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Dynamic analysis of an overhead transmission line subject to gusty wind loading predicted by wind-conductor interaction

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COMPUTERS & structureS 2013年 122卷 135-144页

作者： Keyhan, Hooman McClure, Ghyslaine Habashi, Wagdi G. McGill Univ Dept Civil Engn & Appl Mech Montreal PQ H3A 0C3 Canada McGill Univ Dept Mech Engn Computat Fluid Dynam Lab Montreal PQ H3A 0C3 Canada

The authors present a new method to determine wind loading on transmission line conductors based on fluid-structure interaction (FSI) analysis. FSI results yield a more accurate representation of pressure loads acting on moving conductors than provided by the pseudo-static pressure calculation based on Bernoulli's equation, which is the current approach used in design. The results based on the proposed method are compared to those obtained using the Bernoulli load model using four natural wind records to perform a nonlinear dynamic analysis of a three-span transmission line section. The quasi-static approach significantly overestimates the conductor motion and the cable tensions. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Computational fluid dynamics fluid-structure interaction Overhead line conductors Wind loads

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Modal characteristics of a flexible cylinder in turbulent axial flow from numerical simulations

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JOURNAL OF fluidS AND structureS 2013年 43卷 110-123页

作者： De Ridder, Jeroen Degroote, Joris Van Tichelen, Katrien Schuurmans, Paul Vierendeels, Jan Univ Ghent Fac Engn & Architecture Dept Flow Heat & Combust Mech B-9000 Ghent Belgium Belgian Nucl Res Ctr Mol Belgium

In this paper the vibration behavior of a flexible cylinder subjected to an axial flow is investigated numerically. Therefore a methodology is constructed, which relies entirely on fluid-structure interaction calculations. Consequently, no force coefficients are necessary for the numerical simulations. Two different cases are studied. The first case is a brass cylinder vibrating in an axial water flow. This calculation is compared to experiments in literature and the results agree well. The second case is a hollow steel tube, subjected to liquid lead-bismuth flow. Different flow boundary conditions are tested on this case. Each type of boundary conditions leads to a different confinement and results in different eigenfrequencies and modal damping ratios. Wherever appropriate, a comparison has been made with an existing theory. Generally, this linear theory and the simulations in this paper agree well on the frequency of a mode. With respect to damping, the agreement is highly dependent on the correlation used for the normal friction coefficients in the linear theory. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Flow-induced vibrations fluid-structure interaction Eigenmode

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Numerical analysis of CFRP fluid-filled tubes subjected to high-velocity impact

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COMPOSITE structureS 2013年 96卷 286-297页

作者： Artero-Guerrero, J. A. Pernas-Sanchez, J. Varas, D. Lopez-Puente, J. Univ Carlos III Madrid Dept Continuum Mech & Struct Anal Madrid 28911 Spain

In recent years, vulnerability against high-velocity impact loads has become an increasingly critical issue in the design of composite aerospace structures. The effects of Hydrodynamic Ram (HRAM), a phenomenon that occurs when a high-energy object penetrates a fluid-filled container, are of particular concern in the design of wing fuel tanks for aircraft because it has been identified as one of the important factors in aircraft vulnerability. The projectile transfers its momentum and kinetic energy through the fluid to the surrounding structure, increasing the risk of catastrophic failure. In the present paper, the commercial finite-element code ABAQUS/Explicit has been used to simulate an HRAM event due to the impact of a steel spherical projectile into a water-filled woven CFRP square tube. In order to simulate the fluid-structure interaction, the Coupled Eulerian Lagrangian (CEL) approach is used. Experimental tests which indicate the pressure at different points of the fluid, strains of the walls and cavity evolution for different impact velocities are compared with the numerical results in order to assess the validity and accuracy of CEL technique in reproducing such a complex phenomenon. Also, several numerical impacts at different initial projectile velocities are performed to study its influence in the HRAM phenomenon. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： Carbon fiber Hydrodynamic RAM fluid-structure interaction fluid-filled tank Impact

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Numerical simulation of fluid-structure interaction of a moving flexible foil

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2008年第12期22卷 2542-2553页

作者： Shin, Sangmook Kim, Hyoung Tae Pukyong Natl Univ Dept Naval Architecture & Marine Syst Engn Pusan 608737 South Korea Chungnam Natl Univ Dept Naval Architecture & Ocean Engn Taejon 305764 South Korea

The hybrid Cartesian/immersed boundary method is applied to fluid-structure interaction of a moving flexible foil. A new algorithm is suggested to classify immersed boundary nodes based oil edges crossing a boundary. Velocity vectors are reconstructed at the immersed boundary nodes by using the interpolation along a local normal line to the boundary. For eliminating pressure reconstruction, the hybrid staggered/non-staggered grid method is adapted. The deformation of an elastic body is modeled based on dynamic thin-plate theory, TO validate the developed code first, free rotation of a foil in a channel flow is simulated and the computed angular motion is compared with other computational results. The code is then applied to the fluid-structure interaction of a moving flexible foil which undergoes large deformation due to the fluid loading Caused by horizontal sinusoidal motion. It has been shown that the moving flexible foil call generate much larger vertical force than the corresponding rigid foil and the vertical force call be attributed to the downward fluid jet due to the alternating tail deflection.

