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A comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions

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MARINE structureS 2016年第0期49卷 58-75页

作者： Song, Ming Kim, Ekaternia Amdahl, Jorgen 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 NTNU Ctr Autonomous Marine Operat & Syst AMOS Trondheim Norway NTNU Ctr Sustainable Arctic Marine & Coastal Technol S Trondheim Norway

The constant added mass (CAM) method and the fluid-structure interaction (FSI) method are widely used to simulate ship-ship and ship-ice collisions. In the CAM method, the hydrodynamic effect of the surrounding water is treated as a constant added mass, whereas in the FSI method the surrounding fluid flow is explicitly modelled. The objective of the paper is to compare the two methods and to explain the causes of the differences in the results. We considered collision between a freshwater ice mass and a floating steel structure. For both methods, the numerical simulations were performed with the LS-DYNA software. The behaviour of the ice mass was modelled using an elliptic yield criterion and a strain-based pressure-dependent failure criterion. To ensure realistic ice behaviour, the ice model was calibrated using general trends found in laboratory and in-situ indentation tests with focus on the laboratory-grown ice and the fluid model in the LS-DYNA was verified by comparing the added mass coefficients for a spherical body and a rectangular block with the corresponding WADAM results. To validate and benchmark the numerical simulations, experimental data on ice-structure interactions in water were used, including the acceleration of the floater wall measured with the dynamic motion unit (DMU), the relative velocity between the ice mass and the floater before the impact and some images extracted from video recording of the test. The comparisons indicated that the FSI method yields better results for the motion of the floater, i.e., the acceleration of the floater wall caused by the ice mass's impact and the relative velocity were in reasonably good agreement with experimental measurements. It was also found that the CAM method was faster but predicted a higher peak contact force and more dissipated energy in the ice mass than in the FSI method. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Numerical simulation fluid-structure interaction Constant added mass Ice-structure collision Freshwater ice

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A coupled SPH-DEM model for fluid-structure interaction problems with free-surface flow and structural failure

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COMPUTERS & structureS 2016年第0期177卷 141-161页

作者： Wu, Ke Yang, Dongmin Wright, Nigel Univ Leeds Sch Civil Engn Leeds LS2 9JT W Yorkshire England De Montfort Univ Fac Technol Leicester LE1 9BH Leics England

An integrated particle model is developed to study fluid-structure interaction (FSI) problems with fracture in the structure induced by the free surface flow of the fluid. In this model, the Smoothed Particle Hydrodynamics (SPH) based on the kernel approximation and particle approximation is used to model the fluid domain in accordance with Navier-Stokes equations and the Discrete Element Method (DEM) with a parallel bond model is used to represent the real solid structure through a hexagonal packing of bonded particles. Validation tests have been carried out for the DEM model of the structure with deformation and fracture failure, the SPH model of the fluid and the coupled SPH-DEM model of FSI without fracture, all showing very good agreement with analytical solutions and/or published experimental and numerical results. The simulation results of FSI with fracture indicate that the SPH-DEM model developed is capable of capturing the entire FSI process from structural deformation to structural failure and eventually to post-failure deformable body movement. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Discrete Element Method Smoothed Particle Hydrodynamics fluid-structure interaction Free surface flow Fracture

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Reduced-order modeling of fluid-structure interaction and vortex-induced vibration systems using an extension of Jourdain's principle

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JOURNAL OF SOUND AND VIBRATION 2016年 382卷 193-212页

作者： Mottaghi, S. Benaroya, H. Rutgers State Univ Dept Mech & Aerosp Engn New Brunswick NJ USA WJ Hughes Tech Ctr Struct & Mat Sect Fed Aviat Adm Atlantic City NJ USA

A first-principles variational approach is proposed for reduced-order modeling of fluid structure interaction (FSI) systems, specifically vortex-induced vibration (VIV). FSI has to be taken into account in the design and analysis of many engineering applications, yet a comprehensive theoretical development where analytical equations are derived from first principles is nonexistent. An approach where Jourdain's principle is modified and extended for FSI is used to derive reduced-order models from an extended variational formulation where assumptions are explicitly stated. Two VIV models are considered: an elastically supported, inverted pendulum and a translating cylinder, both immersed in a flow and allowed to move transversely to the flow direction. Their reduced-order models are obtained in the form of (i) a single governing equation and (ii) two general coupled equations as well as the coupled lift oscillator model. Comparisons are made with three existing models. Based on our theoretical results, and especially the reduced-order model, we conclude that the first principles development herein is a viable framework for the modeling of complex fluid structure interaction problems such as vortex-induced oscillations. Published by Elsevier Ltd.

