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fluid-structure interaction of Brezina arch dam: 3D modal analysis

ENGINEERING structureS 2015年第Feb.1期84卷 19-28页

作者： Amina, Tahar Berrabah Mohamed, Belharizi Andre, Laulusa Abdelmalek, Bekkouche Univ Ctr Ain Temouchent Smart Struct Lab Dept Civil Engn Tabriz 46000 Algeria Oakridge SAS F-45000 Orleans France

In this paper, modal responses of the Brezina concrete arch dam, Algeria, are determined using the finite elements commercial packages ANSYS. The dam-water-foundation soil system is investigated based on the added mass and Lagrangian approaches. The former approach is simpler and less costly but cannot provide the sloshing frequencies. Furthermore, as reported by other researchers, the added mass approach gives higher coupled frequencies as compared to the actual ones, which are better approximated by those obtained from the Lagrangian approach. The natural frequencies of the dam-water-massless foundation model are well below those of the dam-massless foundation model (without water). But, unexpectedly, the frequencies of the dam-water-foundation model are higher than those of the dam-foundation model. This contrasts with the results of other arch dams, including the Morrow Point dam. The results found herein are likely due to the geometric characteristics of the Brezina dam, which are not typically those of an arch dam. Lastly, considering the coupled mode that yields the largest effective mass, its frequency moderately decreases with the increase of the water level, except for the 10 m water height at which the natural frequency is the highest. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Modal analysis Arch dam fluid-structure interaction Lagrangian approach Added mass approach

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fluid-structure interaction study on the performance of flexible articulated caudal fin

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ADVANCED ROBOTICS 2014年第24期28卷 1665-1676页

作者： Liu, Bo Zhang, Shiwu Qin, Fenghua Yang, Jie Univ Sci & Technol China Dept Precis Machinery & Precis Instrumentat Hefei 230026 Anhui Peoples R China Univ Sci & Technol China Dept Modern Mech Hefei 230026 Anhui Peoples R China

In this paper, the propulsive performance of a flexible articulated caudal fin is investigated by fluid-structure interaction. The caudal fin is composed of two links which are connected by a hinge. One link is driven by pitching motion while the other one moves passively. Five cases of link flexibility are investigated, namely, the rigid-rigid case, the medium flexible-medium flexible case, the flexible-flexible case, the rigid-flexible case and the flexible-rigid case. Their fluid field and structure deformations are analysed and hydrodynamic forces are compared. It is found that the rigid-rigid caudal fin produces larger thrust force than other cases with a low-pitching frequency, while the rigid-flexible case performs better with a higher frequency. The mean thrust force increases with the frequency in our experiments, however, for the medium flexible-medium flexible case, an optimal frequency exists. Besides, the effect of the hinge stiffness is studied. It is seen that the medium flexible-medium flexible case exhibits a striking performance. When the hinge stiffness decreases, its mean thrust force increases and possesses larger amplitude while the forces of other cases decrease. These results can guide the design of flexible propeller with links and will be useful for the development of flexible underwater robots.

关键词： articulated caudal fin flexibility fluid-structure interaction hydrodynamic forces

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fluid-structure interaction Analysis of Ruptured Mitral Chordae Tendineae

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ANNALS OF BIOMEDICAL ENGINEERING 2017年第3期45卷 619-631页

作者： Toma, Milan Bloodworth, Charles H. Pierce, Eric L. Einstein, Daniel R. Cochran, Richard P. Yoganathan, Ajit P. Kunzelman, Karyn S. Georgia Inst Technol Wallace H Coulter Dept Biomed Engn Technol Enterprise PkSuite 200 Atlanta GA 30313 USA Emory Univ Technol Enterprise PkSuite 200 Atlanta GA 30313 USA St Martins Univ Dept Mech Engn 5000 Abbey Way SE Lacey WA 98503 USA Univ Maine Dept Mech Engn 219 Boardman Hall Orono ME 04469 USA

