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Conference on Bioinspiration, Biomimetics, and Bioreplication

作者： Anh Tuan Nguyen Han, Jae-Hung Korea Adv Inst Sci & Technol Dept Aerosp Engn 291 Daehak Ro Daejeon South Korea

ISBN: (纸本)9781510600386

In this paper, an insect wing structure is modeled based on data obtained from measurements on real hawkmoth (Manduca Sexta) wings. The aerodynamics of insect wings is simulated by an extended unsteady vortex-lattice method. The finite-element model of a flexible hawkmoth wing is built and validated. A computer program, which couples the finite-element model with the aerodynamic model, is used to study the effects of fluid-structure interaction. Some important features due to the fluid-structure interaction in hovering and forward flight are observed in the present study.

关键词： flexible insect wing unsteady vortex-lattice method fluid-structure interaction

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VALIDATION STUDY OF SMOOTHED PARTICLE HYDRODYNAMICS IN fluid AND structure interaction AND THE COMPARISON TO BOUNDARY ELEMENT METHOD 36

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36th ASME International Conference on Ocean, Offshore and Arctic Engineering

作者： Nhu Nguyen Thiagarajan, Krish P. Cameron, Mathew Univ Maine Dept Mech Engn Orono ME 04469 USA Univ Maine Adv Struct & Composites Ctr Orono ME USA

ISBN: (纸本)9780791857649

The purpose of this research is to validate the usage of Smoothed Particle Hydrodynamics (SPH) method in solving fluid-structure interaction problems as well as study its advantages and disadvantages compared to another well-known technique Boundary Element Method (BEM). The goal is achieved by 1) evaluating the Response Amplitude Operator (RAO) and 2) analyzing the drifting motion of a 1:10 scaled 3m-discus oceanographic buoy developed by the National Oceanographic and Atmospheric Administration (NOAA), using both experimental and numerical approaches. For the experimental study, the testing was carried out in an 8-m long wave tank and the buoy motions were measured using non intrusive techniques. For numerical analysis, the project used DualSPHysics open source code - and ANSYS AQWA - one of the leading software widely used in the marine applications to simulate all the experimental scenarios via SPH and BEM techniques respectively. It is observed that while BEM has clear advantages in computational time and the ability to study applicable range of frequencies, SPH, in addition to its capability to simulate drifting motion of the floating structure, has shown to outperform the RAO predictions from BEM (especially in low frequency region). In higher frequency regions, the lack of experimental data hinders the conclusion on which method might be more suitable, as both have their own limitations.

关键词： Smoothed Particle Hydrodynamics Boundary Element Method SPH BEM Floating fluid-structure interaction

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Analysis of fluid-structure interaction for a submerged floating tunnel 2nd

Analysis of fluid-structure interaction for a submerged floa...

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2nd International Symposium on Submerged Floating Tunnels and Underwater Tunnel structures (SUFTUS)

作者： Mandara, Alberto Russo, Emilio Faggiano, Beatrice Mazzolani, Federico M. Univ Naples 2 Dept Civil Engn Design Bldg & Environm Via Roma 9 I-81031 Aversa CE Italy Univ Naples Federico II Dept Struct Engn & Architecture Ple V Tecchio I-80125 Naples Italy

The behavior of a submerged floating tunnel (SFT) exposed to a water current of variable velocity is investigated through complex numerical analyses based on the Computational fluid Dynamics (CFD) and the Finite Element Method (FEM) implemented in the ABAQUS code. An accurate modelling of turbulent phenomena is made, based on both Implicit Large Eddy Simulation and the RANS-based Spalart-Allmaras model, followed by a co-simulation procedure in which the fluid dynamics and the structural analysis are carried out separately and interfaced with each other. Circular and elliptical cross sections are considered, each of them fitted for combined railway and motorway services. The analysis is carried out in both static and dynamic way, by varying the current velocity with a given value of the residual buoyancy of the tunnel. The results emphasize the effect of the main parameters investigated, evidencing the great potentials of the adopted calculation tool for carrying out further investigations aimed at achieving useful elements for the design and optimization of the SFT. (C) 2016 The Authors. Published by Elsevier Ltd.

关键词： Submerged Floating Tunnel CFD and Structural FEM Co-simulation Analysis Water Current fluid-structure interaction

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

Optimal design of impeller for centrifugal compressor under ...

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ASME-JSME-KSME Joint fluids Engineering Conference (AJK-FED)

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

ISBN: (纸本)9780791857328

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

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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 of the splitter plate in a TBCC exhaust system during mode transition phase

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ACTA ASTRONAUTICA 2015年第Jul./Aug.期112卷 126-139页

作者： Guo, Shuai Xu, Jinglei Mo, Jianwei Gu, Rui Pang, Lina Nanjing Univ Aeronaut & Astronaut Jiangsu Prov Key Lab Aerosp Power Syst Nanjing 210016 Jiangsu Peoples R China

Splitter plate plays an important role in a turbine-based combined-cycle (TBCC) exhaust system during the mode transition phase when turbojet engine and ramjet engine operate simultaneously. Dissimilar pressure distribution on both sides of the plate has a potential origin in the aeroelastic coupling, which is an interesting topic while few research works have devoted to that aspect. To better understand the aeroelastic behavior of the plate and the corresponding dynamic flow features, an integrated fluid-structure interaction simulation is conducted under one particular operation condition during mode transition phase in the TBCC exhaust system. A finite-volume-based CFD solver FLUENT is adopted to solve the unsteady Reynolds average Navier-Stokes equations. ABAQUS, a finite-element-method-based CSD solver, is employed to compute the plate elastic deformation. A twoway interaction between the fluid and the structure is accomplished by the mesh-based parallel-code coupling interface (MpCCI) in a loosely-coupled manner. The accuracy of the coupling procedure is validated for the flutter of a flat plate in supersonic flow. Then, features of steady flow field of the TBCC exhaust system are discussed, followed by the investigation of the aeroelastic phenomenon of the splitter plate and the evolution process of the flow field pattern. Finally, performances variation of the exhaust system is obtained and discussed. The results show that the plate vibrates with decaying amplitude and reaches a dynamic stable state eventually. The thrust, lift and pitch moment of the TBCC exhaust system are increased by 0.68%, 2.82% and 5.86%, respectively, compared with the corresponding values in steady state which does not take into account the fluid-structure interaction effects. The analysis reveals the importance of considering the fluid-structure interaction effects in designing the splitter plate in the TBCC exhaust system and demonstrates the availability of the present coupled CFD

