Volume 4: Fluid-Structure Interaction最新文献_第6页

A Study for Theoretical Modeling of Cavitation Inducement From the Solid-Fluid Interface With Fluid-Structure Interaction 流固耦合固液界面空化诱导的理论建模研究

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84811

Tomohisa Kojima, K. Inaba, Y. Takada

{"title":"A Study for Theoretical Modeling of Cavitation Inducement From the Solid-Fluid Interface With Fluid-Structure Interaction","authors":"Tomohisa Kojima, K. Inaba, Y. Takada","doi":"10.1115/PVP2018-84811","DOIUrl":"https://doi.org/10.1115/PVP2018-84811","url":null,"abstract":"A theoretical model was explored for predicting cavitation generation from a solid-fluid interface with fluid-structure interaction. Predicting cavitation generation is crucial to evaluate the lifetime of fluid machines. Cavitation has been generated from a solid-fluid interface with tensile stress (pressure) wave propagation across the interface. It was revealed that cavitation generation was suppressed when the surface wettability of the solid in a solid-fluid interface was improved (hydrophilized). It means that a condition exists in which cavitation is not generated despite the existence of bubble nuclei in water. This phenomenon cannot be explained by the conventional theory of fluid mechanics. In this study, an analogy between the theory of crack propagation in fracture mechanics and cavitation generation and propagation from a solid-fluid interface with fluid-structure interactions is developed and applied. An impact experiment was conducted with a free-falling projectile that hit a cylindrical solid buffer placed on top of a water surface within an elastic tube standing on the ground. The projectile impact created a stress wave propagating through the buffer and across the interface of the buffer and water. During the experiments, cavitation bubbles were generated from the interface of the buffer and water due to tensile wave propagation across the interface. Cavitation intensity was controlled by adding a surfactant to water. A bubble was set on the solid-fluid interface beforehand, then its growth with stress (or pressure) wave propagation was observed. The formularization of cavitation occurrence was tested by using initial crack length and stress in fracture mechanics as an analogy for the diameter of pre-set bubble and pressure wave amplitude.","PeriodicalId":185894,"journal":{"name":"Volume 4: Fluid-Structure Interaction","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134537343","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: 1

A Simplified Approach to Estimate Flow-Induced Vibrations on an Elbowed Piping System 弯管系统流致振动的一种简化估计方法

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84717

A. Baramili, L. Chatellier, L. David, L. Ancian

引用次数: 0

Comparison of Tube-Tube Collision Frequency With and Without the Use of Impingement Plate 使用与不使用冲击板时管-管碰撞频率的比较

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84729

J. Buzík, T. Létal, P. Lošák, M. Naď, M. Pernica

{"title":"Comparison of Tube-Tube Collision Frequency With and Without the Use of Impingement Plate","authors":"J. Buzík, T. Létal, P. Lošák, M. Naď, M. Pernica","doi":"10.1115/PVP2018-84729","DOIUrl":"https://doi.org/10.1115/PVP2018-84729","url":null,"abstract":"The aim of the present work is to carry out the checking of the tube bundle of heat exchanger for the occurrence of tube-tube collision caused by cross-flow vibration with and without the use of impingement plate. This will be achieved using numerical 2D CFD (computational fluid dynamics) analysis. The 2D analysis is done using ANSYS Fluent software. Tube movement in the shell side is provided by UDF (user-defined function) DEFINE_SDOF_PROPERTIES. By determining the stiffness and weight of the tubes, two-way fluid and tube interaction can be achieved. Due to limitations of 2D CFD analysis, only the occurrence of the tube-tube or tube-shell collisions can be observed. Unfortunately, the first collision causes termination of the simulation due to negative volumes in dynamic mesh. Possible solutions to the issue are also discussed in presented paper.\u0000 The analyzed geometry of the shell side is taken from the Heat Exchanger Tube Vibration Data Bank [2]. This publication collects heat exchanger data for which vibration phenomena have been reported. The above-mentioned geometry is a domain with tube bundle at the shell side under the inlet. In the same domain, both the tie rod and the seal strips and the 45° turn of the partitions are considered.","PeriodicalId":185894,"journal":{"name":"Volume 4: Fluid-Structure Interaction","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131564349","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 Proposed Guideline for Applying Waterhammer Predictions Under Transient Cavitation Conditions: Part 1 — Pressures 在瞬态空化条件下应用水锤预测的建议指南:第1部分-压力

