Дисертації з теми "Bluff bodie"
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Benson, M. "Flow past bluff bodies." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382725.
Повний текст джерелаArmstrong, Brian Jeffrey. "Unsteady flow over bluff bodies." Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/11409.
Повний текст джерелаPolpitiye, Sisira J. "Unsteady fluid flow around certain bluff bodies." Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/34813.
Повний текст джерелаPeers, Edward. "Physics-based aeroacoustic modelling of bluff-bodies." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/71651/.
Повний текст джерелаVallès, Brice. "Computational Study of Vortex Shedding Behind Bluff Bodies." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-567.
Повний текст джерелаA computational study of vortex shedding behind bluff bodies is presented. The main focus of this work is the study of vortex shedding and wake flow behaviour behind tapered circular cylinders in the laminar flow regime. However,a stepped circular cylinder in laminar flow as well as uniform circular cylinders in the turbulent flow regime have been investigated as well.
In the laminar flow regime, the flow behaviour behind tapered and stepped circular cylinders is rather different than behind a uniform circular cylinder. Because the tapered and the stepped circular cylinders are three-dimensional objects, as opposed to uniform circular cylinder swhich are nominally two dimensional, secondary flows are generated along the cylinder span causing complex three-flow patterns which are stil not completely understood. The main motivation of the thesis is thus to contribute to improve knowledge of vortex shedding phenomena.
This thesis is consists of two main parts. Firstly, a brief description of the work is given, as well as the numerical tools used, the vortex shedding phenomenon in laminar and turbulent flow regimes. In addition some of the results are presented. Secondly, the appendices in which published and submitted papers on the subject are enclosed. The aim of the first part is to provide details and/or questions which are not included in the later papers in order to form a more comprehensive document.
Paper III reprinted with kind permission of Elsevier, sciencedirect.com
Narasimhamurthy, Vagesh D. "Wake dynamics of flow past tapered bluff bodies." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2324.
Повний текст джерелаVernet, Julie A. "Plasma actuators for separation control on bluff bodies." Doctoral thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-203208.
Повний текст джерелаORAZI, MATTEO. "Bluff Bodies Flow Control using Innovative Piezoelectric Actuators." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2562349.
Повний текст джерелаSARDU, COSTANTINO. "Active flow control around simplified 3D bluff bodies." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2676916.
Повний текст джерелаMushyam, Aditya. "Effects of flow control on flow past bluff bodies." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398031.
Повний текст джерелаL'objectiu de aquesta tesi doctoral, "Effects offlow control on flow past bluff bodies", és estudiar i analitzar els efectes del control de flux sobre diferents aspectes del flux al voltant de cossos genèrics, Bluff bodies. Les tècniques de control de flux estan en la actualitat sota recerca a nivell mundial, doncs és necessari estudiar l'efectivitat del flux aportat sobre les propietats i els patrons vermiculars del corrent de flux principal. El present treball està inspirat en la indústria del automòbil, així l’anàlisi del flux sobre un esgraó o be una superfície inclinada, ha de permetre entendre les característiques de l'estela de flux a la part del darrera de un vehicle automòbil. Aquest estudi es especialment rellevant quan es considera que una quantitat important de l'energia necessària per desplaçar un vehicle es dissipa gràcies a les estructures vorticulars formades a la part de darrera del vehicle. En aquesta tesi s'han examinat diverses possibilitats de aplicació de les tècniques de control actiu de flux per millorar la efectivitat a l'hora de incrementar la eficiència aerodinàmica sobre cossos genèrics, Bluff bodies. La finalitat bàsica de aquest estudi, és reduir les forces de arrossegament sobre cossos genèrics, gràcies a la determinació de la tècnica de control de fluid més efectiva i la seva implementació pràctica. Dues tècniques diferents de control actiu de fluid han sigut avaluades en aquesta tesi, la definida per un actuador amb flux net nul, "Zero Not Mass Flow Actuator", i la definida per la utilització de un actuador amb un flux net positiu, o be actuador fluídic, "Fluidic Actuator". Les característiques de la capa límit laminar i turbulenta han sigut analitzades així com la efectivitat del control de flux respecte el desplaçament aigües avall del despreniment de la capa límit. Tots els programes utilitzats per toles les simulacions numèriques han sigut creats per el autor de la tesi en llenguatge C, per el que fa referència a les simulacions tridimensionals en règim turbulent, el model de turbulència LES implementat
Heatlie, Fiona. "Turbulent flow around bluff bodies at the floodplain edge." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/8517.
