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Добірка наукової літератури з теми "Rectangular cylinders"

Автор: Grafiati

Опубліковано: 10 березня 2023

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Статті в журналах з теми "Rectangular cylinders"

Ozono, Shigehira, Takao Kitajima, and Takejiro Ichiki. "THE FLOW AROUND RECTANGULAR CYLINDERS PLACED IN SIMPLE SHEAR(Flow around Cylinder 1)." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 427–32. http://dx.doi.org/10.1299/jsmeicjwsf.2005.427.

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Cho, H. H., M. Y. Jabbari, and R. J. Goldstein. "Mass Transfer With Flow Through an Array of Rectangular Cylinders." Journal of Heat Transfer 116, no. 4 (November 1, 1994): 904–11. http://dx.doi.org/10.1115/1.2911465.

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The mass transfer from an array of naphthalene-coated parallel rectangular cylinders, through which air passes in a slitlike flow, has been measured. The local Sherwood numbers indicate that the flow pattern is asymmetric in spite of using an array of two-dimensional, equally spaced identical cylinders. Smoke-wire flow visualization verifies this asymmetry, showing alternate short and long wakes around the cylinders, due probably to the instability of vortex shedding. On the side surfaces of the cylinders with the short wakes, the airflow deflects and reattaches, resulting in a high mass transfer. Also, a strong impinging effect is observed on the leeward (back) surface of these cylinders at high Reynolds numbers. Reattachment is not observed on the side surface for cylinders with the long wakes. On these, however, the mass transfer on the leeward surface is higher than on the short wake cylinders. This may be due to the relatively low naphthalene vapor concentration in the long wakes. The distribution of the short wakes (and the long wakes) is periodic and relatively stable. However, their position can be changed from one cylinder to the adjacent one by a disturbance. Measurements were taken over a moderate Reynolds number range of 300 to 3000 (based on the cylinder-to-cylinder pitch and approaching velocity). The laminar, transition, and turbulent nature in the wake flows can be inferred from the results.

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Roy, A., and G. Bandyopadhyay. "Numerical calculation of separated flow past square and rectangular cylinders using panel technique." Aeronautical Journal 110, no. 1106 (April 2006): 249–56. http://dx.doi.org/10.1017/s0001924000001226.

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AbstractIn the present investigation, a potential flow model based on panel method has been developed for calculation of two dimensional separated flows past square and rectangular cylinders. Free vortex lines are assumed to emanate from the points of separation that converge downstream of the body. The converged wake shape is iteratively obtained by integrating the velocity vectors at the collocation points. For solving separated flow past square and rectangular cylinders, four different versions of the solver have been developed for a wide range of incidence, namely, for zero, low, moderate and high angles of incidence. For validation of computed results, experimental investigations have been carried out in a low speed wind tunnel to obtain the surface pressure distribution on square cylinder and rectangular cylinder over a range of angles of incidence. Comparison is reasonably good.

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CHEN, ZHIHUA, XIAOHANG JIANG, and JUNLI HANG. "LARGE EDDY SIMULATION OF A 3D CHANNEL FLOW WITH WALL-MOUNTED RECTANGULAR CYLINDERS." Modern Physics Letters B 23, no. 03 (January 30, 2009): 301–4. http://dx.doi.org/10.1142/s0217984909018254.

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Large eddy simulation was applied to simulate the compressible flow past multiple wall-mounted rectangular cylinders in a channel flow. The dynamic sub-grid stress model was employed to approximate the sub-grid scale effects. For flow past single wall-mounted cylinder, our calculated results agree well with the results of both previous experimental and numerical results which showed the formation and diffusion of vortexes around the cylinder. Flow past two wall-mounted cylinders has also been simulated numerically and our numerical results disclosed the formation of the vortex street behind the second cylinder and the developing process of flow field, which is important for practical engineering application.

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HIRANO, H., S. WATANABE, A. MARUOKA, and M. IKENOUCHI. "Aerodynamic Characteristics of Rectangular Cylinders." International Journal of Computational Fluid Dynamics 12, no. 2 (January 1999): 151–63. http://dx.doi.org/10.1080/10618569908940820.

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Nishikawa, Reon. "Passive control of the flow-induced noise from a rectangular cylinder using porous walls." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (August 1, 2021): 4219–25. http://dx.doi.org/10.3397/in-2021-2635.

