer." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5436.

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Abstract The hydrodynamic boundary layer encountered in many practical engineering systems is turbulent in nature and known to play a significant role in governing the induced friction drag and species transport. In turbulent boundary layer flows, heat transfer is often involved which increases flow complexity due to the influence of buoyancy. When the buoyant force is sufficiently large in magnitude, thermals carrying heated fluid are known to detach and rise from the wall. Literature review shows that in mixed convection, thermals have been primarily identified through qualitative flow visua

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Andre, Matthieu A., and Philippe M. Bardet. "Experimental Investigation of Boundary Layer Instabilities on the Free Surface of Non-Turbulent Jet." In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72328.

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Shear instabilities induced by the relaxation of laminar boundary layer at the free surface of a high speed liquid jet are investigated experimentally. Physical insights into these instabilities and the resulting capillary wave growth are gained by performing non-intrusive measurements of flow structure in the direct vicinity of the surface. The experimental results are a combination of surface visualization, planar laser induced fluorescence (PLIF), particle image velocimetry (PIV), and particle tracking velocimetry (PTV). They suggest that 2D spanwise vortices in the shear layer play a major

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