Bibliographies thématiques / Bluff bodie

Littérature scientifique sur le sujet « Bluff bodie »

Auteur : Grafiati
Publié le 1 avril 2023

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Articles de revues sur le sujet "Bluff bodie"

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KIYA, Masaru, Hitoshi ISHIKAWA et Osamu MOCHIZUKI. « Aerodynamics of Three-dimensional Bluff Bodie ». Wind Engineers, JAWE 2000, no 83 (2000) : 11–18. http://dx.doi.org/10.5359/jawe.2000.83_11.

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Herrera, P. A., L. G. Closs et M. L. Silberman. « Alteration and geochemical zoning in Bodie Bluff, Bodie mining district, eastern California ». Journal of Geochemical Exploration 48, no 2 (juillet 1993) : 259–75. http://dx.doi.org/10.1016/0375-6742(93)90007-9.

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Dalbir Singh, Dalbir Singh, M. M. Gaud M.M. Gaud et Jaswinder Singh Jaswinder Singh. « Fundamental Control of Wake Behind Bluff Bodies : A Review ». International Journal of Scientific Research 2, no 8 (1 juin 2012) : 134–35. http://dx.doi.org/10.15373/22778179/aug2013/45.

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Wygnanski, Israel. « ON ACTIVE CONTROL OF SEPARATION FROM BLUFF BODIES(Keynote Lecture) ». Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005) : 15–24. http://dx.doi.org/10.1299/jsmeicjwsf.2005.15.

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Teimourian, Amir, et Hanifa Teimourian. « Vortex Shedding Suppression : A Review on Modified Bluff Bodies ». Eng 2, no 3 (27 juillet 2021) : 325–39. http://dx.doi.org/10.3390/eng2030021.

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Vortex shedding phenomenon behind bluff bodies and its destructive unsteady wake can be controlled by employing active and passive flow control methods. In this quest, researchers employed experimental fluid dynamics (EFD), computational fluid dynamics (CFD) and an analytical approach to investigate such phenomena to reach a desired outcome. This study reviews the available literature on the flow control of vortex shedding behind bluff bodies and its destructive wake through the modification of the geometry of the bluff body. Various modifications on the bluff body geometries namely perforated bluff bodies, permeable and porous mesh, corner modification and wavy cylinder have been reviewed. The effectiveness of these methods has been discussed in terms of drag variation, wake structure modifications and Strouhal number alteration.
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Thompson, Mark C., Thomas Leweke et Kerry Hourigan. « Bluff Bodies and Wake–Wall Interactions ». Annual Review of Fluid Mechanics 53, no 1 (5 janvier 2021) : 347–76. http://dx.doi.org/10.1146/annurev-fluid-072220-123637.

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This review surveys the dramatic variations in wake structures and flow transitions, in addition to body forces, that appear as the motion of bluff bodies through a fluid occurs increasingly closer to a solid wall. In particular, we discuss the two cases of bluff bodies translating parallel to solid walls at varying heights and bluff bodies impacting on solid walls. In the former case, we highlight the changes to the wake structures as the flow varies from that of an isolated body to that of a body on or very close to the wall, including the effects when the body is rotating. For the latter case of an impacting body, we review the flow structures following impact and their transition to three-dimensionality. We discuss the issue of whether there is solid–solid contact between the bluff body and a wall and its importance to body motion.
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Mat Ali, Mohamed Sukri, Sheikh Ahmad Zaki Shaikh Salim, Mohamad Hafz Ismail, Sallehuddin Muhamad et Muhammad Iyas Mahzan. « Aeolian Tones Radiated from Flow Over Bluff Bodies ». Open Mechanical Engineering Journal 7, no 1 (18 octobre 2013) : 48–57. http://dx.doi.org/10.2174/1874155x01307010048.

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Bluff body is a simple but a central shape for many engineering applications. The geometry shape of the bluff body characterises the behaviour of the flow over the bluff body, where a more complex flow structure is found near downstream. Shear layer separation is mainly responsible for the periodic global phenomena, that includes the generation of sound. The magnitude of the aerodynamically generated sound is dominated by the fluctuations of aerodynamics forces, i.e., drag and lift. The study also shows that the sound pressure field is shaped by the aeolian tones that is related strongly to the lift fluctuations of the bluff body. Amplitude and frequency of the fluctuating lift change naturally with the shape of a particular bluff body. Triangular cylinder exhibits the largest sound pressure level (41.9 dB) followed by ellipse and circular shapes. Square cylinder emits the lowest sound pressure level (36.7 dB). This corresponds to the longest downstream vortex formation length at which for a square cylinder the long vortex formation length provides space for more vortex to dissipate.
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Sarioglu, Mustafa, et Tahir Yavuz. « Subcritical Flow Around Bluff Bodies ». AIAA Journal 40, no 7 (juillet 2002) : 1257–68. http://dx.doi.org/10.2514/2.1792.

