Relevant bibliographies by topics / Flow; cylinders; induced vibration

Academic literature on the topic 'Flow; cylinders; induced vibration'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Flow; cylinders; induced vibration.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Flow; cylinders; induced vibration"

1

Qin, Bin, Md Mahbub Alam, and Yu Zhou. "Free vibrations of two tandem elastically mounted cylinders in crossflow." Journal of Fluid Mechanics 861 (December 21, 2018): 349–81. http://dx.doi.org/10.1017/jfm.2018.913.

Full text
Abstract:
The paper presents an experimental investigation on the flow-induced vibrations of two tandem circular cylinders for spacing ratio $L/D=1.2{-}6.0$ and reduced velocity $U_{r}=3.8{-}47.8$, where $L$ is the cylinder centre-to-centre spacing and $D$ is the cylinder diameter. Both cylinders are allowed to vibrate only laterally. Extensive measurements are conducted to capture the cylinder vibration and frequency responses, surface pressures, shedding frequencies and flow fields using laser vibrometer, hotwire, pressure scanner and PIV techniques. Four vibration regimes are identified based on the characteristics and generation mechanisms of the cylinder galloping vibrations. Several findings are made on the mechanisms of vibration generation and sustainability. First, the initial states (vibrating or fixed) of a cylinder may have a pronounced impact on the vibration of the other. Second, alternating reattachment, detachment, rolling up and shedding of the upper and lower gap shear layers all contribute to the vibrations. Third, the gap vortices around the base surface of the upstream cylinder produce positive work on the cylinder, sustaining the upstream cylinder vibration. Fourth, reattachment, detachment and switching of the gap shear layers result in largely positive work on the downstream cylinder, playing an important role in sustaining its vibration.
APA, Harvard, Vancouver, ISO, and other styles
2

Shao, Ze, Tongming Zhou, Hongjun Zhu, Zhipeng Zang, and Wenhua Zhao. "Amplitude Enhancement of Flow-Induced Vibration for Energy Harnessing." E3S Web of Conferences 160 (2020): 01005. http://dx.doi.org/10.1051/e3sconf/202016001005.

Full text
Abstract:
In this paper, flow-induced vibrations of bluff bodies with four different cross-sectional geometries (circle, square, triangle and semi-circle) arranged both in single and tandem (gap ratio equals to 3 and 5) configurations are investigated in a wind tunnel. It is found that triangular and square cylinders have the higher amplitude than that of the semi-circular and the circular cylinders in the single configuration. When two cylinders are arranged in tandem, the circular cylinders have the highest amplitude among all tested cylinders. Furthermore, the semi-circular cylinder shows that its vibrating amplitude increases with the reduced velocity in the tandem system due to the galloping effect.
APA, Harvard, Vancouver, ISO, and other styles
3

Jiang, Ren-Jie. "Flow-induced vibrations of two tandem cylinders in a channel." Thermal Science 16, no. 5 (2012): 1377–81. http://dx.doi.org/10.2298/tsci1205377j.

Full text
Abstract:
We numerically studied flow-induced vibrations of two tandem cylinders in transverse direction between two parallel walls. The effect of the horizontal separation between two cylinders, ranging from 1.1 to 10, on the motions of the cylinders and the flow structures were investigated and a variety of periodic and non-periodic vibration regimes were observed. The results show that when two cylinders are placed in close proximity to each other, compared with the case of an isolated cylinder, the gap flow plays an important role. As the separation ratio is increased, the fluid-structure interaction decouples and the cylinders behave as two isolated cylinders.
APA, Harvard, Vancouver, ISO, and other styles
4

Wang, Chaoqun, Xugang Hua, Zhiwen Huang, and Qing Wen. "Aerodynamic Characteristics of Coupled Twin Circular Bridge Hangers with Near Wake Interference." Applied Sciences 11, no. 9 (May 4, 2021): 4189. http://dx.doi.org/10.3390/app11094189.

Full text
Abstract:
Much work has been devoted to the investigation and understanding of the flow-induced vibrations of twin cylinders vibrating individually (e.g., vortex-induced vibration and wake-induced galloping), but little has been devoted to coupled twin cylinders with synchronous galloping. The primary objective of this work is to investigate the aerodynamic forcing characteristics of coupled twin cylinders in cross flow and explore their effects on synchronous galloping. Pressure measurements were performed on a stationary section model of twin cylinders with various cylinder center-to-center distances from 2.5 to 11 diameters. Pressure distributions, reduced frequencies and total aerodynamic forces of the cylinders are analyzed. The results show that the flow around twin cylinders shows two typical patterns with different spacing, and the critical spacing for the two patterns at wind incidence angles of 0° and 9° is in the range of 3.8D~4.3D and 3.5D~3.8D, respectively. For cylinder spacings below the critical value, vortex shedding of the upstream cylinder is suppressed by the downstream cylinder. In particular, at wind incidence angles of 9°, the wake flow of the upstream cylinder flows rapidly near the top edge and impacts on the inlet edge of the downstream cylinder, which causes a negative and positive pressure region, respectively. As a result, the total lift force of twin cylinders comes to a peak while the total drag force jumps to a higher value. Moreover, there is a sharp drop of total lift coefficient for α = 9–12°, indicating the potential galloping instability. Finally, numerical simulations were performed for the visualization of the two flow patterns.
APA, Harvard, Vancouver, ISO, and other styles
5

Chen, S. S. "Flow-Induced Vibrations in Two-Phase Flow." Journal of Pressure Vessel Technology 113, no. 2 (May 1, 1991): 234–41. http://dx.doi.org/10.1115/1.2928751.

Full text
Abstract:
Two-phase flow exists in many shell-and-tube heat exchangers and power generation components. The flowing fluid is a source of energy that can induce small-amplitude subcritical oscillations and large-amplitude dynamic instabilities. In fact, many practical system components have experienced excessive flow-induced vibrations. This paper reviews the current understanding of vibration of circular cylinders in quiescent fluid, cross-flow, and axial flow, with emphasis on excitation mechanisms, mathematical models, and available experimental data. A unified theory is presented for cylinders oscillating under different flow conditions.
APA, Harvard, Vancouver, ISO, and other styles
6

Junwu, Wu, and Yin Zhongjun. "Numerical Investigation on Vortex-Induced Vibration Energy Extraction Efficiency of Double Circular Cylinders In Tandem Arrangement at Low Reynolds Number." MATEC Web of Conferences 153 (2018): 05001. http://dx.doi.org/10.1051/matecconf/201815305001.