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A noise reducing technique for the flow-induced noise using a porous material was studied experimentally and numerically. In the experiment, flow-induced noises emitted from three types of rectangular cylinders were measured in a low-noise wind tunnel. One cylinder was made of four aluminum plates and others were made of two or three aluminum plates. Measurement results show that the frequency of the distinct tonal noise was different among three cylinders, that frequency was higher for using porous material. It was also found that the sound pressure lelvel of the noise was also different and that of the cylinder using two porous material plates was 25 dB smaller at maximum. Velocity field of the wake of cylinders were examined by the PIV measurement and that showed that time and space scale of separated vortices around cylinder were smaller for using two porous material plates. It is assumed that the change of aerodynamic sound was caused by that change in velocity field. In the numerical simulation, we could simulate changes of the emitted noise and the wake of the cylinder by applying the slip boundary condition of the velocity to the wall of the cylinder.

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Nakamura, Yasuharu, and Katsuya Hirata. "Critical geometry of oscillating bluff bodies." Journal of Fluid Mechanics 208 (November 1989): 375–93. http://dx.doi.org/10.1017/s0022112089002879.

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Measurements are presented of the mean pressures around rectangular and D-section cylinders, with a flat front face normal to the flow, forced to oscillate transversely at an amplitude of 10% of the length of the front face. The ratio of depth (streamwise dimension) to height (cross-stream dimension) of the cross-section ranges from 0.2 to 1.0 for rectangular cylinders and from 0.5 to 1.5 for D-section cylinders. The range of reduced velocities investigated, 3 to 11, includes the vortex-resonance region. When increasing the depth, an oscillating bluff cylinder shows a critical depth where base suction attains a peak. The value of a critical depth is lowered with decreasing reduced velocity. In particular, an extraordinarily low critical depth with a very high base suction is obtained on cylinders oscillating at vortex resonance. For cylinders with depths beyond the critical, a reattachment-type pressure distribution is established on the afterbody due to the shear-layer/edge direct interaction. The shear-layer/edge direct interaction can also occur on oscillating cylinders with a fixed splitter plate. At low reduced velocities, the reattachment-type pressure distributions on cylinders with and without a splitter plate are similar except for the mean level. A remark is made on the critical geometry of bluff bodies under various flow conditions.

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Olayemi, O. A., A. M. Obalalu, S. E. Ibitoye, A. Salaudeen, M. O. Ibiwoye, B. E. Anyaegbuna, and I. K. Adegun. "Effects of Geometric Ratios on Heat Transfer in Heated Cylinders: Modelling and Simulation." Nigerian Journal of Technological Development 19, no. 4 (January 28, 2023): 287–97. http://dx.doi.org/10.4314/njtd.v19i4.1.

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The application of fluid and heat transfer in electronic and nuclear technology is gaining popularity, particularly in equipment's life span and risk management. However, further study is required for applications involving rectangular cylinders placed inside a square cavity. This study investigates the effects of height ratio (𝐻𝑅), and width ratio (𝑊𝑅) for Prandtl number 𝑃𝑟=0.71 on natural convective heat transfer and the flow field around the annulus of a square domain fitted internally with a heated rectangular cylinder. The square enclosure and the inner rectangular cylinder walls were respectively maintained at cold and hot isothermal conditions. COMSOL Multiphysics (Version 5.6) software was adopted to implement the governing equations and boundary conditions. The results are presented in the form of streamlines, isothermal contours, and Nusselt number (Nu). The study reveals that the combined average Nu of the rectangular cylinder walls improves with 𝐻𝑅, 𝑊𝑅, and Rayleigh number (Ra). The maximum Nu occurred at 𝐻𝑅=0.7, and 𝑊𝑅=0.7; however, height variation at peak average Nu was 37.7% greater than width variation at peak average Nu. This study finds applications in the cooling of electronic chips and aerospace engines.

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Murata, M., M. B. Utzinger, D. H. Chen, and H. Nisitani. "Stress Analysis on Rectangular Cross-Sectional Ring Headers." Journal of Pressure Vessel Technology 117, no. 4 (November 1, 1995): 293–97. http://dx.doi.org/10.1115/1.2842126.

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For rectangular cross-sectional ring headers, the authors’ theoretical stress analysis is presented to agree with actual stresses by measurement with strain gages. Therefore, this analytical method is applicable for similar rectangular cross-sectional ring headers. When the aspect ratio (length of two cylinders/radius difference between two cylinders) is more than three, moments originating at the end of finite long cylinders and tangential stresses on the half-length of both cylinders are almost the same as values from infinitely long cylinders. Regarding the welds between flat cover plates and cylinders, cover plate designs can be remarkably thinner by changing the weld shape, that is, by using T-joint weld with a single-bevel groove, than compared to Type (i) in PG-31 of ASME Code.

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UMEDA, Shinzaburo, and Wen-Jei YANG. "Flow visualization between two rectangular cylinders." Journal of the Visualization Society of Japan 18, Supplement1 (1998): 161–64. http://dx.doi.org/10.3154/jvs.18.supplement1_161.