关键词： fluid-structure interaction VIBRATION (Mechanics) FLOW (fluid dynamics) ELASTICITY fluid dynamics

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Characteristics of time-varying intracranial pressure on blood flow through cerebral artery: A fluid-structure interaction approach

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE 2016年第2期230卷 111-121页

作者： Syed, Hasson Unnikrishnan, Vinu U. Olcmen, Semih Univ Alabama Dept Aerosp Engn & Mech Tuscaloosa AL 35487 USA

Elevated intracranial pressure is a major contributor to morbidity and mortality in severe head injuries. Wall shear stresses in the artery can be affected by increased intracranial pressures and may lead to the formation of cerebral aneurysms. Earlier research on cerebral arteries and aneurysms involves using constant mean intracranial pressure values. Recent advancements in intracranial pressure monitoring techniques have led to measurement of the intracranial pressure waveform. By incorporating a time-varying intracranial pressure waveform in place of constant intracranial pressures in the analysis of cerebral arteries helps in understanding their effects on arterial deformation and wall shear stress. To date, such a robust computational study on the effect of increasing intracranial pressures on the cerebral arterial wall has not been attempted to the best of our knowledge. In this work, fully coupled fluid-structure interaction simulations are carried out to investigate the effect of the variation in intracranial pressure waveforms on the cerebral arterial wall. Three different time-varying intracranial pressure waveforms and three constant intracranial pressure profiles acting on the cerebral arterial wall are analyzed and compared with specified inlet velocity and outlet pressure conditions. It has been found that the arterial wall experiences deformation depending on the time-varying intracranial pressure waveforms, while the wall shear stress changes at peak systole for all the intracranial pressure profiles.

关键词： Biomechanics fluid-structure interaction cerebral artery intracranial pressure finite element method

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Optimal design of impeller for centrifugal compressor under the influence of one-way fluid-structure interaction

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2016年第9期30卷 3953-3959页

作者： Kang, Hyun-Su Kim, Youn-Jea Sungkyunkwan Univ Grad Sch Mech Engn Suwon 16419 South Korea Sungkyunkwan Univ Sch Mech Engn Suwon 16419 South Korea

In this study, a method for optimal design of impeller for centrifugal compressor under the influence of fluid-structure interaction (FSI) and Response surface method (RSM) was studied. Numerical simulation was conducted using ANSYS Multi-physics with various configurations of impeller geometry. Each of the design parameters was divided into 3 levels. Total 45 design points were planned by Central composite design (CCD) method, which is one of the Design of experiment (DOE) techniques. Response surfaces generated based on the DOE results were used to find the optimal shape of impeller for high aerodynamic performance. The whole process of optimization was conducted using ANSYS Design xplorer (DX). Through the optimization, structural safety and aerodynamic performance of centrifugal compressor were improved.

关键词： Centrifugal compressor Shape optimization Response surface method Design of experiments fluid-structure interaction

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A mode superpostion approach for fluid-structure interaction problems

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REVISTA INTERNACIONAL DE METODOS NUMERICOS PARA CALCULO Y DISENO EN INGENIERIA 2016年第2期32卷 79-90页

作者： Ribeiro, P. M. V. Pedroso, L. J. Univ Fed Pernambuco UFPE Dept Engn Civil Recife PE Brazil Univ Brasilia UnB Dept Engn Civil Brasilia DF Brazil