Full text
Abstract:
Vortex shedding from a bluff body results in fluctuating forces acting on the bluff body, which may induce vibration of the bluff body when the bluff body is elastically mounted or deformable. Researchers put forward an idea that we can ex-tract energy from the water flow based on VIV at low flow velocity. Although plenty of researches on parameters of VIV are already presented, however, the improvement of energy extraction efficiency still needs further study. According to the previous research, this essay has simulated flow-induced vibration of tandem double circular cylinders when Reynolds number is 100. Working condition has been considered as the fixed upstream cylinder and the free vibration of the downstream cylinder. The influence of the mass coefficient and the two cylinders spacing ratio on the downstream cylinder’s energy obtained from the fluid is studied. Analysis results show that, the maximum value of the energy extraction efficiency is before the frequency locked range. In the case of large spacing ratio (L/D=7~9), the phenomenon of "beat vibration" appears on the downstream cylinder. The results of this work could provide reference for the improvement of energy extraction efficiency and the design of VIV converter.
APA, Harvard, Vancouver, ISO, and other styles
7

Chen, S. S. "A Review of Flow-Induced Vibration of Two Circular Cylinders in Crossflow." Journal of Pressure Vessel Technology 108, no. 4 (November 1, 1986): 382–93. http://dx.doi.org/10.1115/1.3264802.

Full text
Abstract:
The flow field around a pair of rigid circular cylinders is very complex and has been studied extensively. When either one or both cylinders vibrate, the flow field becomes significantly more complicated because of the interaction of the fluid flow and the cylinder motion. This paper presents an overview of the problem including different flow regimes, vortex-excited vibration, and fluidelastic instability for two cylinders in tandem, two cylinders side by side and two cylinders in staggered arrangement. A general formulation to study dynamic response under different conditions is outlined and future research needs are discussed.
APA, Harvard, Vancouver, ISO, and other styles
8

Ghabuzyan, Levon, Christopher Luengas, and Jim Kuo. "Urban Wind Harvesting Using Flow-Induced Vibrations." American Journal of Undergraduate Research 16, no. 4 (March 15, 2020): 71–79. http://dx.doi.org/10.33697/ajur.2020.008.

Full text
Abstract:
The growing global interest in sustainable energy has paved the way to the rapid development of large-scale wind farms, consisting of dozens to hundreds of wind turbines. Although these large wind farms can generate enormous amount of power, they are also costly and require large areas of land or water, and thus are not suitable for urban environments. Smaller urban wind turbines have been developed for urban environments, but there are significant challenges to their widespread deployment. One of these challenges are their urban wind flows as they are strongly affected by complex building structures, producing highly turbulent flows. Any urban wind turbine would need to be designed to function efficiently and safely under these flow conditions; however, these unpredictable and turbulent winds can induce undesirable vibrations and cause early failures. Recently, bladeless wind turbines are gaining interest due to their reduced costs compared with conventional wind turbines such as the vertical-axis wind turbine and horizontal-axis wind turbine. These bladeless turbines convert flow wind energy into vibration energy, then converts the vibration energy into electricity. This paper examines the effects of force-induced vibrations on a cantilever beam system through wind tunnel experimentation. When fluid flows around a bluff body, periodic shedding of vortices may occur under the right conditions. The vortex shedding process creates an asymmetric pressure distribution on the body which causes the body to oscillate, known as vortex-induced vibrations. The purpose of the paper is to understand the factors affecting flow-induced vibrations and to improve wind energy harvesting from these vibrations. The first part of the paper focuses on wind tunnel experiments, by utilizing a cantilever beam configuration, conceptualized by previous research. Then, the experimental model was tested in different configurations, to determine the best setup for maximizing vibrations induced on the model. The long-term goal of the project was utilizing the model to optimize the system to improve efficiency of wind energy harvesting. The experimental results showed that the presence of an upstream cylinder will significantly improve the amplitude of vibration for energy harvesting, furthermore, the experiments showed that spacing in different directions also affect the amplitude of the vibrations. A two tandem cylinder system was used in this work, including a fixed rigid upstream cylinder and a downstream cylinder supported by a cantilever beam. Various configurations of these two cylinders in terms of spanwise and streamwise separation distances were studied and their maximum and root mean square displacements are reported for different wind speeds. Results showed that the presence of an upstream cylinder will significantly improve the amplitude of vibrations. This work verified that a wind energy harvester needs to consider the effects of wind speed and separation configuration of the cylinders in order to maximize the harvester’s performance in urban environments. KEYWORDS: Sustainable Energy; Energy Harvesting; Urban Environments; Bladeless Wind Turbines; Flow-Induced Vibrations; Cantilever Beam System; Wind Tunnel; Wake
APA, Harvard, Vancouver, ISO, and other styles
9

Sakai, Takaaki, Masaki Morishita, Koji Iwata, and Seiji Kitamura. "Experimental Study on the Avoidance and Suppression Criteria for the Vortex-Induced Vibration of a Cantilever Cylinder." Journal of Pressure Vessel Technology 124, no. 2 (May 1, 2002): 187–95. http://dx.doi.org/10.1115/1.1465436.

Full text
Abstract:
Experimental validation of the design guideline to prevent the failure of a thermometer well by vortex-induced vibration is presented, clarifying the effect of structure damping on displacement amplitudes of a cantilever cylinder. The available experimental data in piping are limited to those with small damping in water flow, because of the difficulty in increasing structure damping of the cantilever cylinders in experiments. In the present experiment, high-viscosity oil within cylinders is used to control their structure damping. Resulting values of reduced damping Cn are 0.49, 0.96, 1.23, 1.98, and 2.22. The tip displacements of the cylinder induced by vortex vibration were measured in the range of reduced velocity Vr from 0.7 to 5 (Reynolds number is 7.8×104 at Vr=1). Cylinders with reduced damping 0.49 and 0.96 showed vortex-induced vibration in the flow direction in the Vr>1 region. However, in cases of reduced damping of 1.23, 1.98, and 2.22, the vibration was suppressed to less than 1 percent diameter. It is confirmed that the criteria of “Vr<3.3 and Cn>1.2” for the prevention of vortex-induced vibration is reasonably applicable to a cantilever cylinder in a water flow pipe.
APA, Harvard, Vancouver, ISO, and other styles
10

Ali, Ussama, Md Islam, Isam Janajreh, Yap Fatt, and Md Mahbub Alam. "Flow-Induced Vibrations of Single and Multiple Heated Circular Cylinders: A Review." Energies 14, no. 24 (December 16, 2021): 8496. http://dx.doi.org/10.3390/en14248496.