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Дисертації з теми "Rectangular cylinders"

Steggel, Nathan. "A numerical investigation of the flow around rectangular cylinders." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/771936/.

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The viscous flow around rectangles defined by afterbody length, B, and cross-stream dimension, A, is investigated through a hybrid discrete vortex method. For uniform flow conditions the effects of varying the side ratio, BIA, the angle of incidence, a, and the Reynolds number, Re, are all considered. Pulsating flow results are reported for rectangular cylinders with B/A values of 0.62, 1.0, 2.0 and 3.0, a B/A=1.0 cylinder inclined at 45° and a circular cylinder. At a fixed Reynolds number, Re=200, the variation of drag coefficient with side ratio shows CD increasing with decreasing B/A. This contrasts with the known result at higher Reynolds number, 104500 the calculated Strouhal number is dual valued. The 'lock-in' characteristics under pulsating flow are shown to be highly dependent on body geometry. All the cylinders are shown to exhibit an asymmetric resonant mode within which the shedding frequency is controlled at half the forcing frequency and the mean forces increase. Several different shedding patterns are predicted across this asymmetric synchronisation range. A 'quasi-symmetric' mode is also observed for some cylinders characterised by near wake symmetry and a substantial reduction in mean forces. A pseudo-phase lag is defined which relates a moment of the lift cycle to a moment of the forcing oscillation. This is shown to change across the synchronisation range of each cylinder considered and the change is found to be greater at lower forcing amplitude.

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Venugopal, Vengatesan. "Hydrodynamic force coefficients for rectangular cylinders in waves and currents." Thesis, University of Glasgow, 2002. http://theses.gla.ac.uk/6351/.

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The research into hydrodynamic loading on ocean structures is concentrated mostly on circular cross section members and relatively limited work has been carried out on wave loading on rectangular sections, particularly in waves and currents. This research work is therefore carried out focussing on the evaluation of hydrodynamic force coefficients for sharp edged rectangular cylinders of various cross-sections (aspect ratios), subjected to waves and currents. Three cylinders with three different cross-sections are constructed and tested vertically, as surface piercing and horizontally, as fully submerged with the cylinder axis parallel to the wave crests. The aspect ratios considered for this investigation are 1.0, 112, 2/1, 3/4 and 4/3. The length of each cylinder is 2000mm. The sectional loadings are measured on a 100mm section, which is located at the mid-length of the cylinder. The forces are measured using a force measuring system, which consists of load cells, capable of measuring wave and current forces. The in-line & transverse forces (for vertical cylinders) and horizontal & vertical forces (for horizontal cylinders) have been measured. For horizontal cylinder, to study the effect of depth of variation on submergence of the cylinder, the tests are carried out for two depths of submergence. The experiments are carried out at the Hydrodynamic Laboratory, Department of Naval Architecture and Ocean Engineering, University of Glasgow. The tests are carried out in a water depth of 2.2m with regular and random waves for low Keulegan-Carpenter (KC) number up to 4.5 and the Reynolds number varied from 6.397xl03 to 1.18xl05 • The combined wave and current effect has been produced by towing the cylinders in regular waves, along and opposite to the wave direction at speeds of ± 0.1 mis, ± 0.2 mls and ± 0.3 mls. Based on Morison's equation, the relationship between inertia and drag coefficients are evaluated and are presented as a function of KC number for various values of frequency parameter, {3. For the vertical cylinders, the drag coefficients decrease and inertia coefficients increase with increase in KC number up to the range of KC tested for all the cylinders. For the horizontally submerged cylinders, the drag coefficients showed a similar trend to vertical cylinders, whereas the inertia coefficients decrease with increase in KC number for all the cylinders. This reduction in inertia force is attributed to the presence of a circulating flow [Chaplin (1984)] around the cylinders. The random wave results are consistent with regular wave results and the measured and computed force spectrum compares quite well. While computing the force coefficients in the case of combined waves and currents, only the wave particle velocity is used, as the inclusion of current velocity tends to produce unreliable drag force coefficients. For vertical cylinders, the drag and the inertia coefficients in combined waves and currents are lower than the drag and the inertia coefficients obtained in waves alone. For horizontal cylinders the drag coefficients are larger than those obtained for waves alone and the inertia coefficients are smaller than those measured in waves alone. The Morison's equation with computed drag and inertia coefficients has been found to predict the measured forces well for smaller KC numbers. However, the comparison between measured and computed positive peak forces indicate that the computed forces are underestimated. It is suggested that if the wave particle kinematics are directly measured, this discrepancy between measured and computed forces might well be reduced. Wave excitation forces are also reported in non-dimensional forms in the diffraction regime, using 3D-Green function method. Wave induced pressure distribution around the cylinder in regular waves have been measured and are reported as normalised pressures. Wave run-up on the cylinder surfaces has been measured and simple empirical formulae are presented for run-up calculations on the cylinder surfaces. The results of this investigation show that the cylinder aspect ratio plays major role on hydrodynamic force coefficients, dynamic pressure distribution and on wave run-up on cylinder surfaces.