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84338

Matthew Stewart, T. Walters, Greg Wunderlich, E. Onat

{"title":"A Proposed Guideline for Applying Waterhammer Predictions Under Transient Cavitation Conditions: Part 1 — Pressures","authors":"Matthew Stewart, T. Walters, Greg Wunderlich, E. Onat","doi":"10.1115/PVP2018-84338","DOIUrl":"https://doi.org/10.1115/PVP2018-84338","url":null,"abstract":"Waterhammer analysis (herein referred to as Hydraulic Transient Analysis or simply “HTA”) becomes more complicated when transient cavitation occurs (also known as liquid column separation). While standard HTA transient cavitation models used with analysis based on the Method of Characteristics show good correlation when compared to known test/field data, the great majority of test/field data are for simple systems experiencing a single transient. Transient cavitation in more complicated systems or from two or more independently initiated transients have not been validated against data.\u0000 Part 1 of this paper describes the various safety factors already provided by ASME B31.3 for pressure containment, provides criteria for accepting the results of HTA calculations that show the presence of transient cavitation, and makes recommendations where the user should include additional safety factors based on the transient cavitation results.\u0000 Situations are discussed where waterhammer abatement is recommended to reduce hydraulic transient pressures and forces, and for increasing confidence in HTA results in specific cases. The result is a proposed comprehensive and pragmatic guideline which practicing engineers can use to perform waterhammer analysis and apply pressure predictions to pipe stress analysis.","PeriodicalId":185894,"journal":{"name":"Volume 4: Fluid-Structure Interaction","volume":"13 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124525057","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: 1

Dynamic Instability Analysis of a Spring-Loaded Pressure Safety Valve Connected to a Pipe by Using CFD Method 基于CFD方法的管道弹簧压力安全阀动态失稳分析

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84992

F. Zheng, Chaoyong Zong, Fuzheng Qu, Wei Sun, Xueguan Song

引用次数: 2

Study on the Simplified Method of Special Supporting Structure for Steam Generator Tubes 蒸汽发生器管专用支撑结构简化方法研究

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84349

W. Tan, Songyuan Jiang, Z. Li, Zhanbin Jia, Liyan Liu

{"title":"Study on the Simplified Method of Special Supporting Structure for Steam Generator Tubes","authors":"W. Tan, Songyuan Jiang, Z. Li, Zhanbin Jia, Liyan Liu","doi":"10.1115/PVP2018-84349","DOIUrl":"https://doi.org/10.1115/PVP2018-84349","url":null,"abstract":"The flow induced vibration of tubes in the steam generator gradually attracts great attention. The natural frequency of the tube is the basic parameter for vibration analysis. The supporting structures of the tube bundle in steam generator are the cinquefoil orifice-baffle and the anti-vibration bar which is different from the common baffle plate. The issue that researchers focus on is how these supporting structures affect the natural frequency. A simplified method of the special support in the tube bundle was studied based on the numerical simulation. According to the characteristics of supporting structures, the effect of stiffness of the supporting structures on the natural frequency was studied by the spring element constraints. The results show that when the stiffness of the support structure is larger than the magnitude of 105 N/m, the stiffness has no influence on the natural frequency. The frictional force of the circumferential constraint inside the plane is too weak to constrain the tube so we need to pay more attention on the vibration inside the plane. Through changing the contact length of the support component and tubes, the effect of the contact condition on the natural frequency is studied. The results show that the contact condition has a certain effect on the natural frequency. When the support is simplified as simple support, the influence on natural frequency is small and the deviation is less than 1.5%. And there is a certain safety margin under the simplified method. In the calculation process, the special support can be simplified as simple support and the calculation results are relatively accurate and conservative.","PeriodicalId":185894,"journal":{"name":"Volume 4: Fluid-Structure Interaction","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128924348","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 Quasi-Steady In-Plane Fluidelastic Instability Analysis of a Rotated Triangular Tube Array in Two-Phase Cross Flow 旋转三角形管阵在两相交叉流中的准定常面内流体弹性不稳定性分析