Full text
Abstract:
This study is an effort to encapsulate the fundamentals and major findings in the area of fluid-solid interaction, particularly the flow-induced vibrations (FIV). Periodic flow separation and vortex shedding stretching downstream induce dynamic fluid forces on the bluff body and results in oscillatory motion of the body. The motion is generally referred to as flow-induced vibrations. FIV is a dynamic phenomenon as the motion, or the vibration of the body is subjected to the continuously changing fluid forces. Sometimes FIV is modeled as forced vibrations to mimic the vibration response due to the fluid forces. FIV is a deep concern of engineers for the design of modern heat exchangers, particularly the shell-and-tube type, as it is the major cause for the tube failures. Effect of important parameters such as Reynolds number, spacing ratio, damping coefficient, mass ratio and reduced velocity on the vibration characteristics (such as Strouhal number, vortex shedding, vibration frequency and amplitude, etc.) is summarized. Flow over a bluff body with wakes developed has been studied widely in the past decades. Several review articles are available in the literature on the area of vortex shedding and FIV. None of them, however, discusses the cases of FIV with heat transfer. In particular systems, FIV is often coupled to heat transfer, e.g., in nuclear power plants, FIV causes wear and tear to heat exchangers, which can eventually lead to catastrophic failure. As the circular shape is the most common shape for tubes and pipes encountered in practice, this review will only focus on the FIV of circular cylinders. In this attempt, FIV of single and multiple cylinders in staggered arrangement, including tandem and side-by-side arrangement is summarized for heated and unheated cylinder(s) in the one- and two-degree of freedom. The review also synthesizes the effect of fouling on heat transfer and flow characteristics. Finally, research prospects for heated circular cylinders are also stated.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Flow; cylinders; induced vibration"

1

Thekkoodan, Dilip Joy. "Interaction of cylinders In proximity under flow-induced vibration." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/92126.

Full text
Abstract:
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 57-59).
This study examines the influence of a stationary cylinder that is placed in proximity to a flexibly mounted cylinder in the side-by-side arrangement. The problem is investigated with an immersed-boundary formulation of a spectral/hp element based (Nektar-SPM) fluid solver. The numerical method and its implementation is validated with benchmark test cases of the flow past an isolated cylinder in both the stationary and flexibly mounted configurations. The study examines a parametric space spanning 6 center-to-center spacing configurations in the range 1.5D-4D and 13 equispaced reduced velocities in the range 3.0-9.0. The simulations are performed in two-dimensional space and the Reynolds number is held at 100. The response characteristics of the moving cylinder are classified into regimes based on the shape of the response curve and the variation of the r.m.s. lift coefficient. It is shown that the moving cylinder influences the lift and drag force characteristics on the stationary cylinder and the frequency composition in the wake. A detailed look at the frequencies and the relative strengths of the frequencies indicates a diminishing influence of the moving cylinder on the stationary cylinder, both with increasing separation and smaller amplitudes. By examining the wake patterns and monitoring the frequencies in the wake of each cylinder, the interference level is qualified and explained to be the basis of the different families of response.
by Dilip Joy Thekkoodan.
S.M.
APA, Harvard, Vancouver, ISO, and other styles
2

Elbanhawy, Amr Yehia Hussein. "On numerical investigations of flow-induced vibration and heat transfer for flow around cylinders." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/on-numerical-investigations-of-flowinduced-vibration-and-heat-transfer-for-flow-around-cylinders(6722ba6d-80de-47f4-a14d-191d4e9ed7fb).html.

Full text
Abstract:
Vortex shedding is an important mechanism, by which the flow around bluff bodies create forces that excite vibratory motion. Vortex-induced vibration (VIV) is studied for a single circular cylinder by means of Computational Fluid Dynamics (CFD) simulations. An arbitrary Lagrangian Eulerian (ALE) formulation is used to achieve the grid deformation needed for VIV. In this thesis, a multifaceted approach is undertaken by which response dynamics and wake interaction are addressed. Four major aspects are considered in the study: the Reynolds number (Re); the mass and damping; the degree-of-freedom for VIV; and the mutual effect between VIV and heat transfer.As attention is paid towards high pre-critical Re flow, the turbulent flow around the cylinder is treated by two turbulence modelling approaches: unsteady Reynolds Averaged Navier Stokes (uRANS), and Large Eddy Simulation (LES). The wake-VIV interaction is analyzed by looking at mean velocities and Reynolds stresses, where decomposition of flow scales is undertaken to explore the evolution of coherent eddy structures, downstream of the cylinder. Conversely, the VIV response is analyzed by considering oscillation amplitude and frequency, in addition to the excitation and inertial dynamics.High turbulence in the separated shear layers disorders the cylinder's VIV response and induces higher amplitudes. The sensitivity for Re is found more pronounced in cylinders with low mass and damping. Meanwhile, VIV is found to enhance wake mixing, and to significantly change the near wake Reynolds stresses. It is suggested that the increase in Re brings a change to the wake patterns, which are known in VIV at lower Re. The kinetic energy production, of near wake eddy structures, is qualitatively altered with the presence of VIV. Furthermore, the surface heat flux is found to cause a noticeable increase in VIV amplitude, as long as it does not disorder the wake correlation. The cylinder's oscillation increases the average value of the Nusselt number (Nu), while the local variance of Nu rises markedly post-separation.
APA, Harvard, Vancouver, ISO, and other styles
3

Rao, Zhibiao. "The flow of power in the vortex-induced vibration of flexible cylinders." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100141.