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Namiranian, Farshid. "Fluctuating lift on cylinders of rectangular cross section in smooth and turbulent flows." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25126.

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This thesis presents an experimental investigation of the fluctuating lift (or side force) coefficient on fixed two dimensional rectangular cylinders for various free stream turbulence intensities and scales. The measurements are made using turbulence producing devices such as grids and circular rods placed upstream of the stagnation line of the model. Measurements are reported for three fixed rectangular prisms with B/H of .5, .67 and 1 where H is the frontal dimension and B is the streamwise width of the body. The method of measurement made it possible to vary the body span so that the correlation of the fluctuating side force over the body span could be investigated. It was shown that for low turbulence intensity, the spanwise correlation of the fluctuating side force over the square cylinders decreases by a large amount with increasing span. For higher turbulence intensity this decrease was reduced, and for U'/U≃10% there was essentially no decrease of fluctuating lift coefficient with increase of span.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate

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Tran, Thanh Tinh. "Développement d'une méthode hybride RANS-LES temporelle pour la simulation de sillages d'obstacles cylindriques." Phd thesis, ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. http://tel.archives-ouvertes.fr/tel-00823281.

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Dans le domaine de la modélisation des écoulements turbulents, les approche hybrides RANS/LES ont reçu récemment beaucoup d'attention car ils combinent le coût de calcul raisonnable du RANS et la précision de la LES.Parmi elles, le TPITM (Temporal Partially Integrated Transport Model) est une approche hybride RANS/LES temporelle qui surmonte les inconsistances du raccordement continu du RANS et de la LES grâce à un formalisme de filtrage temporel. Cependant, le modèle TPITM est relativement difficile à mettre en œuvre et, en particulier, nécessite l'utilisation d'une correction dynamique, contrairement à d'autres approches, notamment la DES (Detached Eddy Simulation).Cette thèse propose alors une approche hybride RANS/LES similaire à la DES, mais basée sur un filtrage temporel, déduite du modèle TPITM par équivalence, c'est-à-dire en imposant la même partition entre énergies résolue et modélisée. Ce modèle HTLES (Hybrid Temporal LES) combine les caractéristiques de la DES (facilité de mise en œuvre) et du TPITM (formalisme consistant, justification théorique des coefficients).Après calibration en turbulence homogène, l'approche est appliquée à des cas d'écoulements autour de cylindres carrés puis rectangulaires. La modélisation des tensions de sous-filtre est une adaptation au contexte hybride du modèle RANS k-wSST.

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Tamrakar, Swaraj. "Analytical Model Study of Flow Through Trapezoidal, Half-Trapezoidal and Rectangular Channels with Submerged and Un-submerged Rigid Cylinders." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1380.

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For this study, two analytical models were developed for predicting the depth-averaged velocity distribution (U) in trapezoidal, half-trapezoidal and rectangular channels with submerged and unsubmerged rigid cylinders. The first model uses linear superposition of momentum defects (MDS) and mass conservation, and is referred to as the MDS model. The second model uses linear superposition of velocity defects (VDS) and mass conservation, and is referred to as the VDS model. For implementing either the VDS or MDS model, a criterion is required for considering the wake created by an individual cylinder to be fully dissipated (i.e., a cutoff criterion). Also, implementing the MDS model requires numerical integration. Analyses were conducted to identify suitable cutoff criterion and an appropriate subinterval size for the numerical integration. Data from a physical model study conducted in a flume with a half-trapezoidal channel section was used to calibrate and validate the models. Data from a physical model study conducted in a rectangular channel section was also used to validate the model. Predicted values of U from the VDS and MDS models were within the range of ± 20 % of the trapezoidal channel section validation data. The models failed to accurately predict U for the rectangular channel section data. It is concluded that the models developed herein should be used only for half-trapezoidal channel sections. With respect to the trapezoidal channel section validation data, the MDS model yields a sum of squared errors that is 36% less than that yielded by the VDS model. Therefore, the MDS model is regarded as the best model overall for computing U in half-trapezoidal channel sections.