Повний текст джерелаNichols, A. R. "Vortex shedding from two rectangular bluff bodies in tandem." Thesis, Teesside University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383278.
Повний текст джерелаHarland, David George. "Unsteady flow around bluff bodies spanning thin rectangular ducts." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/57508.
Повний текст джерелаAssi, Gustavo R. S. "Mechanisms for flow-induced vibration of interfering bluff bodies." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508992.
Повний текст джерелаSaxena, Vivek. "Turbulence distortion around leading edges and its effect on boundary layer." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360934.
Повний текст джерелаWolf, Claus Christian [Verfasser]. "The subsonic near-wake of bluff bodies / Claus Christian Wolf." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/105142805X/34.
Повний текст джерелаCastriotta, Matteo. "Numerical assessment of wind tunnel blockage effects for bluff bodies." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Знайти повний текст джерелаAlomar, Antoni. "Investigation into noise emitted by bluff bodies with large roughness." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/355960/.
Повний текст джерелаWang, Jiaqi. "Aerodynamic performance of bluff bodies with openings on side surface." Kyoto University, 2020. http://hdl.handle.net/2433/253252.
Повний текст джерелаCross, Caleb Nathaniel. "Combustion heat release effects on asymmetric vortex shedding from bluff bodies." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42772.
Повний текст джерелаOwen, John Clifford. "Passive control of vortex shedding in the wakes of bluff bodies." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364563.
Повний текст джерелаHaack, Sarah Jo. "Flow control using plasma and synthetic jet actuators on bluff bodies." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7421.
Повний текст джерелаThesis research directed by: Dept. of Aerospace Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Prosser, Daniel T. "Advanced computational techniques for unsteady aerodynamic-dynamic interactions of bluff bodies." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53899.
Повний текст джерелаLiaw, Kai. "Simulation of flow around bluff bodies and bridge deck sections using CFD." Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/10125/.
Повний текст джерелаMcColgan, Andrew Hamilton. "An experimental investigation into the wake structure of streamlined and bluff bodies." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/358.
Повний текст джерелаHamidy, Eghbal. "The structure of wakes of 3D bluff bodies in proximity to the ground." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/7603.
Повний текст джерелаDarekar, Rupad. "Drag reduction on bluff bodies by the introduction of a wavy stagnation face." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367727.
Повний текст джерелаFrucht, Yaacov I. "High Reynolds number incompressible flow simulation about parachute canopies and similar bluff bodies." Thesis, University of Leicester, 1987. http://hdl.handle.net/2381/9152.
Повний текст джерелаGreiner, Christopher Mark. "Unsteady hot-wire and hot-film wake measurements of automobile-like bluff bodies." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/42210.
Повний текст джерелаTitle as it appears in the M.I.T. Graduate List, Feb. 1990: Unsteady hot-film and hot-wire wake measurements of automobile-like bluff bodies.
Includes bibliographical references (leaves 213-214).
by Christopher Mark Greiner.
Ph.D.
Hind, Andrew Kenneth. "An investigation into the flow fields around bluff bodies and artificial heart valves." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/15029.
Повний текст джерелаCannon, Steven Cary. "Large-scale structures and the spatial evolution of wakes behind axisymmetric bluff bodies." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/185647.
Повний текст джерелаCampioli, Theresa Lynn. "Assessment of Formulations for Numerical Solutions of Low Speed, Unsteady, Turbulent Flows over Bluff Bodies." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/32141.
Повний текст джерелаMaster of Science
Bhattacharya, Samik Ahmed Anwar. "Effect of three dimensional forcing on the wake of a circular cylinder." Auburn, Ala, 2009. http://hdl.handle.net/10415/1852.