The chordal structure is a part of mitral valve geometry that has been commonly neglected or simplified in computational modeling due to its complexity. However, these simplifications cannot be used when investigating the roles of individual chordae tendineae in mitral valve closure. For the first time, advancements in imaging, computational techniques, and hardware technology make it possible to create models of the mitral valve without simplifications to its complex geometry, and to quickly run validated computer simulations that more realistically capture its function. Such simulations can then be used for a detailed analysis of chordae-related diseases. In this work, a comprehensive model of a subject-specific mitral valve with detailed chordal structure is used to analyze the distinct role played by individual chordae in closure of the mitral valve leaflets. Mitral closure was simulated for 51 possible chordal rupture points. Resultant regurgitant orifice area and strain change in the chordae at the papillary muscle tips were then calculated to examine the role of each ruptured chorda in the mitral valve closure. For certain subclassifications of chordae, regurgitant orifice area was found to trend positively with ruptured chordal diameter, and strain changes correlated negatively with regurgitant orifice area. Further advancements in clinical imaging modalities, coupled with the next generation of computational techniques will enable more physiologically realistic simulations.

关键词： Chordae tendineae Mitral valve Comprehensive model fluid-structure interaction Computer simulation Chordal rupture

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fluid-structure interaction analysis of ship-ship collisions

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MARINE structureS 2017年 55卷 121-136页

作者： Song, Ming Ma, Jun Huang, Yi Dalian Univ Technol Sch Naval Architecture & Ocean Engn Dalian Peoples R China Norwegian Univ Sci & Technol Dept Marine Technol Trondheim Norway

The Arbitrary Lagrangian Eulerian (ALE) fluid-structure interaction (FSI) method is widely used to simulate ship-ship/ship-ice collisions, in which hydrodynamics are incorporated to estimate a more realistic and reliable collision response. The purpose of this paper was to use the ALE FSI method for parametric studies on ship collision results, in which the contact force and the ship motions were calculated simultaneously. Numerical simulations of a collision between two identical ships have been conducted using the ALE FSI analysis technique of the LS-DYNA code, in which the surrounding fluid flow was explicitly modeled. The effects of the forward velocity of the struck ship, the mass of the struck ship and the collision angle on collision response were investigated. Furthermore, the analytical method based on momentum conservation and the constant added mass (CAM) method in which the hydrodynamic effects were treated as a constant added mass were applied to calculate energy dissipation. The results were compared with those in the FSI method. Discussions and conclusions are presented. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Numerical simulation Arbitrary Lagrangian Eulerian fluid-structure interaction Ship-ship collision Constant added mas

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fluid-structure interaction analysis in microfluidic devices: A dimensionless finite element approach

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2012年第9期68卷 1073-1086页

作者： Afrasiab, Hamed Movahhedy, Mohammad R. Assempour, Ahmad Sharif Univ Technol Dept Mech Engn Tehran Iran

In this paper, the so-called small time-step instability in finite element simulation of the fluid part is considered in fluid-structure interaction (FSI) problems in which a high-frequency vibrating structure interacts with an incompressible fluid. Such a situation is common in many microfluid manipulating devices. A treatment has been proposed that uses the dimensionless set of FSI governing equations in order to scale up the problem time step to a proper level that precludes the potential small time-step instability. Two-dimensional and three-dimensional finite element simulations of a mechanical micropumping device are performed to verify the efficiency of the presented approach. Solid structure vibrations of high frequency and nano-scale amplitude are used to derive the fluid flow in this kind of micropump. Results of FEM simulations are in good agreement with experimental data. The fluid problem is formulated and solved in arbitrary Lagrangian-Eulerian description. Copyright (c) 2011 John Wiley & Sons, Ltd.

关键词： fluid-structure interaction finite element simulation small time instability microfluidic devices arbitrary Lagrangian-Eulerian method

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fluid-structure interaction by the discontinuous-Galerkin method for large deformations

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2009年第1期77卷 30-49页

作者： Wang, Hongwu Belytschko, Ted Northwestern Univ Dept Mech Engn Evanston IL 60208 USA

A discontinuous-Galerkin method for large deformation fluid-structure interaction problems is developed. The fluid-structure interface can be arbitrarily aligned relative to the fluid grid. An Eulerian description is used for the fluid with a Lagrangian description of the solid. Results are presented for several examples that show excellent agreement with immersed/fictitious element methods. Copyright (C) 2008 John Wiley & Sons, Ltd.