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Massai, Tommaso [Verfasser], and Prof Klaus [Akademischer Betreuer] Thiele. "On the Interaction between vortex-induced vibration and galloping in rectangular cylinders of low side ratio / Tommaso Massai ; Betreuer: Prof. Klaus Thiele." Braunschweig : Technische Universität Braunschweig, 2015. http://d-nb.info/1175818984/34.

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Shrestha, Sanjeet. "WAKE CHARACTERISTICS DOWNSTREAM OF A RIGID UNSUBMERGED CYLINDER IN A RECTANGULAR CHANNEL." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1379.

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Wakes form when a fluid flows past stationary objects. Within the wake, the velocity of the fluid is reduced, that is, there is a velocity defect. Limited information is available for predicting the magnitude of the velocity defects and the width of wakes that form behind rigid cylinders in open-channel flows. Therefore, the objective of this study is to develop relationships for predicting wake geometry downstream of a rigid unsubmerged cylinder. This study was conducted in a 0.46-m-wide rectangular channel with either medium sand (median size, d50 = 0.33 mm) or fine gravel (d50 = 6.35 mm) bed material. A wooden dowel (6.35 mm to 38.1 mm in diameter) was used as a rigid cylinder. Point velocity data was collected for varied hydraulic conditions; the data was used to compute the maximum velocity defect (umax) and half-width of the wake (2b1/2) at sections located different distances downstream from the cylinder (&Deltax). The data were also used to compute parameters for models that predict umax and 2b1/2 as a function of x. It was expected that the study results would yield two equations: one for predicting umax and 2b1/2; instead, the parameters varied with cylinder size and bed material. Since the results were not as expected, evaluation tests were performed to determine why the parameters varied. The evaluation tests (pump configuration tests, point-velocity repetition-tests, point-velocity sampling-time tests, and boundary-layer-development tests) revealed that the turbulent boundary layer (the layer of fluid where the effects of viscosity are significant) was not fully developed in most of the sections where point velocity data was collected. In addition, it was determined that the point-velocity sampling-time of 100 s was not sufficient for keeping the velocity measurement within 2% of the long-term mean velocity (the mean velocity based on a 500-s sample); to achieve this goal it is recommended that a 200-s sampling time should be used.

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Luong, Sanh B. "Numerical investigations of turbulent flow past a rectangular cylinder with active flow control." Thesis, California State University, Long Beach, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10004172.

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The objective of the present research was to investigate the effects of rotating circular cylinders to control high intensity wind load. This research used computational fluid dynamics (CFD) to simulate high Reynolds number gust-like wind load condition for a transient duration of 12 seconds across a three-dimensional rectangular cylinder with dimension of 240x15x7 meters and aspect ratio (Breadth/Height) of 2.3. An array of 20 circular cylinders was positioned along the leading edges of the rectangular bridge cylinder. The research analyzed turbulent flow characteristics across the top and bottom deck surfaces and the development of wake region during two cases: 1) stationary cylinders and 2) rotated cylinders at 400 RPM or velocity ratio of λ = 1.33. The Strouhal number flow characteristics of 0.08 and 0.17 for aspect ratio of 2 to 3 analyzed in this study were found to be in agreements with published literature.

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Nguyen, Dinh Tung. "Vortex-induced vibration of a 5:1 rectangular cylinder : new computational and mathematical modelling approaches." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/43008/.

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As a the limit-cycle oscillation, vortex-induced vibration (VIV) does not cause catastrophic failure but it can lead to fatigue in long and slender structures and structural elements, especially for long span bridges. Assessing this behaviour during the design stage is therefore very important to ensure the safety and serviceability of a structure. Currently, this task requires very time-consuming wind tunnel or computational simulation since a reliable mathematical model is not available. Moreover, knowledge of the underlying physical mechanism of the VIV and, particularly, of the turbulence-induced effect on the VIV is insufficient. Turbulence is normally considered to produce suppressing effects on the VIV; however, this influence appears to depend on cross sections and a comprehensive explanation is yet to be found. This issue can be resulted from some limitation that most wind tunnel or computational studies have used sectional models. The flow field is therefore dominated by 2D flow features. In this research study, the 5:1 rectangular cylinder is selected as the case study since it is considered as the generic bride deck geometry. Using the wind tunnel at the University of Nottingham, a series of wind tunnel tests using a static and elastically supported sectional model is conducted in smooth flow. This wind tunnel study is complemented by a computational study of a static and dynamic sectional model; the computational simulations are carried out using the Computational Fluid Dynamics software OpenFOAM and the High Performance Computer system at the University of Nottingham. A Fluid-structure-interaction (FSI) solver is built to model the heaving VIV. By comparing the surface pressure measurement between these two studies, it uncovers the two separate flow mechanisms and associated flow features, which are both responsible for the VIV. The series of wind tunnel static and dynamic tests is also repeated in different turbulent flow regimes. By analysing the forces, moment, surface pressure and structural response, it reveals the mechanism of the turbulence-induced effect on the aerodynamic characteristics as well as on VIV. By improving the proposed FSI solver, a novel computational approach is introduced to simulate the VIV of a flexible 5:1 rectangular cylinder excited at the first bending mode shape. Employing the Proper Orthogonal Decomposition (POD) technique and comparing against results of the sectional model, some emerging span-wise flow features are revealed together with their influences on the mechanism of the bending VIV. The Hartlen and Currie mathematical model for the VIV is generalised so that it is able to simulate the VIV response of a 3D flexible structure. Such modifications and improvements are originated from and assessed by results of the computational simulation of the flexible model. A case study of the Great Belt East bridge is then carried out to verify this modified model.