In many practical engineering applications there is the interaction of distinct domains, where coupling effects are important in assessing the structural response. A particular case is given by the interaction between a vibrating structure and a reservoir, with the latter conveniently simplified to an acoustic model. This paper presents a closed form analytical solution to the dynamic interaction problem of a framed structure and a two dimensional acoustic cavity system. Initially, eigenvalues and eigenmodes are obtained accurately and then individual contributions of each mode are combined to build the structural dynamic response. A fourth order Runge-Kutta numerical integration routine is applied on the evaluation of relative displacements. Finally, practical applications are given, where the proposed method is employed effectively in the solution of sine and seismic excitations. These results are compared to finite element models, with an excellent agreement achieved by the proposed procedure. It is also verified that the fundamental mode shape governs the dynamic response, enabling the use of simplified expressions for the generalized parameters. Immediate results include validation of numerical solutions as well as parametric studies of the involved variables. The proposed procedure can be extended for different sets of boundary conditions. (C) 2014 CIMNE (Universitat Politecnica de Catalunya). Published by Elsevier Espana, S.L.U.

关键词： fluid-structure interaction Vibroacoustics Structural dynamics Mode superposition Analytical Numerical

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Editor's Choice - fluid-structure interaction Simulations of Aortic Dissection with Bench Validation

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EUROPEAN JOURNAL OF VASCULAR AND ENDOVASCULAR SURGERY 2016年第5期52卷 589-595页

作者： Chen, H. Y. Peelukhana, S. V. Berwick, Z. C. Kratzberg, J. Krieger, J. F. Roeder, B. Chambers, S. Kassab, G. S. Calif Med Innovat Inst San Diego CA 92121 USA 3DT Holdings LLC San Diego CA USA Cook Med Res Engn Bloomington IN USA

Introduction: The blood flow and stresses in the flap in aortic dissections are not well understood. Validated fluid structure interaction (FSI) simulations of the interactions between the blood flow and the flap will provide insight into the dynamics of aortic dissections and may lead to developments of novel therapeutic approaches. Methods: A coupled, two-way blood flow and flap wall computational model was developed. The Arbitrary Lagrange-Eulerian method was used, which allowed the fluid mesh to deform. Inflow velocity waveforms from a pulse duplicator system were used in the simulations. Results: The velocities for true lumen (TL) and false lumen (FL) were not significantly different between bench and simulation. The dynamics of the TL % cross-sectional area (CSA) during the cycle was similar between the bench and computational simulations, with the TL %CSA being most reduced near peak systole of the cycle. The experimental distal measurements had significantly lower velocities, likely due to the spatially heterogeneous flow distally. The conservation of mass and validity of simulations were confirmed. Additionally, regions of stress concentrations were found on the flap leading edge, towards the corners, and through the entire vessel wall. The pressure gradient across the FL results in a net force on the flap. Conclusion: The FSI flow velocities in the TL and the FL as well as the dynamics of the CSA during the cardiac cycle were validated by bench experiments. The validated FSI model may provide insights into aortic dissection including the stresses on the dissection flap and related flow disturbance, which may be subdued by novel therapeutic approaches. Simulations of more realistic human aortic dissections and the effects of current therapeutic approaches such as stent-graft can be developed in the future using the validated computational platform provided in the present study. (C) 2016 European Society for Vascular Surgery. Published by Elsevier Ltd. All r

关键词： fluid-structure interaction Aortic dissection Validation

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Unified fractional step method for Lagrangian analysis of quasi-incompressible fluid and nonlinear structure interaction using the PFEM

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2017年第9期109卷 1219-1236页

作者： Zhu, Minjie Scott, Michael H. Oregon State Univ Sch Civil & Construct Engn 101 Kearney Hall Corvallis OR 97331 USA