Full text
Abstract:
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 255-259).
In this thesis techniques are developed which permit the identification of power-in and power-out regions of long cylinders exposed to flow-induced vibration. The data used to illustrate the techniques come from a set of vortex-induced vibration model tests conducted by Shell Oil Co in 2011 at the Marintek facility in Trondheim, Norway. The identification of power-in regions allows one to address the practical problem of determining the primary source of vibration energy when the long cylinder has components of various shapes, such as when buoyancy modules are used in staggered configurations. The identification of power-out regions has a direct practical connection to the estimation of damping magnitude and location on cylinders with varying cross-sections in non-uniform flows. The vibration intensity technique is used in this thesis to locate the power-in and power-out regions of a long flexible cylinder in a steady flow. This method also allows the exploration of the occurrence of secondary power-in regions after suppressing the primary power-in zones. Results may provide useful guidance for the installation and repair of suppression devices such as helical strakes. Three methods are presented to address a practical problem: "When buoyancy modules are applied in a staggered pattern on an otherwise bare cylinder, which distribution patterns result in VIV response dominated by buoyant or bare regions?" Based on the data analysis of five staggered buoyancy pipes, the three methods yielded the same results in identifying the winner. A dimensionless parameter, the "predictor", is proposed. The predictor relies only on the diameters and lengths of bare and buoyant segment. The predictor is verified with an independent set of VIV tests. An equivalent damping parameter is proposed for the purpose of classifying all flexible cylinder VIV response cases onto a single plot of response versus the equivalent damping parameter. After taking Reynolds number into account, results show that the amplitude for pipes with and without helical strakes at different Reynolds numbers can be collapsed onto a single curve as a function of the newly defined equivalent damping parameter.
by Zhibiao Rao.
Ph. D.
APA, Harvard, Vancouver, ISO, and other styles
4

Yang, Wenchao. "Two-dimensional Wakes and Fluid-structure Interaction of Circular Cylinders in Cross-flow." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/97563.

Full text
Abstract:
The wake of a bluff body is a representative issue in vortex dynamics that plays a central role in civil engineering, ocean engineering and thermal engineering. In this work, a flowing soap film was used to investigate the wakes of multiple stationary circular cylinders and of a single oscillating cylinder. Corresponding computer simulations were also conducted. Vortex formation of a stationary circular cylinder was analyzed by proper orthogonal decomposition (POD). The POD analysis was used to define an unsteady vortex formation length, which suggests a relationship between the vortex formation length of a single cylinder and the critical spacing of two cylinders in a tandem arrangement. A systematic parametric study of the wake structure was conducted for a controlled transversely oscillating cylinder. Neural network and support vector machine codes assisted the wake classification procedure and the identification of boundaries between different wake regimes. The phase map of the vortex shedding regimes for the (quasi) two-dimensional experiment qualitatively agrees with previous three-dimensional experiments. The critical spacings of two identical tandem circular cylinders in a flowing soap film system were determined using visual inspections of the wake patterns and calculations of the Strouhal frequencies. The dimensionless spacing was both increased and decreased quasi-statically. Hysteresis was observed in the flow patterns and Strouhal numbers. This study appears to provide the first experimental evidence of critical spacing values that agree with published computational results. The wake interaction between a stationary upstream circular disk and a free downstream circular disk was also investigated. With the ability to tie together the wake structure and the object motion, the relationship between energy generation and flow structure in the simplified reduced order model system was studied. The research results find the optimal efficiency of the energy harvesting system by a parametric study.
PHD
APA, Harvard, Vancouver, ISO, and other styles
5

Chung, Tae-Young. "Vortex-induced vibration of flexible cylinders in sheared flows." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14729.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Humphries, J. A. "Vortex induced vibrations of slender cylinders in sheared flow." Thesis, Cranfield University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383657.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Ortega, Mariana Silva. "Suppression of vortex-induced vibration of a circular cylinder with fixed and rotating control cylinders." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-15072016-152949/.

Full text
Abstract:
The offshore oil industry is engaged in the development of new floating platforms, such as Spar, semi-submersible, tension-leg, FPSO and monocolumn for the exploration of deep and ultra-deep waters. Some of these floating systems have circular cross sections (or cross sections of other bluff geometries) being susceptible to vortex-induced vibrations (VIV). Vortex shedding behind a bluff body can be altered, suppressed or controlled over a limited range of Reynolds numbers. Various flow-control techniques, which result in the reduction of drag and unsteady forces, have been suggested and tested in simple geometries. One such method is the moving-surface boundary layer control (MSBC), in which smaller control rotating cylinders are placed close to the bluff body. This method is considered as an inspiration for the present experimental investigation of VIV suppression for omni-directional flows. In this context, three different configurations have been assembled to compare the effect of suppression on a plain cylinder surrounded by two, four and eight control cylinders distributed symmetrically around it. Experiments were carried out with static models and models free to oscillate in one-degree-of-freedom with fixed and rotating control cylinders. Experiments with a plain cylinder were performed to serve as reference. Displacements, drag and lift forces were measured. The position of the control cylinders proved to be an important parameter to VIV suppression. Configurations with two control cylinders increased lift and drag forces. In contrast, configurations of four and eight control cylinders showed to be more effective to suppress VIV. Furthermore the results for all the cases of the configuration of eight fixed control cylinders presented a reduction of displacement amplitude, lift and drag forces when compared to a plain cylinder. However, when the control cylinders were actuated, the two cases with rotating control cylinders increased drag force when compared to fixed control cylinders.
A indústria offshore está envolvida no desenvolvimento de novas plataformas flutuantes como Spar, semi-submersível, TLP, FPSO e monocoluna para a exploração de águas profundas e ultra-profundas. Alguns destes sistemas flutuantes têm seções transversais circulares (ou de outras seções rombudas) sendo susceptíveis à vibrações induzidas por vórtices (VIV). A esteira de vórtices desprendida de um corpo rombudo pode ser alterada ou suprimida ao longo de uma faixa de número de Reynolds. Várias técnicas de controle do escoamento foram sugeridas e testadas em geometrias simples, resultando na redução de forças de sustentação e arrasto. Um desses métodos é o controle de camada limite por superfícies móveis (CCLSM), no qual cilindrinhos rotativos de controle são colocados próximos ao corpo rombudo. Neste trabalho, este método foi abordado através de uma investigação experimental como um supressor de VIV para o escoamento omnidirecional. Neste escopo três diferentes configurações foram montadas para comparar o efeito de supressão sobre um cilindro liso rodeado por dois, quatro e oito cilindros de controle, distribuídos simetricamente em torno dele. Foram realizados ensaios com o modelo estático, ensaios de VIV em um grau de liberdade com cilindros de controle fixos e rotativos. Foram medidos deslocamento e forças de sustentação e arrasto. Os resultados mostraram que a posição dos cilindros de controle é um parâmetro importante para a supressão de VIV. A configuração com dois cilindros de controle aumentou as forças de sustentação e arrasto. Diferentemente, as configurações de quatro e oito cilindros de controle mostraram-se mais eficazes para suprimir VIV. Além disso, todos os casos da configuração de oito cilindros de controle fixos apresentaram redução nas amplitudes de vibração e nas forças de sustentação e arrasto, quando comparados com um cilindro liso. No entanto, quando os cilindros de controle foram acionados para rotacionar, mostrou-se um aumento na força de arrasto em relação aos cilindros de controle fixos.
APA, Harvard, Vancouver, ISO, and other styles
8

杜平 and Ping To. "Interference effects on the flow-induced vibration of a flexible circular cylinder due to a larger-sized cylinder in the vicinity." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31237769.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

To, Ping. "Interference effects on the flow-induced vibration of a flexible circular cylinder due to a larger-sized cylinder in the vicinity /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19712121.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Resvanis, Themistocles L. "Vortex-induced vibration of flexible cylinders in time-varying flows." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/93782.