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Hellou, Mustapha. "Etude numérique et expérimentale de l'écoulement à structure cellulaire engendré par la rotation d'un cylindre dans un canal." Poitiers, 1988. http://www.theses.fr/1988POIT2267.

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Etude du decollement de l'ecoulement et de la formation de cellules. Structure et caracteristiques geometriques de ces cellules. Analyse du champ hydrodynamique. Calcul numerique base sur l'ecriture des conditions des conditions aux limites par la methode des moindres carres. Mise au point d'une technique de visualisation par intermittence pendant de longues durees, utilisant les traceurs solides

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Книги з теми "Rectangular cylinders"

Frederick, Carder, and Langley Research Center, eds. Buckling tests of a 10-foot diameter stiffened cylinder with rectangular cutouts. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1987.

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C, Hsieh K., and Langley Research Center, eds. Stability of capillary surfaces in rectangular containers: The right square cylinder. [Washington, DC]: National Aeronautics and Space Administration, Langley Research Center, 1998.

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Borri, Claudio, and Claudio Mannini, eds. Aeroelastic Phenomena and Pedestrian-Structure Dynamic Interaction on Non-Conventional Bridges and Footbridges. Florence: Firenze University Press, 2010. http://dx.doi.org/10.36253/978-88-6453-202-8.

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Fluid-structure and pedestrian-structure interaction phenomena are extremely important for non-conventional bridges. The results presented in this volume concern: simplified formulas for flutter assessment; innovative structural solutions to increase the aeroelastic stability of long-span bridges; numerical simulations of the flow around a benchmark rectangular cylinder; examples of designs of large structures assisted by wind-tunnel tests; analytical, computational and experimental investigation of the synchronisation mechanisms between pedestrians and footbridge structures. The present book is addressed to a wide audience including professionals, doctoral students and researchers, aiming to increase their know-how in the field of wind engineering, bluff-body aerodynamics and bridge dynamics.

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Buckling tests of a 10-foot diameter stiffened cylinder with rectangular cutouts. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1987.

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Stability of capillary surfaces in rectangular containers: The right square cylinder. [Washington, DC]: National Aeronautics and Space Administration, Langley Research Center, 1998.

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Частини книг з теми "Rectangular cylinders"

Okajima, Atsushi, Hisanori Ueno, and Toru Nakamura. "Visualization of Flow Around Rectangular Cylinders with Phase-Averaging Technique." In Flow Visualization VI, 373–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_65.

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Rigo, F., V. Denoël, and T. Andrianne. "Vortex Induced Vibrations of Rectangular Cylinders Arranged on a Grid." In Lecture Notes in Civil Engineering, 630–51. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12815-9_48.

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Oosthuizen, Patrick H., and Abdulrahim Y. Kalendar. "Natural Convective Heat Transfer from Short Rectangular Cylinders Having Exposed Upper Surfaces and Mounted on Flat Adiabatic Bases." In Natural Convective Heat Transfer from Short Inclined Cylinders, 93–128. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-02459-2_4.

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Nakamura, Y., and K. Hirata. "A Unified Approach to Galloping of Rectangular Cylinders with or Without a Stationary Splitter Plate." In Bluff-Body Wakes, Dynamics and Instabilities, 197–200. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-00414-2_45.

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Vignesh Ram, P. S., Heuy Dong Kim, and Minoru Yaga. "Study of Rarefied Flow Around Rectangular Cylinder Using DSMC." In 31st International Symposium on Shock Waves 1, 937–43. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-91020-8_112.

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Leonforte, Adriano, Andrea Cimarelli, and Diego Angeli. "Structure of Turbulence in a Flow Around a Rectangular Cylinder." In Springer Proceedings in Physics, 233–38. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57934-4_33.