Повний текст джерелаGhadiri, Dehkordi Behzad. "Numerical simulation of the viscous flow around bluff bodies via the random Vortex method." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41598.
Повний текст джерелаThe random vortex method is developed to simulate the flow around a circular cylinder with a splitter plate. A conformal transformation is used to map the cylinder with a splitter plate to a unit circular cylinder. The force coefficients and Strouhal number are presented for various lengths of the splitter plate and are in good agreement with experiments.
The random vortex method has also been developed for the flow around a circular cylinder vibrating transverse to the flow in a channel. The results are presented for various values of Reynolds number, forcing frequency and vibration amplitudes. The effect of blockage on the drag coefficient is presented. The drag coefficient and vortex shedding frequency are shown to compare favourably with experimental results. The flow around a vibrating cylinder with a splitter plate is also simulated. The results are presented for various values of forcing frequency and lengths of the splitter plate.
The flow around multiple stationary cylinders is also simulated. Also, results are presented for the flow around two cylinders, one of which is forced to oscillate in a transverse direction. The numerical results of Strouhal number are in reasonable agreement with experiments.
Khan, Tahir Saeed. "Stabilizing lattice Boltzmann simulation of flows past bluff bodies by introduction of Ehrenfests' limiters." Thesis, University of Leicester, 2011. http://hdl.handle.net/2381/9173.
Повний текст джерелаCorlett, Anne Emily. "A near wake study of vortex shedding from bluff bodies at low Reynolds numbers." Thesis, University of Edinburgh, 1996. http://hdl.handle.net/1842/13465.
Повний текст джерелаKao, Shiung-po. "Modified source-type flame model and vorticity generated by the flame and bluff bodies." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/37751.
Повний текст джерелаPh. D.
Clapperton, Surfleet Ben Lewis. "Drag reduction of bluff bodies by passive control of boundary layer transition and separation." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/48456.
Повний текст джерелаIkram, Zaheer. "Numerical investigation of the effects of free-surface flow past submerged bluff and streamlined bodies." Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8477.
Повний текст джерелаVlachos, Pavlos P. "An Experimental Spatio-Temporal Analysis of Separated Flows Over Bluff Bodies Using Quantitative Flow Visualization." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28675.
Повний текст джерелаPh. D.
Dahan, Jeremy. "Linear feedback control for form-drag reduction on bluff bodies with a blunt trailing edge." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11594.
Повний текст джерелаTrip, Renzo. "An experimental study on the wake behind a rectangular forebody with variable inlet conditions." Licentiate thesis, KTH, Strömningsfysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-142859.
Повний текст джерелаQC 20140312
Trein, Cristiano Augusto. "Study on the Unsteady Pressure Characteristics of Bluff Bodies focusing on Flutter Stabilization of Long-Span Bridges." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/85380.
Повний текст джерелаKyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第14914号
工博第3141号
新制||工||1471(附属図書館)
27352
UT51-2009-M828
京都大学大学院工学研究科社会基盤工学専攻
(主査)教授 白土 博通, 教授 杉浦 邦征, 教授 河井 宏允
学位規則第4条第1項該当
Cazzonato, Guilherme. "Modelagem matemática do escoamento turbulento em canal axissimétrico: uma abordagem com software livre." reponame:Repositório Institucional da UNIJUI, 2016. http://bibliodigital.unijui.edu.br:8080/xmlui/handle/123456789/3629.
Повний текст джерела85 f.
Fallenius, Bengt E. G. "Experimental design and vortex analyses in turbulent wake flows." Doctoral thesis, KTH, Strömningsfysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-46203.
Повний текст джерелаQC 20111108
Active control of vortex shedding behind bluff bodies
Pantalone, Matteo. "Simulation techniques for the aerodynamic study of automotive components." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Знайти повний текст джерелаPiccoli, Guilherme Luiz. "Análise numérica na Engenharia do Vento Computacional empregando computação de alto desempenho e simulação de grandes escalas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17561.