关键词： Dynamic thin-plate theory fluid-structure interaction Hybrid Cartesian/immersed boundary method Hybrid staggered/non-staggered grid

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Numerical modelling for evaluating the TMD performance in an industrial chimney

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WIND AND structureS 2013年第3期17卷 263-274页

作者： Iban, A. L. Brownjohn, J. M. W. Belver, A. V. Lopez-Reyes, P. M. Koo, K. Univ Valladolid Escuela Ingn Ind ITAP E-47011 Valladolid Spain Univ Sheffield Vibrat Engn Sect Sheffield S1 3JD S Yorkshire England CARTIF Ctr Tecnol Valladolid 47151 Spain

A numerical technique for fluid-structure interaction, which is based on the finite element method (FEM) and computational fluid dynamics (CFD), was developed for application to an industrial chimney equipped with a pendulum tuned mass damper (TMD). In order to solve the structural problem, a one-dimensional beam model (Navier-Bernoulli) was considered and, for the dynamical problem, the standard second-order Newmark method was used. Navier-Stokes equations for incompressible flow are solved in several horizontal planes to determine the pressure in the boundary of the corresponding cross-section of the chimney. Forces per unit length were obtained by integrating the pressure and are introduced in the structure using standard FEM interpolation techniques. For the fluid problem, a fractional step scheme based on a second order pressure splitting has been used. In each fluid plane, the displacements have been taken into account considering an Arbitrary Lagrangian Eulerian approach. The stabilization of convection and diffusion terms is achieved by means of quasi-static orthogonal subscales. For each period of time, the fluid problem was solved and the geometry of the mesh of each fluid plane is updated according to the structure displacements. Using this technique, along-wind and across-wind effects have been properly explained. The method was applied to an industrial chimney in three scenarios (with or without TMD and for different damping values) and for two wind speeds, showing different responses.

关键词： finite element method computational fluid dynamics fluid-structure interaction vortex shedding damping

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Numerical simulation of the dynamics of a bileaflet prosthetic heart valve using a fluid-structure interaction approach

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JOURNAL OF BIOMECHANICS 2008年第11期41卷 2539-2550页

作者： Nobili, Matteo Morbiducci, Umberto Ponzini, Raffaele Del Gaudio, Costantino Balducci, Antonio Grigioni, Mauro Montevecchi, Franco Maria Redaelli, Alberto Politecn Milan Dept Bioengn I-20133 Milan Italy Politecn Torino Dept Mech Turin Italy Interuniv Consortium CILEA Milan Italy Inst Super Sanita Technol & Hlth Dept Cardiovasc Bioengn Unit Milan Italy

The main purpose of this study is to reproduce in silico the dynamics of a bileaflet mechanical heart valve (MHV,- St Jude Hemodynamic Plus, 27 min characteristic size) by means of a fully implicit fluid-structure interaction (FSI) method, and experimentally validate the results using an ultrafast cinematographic technique. The computational model was constructed to realistically reproduce the boundary condition (72 beats per minute (bprn), cardiac output 4.51/min) and the geometry of the experimental setup, including the valve housing and the hinge configuration. The simulation was carried out coupling a commercial computational fluid dynamics (CFD) package based on finite-volume method with user-defined code for solving the structural domain, and exploiting the parallel performance of the whole numerical setup. Outputs are leaflets excursion from opening to Closure and the fluid dynamics through the valve. Results put in evidence a favorable comparison between the computed and the experimental data: the model captures the main features of the leaflet motion during the systole. The use of parallel computing drastically limited the computational costs, showing a linear scaling on 16 processors (despite the massive use of user-defined subroutines to manage the FSI process). The favorable agreement obtained between in vitro and in silico results of the leaflet displacements confirms the consistency of the numerical method used, and candidates the application of FSI models to become a major tool to optimize the MHV design and eventually provides useful information to surgeons. (C) 2008 Elsevier Ltd. All rights reserved.

关键词： prosthetic heart valve computer modelling finite-volume method dynamic analysis cardiovascular biofluid mechanics fluid-structure interaction parallel processing

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On the continuity of mean total normal stress in geometrical multiscale cardiovascular problems

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JOURNAL OF COMPUTATIONAL PHYSICS 2013年 251卷 136-155页

作者： Blanco, Pablo J. Deparis, Simone Malossi, A. Cristiano I. LNCC BR-25651075 Quitandinha Petropolis Brazil Ecole Polytech Fed Lausanne Math Inst Computat Sci & Engn MATHICSE CMCS CH-1015 Lausanne Switzerland

In this work an iterative strategy to implicitly couple dimensionally-heterogeneous blood flow models accounting for the continuity of mean total normal stress at interface boundaries is developed. Conservation of mean total normal stress in the coupling of heterogeneous models is mandatory to satisfy energetic consistency between them. Nevertheless, existing methodologies are based on modifications of the Navier-Stokes variational formulation, which are undesired when dealing with fluid-structure interaction or black box codes. The proposed methodology makes possible to couple one-dimensional and three-dimensional fluid-structure interaction models, enforcing the continuity of mean total normal stress while just imposing flow rate data or even the classical Neumann boundary data to the models. This is accomplished by modifying an existing iterative algorithm, which is also able to account for the continuity of the vessel area, when required. Comparisons are performed to assess differences in the convergence properties of the algorithms when considering the continuity of mean normal stress and the continuity of mean total normal stress for a wide range of flow regimes. Finally, examples in the physiological regime are shown to evaluate the importance, or not, of considering the continuity of mean total normal stress in hemodynamics simulations. (C) 2013 Elsevier Inc. All rights reserved.