Full text
Abstract:
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 221-226).
This thesis investigates two aspects of Vortex-Induced Vibrations (VIV) on long flexible cylinders. The work is split into a minor and major part. The minor part addresses the effect of Reynolds number on flexible cylinder VIV. The major contribution addresses the prediction of VIV under unsteady current excitation or time-varying flows. The study on the effect of Reynolds number makes extensive use of a recent set of experiments performed by MARINTEK on behalf of SHELL Exploration and Production Co. Three 38[gamma] long cylinders of different diameters were towed through the ocean basin over a wide range of Reynolds numbers in both uniform and sheared flows. The experimental data showed that the response amplitudes and dimensionless response frequency are strongly influenced by the Reynolds number. Both of these Reynolds effects should be of interest to riser designers that traditionally rely on experimental data obtained at much lower Reynolds numbers. In this thesis, I propose a dimensionless parameter, [gamma], that governs whether lock-in under unsteady flow conditions is possible and show that it is useful for determining a priori whether the response under unsteady conditions will be similar to the response under steady flows. The unsteady flow parameter, [gamma], describes the change in flow speed per cycle of cylinder vibration and is defined as: ... The experimental data necessary to support this work is taken from a set of experiments performed at the State Key Laboratory of Ocean Engineering at Shanghai Jiao Tong University (SJTU), where a 4[gamma] long flexible cylinder was towed through an ocean basin under carefully selected amounts of acceleration/deceleration. Analysis of the experimental data showed that the response can typically be divided into three regimes based on the [gamma] value: For very quickly accelerating flows ([gamma] > 0.1) the cylinder cannot react quickly enough and at most a couple of cycles of small amplitude vibration will be observed. For moderately accelerating flows (0.02 < [gamma] < 0.1), the cylinder will typically start vibrating and can build up a significant response. However, most of the time, the flow will have exited the required synchronization region before the cylinder manages to reach the large amplitudes observed in steady flows. For very slowly accelerating flows ([gamma] < 0.02), the flow is changing considerably slower than the cylinder's reaction time and thus, the cylinder has more than enough time to build up its response. Under these conditions, the observed response is qualitatively similar to the response of flexible cylinders in steady flows. The [gamma] dependence that was identified in the SJTU data is not limited to that specific situation but instead, is a general property of low mass ratio cylinders vibrating in unsteady flows. This is shown by demonstrating how the unsteady flow parameter, [gamma], can be used to analyze unsteady response data from the aforementioned SHELL tests where the riser models were considerably longer than the SJTU model. This thesis shows how a single ramp test -- where the towing speed is continuously varied in a control manner -- may be used to obtain the same information as 10 constant speed tests covering the range of speeds. This can and will significantly reduce the number of runs necessary to completely characterize the VIV response of flexible cylinders and will translate into large cost savings in the future. The thesis closes by describing the differences observed in the VIV response at high mode numbers depending on whether the time-varying flow was accelerating or decelerating. In both situations a 'hysteresis' effect is noted, where the cylinder is found to 'lag behind' preferring to vibrate in the previously excited mode as a result of cylinder lock-in. In accelerating flows, this means that the cylinder will typically be responding one mode lower than it would have in a steady flow. In decelerating flows, the same 'lag' or 'hysteresis' will cause the cylinder to respond one (or more) mode number(s) higher than it would have in a steady flow.
by Themistocles L. Resvanis.
Ph. D.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Flow; cylinders; induced vibration"

1

Flow-induced vibration of circular cylindrical structures. Washington: Hemisphere Pub. Corp., 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Flow-induced vibration. 2nd ed. Malabar, Fla: Krieger Pub. Co., 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Flow-induced vibration. 2nd ed. New York: Van Nostrand Reinhold, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Flow-induced vibration. Malabar, Fla: R. E. Krieger, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Blake, William K. Mechanics of flow-induced sound and vibration. Orlando, Fla: Academic Press, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

P, Anagnostopoulos, ed. Flow-induced vibrations in engineering practice. Southampton: WIT, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

International Conference on Flow-Induced Vibration (1995 London). Flow-induced vibration: Proceedings, sixth international conference on flow-induced vibration : London, United Kingdom, 10-12 April 1995. Rotterdam, Netherlands: A.A. Balkema, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Naudascher, Eduard. Flow-induced vibrations: An engineering guide. Mineola, NY: Dover Publications, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Dörfler, Peter, Mirjam Sick, and André Coutu. Flow-Induced Pulsation and Vibration in Hydroelectric Machinery. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4252-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Donald, Rockwell, ed. Flow-induced vibrations, an engineering guide. Rotterdam: A.A. Balkema, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Flow; cylinders; induced vibration"