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Ou, Zhiliang, and Liang Cheng. "Numerical Simulation of Three-Dimensional Flow around a Rectangular Cylinder." In Computational Fluid Dynamics 2002, 775–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59334-5_121.

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Cimarelli, A., A. Leonforte, and D. Angeli. "A Priori Analysis and Benchmarking of the Flow Around a Rectangular Cylinder." In Direct and Large-Eddy Simulation XI, 419–25. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-04915-7_55.

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Koyama, H. S., T. Saito, and M. Ohuchi. "Vortex Street and Turbulent Wakes behind a Circular Cylinder Placed in a Rotating Rectangular Channel." In Turbulent Shear Flows 6, 283–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-73948-4_24.

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Mariotti, A., B. Rocchio, E. Pasqualetto, C. Mannini, and M. V. Salvetti. "Flow Around a 5:1 Rectangular Cylinder: Effects of the Rounding of the Upstream Corners." In ERCOFTAC Series, 85–90. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42822-8_11.

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Тези доповідей конференцій з теми "Rectangular cylinders"

Pidugu, Srikanth B. "Flow Around Rectangular Cylinders With Trailing Jets." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61910.

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The problem of flow past bluff bodies was studied extensively in the past. The problem of drag reduction is very important in many high speed flow applications. Considerable work has been done in this subject area in case of circular cylinders. The present study attempts to investigate the feasibility of drag reduction on a rectangular cylinder by flow injection from the rear stagnation region. The physical problem is modeled as two-dimensional body and numerical analysis is carried out with and without trailing jets. A commercial code is used for this purpose. Unsteady computation is performed in case of rectangular cylinders with no trailing jets where as steady state computation is performed when jet is introduced. It is found that drag can be reduced by introducing jets with small intensity in rear stagnation region of the rectangular cylinders.

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Agelinchaab, M., J. M. Tsikata, M. F. Tachie, and C. Katopodis. "Open Channel Flow Over Pairs of Rectangular and Streamlined Cylinders at Incidence." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78281.

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This paper reports an experimental investigation of the mean flow and turbulence characteristics around pairs of identical rectangular and streamlined cylinders in an open channel. The cylinder pairs were inclined at different angles of incidence angles relative to the streamwise direction of the approach flow. The rectangular cylinders and the 12% symmetric airfoils cylinders are made of transparent acrylic plates of length, L = 100 mm and maximum thickness, D = 12 mm. The centre-to-centre spacing between the cylinders was 51 mm. The blockage ratio produced by the cylinder pairs was 0.13 at zero angle of incidence. For each cylinder pair inclination, a high resolution particle image velocimetry technique was used to conduct detailed velocity measurements in the streamwise-spanwise plane. From these measurements, iso-contours and profiles of the mean velocities and turbulence statistics were obtained to study the effects of cylinder geometry and inclination on the flow around the cylinder pairs.

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Liu, Manqi, Sedem Kumahor, Lucas Audette, and Mark F. Tachie. "Investigations of Aspect Ratio Effects on Wake Dynamics of Rectangular Cylinders." In ASME 2022 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/fedsm2022-87654.

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Abstract In this paper, the flow characteristics around rectangular cylinders with different length to height ratios (aspect ratios, AR) of AR1, AR2, AR3 and AR4 are studied using a particle image velocimetry. The Reynolds number (Re) was 7200 in all cases and the results were analyzed in terms of the mean flow characteristics, Reynolds stresses and triple velocity correlations. The separated flow did not reattach for AR1 and AR2 cylinders. The flow topology around the AR2 cylinder showed a massive wake vortex compared to the other tested cases. The recovery of the mean velocity within the wake region was slowest for AR2, meanwhile, AR3 and AR4 revealed mean reattachment over the cylinder. The magnitudes of the Reynolds stresses and triple velocity correlations were consistently higher along the cylinder centerline for AR1 compared to the other cases.

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Octavianty, Ressa, and Masahito Asai. "Sound Radiation From Two Side-by-Side Rectangular Cylinders With Slightly Different Aspect Ratios." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-12058.

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Sound radiation from two side-by-side rectangular cylinders, one of which had a square cross-section and the other had a rectangular cross-section with aspect ratio AR = 1.2 to 1.5, was examined experimentally at Reynolds numbers Re = 1.0 × 104 - 3.3 × 104 in low Mach number flows. The center-to-center distance between two cylinders T/D was 3.6, 4.5 and 6.0. When the center-to-center distance was small, T/d = 3.6, vortex streets from two different cylinders were synchronized with the same frequency as that for a pair of identical square cylinders, even for the cylinder pair of ARs = 1.0 and 1.5. Sound radiation was dipole-like (planar-anti-symmetric), unlike in the case of square-cylinders-pair where sound radiation was in-phase. For larger cylinder spacing T/d = 6, highly modulated sound was radiated with two different frequencies due to non-synchronized vortex shedding from two cylinders.