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Abdullah, Makola M., Kenneth K. Walsh, Shannon Grady et G. Dale Wesson. « Modeling Flow around Bluff Bodies ». Journal of Computing in Civil Engineering 19, no 1 (janvier 2005) : 104–7. http://dx.doi.org/10.1061/(asce)0887-3801(2005)19:1(104).

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Matsumoto, Masaru, Yoshiyuki Daito, Fumitaka Yoshizumi, Yasuo Ichikawa et Tadahiro Yabutani. « Torsional flutter of bluff bodies ». Journal of Wind Engineering and Industrial Aerodynamics 69-71 (juillet 1997) : 871–82. http://dx.doi.org/10.1016/s0167-6105(97)00213-4.

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Thèses sur le sujet "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.

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Armstrong, Brian Jeffrey. « Unsteady flow over bluff bodies ». Thesis, University of Edinburgh, 1985. http://hdl.handle.net/1842/11409.

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Polpitiye, Sisira J. « Unsteady fluid flow around certain bluff bodies ». Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/34813.

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It is shown in this thesis that fluid dynamic forces on unsteadily moving bluff bodies depend on the history of motion as much as on the velocity and acceleration of motion. An empirical relationship between the motion of the body and the resulting force is obtained by analysing the effect of the history of motion on the fluid dynamic force at any instant. The fluid dynamic force, velocity and acceleration are obtained as functions of time, by oscillating test models in water while they are being towed at constant speed. The test models used are: 1. a two-dimensional circular cylinder, 2. a rectangular block with square frontal area and fineness ratio of 3:1, 3. a cruciform parachute canopy with arm ratio of 4:1, and 4. a ring-slot parachute canopy. The functions by which the history of flow affects the future forces, are evaluated by using the Convolution Integral. The results show that the effects due to history of both velocity and acceleration are by no means negligible, that is the velocity and the acceleration at a specific time prior to any instant is so domineering that the fluid dynamic force can approximately be expressed as being delayed by this period of time. This 'time-delay', or time lag (as opposed to phase-lag) in the part of the measured force is found to be independent of the frequency of excitation. In the light of this evidence, a prediction model is suggested for estimating unsteady fluid forces. The data required for the application of this prediction model are obtained experimentally. Chapter One of this thesis gives a brief explanation of the historical background of unsteady fluid dynamics. The effects of acceleration on the fluid dynamic force, in both ideal and real fluids, are discussed in Chapter Two. Explained in Chapter Three are the techniques used for building the force prediction model, and data acquisition. The experimental procedure is explained in Chapter Four. Chapter Five gives the empirical form of the prediction model, and some data that are used in association with this model.
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Peers, Edward. « Physics-based aeroacoustic modelling of bluff-bodies ». Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/71651/.

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In this work physics-based modelling of bluff-body noise was performed with application to landing gear noise production. The landing gear is a primary contributor to airframe noise during approach. Noise is primarily generated from the unsteady pressures resulting from the turbulent flow around various components. The research was initiated in response to the need for an improved understanding of landing gear noise prediction tools. A computational approach was adopted so that the noise generating physics of the problem could be captured. Governing laws were solved numerically to predict the noise source characteristics and the resulting acoustic far-field. Three-dimensional compressible Navier-Stokes simulations were performed to solve the unsteady turbulent near-field flow and the acoustic analogy was used to predict the resulting far-field acoustic pressure. The flow solver included a high-order computational aeroacoustics code adopting large-eddy simulation, whilst a Ffowcs Williams and Hawkings solver was used for the acoustic prediction. Circular cylinders in various configurations were selected to represent basic landing gear struts and results were used to form a modelling database. Initially, cylinders at various Reynolds numbers were investigated in cross-flow to determine the noise characteristics of a simple model strut. The work was extended to investigate the effect of strut alignment to the flow by simulating cylinders in yaw. The effect of yaw was shown to modify the peak level and frequency of far-field noise spectra. Component interaction effects were then investigated by simulating cylinders in tandem arrangements. The resulting aerodynamic and far-field noise characteristics were shown to be complex and extremely sensitive to the separation distance between the cylinders. Finally, a prediction model was developed and validated by comparing predictions against theory and measurements of the noise radiated by a simple two-wheel landing gear model. The results demonstrated the capability of the model to accurately predict correct spectral and directivity characteristics.
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Vallès, 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.