1

Hosseini, Negar, Martin D. Griffith, and Justin S. Leontini. "Vortex Shedding and Flow-Induced Vibration of Two Cylinders in Tandem." In IUTAM Symposium on Recent Advances in Moving Boundary Problems in Mechanics, 41–52. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13720-5_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Li, Baoqing, Yang Liu, K. Lam, Wen J. Li, and Jiaru Chu. "Control of Flow-Induced Vibration of Two Side-by-Side Cylinders Using Micro Actuators." In IUTAM Symposium on Flow Control and MEMS, 387–91. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6858-4_47.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Lu, Z. Y., Y. Zhou, and C. W. Wong. "Turbulence Intensity Effect on Axial-Flow-Induced Cylinder Vibration." In Fluid-Structure-Sound Interactions and Control, 293–98. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7542-1_45.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Liu, Y., R. M. C. So, and C. H. Zhang. "Three Dimensional Modeling of Flow Induced Vibration for an Elastic Cylinder in a Cross Flow." In IUTAM Symposium on Integrated Modeling of Fully Coupled Fluid Structure Interactions Using Analysis, Computations and Experiments, 175–85. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-0995-9_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Su, T.-C., and Q. X. Lian. "On Flow-Induced Vibration of a Circular Cylinder Placed near a Plane Boundary." In Stochastic Structural Dynamics 2, 265–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84534-5_15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Oviedo-Tolentino, F., R. Romero-Méndez, F. G. Pérez-Gutiérrez, G. Gutiérrez-Urueta, and H. Méndez-Azúa. "Effect of the Inlet Flow Angle on the Vortex Induced Vibration of a Collinear Array of Flexible Cylinders." In Experimental and Computational Fluid Mechanics, 301–6. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00116-6_25.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Rennels, Donald C., and Hobart M. Hudson. "Flow-Induced Vibration." In Pipe Flow, 225–29. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118275276.ch21.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Tamil Chandran, A., T. Suthakar, K. R. Balasubramanian, S. Rammohan, and Jacob Chandapillai. "Flow Estimation Using Cross-Flow-Induced Vibration." In Lecture Notes in Mechanical Engineering, 625–51. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9809-8_46.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Dimarogonas, Andrew D., Stefanos A. Paipetis, and Thomas G. Chondros. "Flow-Induced Vibration of Rotating Shafts." In Analytical Methods in Rotor Dynamics, 77–113. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-5905-3_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Zheng, Xianghao, Yuning Zhang, Yuning Zhang, and Jinwei Li. "Intelligent Recognition of Flow-Induced Vibration Faults." In Flow-Induced Instabilities of Reversible Pump Turbines, 75–91. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18057-6_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Flow; cylinders; induced vibration"

1

Takano, W., K. Tozawa, M. Yokoi, M. Nakai, and I. Sakamoto. "The Flow-Induced Vibration of Cylinders in a Cross Flow." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32711.

Full text
Abstract:
Flow-induced vibrations occur in general heat exchangers and nuclear reactors. They cause the tube failures through fretting wear or fatigue. Fluid elastic instability may lead to vibration amplitudes large enough to cause tube-to-tube clashing and in such cases will lead to relatively rapid failures. Therefore mechanisms of elastic vibration induced by cross flow are significant problems for large vibration amplitudes. The aims of this study are to analyze the vibration of cylinders at various flow velocities and to get the fundamental data of design for the prevention of accidents in heat exchanger. In this study, the experimental apparatus was built so that cylinder tip motions could be measured at various flow velocities. The experiments were conducted in different cylinder arrays. The cylinder vibration was induced in normal direction to flow by an alternate vortex. Moreover, once the flow velocity was increased to a certain value, the cylinder oscillation amplitude increased rapidly with flow and had a maximum. When five cylinders were arranged in a row normal to flow, the wandering of energy was generated between the two cylinders. For three cylinders arranged in tandem, two cylinders in upstream and downstream positions mutually vibrated out of phase. For many cylinders, the entropy had the maximum at a specific flow velocity and oscillating behavior of cylinders became chaotic state which could not predict its behavior.
APA, Harvard, Vancouver, ISO, and other styles
2

Tofa, M. Mobassher, Adi Maimun, and Yasser M. Ahmed. "Effect of Upstream Cylinder’s Oscillation Frequency on Downstream Cylinder’s Vortex Induced Vibration." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66990.

Full text
Abstract:
Vortex induced vibration or widely known as VIV, is a very complex hydrodynamic phenomenon. There are relatively very few experimental and numerical references for oscillating pair of cylinders because of the early assumption that the interference between the two cylinders is weak and thus each of the cylinders may have the same behavior as found in the case of a single cylinder, but recent researches showed this assumption was not true. For tandem arrangement, several parameters govern the nature of VIV of downstream cylinders, such as spacing, upstream cylinders VIV amplitude etc. The nature of downstream cylinders response isn’t same as classical VIV or WIV (wake induced vibration). Oscillation frequency of a cylinder subjected to flow induced vibration is one of the important characteristics Oscillation frequency is highly dependent on natural frequency of the cylinder. By changing spring stiffness or mass ratio, natural frequency can be altered. The aim of this study is to investigate the effect of upstream cylinder’s oscillation frequency on the vibration of downstream cylinder. Numerical simulations have been conducted to understand the nature of vortex induced vibration (VIV) of a pair cylinder in tandem arrangement at high Reynolds numbers. Cylinders were subjected to uniform flows in sub-critical flow regime and have been allowed to oscillate in cross flow direction only. The spacing between the upstream and downstream cylinders was four times of the cylinder diameter. The oscillation frequency of the upstream cylinder has been altered by varying the mass ratio of the upstream cylinder. It was found that for same Reynolds number, downstream cylinder’s VIV amplitude is increased quite significantly if the upstream cylinder oscillates relatively slowly. The shear stress transport detached eddy turbulence model has been used for simulating the turbulent flow around the two cylinders. An advanced mesh movement known as “mesh morphing” model was employed to lessen the requirement for re-meshing which help to increase the accuracy of the prediction. Calculation of accurate results due to large domain deformations was achieved by re-positioning existing mesh points. The numerical results of a single cylinder subjected to one degree of freedom (1DOF) vibration have been compared with the available experimental results to validate the present study. The study is important in terms of designing VIVACE (Vortex Induced Vibration for Aquatic Clean Energy) converter for low speed current. In recent past, multiple cylinders have been used for VIVACE converter. So, the study of VIV of two equal-diameter cylinders in tandem arrangement at low current speed is very significant.
APA, Harvard, Vancouver, ISO, and other styles
3

Wong, Ka Wai Lawrence, David Lo Jacono, and John Sheridan. "Flow-Induced Vibration of an Elastically-Mounted Cylinder Undergoing Forced Rotation." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28814.

Full text
Abstract:
Flow-induced vibration (FIV) has received considerable attention in recent decades. However, investigations of elastically-mounted cylinders undergoing forced rotation are limited. The present study aims to experimentally investigate the vibration response of a circular cylinder undergoing free transverse oscillations and forced rotation at a low mass ratio. The experiments were conducted in a free surface water channel on a cylinder attached to a motor and supported on an air bearing to provide low damping transverse oscillations and cylinder rotation. The amplitude response at constant rotation rates (α) of α = 1, 2 exhibits free oscillation response behaviour. Held at a constant reduced velocity, increasing α did not monotonically decrease the amplitude response of the cylinder. At reduced velocities associated with the upper branch response the oscillation amplitude increased until α = 2. At α = 2, the peak amplitude increased by 57% over a non-rotating cylinder. The cylinder’s oscillation frequency response is similar to that of a non-rotating cylinder with marginal reduction.
APA, Harvard, Vancouver, ISO, and other styles
4

Neumeister, Roberta F., Adriane P. Petry, and Sergio V. Möller. "Flow-Induced Vibration in a Single Row of Cylinders With p/D = 1.26." In ASME 2021 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/pvp2021-62989.