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-85143

Stephen Olala, N. Mureithi

{"title":"A Quasi-Steady In-Plane Fluidelastic Instability Analysis of a Rotated Triangular Tube Array in Two-Phase Cross Flow","authors":"Stephen Olala, N. Mureithi","doi":"10.1115/PVP2018-85143","DOIUrl":"https://doi.org/10.1115/PVP2018-85143","url":null,"abstract":"In-plane fluidelastic instability is a dynamic phenomenon requiring fluid coupling of at least two degrees-of-freedom, in this case, at least two flexible tubes. Due to the nature of the mechanism causing streamwise fluidelastic instability, a purely experimental or an unsteady determination would require intensive experimental effort. As a compromise between experimental effort and prediction accuracy, the quasi-steady model is used in the current study. In the present work, previously measured quasi-steady and unsteady forces are used to estimate the time delay first between the displacement of an oscillating tube and the forces generated on itself then the time delay between the displacement of a central oscillating tube and the forces induced on the adjacent tubes. The estimated time delays are then used together with drag coefficients and derivatives to predict the in-plane fluidelastic instability in a rotated triangular tube array of P/D = 1.5 subjected to two-phase flow. The results closely replicate dynamic test results and confirm the predominance of the stiffness controlled mechanism and the potential of the quasi-steady model in accurately predicting streamwise fluidelastic instability in arrays subjected to two-phase flows.","PeriodicalId":185894,"journal":{"name":"Volume 4: Fluid-Structure Interaction","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127559101","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

Moving Liquid Column With Entrapped Gas Pocket and Fluid-Structure Interaction at a Pipe’s Dead End: A Nonlinear Spring-Mass System 带夹持气袋的移动液柱与管道末端流固耦合:非线性弹簧-质量系统

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84570

As Arris Tijsseling, Q. Hou, Z. Bozkuş

引用次数: 5

Prediction of Elbow Flow Dynamics Using Correlated Wall Pressure Data 利用相关壁压数据预测弯头流动动力学

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84712

A. Baramili, L. Chatellier, L. David, L. Ancian

引用次数: 0

Numerical Simulation on Flow Induced Vibration and Fretting Wear of a Steam Generator 蒸汽发生器流激振动及微动磨损数值模拟

Volume 4: Fluid-Structure Interaction Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84347

W. Tan, Kai Guo, Xiantao Fan, Yipeng Wang, Guorui Zhu, Liyan Liu

{"title":"Numerical Simulation on Flow Induced Vibration and Fretting Wear of a Steam Generator","authors":"W. Tan, Kai Guo, Xiantao Fan, Yipeng Wang, Guorui Zhu, Liyan Liu","doi":"10.1115/PVP2018-84347","DOIUrl":"https://doi.org/10.1115/PVP2018-84347","url":null,"abstract":"The steam generator (SG) is a key component in the PWR nuclear power plant. U-shaped tube bundles are subjected to cross flow in inlet and bend sections. According to the design standards of steam generators, short-term flow induced vibration (FIV) damage could be avoided, but wear and corrosion of tubes still exists. Both fluid and structure parameters are needed in FIV analysis. As direct modeling of SG flow field is almost infeasible, the porous medium model has been widely used instead. Using porous medium model can only obtain the gap velocity approximately by mathematical methods with many other unclear parameters. A combination method of direct modeling and porous medium model was established in this research. The direct modeling section could give the details of fluid forces and the accurate gap velocity. Using the fluid forces, explicit dynamic analyses of tube with supports were carried out to get FIV response and contact forces. In this paper, a typical SG model was studied in designed experimental conditions, and the results were compared with published literatures. The results demonstrate that the numerical simulation along with the combination model and explicit dynamic analysis can provide new methods into the flow-induced vibration and fretting wear of multi-span U-tubes which can be applied into future design for steam generators and other heat exchangers with large size.","PeriodicalId":185894,"journal":{"name":"Volume 4: Fluid-Structure Interaction","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131969587","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: 2