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Agelinchaab, Martin, Jonathan Tsikata, and Mark Tachie. "Open Channel Flow over Rectangular Cylinders at Incidence." In 38th Fluid Dynamics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4306.

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Ohnuki, S., N. Ohtaka, and T. Hinata. "Electromagnetic Scattering from Rectangular Cylinders with Wedge Cavities." In 2006 IEEE Antennas and Propagation Society International Symposium. IEEE, 2006. http://dx.doi.org/10.1109/aps.2006.1711219.

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Liu, Lifang, Daogang Lu, and Quanxing Li. "Numerical Simulation of Vortex Shedding From Elongated Rectangular Cylinders in a Rectangular Channel." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29679.

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A two-dimensional code was developed to simulate vortex shedding characteristic and flow-structure interaction (FSI) of plate-type structures. In the code the physical component boundary fitted coordinate (PCBFC) was used to deal with the curve boundary. The arbitrary Lagrangian Eulerian (ALE) method was used to realize the grid movement. A barrier unit idea was adopted to deal with the boundary of fluid domain and solid domain in the code. The code was validated by comparing the numerical simulation results with experimental data. It was found that the vortex shedding phenomena in case of rectangular cylinder are strongly related to the length of the rectangular cylinder in the stream line.

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Yoshinaga, Takashi, Atsushi Tate, and Mitsunori Watanabe. "Flat spin of rectangular cylinders in low speed flow." In 24th Atmospheric Flight Mechanics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-4181.

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Oosthuizen, Patrick H. "A Numerical Study of Natural Convective Heat Transfer From Isothermal High Aspect Ratio Rectangular Cylinders." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17166.

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Natural convective heat transfer from isothermal rectangular cylinders which have an exposed upper surface has been numerically studied. The cylinders considered have high aspect ratios, i.e., have high width-to-depth ratios, and are relatively short, i.e., have a “height” that is of the same order of magnitude as their width. The cylinders considered are mounted on a plane adiabatic base, the cylinders being normal to the plane base with the cylinders pointing either vertically upwards or vertically downwards. One of the main aims of the present work was to numerically determine how the depth-to-width ratio of the rectangular cylinder influences the mean heat transfer rate from the cylinder when this depth-to-width ratio is large. The flow has also been assumed to be steady and laminar and it has been assumed that the fluid properties are constant except for the density change with temperature which gives rise to the buoyancy forces, this having been treated by using the Boussinesq approach. The solution has been obtained by numerically solving the governing equations using the commercial CFD solver, ANSYS FLUENT©. The solution is dependent on the Rayleigh number, the ratio of the width to the height of the heated cylinder, the ratio of the width to the depth of the heated cylinder, the Prandtl number, Pr, and on whether the cylinder is pointing vertically upwards or vertically downwards. Because of the applications that motivated this study, results have only been obtained for a Prandtl number of 0.74, i.e., effectively the value for air. A range of the other governing parameters has been considered and the effects of these governing parameters on the Nusselt number variation have been examined.

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Huang, Zhu, Guang Xi, and Wei Zhang. "Numerical Simulation of Spacing Effects on the Flow Past Two 2:1 Rectangular Cylinders in Tandem at Re = 200." 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/fedsm2012-72157.

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The time-periodic flow over two rectangular cylinders in infinite medium is numerically investigated in this paper using the newly developed multidomain pseudospectral method. The two cylinders are arranged in tandem and both with length-to-width aspect ratio of 2; the incoming flow is assumed to be laminar and uniform, and the Reynolds number based on the cylinder width and the freestream velocity is fixed at 200.Computations are focusing on the effects of S, the ratio between the streamwise spacing of two cylinders (gap length) and the cylinder width, on the vortex shedding formations, evolving patterns and related aerodynamic performances of cylinders within the range 1 ≤ S ≤ 10. Numerical results reveal that as S increases, there exists a critical value, Scr = 5, at which the mean drag coefficients of both cylinders behave notable jumps, and the root-mean-square values of lift and drag coefficients reach maxima. Meanwhile, the vortices behind the two cylinders are shedding in anti-phase mode at Scr, and their evolving patterns are further analyzed and interpreted.

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Звіти організацій з теми "Rectangular cylinders"

Triplett, C. E. Natural convection heat transfer for a staggered array of heated, horizontal cylinders within a rectangular enclosure. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/658136.

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