Full text
Abstract:
Abstract Crossflow over a row of cylinders with a close space ratio presents an asymmetric configuration with large and narrow wakes behind the cylinders. The wake interaction can impact the vibration response of the cylinders. In tube banks, the impact results in damages to the equipment. The present experimental study aims to analyze the influence of close space observed in a single row of cylinders on the flow-induced vibration. The study compares a single row with fixed cylinders and a single row with one cylinder free to vibrate. The cylinder free to vibrate is tested in four configurations. The study was conducted with an aerodynamic channel with a cross-section of 0.193 × 0.146 m and smooth cylinders with a diameter of 25.1 mm, space ratio is 1.26. The measurements are executed with hot-wire anemometry and accelerometers, for the cases with one cylinder free to vibrate and with hot-wire anemometry and microphones for the case with all fixed cylinders. The Reynolds number ranges between 1.0 × 104 and 4.5 × 104, obtained with the reference flow velocity, measured with a Pitot tube, and the cylinder diameter. The comparison between the wake response for single row fixed and single row and free to vibrate are executed using Fourier transform and Wavelet Transform. The comparison of the results with the models presented in the literature to predict the elastic instability of the fluid in a single row of cylinders is performed.
APA, Harvard, Vancouver, ISO, and other styles
5

Joshi, Vaibhav, Bin Liu, and Rajeev K. Jaiman. "Flow-Induced Vibrations of Riser Array System." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54695.

Full text
Abstract:
When a riser array system is subjected to a uniform flow, an unstable flow-induced vibration commonly occurs among cylinders, generally called fluid-elastic instability. It can cause long-term or short-term damage to the riser array system. A numerical investigation has been performed in the present study. Generally, flow-induced vibrations include vortex-induced vibration (VIV), wake-induced vibration (WIV), jet switching, turbulent buffeting and fluid-elastic instability. The dynamic interactions among the fluid-induced vibrations, wake interference and proximity interference pose difficulties in the design and operation of the riser array system. The dynamics of a riser array system is very different from that of basic canonical configurations such as side-by-side, tandem and staggered arrangements. In a riser array system, the interferences come from all possible nearby constituent risers. There is a synchronization phenomenon among the cylinders, which may lead to detrimental collisions and short-term failures. It is known that the vortex-induced vibration (VIV) of an isolated circular cylinder is self-limiting. An extensive vibration occurs in the lock-in region within which the frequency of the vortex shedding matches the structural frequency of the immersed structure. In a riser array system, there is a point at which the vibration of cylinder suddenly increases. The vibration of the constituent risers increases without bound with the increment of the free-stream velocity. This free-stream velocity is defined as the critical velocity. The interference not only comes from the inline and cross-flow directions, but also the wake interference from the diagonal upstream risers. In a riser array system, each riser vibrates independently. However, there is symmetry of frequency spectrum observed about the inline direction along the middle row of the risers. In this study, the dynamic response of the different risers in the array system is investigated with the help of the amplitude response results from the canonical arrangements (side-by-side and tandem) and wake flow structures. The long top-tensioned riser system can be idealized by two-dimensional elastically mounted cylinders to solve the complex fluid-structure interaction problem. The dynamic response of a typical riser array system has been analyzed at low and high Reynolds number. It is encouraging to see that the results reported in the present investigation can provide useful insight and suggestions in the design and optimization of riser systems to avoid collisions and various long-or short-term failures.
APA, Harvard, Vancouver, ISO, and other styles
6

Liu, Bin, and Rajeev K. Jaiman. "The Effect of Gap Flow on Vortex-Induced Vibration of Side-by-Side Cylinder Arrangement." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54736.

Full text
Abstract:
A numerical investigation of vortex-induced vibration (VIV) of a pair of identical circular cylinders placed side by side in an uniform flow has been performed. One of the cylinder is elastically mounted and only vibrates in the transverse direction, while its counterpart remains stationary. When two cylinders are placed sufficiently close to each other, a flip-flopping phenomenon can be an additional time-dependent disturbance in the range of 0.2 ≲ g* ≲ 1.2. This phenomenon was well-reported by the experimental work of Bearman and Wadcock [1] in a side-by-side circular cylinder arrangement, in which the gap flow biased toward one of the cylinders and switched the sides intermittently. Albeit one of the two cylinders is free to vibrate, this flip-flopping during VIV dynamics can still be observed. In the side-by-side arrangement, the lock-in region shrinks due to the presence of its stationary counterpart and occurs prematurely compared to that of an isolated counterpart. Similar to the tandem cylinder arrangement, in the post lock-in region, the vibration amplitude is amplified compared to the isolated counterpart. For the vibrating cylinder in the side-by-side arrangement, the biased gap flow shows a quasi-stable flow regime within the lock-in region, instead of a bi-stable regime which is reported in the stationary side-by-side arrangement. When these factors take place simultaneously, the dynamics of freely vibrating cylinder becomes complex and such a side-by-side canonical arrangement is common in offshore engineering applications, for example a floating platform operating in the side of FPSO, arrays of riser and pipelines, ships travelling in rows within close proximity and many other side-by-side operations. The chaotic fluctuation and large vibration may occur when two bluff bodies are placed closely. It often causes inevitable damages and potential risks to the offshore structures and may leads to a collision or long-term fatigue failure associated with flow-induced vibrations.
APA, Harvard, Vancouver, ISO, and other styles
7

Munir, Adnan, Ming Zhao, and Helen Wu. "Vortex-Induced Vibration of Two Side-by-Side Cylinders With a Small Gap in Uniform Flow." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61178.