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A 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
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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.

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Vernet, 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.

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ORAZI, MATTEO. « Bluff Bodies Flow Control using Innovative Piezoelectric Actuators ». Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2562349.

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An active flow control technique based on “smart-tabs” is proposed to delay flow separation on a circular cylinder and on a simplified bi-dimensional automotive geometry body. The actuators are retractable and orientable multilayer piezoelectric tabs which protrude perpendicularly from the model surface. They are mounted along the spanwise direction with constant spacing. The effectiveness of the control was tested in pre-critical and in post-critical regime by evaluating the effects of several control parameters of the tabs like frequency, amplitude, height, angular position and plate incidence with respect to the local flow. Measurements of the mean static pressure distribution around the cylinder were used to estimate the pressure drag and lift coefficient. To take into account friction and the parasite drag of the actuators wake analysis was performed. The maximum drag reduction achieved in the pre-critical regime was of the order of 30%, whereas in the post-critical regime was about 15%, both for the highest forcing available. In pre-critical condition the active forcing plays an important role on drag and pressure fluctuations reduction. Spectral analysis of the signals from instantaneous pressure transducers (electret microphones) indicated an almost complete suppression of the vortex shedding in active forcing conditions. In post-critical regime, instead, most of the effects are due to passive forcing limiting the active contribution to a maximum of 3%. The results related to the automotive geometry confirm the ones obtained on the circular cylinder, with a maximum attained drag reduction of 13.4% with only small contributions due to active forcing. To evaluate the potentialities of the smart-tabs in real applications power absorption measurements are reported together with energy budget considerations. Finally, the identification of the key non-dimensional control parameters, was performed.
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SARDU, COSTANTINO. « Active flow control around simplified 3D bluff bodies ». Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2676916.

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In the present work is illustrated a flow control technique designed with the aim of reducing the aerodynamic drag of a three-dimensional car model with a square-back rear part. The technique is based on continuous jets disposed in the periphery of the rear surface of the model. The design process of the entire investigation is illustrated. As a first step, a preliminary CFD study was performed to verify the effectiveness of the technique and its sensitivity to the flow control parameters. This CFD analysis assisted the design and the set up of the physical experiment. Several different measurements were performed and the entire chain of measurement is widely described evidencing the methodology. The assessment of this experimental methodology is also presented, which allowed to properly calibrate the different acquisition parameters and to reach adequate level of accuracy and repeatability of the measurements. Subsequently, the experimental investigation with the several diagnostic measurements allowed to understand and explain the flow characteristics. The wide range of flow control configurations evidenced, in fact, the effect that the forcing have on the pressure distribution, the flow structures and, consequently, on the drag value. The wake different sensitivity on the flow control parameters highlighted the most effective configuration which led to a drag reduction up to 12.6%. The analysis of pressure fluctuations, supported by the smoke visualization and the POD analysis evidenced the main flow structures present in the wake, their typical frequencies and their relation on the drag values. Finally the energy budget of the entire flow control system is presented in order to highlight the most efficient configurations and evidence the multi-criteria aspect of the active flow control technique presented.
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Mushyam, Aditya. « Effects of flow control on flow past bluff bodies ». Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398031.

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The aim of this Ph.D. thesis, "Effects of flow control on flow past bluff bodies" is to study and analyzes the effects of Flow Control on various aspects and proverbs of flow past bluff bodies. Flow control techniques are presently researched and studied across the world to gauge their effectiveness in altering flow properties and patterns in different flow scenarios. The inspiration for the present work is derived from automobile industry, as analyzing the flow over backward step and inclined step shall help in understanding the characteristics of the rear vehicle wake. Since a considerable percentage of the energy needed to propel the vehicle is dissipated by the vorticity generated in the rear of the vehicle, hence it is of utmost importance to understand the properties of the wake. In the present study various possibilities were explored for application and examine effectiveness of active flow control techniques in bluff bodies to increase the aerodynamic efficiency. The primary aim of the study is to reduce the drag acting on bluff bodies by determining an effective active flow control technique and configuration. Two different kinds of Active Flow Control techniques have been used in this thesis namely, "Zero Net Mass Flow Actuator" and "Fluidic Actuator". The characteristics of laminar and turbulent boundary layer were analyzed and the effectiveness of flow control in delaying the detachment of the boundary layer was analyzed. Numerical simulation programs were developed in C language for simulating various cases in the thesis and a 3D LES turbulence modeling finite volume code was developed using Smagorinsky-Lilly model in C language for the simulating the flow over backward step in turbulence regime. All the numerical simulation codas were validated with previous research works. The thesis is divided into five chapters analyzing flow over square cylinder, backward step and inclined step geometries in 2D and 3D in laminar and turbulent regimes
L'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
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Livres sur le sujet "Bluff bodie"

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Kodali, V. S. Prediction of turbulent flows behind bluff bodies by using an algebraic-stress model. New York : AIAA, 1986.