关键词： fluid-structure interaction discontinuous Galerkin Eulerian Lagrangian large deformation

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fluid-structure interaction computations for geometrically resolved rotor simulations using CFD

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WIND ENERGY 2016年第12期19卷 2205-2221页

作者： Heinz, Joachim C. Sorensen, Niels N. Zahle, Frederik Tech Univ Denmark Dept Wind Energy Riso CampusFrederiksborgvej 399 DK-4000 Roskilde Denmark

This paper presents a newly developed high-fidelity fluid-structure interaction simulation tool for geometrically resolved rotor simulations of wind turbines. The tool consists of a partitioned coupling between the structural part of the aero-elastic solver HAWC2 and the finite volume computational fluid dynamics (CFD) solver EllipSys3D. The paper shows that the implemented loose coupling scheme, despite a non-conservative force transfer, maintains a sufficient numerical stability and a second-order time accuracy. The use of a strong coupling is found to be redundant. In a first test case, the newly developed coupling between HAWC2 and EllipSys3D (HAWC2CFD) is utilized to compute the aero-elastic response of the NREL 5-MW reference wind turbine (RWT) under normal operational conditions. A comparison with the low-fidelity but state-of-the-art aero-elastic solver HAWC2 reveals a very good agreement between the two approaches. In a second test case, the response of the NREL 5-MW RWT is computed during a yawed and thus asymmetric inflow. The continuous good agreement confirms the qualities of HAWC2CFD but also illustrates the strengths of a computationally cheaper blade element momentum theory (BEM) based solver, as long as the solver is applied within the boundaries of the employed engineering models. Two further test cases encompass flow situations, which are expected to exceed the limits of the BEM model. However, the simulation of the NREL 5-MW RWT during an emergency shut down situation still shows good agreements in the predicted structural responses of HAWC2 and HAWC2CFD since the differences in the computed force signals only persist for an insignificantly short time span. The considerable new capabilities of HAWC2CFD are finally demonstrated by simulating vortex-induced vibrations on the DTU 10-MW wind turbine blade in standstill. Copyright (c) 2016 John Wiley & Sons, Ltd.

关键词： fluid-structure interaction FSI loose coupling aeroelasticity full rotor simulations CFD standstill vibrations HAWC2CFD

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fluid-structure interaction analysis of a lightweight sandwich composite structure for solar central receiver heliostats

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MECHANICS BASED DESIGN OF structureS AND MACHINES 2023年第10期51卷 5737-5766页

作者： Fadlallah, Sulaiman O. Anderson, Timothy N. Nates, Roy J. Univ Huddersfield Sch Comp & Engn Huddersfield W Yorkshire England Auckland Univ Technol Dept Mech Engn Auckland New Zealand

Central tower concentrating solar power systems are moving to the forefront to become the technology of choice for generating renewable electricity, but their widespread implementation is limited by cost. Heliostats contribute almost 50% to the plant's cost and are thus the most significant element in central tower systems. For both large and small-area heliostats, the drive elements demonstrate the largest cost element in these systems. While large-area heliostats (>100 m(2)) have proven offer the best economy compared to other sizes, they require high-torque drives due to the heavy steel-based support structure. Heliostat costs could be reduced by decreasing the support structure's weight, avoiding large drive units and reducing energy consumption. However, the structure must be able to cope with the aerodynamic loads imposed upon them during operation. Although honeycomb sandwich composites have been widely used where high structural rigidity and low weight are desired, there is an absence of studies that rigorously investigated their suitability as the structure for heliostat mirror. Here, a fluid-structure interaction study investigated, for several loading conditions at various tilt and wind incidence angles, the aero-structural behavior characteristics of honeycomb sandwich composites used as a heliostat support structure. The honeycomb sandwich panel showed markedly different behavior characteristics at various operational conditions. The effect of tilt orientation on the sandwich panel's maximum deflection and stresses became more pronounced as wind velocity increased above 10 m/s, and increasing wind incidence angle reduced their magnitudes at different rates. The supporting components and torque tube had a noticeable wind-shielding effect, causing pronounced changes in the deflection and stresses experienced by the heliostat. The worst operational condition was at a tilt angle of 30 degrees with wind flow of 20 m/s at 0 degrees to the heliostat surface. H