Повний текст джерелаDevelopment of a system to solve problems related to Computational Wind Engineering is the main aim of this work. In order to treat turbulent structures, Large Eddy Simulation is employed. This methodology compute directly scales governing local flow dynamics (large eddies) and it use models to solve those with universal character (small eddies). In this study, the sub-grid effects are considered using the standard Smagorinsky model. In the numerical analysis, hexahedral finite elements are used and a formulation based on the governing equations of quasi-compressible flows. To reduce the computational memory request, explicit schemes to solve the equations system are used. In order to reduce CPU time, an algorithm developed by [Petry, 2002] is evaluated and high-performance techniques aiming to accelerate the problem solution are studied. Thus, it is showed a comparison between dynamic and static allocations of vectors and matrices associated to the implementation of shared-memory parallelization using OpenMP directives. The speed up verification is developed simulating the flow around an immersed bluff body. As a consequence of the techniques employed here, an acceleration of approximately five times with respect of the original computational code is obtained. An important difficulty in the external flow evaluation is the numerical solution of convection dominated flows. The Taylor-Galerkin explicit-iterative scheme, (originally used by the program), which was validated for confined flows, did not present good results for external flows simulations and pressure field perturbations were observed. These instabilities were persevered even in an alternative version, where interpolations functions with the same order were used to compute velocity and pressure (in the original version, constant pressure field at element level were employed). To analyze unbounded flows accurately, a two-step explicit scheme using velocity and pressure interpolation functions with the same order was implemented. This configuration presented physical results with good quality and achieve an important reduction in the processing time. After identification of the best alternative without perturbations of the pressure field, the numerical simulation of the flow around a two-dimensional square cylinder was investigated favoring velocity, pressure and total kinetic energy evaluations along the mid line of the domain and in the obstacle vicinity. These evaluations were effectuated with uniform and stretched meshes for a Reynolds number equal to 22000.
Haffner, Yann. "Manipulation of Three-Dimensional Turbulent Wakes for Aerodynamic Drag Reduction Mechanics of bluff body drag reduction during trnasient near wake reversals Unsteady Coanda Effect and Drag Reduction of a Turbulent Wake Manipulation of Three-Dimensional Asymmetries of a Turbulent Wake for Drag Reduction Large-Scale Asymmetries of a Turbulent Wake: Insights and Closed-Loop Control for Drag Reduction." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0006.
Повний текст джерелаCombination of passive and active flow control are used to experimentally reduce the aerodynamic drag produced by the turbulent wake past a simplified vehicle geometry with a blunt base. Such wakes are characterized by two main features: important pressure drag linked to the massive flow separation, and large-scale asymmetries. The latter,manifesting as bi-modal dynamics or permanent symmetry-breaking, are shown to contribute for around 10% of the pressure drag. The study of the transient wake reversais occurring in bi-modal dynamics though symmetric states enables to isolate the flow mechanism responsible for increased drag in symmetry-breaking states. An interaction and coupling between the recirculating flow from one side and the shear-layer from opposite side peculiar to symmetry-breaking states triggers shear-layer instabilities and their amplification leading to increased flow entrainment and drag.This mechanism is shown to be characteristic of the wakes of blunt bodies.An active flow control strategy combining tangential pulsed jets along the trailing-edges and small flush-mounted curved surfaces is used to reduce the pressure drag of the geometry. The flow reattachment and separation on thecurved surfaces results in a fluidic boat-tailing of the wake leading to drag reductions up to 12%, independently of the unforced large-scale asymmetry of the wake, and is noticeably influenced by the time-scale of unsteadiness of the forcing. Careful combination between forcing time-scale and size of the curved surfaces is needed to achieve ail thepotential of this unsteady Coanda effect in drag reduction as shown from a simple flow model providing scaling laws of the phenomenon. The model provided allows for an extension of the flow control mechanism to separated flows moregenerally. Furthermore, forcing along only selected edges enables to interact with the large-scale wake asymmetries and has very different impact on the drag depending on the unforced wake equilibrium. Symmetrisation of the wake through asymmetric forcing leads to 7% drag reduction at a reduced energetic cost. Key ingredients are provided to adapt forcing strategies for drag reduction in presence of various wake asymmetries. As global wake equilibrium changes result from minor geometric and flow conditions changes, adaptive and robust flow control strategies are essential for industrial automotive applications
Coelho, Jairo Fernando de Lima. "Desenvolvimento de uma instalação experimental para estudo de fenômenos de interação fluido-estrutura." reponame:Repositório Institucional da FURG, 2008. http://repositorio.furg.br/handle/1/3437.