The fractional step method (FSM) is an efficient solution technique for the particle finite element method, a Lagrangian-based approach to simulate fluid-structure interaction (FSI). Despite various refinements, the applicability of the FSM has been limited to low viscosity flow and FSI simulations with a small number of equations along the fluid-structure interface. To overcome these limitations, while incorporating nonlinear response in the structural domain, an FSM that unifies structural and fluid response in the discrete governing equations is developed using the quasi-incompressible formulation. With this approach, fluid and structural particles do not need to be treated separately, and both domains are unified in the same system of equations. Thus, the equations along the fluid-structure interface do not need to be segregated from the fluid and structural domains. Numerical examples compare the unified FSM with the non-unified FSM and show that the computational cost of the proposed method overcomes the slow convergence of the non-unified FSM for high values of viscosity. As opposed to the non-unified FSM, the number of iterations required for convergence with the unified FSM becomes independent of viscosity and time step, and the simulation run time does not depend on the size of the FSI interface. Copyright (c) 2016 John Wiley & Sons, Ltd.

关键词： particle methods finite element methods fluid-structure interaction Lagrangian

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A review on fluid structure interaction in hydraulic turbines: A focus on hydrodynamic damping

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ENGINEERING FAILURE ANALYSIS 2017年 77卷 1-22页

作者： Trivedi, Chirag Norwegian Univ Sci & Technol NTNU Waterpower Lab Trondheim Norway

Hydraulic turbines include stationary and rotating components. The interaction of the components, mainly between the runner blades and distributor vanes, is critical when the frequency of the rotor-stator interaction (RSI) approaches the runner natural frequency. This causes resonance in the turbine runner and the premature failure of the blades. Several turbines have experienced such problems in the last few years. The studies indicated that the added mass effect causes change in natural frequency of the runner. In the critical conditions, when the runner natural frequency is close to the RSI frequency, hydrodynamic damping is an important parameter in controlling turbomachinery blade-forced response. A reliable technique that can predict/estimate the change in the runner natural frequency due to added mass has yet to be developed. This paper reviews the investigations conducted on fluid structure interaction (FSI) focusing on the role of hydrodynamic damping during resonance, RSI and added mass effect. In specific, the review includes: (1) role of boundary layer to improve the damping effect, (2) how nearby structure and submergence level changes the damping effect, (3) dependency on mode-shape, (4) how freestream velocity and vortex shedding helps to increase damping, (5) damping during cavitation, (6) damping variation with respect to a dimensionless beta parameter and (7) damping effect during rotation. In the summary, need for the future study of FSI within the field of hydropower and how damping is important in avoiding the catastrophic failures in the early life of hydraulic turbines is discussed. 2017 Elsevier Ltd. All rights reserved.

关键词： fluid-structure interaction HYDRAULIC turbine design & construction HYDRODYNAMICS DAMPING (Mechanics) TURBOMACHINE blades DESIGN & construction

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A Robust Immersed Boundary-Lattice Boltzmann Method for Simulation of fluid-structure interaction Problems

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Communications in Computational Physics 2016年第6期20卷 156-178页

作者： Jie Wu Jing Wu Jiapu Zhan Ning Zhao Tongguang Wang Department of Aerodynamics Nanjing University of Aeronautics and AstronauticsYudao Street 29Nanjing 210016JiangsuChina

A robust immersed boundary-lattice Boltzmann method(IB-LBM)is proposed to simulate fluid-structure interaction(FSI)problems in this *** with the conventional IB-LBM,the current method employs the fractional step technique to solve the lattice Boltzmann equation(LBE)with a forcing ***,the non-physical oscillation of body force calculation,which is frequently encountered in the traditional IB-LBM,is suppressed *** is of importance for the simulation of FSI *** the meanwhile,the no-slip boundary condition is strictly satisfied by using the velocity correction ***,based on the relationship between the velocity correction and forcing term,the boundary force can be calculated accurately and easily.A few test cases are first performed to validate the current ***,a series of FSI problems,including the vortex-induced vibration of a circular cylinder,an elastic filament flapping in the wake of a fixed cylinder and sedimentation of particles,are *** on the good agreement between the current results and those in the literature,it is demonstrated that the proposed IB-LBMhas the capability to handle various FSI problems effectively.

关键词： Immersed boundary-lattice Boltzmann method fractional step suppression of force non-physical oscillation fluid-structure interaction

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