Full text
Abstract:
Vortex-induced vibrations of two elastically mounted and rigidly coupled circular cylinders in side-by-side arrangement in steady flow are investigated numerically. The vibration of the cylinders is limited to the cross-flow direction only. The three-dimensional Navier-Stokes equations are solved using the Petrov-Galerkin Finite element method and the equation of motion is solved using the fourth order Runge Kutta method. It is well known that when the gap between two stationary side-by-side cylinders is very small, the flow between the two cylinders is biased towards one cylinder and the lift force on each cylinder is significantly smaller than that of an isolated single cylinder. The aim of this study is to investigate the effect of a small gap ratio of 0.5 between the two cylinders on the lock-in regime and the amplitude of the vibration of two side-by-side cylinders in a fluid flow. Simulations are carried out for a constant mass ratio of 2, a constant Reynolds number of 1000 and a range of reduced velocities. It is found that in the lock-in range of the reduced velocity, the two cylinders vibrate about their balance position with high amplitudes. Outside the lock-in regime the flow from the gap becomes biased towards one cylinder, which is similar to that from the gap between stationary cylinders.
APA, Harvard, Vancouver, ISO, and other styles
8

Tofa, M. Mobassher, Adi Maimun, Yasser M. Ahmed, and Saeed Jamie. "Numerical Study of the Flow-Induced Vibration of Two Equal-Diameter Cylinders in Tandem With Varying the Mass Ratio." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23200.

Full text
Abstract:
Mass ratio is an important parameter that influences the vortex-induced vibration of circular cylinder, especially for a two degree of freedom system. Numerical simulations have been performed for two equal-diameter cylinders with different mass ratios in tandem arrangement which are subjected to uniform flows in subcritical flow regime. The distances between the upstream and downstream cylinders were three and four times of the cylinder diameter. The purpose of this study is to investigate the effect of upstream cylinder’s mass ratio on the vibration of downstream cylinder. The shear stress transport detached eddy turbulence model has been used for simulating the turbulent flow around the two cylinders. The numerical results of a single cylinder subjected to 2DOF vibration have been compared with the experimental results available for such cases to validate the present study.
APA, Harvard, Vancouver, ISO, and other styles
9

Xu, Jie, Don Spencer, Alex Gardner, David Molynuex, Wei Qiu, Neil Bose, Rodney H. Masters, and John Shanks. "Wake Fields Behind Risers Undergoing Vortex-Induced Vibration." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57068.

Full text
Abstract:
This paper presents measurements of the wake field behind three riser models obtained by using a Digital Particle Image Velocimetry (DPIV). The three riser models were a circular rigid cylinder, a cylinder fitted with fairings and a cylinder fitted with strakes. The models were free to vibrate in the cross-flow direction when towed in a uniform flow. The range of tested Reynolds number based on the diameter of the cylinder was from 3×104 to 2.5×105. The measurement results showed that the transverse vibration amplitudes for both the faired and straked cylinder were far less than those of the bare cylinder. Based on the wake flow field comparison between the models tested it was found that the modes of vortex shedding observed behind the bare cylinder did not occur behind either the faired or straked cylinder. This reveals that the vibrations responses of the cylinders are directly related to their wake modes. Strong, regularly shed vortices induce large amplitude vibration and weak, scattered vortices lead small amplitude or no vibration. The different wake patterns are presented for the three cylinders.
APA, Harvard, Vancouver, ISO, and other styles
10

Guo, Kai, Yuxuan Cheng, Xiantao Fan, Hongsheng Zhang, and Wei Tan. "An Investigation on Vortex Induced Vibration and Wake Induced Galloping in Tandem Cylinders System." In ASME 2022 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/pvp2022-84537.

Full text
Abstract:
Abstract The flow-induced vibration (FIV) of multi cylinders is a problem involving the safety of fluid engineering and energy harvesting. Due to the effect of wake galloping and vortex induced vibration (VIV), the mechanism of two tandem cylinders is more complex than that of a single cylinder. In this study, the vibration modes of two tandem cylinders with different spans (L/D = 1.5–4.0) are investigated at subcritical Reynolds number and high mass damping ratio through wind tunnel tests. In the experiment, the cylinders are free to vibrate in the transverse and in-flow direction. The characteristics of the vibration amplitude and vibration frequency response are discussed with the vibration mode. The results show that the vibration mode is related to the reduced pitches between the cylinders. The vibration of the two tandem cylinder system is combines results of vortex induced vibration and wake induced galloping (WIG). When the span is lower than 2.0, the galloping effect is more obvious than that of larger spans cylinders at the experiment mass damping parameters. The two cylinders turn to vibrate separately as the span grows larger.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Flow; cylinders; induced vibration"

1

Chen, S. S. Flow-induced vibration: 1992. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/10103206.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Chen, S. S. Flow-induced vibration: 1992. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/7005247.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Chen, Shoei-Sheng. Flow-Induced Vibration of Circular Cylindrical Structures. Office of Scientific and Technical Information (OSTI), June 1985. http://dx.doi.org/10.2172/6331788.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Collins, J., C. L. Doose, J. N. Attig, and M. M. Baehl. Canted undulator front-end exit-mask flow-induced vibration measurements. Office of Scientific and Technical Information (OSTI), November 2004. http://dx.doi.org/10.2172/843175.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Olinger, David J., and Michael A. Demetriou. Low-Dimensional Modeling of Flow-Induced Vibration with Coupled Map Lattices. Fort Belvoir, VA: Defense Technical Information Center, January 2002. http://dx.doi.org/10.21236/ada410638.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Merzari, E., J. M. Solberg, P. F. Fischer, and R. M. Ferencz. A High-Fidelity Approach for the Simulation of Flow-Induced Vibration. Office of Scientific and Technical Information (OSTI), April 2016. http://dx.doi.org/10.2172/1559409.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Mulcahy, T. M. Leakage flow-induced vibration of an eccentric tube-in-tube slip joint. Office of Scientific and Technical Information (OSTI), August 1985. http://dx.doi.org/10.2172/5043218.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Chowdhury, Mostafiz R., Robert L. Hall, and Eileen Pesantes. Flow-Induced Vibration Experiments for a 1:25-Scale-Model Flat Wicket Gate. Fort Belvoir, VA: Defense Technical Information Center, August 1997. http://dx.doi.org/10.21236/ada329308.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Brockmeyer, L., and J. Solberg. One-Way Coupled Flow-Induced Vibration Analysis for a Twisted-Tube Heat Exchanger. Office of Scientific and Technical Information (OSTI), October 2019. http://dx.doi.org/10.2172/1572624.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Mohanty, Subhasish, and Richard Vilim. Physics-Infused AI/ML Based Digital-Twin Framework for Flow-Induced-Vibration Damage Prediction in a Nuclear Reactor Heat Exchanger. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1830413.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Flow; cylinders; induced vibration' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography