4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I最新文献

The Applicability of the Quasi-Steady Assumption for Two Staggered Circular Cylinders in Cross-Flow 交叉流动中两个交错圆柱准稳态假设的适用性

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0055

D. Ting, D. J. Wang, S. Price, M. Païdoussis

{"title":"The Applicability of the Quasi-Steady Assumption for Two Staggered Circular Cylinders in Cross-Flow","authors":"D. Ting, D. J. Wang, S. Price, M. Païdoussis","doi":"10.1115/imece1997-0055","DOIUrl":"https://doi.org/10.1115/imece1997-0055","url":null,"abstract":"\u0000 The applicability of the quasi-steady assumption for two staggered circular cylinders of equal diameter in cross-flow has been tested for ten geometrical arrangements, for Reynolds number (based on cylinder diameter and free-stream velocity) 4 × 104 ≤ Re ≤ 2 × 105, and reduced flow velocity 15 ≤ U/fD ≤ 300. With one cylinder stationary, the other one is forced to oscillate transversely to the flow with a half peak-to-peak amplitude / cylinder diameter ratio of 0.043, 0.047 or 0.17. The dynamic forces are deduced either from measured pressure distributions, or from direct force measurements on the cylinder, and these measurements are post-processed in the time and frequency domains, respectively. The applicability of the quasi-steady assumption is found to be strongly dependent on the relative positions of the two cylinders, in addition to U/fD. When the cylinder is in a sensitive flow region, where the spatial gradients of the static force coefficients are high, the quasi-steady assumption may not be applicable even for U/fD = 250. Away from the sensitive flow regions, the quasi-steady assumption is usually applicable for U/fD ≥ 50. In general, the fluidelastic forces depart rapidly from predictions based on the quasi-steady assumption with decreasing U/fD below the critical value.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115126578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear Lateral Vibration of a Vertical Fluid-Conveying Pipe With End Mass: Effect of Horizontal Excitation at the Upper End 带端质量的垂直输送管道的非线性横向振动:上端水平激励的影响

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0069

M. Yoshizawa, Masanobu Watanabe, Kouji Hashimoto, M. Takayanagi

引用次数: 0

Broadband and Tonal Noise of Flow Excited Cavities 流动激发态腔的宽带噪声和调性噪声

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0079

J. Bruggeman, K. Looijmans, J. Golliard

引用次数: 0

Simulation of the Incompressible Viscous Cross-Flow Around an Oscillating Circular Cylinder via the Random Vortex Method 用随机涡法模拟振荡圆柱不可压缩粘滞横流

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0039

M. Akbari, S. Price

{"title":"Simulation of the Incompressible Viscous Cross-Flow Around an Oscillating Circular Cylinder via the Random Vortex Method","authors":"M. Akbari, S. Price","doi":"10.1115/imece1997-0039","DOIUrl":"https://doi.org/10.1115/imece1997-0039","url":null,"abstract":"\u0000 The random vortex method has been used to simulate the laminar incompressible flow around a circular cylinder oscillating transversely to the flow. The vorticity in the flow is represented by a number of discrete point vortices, which are given random walks to simulate the effect of viscous diffusion. The vortices are created on the cylinder surface to satisfy the no-slip boundary condition, they are convected using an inviscid flow assumption, where the induced velocities on each of the point vortices is obtained using a vortex-in-cell method. Using a time marching algorithim based on the above procedure, the flow around stationary and oscillating circular cylinders is investigated. In particular, the effect of frequency and magnitude of the forced oscillation on the dynamic force coefficients is considered. The results obtained are compared with other numerical solutions and with available experimental data. In general, both the qualitative and quantitative agreement between the present numerical simulation and other numerical results and experiments is good.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122045139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Nonlinear Galerkin Methods Applied in the Dimension Reduction of Vibrating Fluid Conveying Tubes 非线性伽辽金法在振动流体输送管降维中的应用

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0068

A. Steindl, H. Troger, J. Zemann

{"title":"Nonlinear Galerkin Methods Applied in the Dimension Reduction of Vibrating Fluid Conveying Tubes","authors":"A. Steindl, H. Troger, J. Zemann","doi":"10.1115/imece1997-0068","DOIUrl":"https://doi.org/10.1115/imece1997-0068","url":null,"abstract":"\u0000 In this paper we use the nonlinear Galerkin method to reduce the infinite dimensional system describing the oscillations of a fluid conveying tube to a finite low dimensional system. In fact we are able to replace a system of nonlinear partial differential equations by a set of nonlinear ordinary differential equations which are the amplitude equations of the critical modes. Three important problems are addressed in this respect. First, the choice of the form of the critical modes (ansatz functions), second the choice of the number m of the critical modes and finally the construction of the reduced system. For the latter point the so-called approximate inertial manifold (AIM) theory is used. Its explanation is one of the central goals of this paper.\u0000 By means of numerical simulations for large amplitude oscillations of a fluid conveying tube we compare the results of various choices of ansatz functions and various numbers m. Further we compare the inertial manifold approximation with the flat Galerkin method which usually is used by engineers.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127953859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Numerical Study of the Effects of the Transverse Cylinder Oscillation on the Laminar Wake 横向圆柱振荡对层流尾流影响的数值研究

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0038

P. Anagnostopoulos

引用次数: 1

Estimation of an Improved Technique for Measuring a Near Wake Flow Field of a Bluff Body With a Parallel Triple-Wire Probe 用平行三丝探头测量钝体近尾迹流场的改进技术估计

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0059

R. Waka, T. Suzuki, Y. Ochiai, T. Watanabe

引用次数: 0

Investigation of Boundary Layer Behavior on Single and Tandem Cylinders 单缸和串缸边界层行为的研究

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0048

T. Lee, A. Panagakos

引用次数: 2

Failure Mechanism of a Thermocouple Well Caused by Flow-Induced Vibration: (1) — Numerical Simulation and Water Experiment of Flow-Induced Vibration 热电偶井流激振动失效机理:(1)流激振动数值模拟与水实验

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0053

A. Yamaguchi, M. Morishita, Y. Wada, K. Iwata, M. Ichimiya

{"title":"Failure Mechanism of a Thermocouple Well Caused by Flow-Induced Vibration: (1) — Numerical Simulation and Water Experiment of Flow-Induced Vibration","authors":"A. Yamaguchi, M. Morishita, Y. Wada, K. Iwata, M. Ichimiya","doi":"10.1115/imece1997-0053","DOIUrl":"https://doi.org/10.1115/imece1997-0053","url":null,"abstract":"\u0000 In this paper, flow-induced vibration analysis and experiment of the thermocouple well sustained in cross flow of Japanese Fast Breeder Reactor Monju are performed. Navier-Stokes equations coupled with equations of structural motion are solved using the finite element method. The experiment is performed in water using real scale mock-up model. The in-line oscillation mode is simulated in both experiment and analysis and the results are consistent each other. Also observed in both the experiment and analysis are the symmetric vortices that are generated at both lateral sides of the cylinder in accordance with the cylinder natural frequency. Furthermore, it has been found both in numerical simulation and experiment that the thermocouple well oscillates at decreased flow rate if the natural frequency of the thermocouple is reduced. Based on the analytical and experimental results, a displacement response diagram that relates the displacement and the reduced velocity is established.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133750439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Numerical Study of Oscillatory Flow Around Circular and Square Cylinders 圆圆柱体和方圆柱体振荡流动的数值研究

4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0051

A. Okajima, T. Yasuda

{"title":"A Numerical Study of Oscillatory Flow Around Circular and Square Cylinders","authors":"A. Okajima, T. Yasuda","doi":"10.1115/imece1997-0051","DOIUrl":"https://doi.org/10.1115/imece1997-0051","url":null,"abstract":"\u0000 The flow patterns around and the forces acting on an oscillating bluff body submerged in a fluid at rest have been studied by numerical simulations. An ALE (Arbitrary Lagrangian-Eulerian) finite difference method has been employed to simulate the flow around an oscillating bluff body, e.g., a circular cylinder and a square one, submerged in a still water. Simulations have been carried out under the assumption of 2- and 3-dimensional, unsteady, incompressible and viscous flow. The results predicted by numerical simulations are compared with our recent results of measurements of fluiddynamic forces on and flow-visualized patterns around a bluff body that is set in a planar oscillatory flow generated by a U-tube water tank up to Keulegan Carpenter (KC) numbers of 30 and at a value of β of 95 and 153. Although flow-patterns around a bluff body are complicatedly produced by both the vortex-shedding from a bluff body and the planar oscillatory flow, the major vortex-shedding regimes observed in experiments, flow pattern of “3-dimensional structures” at low KC numbers, “transverse street” and “double pair” all can be successfully reproduced in the present simulations, and there is good agreement between the simulated and measured flow patterns. Notable differences are also confirmed for flow configurations around a bluff body with a different shaped-section, e.g., a circular section and a square one. There is found to be good agreement also between the predicted and measured in-line forces, i.e., the values of drag and inertia coefficients, CD, CM, represented by the well-known Morison’s equation and the fluctuating transverse force (lift force) CL across a range of KC values. Furthermore, it is noteworthy that the values of transverse force depending on KC numbers correspond well to the process of flow pattern variation.","PeriodicalId":146109,"journal":{"name":"4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise: Volume I","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134392945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0