关键词： Dimensionally-heterogeneous models Coupling conditions Geometrical multiscale modeling Total stress boundary data fluid-structure interaction

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A partitioned coupling scheme extended to structures interacting with high-density fluid flows

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COMPUTERS & fluidS 2013年 84卷 190-202页

作者： Song, M. D. Lefrancois, E. Rachik, M. Univ Technol Compiegne Roberval Lab UMR CNRS UTC 7337 F-60205 Compiegne France

This paper describes a coupling scheme for fluid-structure interaction (FSI) applications extended to high-density fluids. The scheme is based on the classical iterative partitioned approach (one solver per physics), an approach easy to implement, but which traditionally has only been used in aeroelasticity applications. As fluid density increases convergence is no longer ensured, being clearly dependent on the ratio between the total fluid mass and the mass of the structure. An approach based on the estimation of the added mass matrix is here presented in detail, and validated using the classical 1D problem of a piston in a cylinder. Results are shown for a cylinder moving in a moderate fluid flow, and the case of an elastic membrane allows conclusions to be drawn regarding the applicability of this approach to general FSI cases. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction Potential flow Rigid body motions Partitioned algorithm Added mass effect Finite element

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On the natural frequency of transversely isotropic magneto-electro-elastic plates in contact with fluid

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APPLIED MATHEMATICAL MODELLING 2013年第4期37卷 2503-2515页

作者： Chang, T. -P. Natl Kaohsiung First Univ Sci & Technol Dept Construct Engn Kaohsiung Taiwan

In this paper, the vibration characteristics of transversely isotropic magneto-electro-elastic (MEE) rectangular plates in contact with fluid are investigated. The mathematical formulation on the determination of added virtual mass for water-contacting MEE rectangular plates with uniform thickness is performed. Based on the recently proposed differential equation governing the dynamical responses of the MEE rectangular plates, a fluid-structure interaction model is established and analyzed. First of all, the added virtual mass incremental (AVMI) factor of the system is calculated by using the proposed approach and the added virtual mass can then be obtained, furthermore, the natural frequencies of the MEE rectangular plates in contact with fluid with different boundary conditions are also investigated. It is noted that the natural frequencies based on the proposed method are very useful for those engineers or researchers who are engaged in the vibration analysis and design of the MEE plate in contact with fluid. (c) 2012 Elsevier Inc. All rights reserved.

关键词： Vibration Magneto-electro-elastic (MEE) plates Added virtual mass fluid-structure interaction Added virtual mass incremental (AVMI) factor Natural frequencies

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A stable FSI algorithm for light rigid bodies in compressible flow

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JOURNAL OF COMPUTATIONAL PHYSICS 2013年 245卷 399-430页

作者： Banks, J. W. Henshaw, W. D. Sjoegreen, B. Ctr Appl Sci Comp Lawrence Livermore Natl Lab Livermore CA 94551 USA

In this article we describe a stable partitioned algorithm that overcomes the added mass instability arising in fluid-structure interactions of light rigid bodies and inviscid compressible flow. The new algorithm is stable even for bodies with zero mass and zero moments of inertia. The approach is based on a local characteristic projection of the force on the rigid body and is a natural extension of the recently developed algorithm for coupling compressible flow and deformable bodies [1-3]. The new algorithm advances the solution in the fluid domain with a standard upwind scheme and explicit time-stepping. The Newton-Euler system of ordinary differential equations governing the motion of the rigid body is augmented by added mass correction terms. This system, which is very stiff for light bodies, is solved with an A-stable diagonally implicit Runge-Kutta scheme. The implicit system (there is one independent system for each body) consists of only 3d + d(2) scalar unknowns in d = 2 or d = 3 space dimensions and is fast to solve. The overall cost of the scheme is thus dominated by the cost of the explicit fluid solver. Normal mode analysis is used to prove the stability of the approximation for a one-dimensional model problem and numerical computations confirm these results. In multiple space dimensions the approach naturally reveals the form of the added mass tensors in the equations governing the motion of the rigid body. These tensors, which depend on certain surface integrals of the fluid impedance, couple the translational and angular velocities of the body. Numerical results in two space dimensions, based on the use of moving overlapping grids and adaptive mesh refinement, demonstrate the behavior and efficacy of the new scheme. These results include the simulation of the difficult problems of shock impingement on an ellipse and a more complex body with appendages, both with zero mass. (C) 2013 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Added mass instability Moving overlapping grids Compressible fluid flow Rigid bodies

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