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O estudo experimental de problemas de interação fluido-estrutura é de fundamental importância para o entendimento dos processos dinâmicos envolvidos. Esses processos podem ser bastante complexos em função da alta não-linearidade do problema, especialmente para os casos em que o acoplamento entre a dinâmica do fluido e a dinâmica da estrutura é forte, ou para casos em que ocorram instabilidades dinâmica tanto no fluido quanto na estrutura. O estudo experimental de fenômenosde interação fluido-estrutura necessita de instalações de laboratório capazes de impor movimento relativo entre o fluido e a estrutura. Neste contexto, nesta dissertação apresentam-se o projeto, a construção e a avaliação de um canal de reboque otimizado para o estudo da interação fluido-estrutura em corpos rombudos cilíndricos de alta razão de aspecto. A instalação consiste de um canal de 16 m de comprimento com seção transversal 0,71m de largura por 0,79 m de altura e de uma plataforma de reboque para movimento da estrutura sobre o fluido. Além do movimento retilíneo, a plataforma de reboque é capaz de impor, simultaneamente, movimentos oscilatórios em até dois grupos de estruturas de forma independente. Esta capacidade permite o estudo da influência da amplitude, da freqüência e da fase do movimento oscilatório na interação entre o fluido e as estruturas. A dissertação contém uma discussão sobre a formulação geral dos problemas de interação fluido-estrutura e os principais parâmetros adimensionais relevantes. São tratados os problemas específicos da instalação experimental tais como especificação dos parâmetros hidrodinâmicos, projeto das estruturas de suporte do canal e da plataforma de reboque, o projeto mecânico da plataforma de reboque e uma breve descrição do sistema de controle dos movimentos da plataforma, bem como apresentam-se a descrição dos ensaios de avaliação de desempenho do sistema e a discussão dos resultados. Finalmente, a dissertação apresenta as conclusõesdos aspectos construtivos e capacidade da instalação em uma faixa do número de Reynolds, bem como as sugestões para trabalhos futuros.
The experimental study of fluid-structure interaction problems is of fundamental importance for the understanding of the dynamic phenomena involved. The dynamics of these phenomena can be very complex as a result of the high non-linearity of the problem, in particular for the cases with strong coupling between the dynamic of the fluid and the dynamic of the structure, or in cases in which instabilities in the fluid or in the structure are present. The experimental study of fluid-structure interaction requires laboratory facilities capable of impose relative motion between the fluid and the structure. In this context, that work presents the design, the construction and the evaluation of a towing canal optimized for the study of the interaction fluid-structure in cylindrical bluff bodies of high aspect ratio. The facility consists of 16 m long canal with cross section 0.71 m of width by 0.79 m of height and a towing platform for the motion of the structure in the fluid. In addition to the linear motion, the towing platform is capable of impose simultaneously independent transverse oscillatory motion in up to two structure groups. This capacityallows the study of the influence of the amplitude, of the frequency and of the phase of the oscillatory motion in the interaction between the fluid and the structure. This work presents a discussion on the general formulation of the fluid-structure interaction problems and on the main dimensionless parameters that are relevant to the problem. Next, it deals with the specification of the experimental facility such as hydrodynamic parameters, design of structures for supporting the canal itself and the towing platform, the mechanical design of the towing platform and a brief description of the system of control of the towing platformmotions. Next, it presents the description of the evaluation tests for the platform performance and the discussion of the results. Finally, the work presents the conclusions of the aspects of capacity building and installation on a range of Reynolds number, as well as suggestions for future work.
de, Rooy S. C. "Improved efficiencies in flame weeding." Lincoln University, 1992. http://hdl.handle.net/10182/18.
Повний текст джерела