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Pilloni, M. T. A comparison between two LDV systems used to measure the flow field behind a bluff body. Rhode Saint Genese, Belgium : von Karman Institute for Fluid Dynamics, 1995.

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A. K. M. Sadrul Islam. Prediction of vortex shedding behind bluff bodies. Loughborough : Loughborough University, Department of Aeronautical & Automotive Engineering & Transport Studies, 1997.

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N, Tiwari S., Old Dominion University. Research Foundation. et Langley Research Center, dir. Numerical solutions of three-dimensional Navier-Stokes equations for closed bluff-bodies : Progress report for the period ending December 31, 1984. Norfolk, Va : Old Dominion University Research Foundation, 1985.

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Grid adaptations for bluff bodies. Norfolk, Va : Old Dominion University Research Foundation, 1986.

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Numerical solutions of three-dimensional Navier-Stokes equations for closed-bluff bodies. Norfolk, Va : Old Dominion University Research Foundation, 1986.

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MacBean, D. A. A study of vortex shedding around bluff bodies in stratified fluid flow. 1995.

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Chapitres de livres sur le sujet "Bluff bodie"

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Provansal, Michel. « Wake Instabilities Behind Bluff Bodies ». Dans Dynamics of Spatio-Temporal Cellular Structures, 179–202. New York, NY : Springer New York, 2006. http://dx.doi.org/10.1007/978-0-387-25111-0_10.

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Panigrahi, Pradipta Kumar, et Krishnamurthy Muralidhar. « Flow Past Heated Bluff Bodies ». Dans Imaging Heat and Mass Transfer Processes, 7–43. New York, NY : Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4791-7_2.

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Duell, E. G., et A. R. George. « Unsteady Wakes of Three Dimensional Bodies ». Dans Bluff-Body Wakes, Dynamics and Instabilities, 293–96. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-00414-2_64.

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Bardakhanov, S. P., et V. V. Kozlov. « Onset and Development of Disturbances in Wakes Behind Bodies ». Dans Bluff-Body Wakes, Dynamics and Instabilities, 153–56. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-00414-2_35.

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Kiya, M., O. Mochizuki, Y. Ido, T. Suzuki et T. Arai. « Flip-Flopping Flow Around Two Bluff Bodies in Tandem Arrangement ». Dans Bluff-Body Wakes, Dynamics and Instabilities, 15–18. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-00414-2_3.

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Yavorsky, N. I. « Laminar and Turbulent Wakes of Bodies of Arbitrary Shape in Uniform Flow ». Dans Bluff-Body Wakes, Dynamics and Instabilities, 301–8. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-00414-2_66.

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Gersten, K., A. Becker et T. Demmer. « Experimental Investigation of the Wake Past Bluff Bodies ». Dans Notes on Numerical Fluid Mechanics (NNFM), 233–40. Wiesbaden : Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-663-13986-7_31.

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Moryń-Kucharczyk, Elżbieta, et Renata Gnatowska. « Pollutant Dispersion in Flow Around Bluff-Bodies Arrangement ». Dans Wind Energy, 49–53. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-33866-6_9.

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Papenfuss, Heinz-D., et Klaus Gersten. « Separated Flows Behind Bluff Bodies Including Ground Effects : Application of The Zonal Method ». Dans Bluff-Body Wakes, Dynamics and Instabilities, 297–300. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-00414-2_65.

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Chernyshenko, S. I. « Asymptotic Theory of the Stationary Flow Around Bluff Bodies ». Dans Separated Flows and Jets, 121–24. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84447-8_14.

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Actes de conférences sur le sujet "Bluff bodie"

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HANNA, M., M. BARDON et V. RAO. « Flame stabilization behind bluff bodies ». Dans 25th Joint Propulsion Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-2801.

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Davies, P. O. A. L. « CONVECTIVE HEAT TRANSFER FROM BLUFF BODIES ». Dans International Heat Transfer Conference 3. Connecticut : Begellhouse, 2019. http://dx.doi.org/10.1615/ihtc3.1850.

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Taubert, Lutz, Per Kjellgren et Israel Wygnanski. « Generic Bluff Bodies with Undetermined Separation Location ». Dans 1st Flow Control Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3068.

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McLaughlin, Thomas, James Reynolds, Timothy Siefers, Kevin Rowe, Sergio Duran et Trevor Lockhart. « Low Velocity Drag Measurements for Bluff Bodies ». Dans 21st AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-2548.

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Song, Yidan, Rui Zhu, Terrence Simon et Gongnan Xie. « A Numerical Study of Flow Patterns, Drag and Lift for Low Reynolds Number Flow Past Tandem Cylinders of Various Shapes ». Dans ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70089.

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The flow over two different shaped bluff bodies in tandem arrangement was numerically investigated by using the finite volume method with Computational Fluid Dynamics (CFD) techniques. The shape of the downstream main bluff body is a right circular cylinder, with shape unchanged, while the shape of the upstream bluff body varies between: circle, triangle, square, ellipse and cylindrical half-shell. The hydraulic diameters of both front and rear bluff bodies are equal. The analysis is carried out for Reynolds numbers of 100, 300 and 500, and center-to-center distance ratios, L/D, of 1.5, 2, 3, 4.5 and 6. Flow characteristics in terms of the lift and drag coefficients and Strouhal number are analyzed and the vortex shedding patterns around the bluff bodies are described. The influence of the shape of the fore cylinder on the flow characteristics is the innovation point of this paper. It is concluded that the center-to-center distance ratio, L/D, and the shape of the upstream bluff body have important effects on the drag and lift coefficients, vortex shedding frequencies from the two bluff bodies, and flowfield characteristics.
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Izadi, Mohammad J. « Numerical Effect of Airflow From a Lower Canopy (Bluff Body) Into an Upper Canopy in Steady and Turbulent Condition ». Dans ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55074.

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In this paper, a 3-D flow field around two bluff bodies in an incompressible fluid is modeled [1]. Formations of these two bodies are top to top (One on the top of the other) with respect to the center of each other. The lower on has a constant cross sectional area with a vent of air at its apex and the upper one has a variable cross sectional area with no vent on it. The vertical distances between the bluff bodies, the cross sectional area, and also the vent ratio of bluff bodies are varied here. Vertical distances of these two bodies are varied form zero to half, equal, double and triple the radius of the body with a vent on it (lower body). Flow condition is considered 3D, steady, turbulent, and incompressible. The drag force on each body and also the pressure around the two bodies are calculated. From the numerical results, it can be seen that, the drag force is constant over the range of zero to twenty percent of the vent ratios and for higher vent ratios when the upper bluff body is smaller than the lower one the drag force decreased, and it increased when the upper bluff body is larger than the lower one.
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Ruscher, Christopher, John Dannenhoffer, Mark Glauser, Barry Kiel et Balu Sekar. « Vortex Shedding of Various Bluff Bodies in Cross Flow ». Dans 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-4285.

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Bethancourt, Angel, Kunio Kuwahara et Satoko Komurasaki. « Grid Generation and Unsteady Flow Simulation Around Bluff Bodies ». Dans 41st Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-1129.

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Modi, V. J., B. Ying et T. Yokomizo. « Boundary-Layer Control of Bluff Bodies Through Momentum Injection ». Dans International Truck & Bus Meeting & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 1990. http://dx.doi.org/10.4271/902225.

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PARK, WOE-CHUL, et HIROSHI HIGUCHI. « Computation of flow past single two-dimensional bluff bodies ». Dans 21st Fluid Dynamics, Plasma Dynamics and Lasers Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-1499.

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Rapports d'organisations sur le sujet "Bluff bodie"

1

Liu, J. T. Studies of Nonlinear Instabilities of Developing Wake Flows Behind Bluff Bodies and Their Control. Fort Belvoir, VA : Defense Technical Information Center, avril 1992. http://dx.doi.org/10.21236/ada251275.

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Liu, J. T. Studies of Nonlinear Instabilities of Developing Wake Flows Behind Bluff Bodies and Their Control. Fort Belvoir, VA : Defense Technical Information Center, juin 1990. http://dx.doi.org/10.21236/ada227952.

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Domaradzki, Julian A. The Near Wake of Bluff Bodies in Stratified Fluids and the Emergence of Late Wake Characteristics. Fort Belvoir, VA : Defense Technical Information Center, octobre 2010. http://dx.doi.org/10.21236/ada531692.

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