关键词： Heliostat lightweight sandwich composite honeycomb fluid-structure interaction

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fluid-structure interaction simulation of the three-leaflet aortic valve using COMSOL

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COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING 2024年 1-13页

作者： Xu, Xiaoyang Cheng, Jie Xian Univ Sci & Technol Sch Comp Sci & Technol Xian Peoples R China

The simulation of the aortic valve (AV) remains challenging due to its geometric complexity and the multi-physics nature of the problem. In this study, we utilized COMSOL to establish a three-dimensional, three-leaflet AV fluid-structure interaction model and investigated the influence of material properties on the valve's mechanical behavior in a healthy state. The results indicated that variations in the aortic wall material model had a minor impact on AV hemodynamics. Additionally, while the linear elastic properties of the leaflets limit valve opening and closing, this material model allows for rapid assessment of AV performance within the range of material deformation.

关键词： Aortic valve COMSOL fluid-structure interaction material properties mechanical behavior

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fluid-structure interaction models based on patient-specific IVUS at baseline and follow-up for prediction of coronary plaque progression by morphological and biomechanical factors: A preliminary study

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JOURNAL OF BIOMECHANICS 2018年 68卷 43-50页

作者： Wang, Liang Tang, Dalin Maehara, Akiko Wu, Zheyang Yang, Chun Muccigrosso, David Zheng, Jie Bach, Richard Billiar, Kristen L. Mintz, Gary S. Southeast Univ Sch Biol Sci & Med Engn Nanjing Jiangsu Peoples R China Worcester Polytech Inst Math Sci Dept 100 Inst Rd Worcester MA 01609 USA Columbia Univ Cardiovasc Res Fdn New York NY 10027 USA Washington Univ Mallinckrodt Inst Radiol St Louis MO USA Washington Univ Sch Med Cardiovasc Div St Louis MO USA Worcester Polytech Inst Dept Biomed Engn Worcester MA USA

Plaque morphology and biomechanics are believed to be closely associated with plaque progression. In this paper, we test the hypothesis that integrating morphological and biomechanical risk factors would result in better predictive power for plaque progression prediction. A sample size of 374 intravascular ultrasound (IVUS) slices was obtained from 9 patients with IVUS follow-up data. 3D fluid-structure interaction models were constructed to obtain both structural stress/strain and fluid biomechanical conditions. Data for eight morphological and biomechanical risk factors were extracted for each slice. Plaque area increase (PAI) and wall thickness increase (WTI) were chosen as two measures for plaque progression. Progression measure and risk factors were fed to generalized linear mixed models and linear mixed-effect models to perform prediction and correlation analysis, respectively. All combinations of eight risk factors were exhausted to identify the optimal predictor(s) with highest prediction accuracy defined as sum of sensitivity and specificity. When using a single risk factor, plaque wall stress (PWS) at baseline was the best predictor for plaque progression (PAI and WTI). The optimal predictor among all possible combinations for PAI was PWS + PWSn + Lipid percent + Min cap thickness + Plaque Area (PA) + Plaque Burden (PB) (prediction accuracy = 1.5928) while Wall Thickness (WT) + Plaque Wall Strain (PWSn) + Plaque Area (PA) was the best for WTI (1.2589). This indicated that PAI was a more predictable measure than WTI. The combination including both morphological and biomechanical parameters had improved prediction accuracy, compared to predictions using only morphological features. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Coronary fluid-structure interaction Plaque progression IVUS Follow-up study

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