关键词： fluid-structure interaction Loosely-coupled CFD/CSD method TBCC exhaust system Aeroelasticity Unsteady aerodynamics

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fluid-structure interaction simulations of cerebral arteries modeled by isotropic and anisotropic constitutive laws

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COMPUTATIONAL MECHANICS 2015年第3期55卷 479-498页

作者： Tricerri, Paolo Dede, Luca Deparis, Simone Quarteroni, Alfio Robertson, Anne M. Sequeira, Adelia Ecole Polytech Fed Lausanne CH-1015 Lausanne Switzerland Univ Lisbon Inst Super Tecn Dept Math P-1049001 Lisbon Portugal Univ Lisbon Inst Super Tecn CEMAT P-1049001 Lisbon Portugal Politecn Milan Dipartimento Matemat F Brioschi MOX Modeling & Sci Comp I-20133 Milan Italy Univ Pittsburgh Dept Bioengn Dept Mech Engn & Mat Sci Pittsburgh PA 15261 USA

This paper considers numerical simulations of fluid-structure interaction (FSI) problems in hemodynamics for idealized geometries of healthy cerebral arteries modeled by both nonlinear isotropic and anisotropic material constitutive laws. In particular, it focuses on an anisotropic model initially proposed for cerebral arteries to characterize the activation of collagen fibers at finite strains. In the current work, this constitutive model is implemented for the first time in the context of an FSI formulation. In this framework, we investigate the influence of the material model on the numerical results and, in the case of the anisotropic laws, the importance of the collagen fibers on the overall mechanical behavior of the tissue. With this aim, we compare our numerical results by analyzing fluid dynamic indicators, vessel wall displacement, Von Mises stress, and deformations of the collagen fibers. Specifically, for an anisotropic model with collagen fiber recruitment at finite strains, we highlight the progressive activation and deactivation processes of the fibrous component of the tissue throughout the wall thickness during the cardiac cycle. The inclusion of collagen recruitment is found to have a substantial impact on the intramural stress, which will in turn impact the biological response of the intramural cells. Hence, the methodology presented here will be particularly useful for studies of mechanobiological processes in the healthy and diseased vascular wall.

关键词： Material constitutive models Cerebral arterial tissue Hypereslatic isotropic laws Hyperelastic anisotropic laws fluid-structure interaction Numerical simulations

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Stabilisation and simulation of fluid-structure interaction models

Stabilisation and simulation of fluid-structure interaction ...

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作者： Moctar Ndiaye UNIVERSITE TOULOUSE 3 PAUL SABATIER (UT3 PAUL SABATIER)

学位级别：博士

The aim of this thesis is to study the stabilization of fluid-structure interaction models by finite dimensional controls acting at the boundary of the fluid domain. The fluid flow is described by the incompressible Navier-Stokes equations while the displacement of the structure, localized at the boundary of the fluid domain, satisfies a damped Euler-Bernoulli beam equation. First, we study the case where the control is a Dirichlet boundary condition in the fluid equations (control by suction/blowing). We obtain local feedback stabilization results around an unstable stationary solution of this system. Chapters 2 and 3 are devoted to the case where control is a force applied to the structure (control by boundary deformation). We consider, in chapter 2, a simplified model where the Euler-Bernoulli equation for the structure is replaced by a system of finite dimension. We construct feedback control laws for the infinite dimensional systems, or for their semi-discrete approximations, able to stabilize the linearized systems with a prescribed exponential decay rate, and locally the nonlinear systems. We present some numerical results showing the efficiency of the feedback laws.

关键词： fluid-structure interaction Navier-Stokes equations Euler-Bernoulli beam equation boundary control finite element numerical simulation

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fluid-structure interaction model of dynamic behavior of the discharge valve in a rotary compressor

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING 2015年第4期229卷 280-289页

作者： Tan, Qin Pan, Shu-lin Feng, Quan-ke Yu, Xiao-ling Wang, Zeng-li Xi An Jiao Tong Univ Sch Energy & Power Xian 710049 Peoples R China Guangxi Univ Sch Chem & Chem Engn Nanning 530004 Peoples R China

A three-dimensional fluid-structure interaction model is proposed for the discharge valve movement in a rotary compressor. The compression chamber pressure measured by the experiment confirmed that the fluid-structure interaction model is able to predict the valve dynamic behavior precisely. To demonstrate that the fact of the discharge port being covered partly by the cylinder and the roller cannot be ignored in the valve model, another fluid-structure interaction model in which the discharge port is not covered and the cylinder shape is simplified to be cylindrical is also specially presented. In this simplified fluid-structure interaction model, the flow energy loss through the discharge valve is 68.8% of that in the fluid-structure interaction model, and the impact velocity of the valve reed impacting on the retainer is 2.9m/s higher than that in the FSI model. It is found that the valve reed is obviously inclined because the discharge port is covered partly by the cylinder.

关键词： fluid-structure interaction discharge valve rotary compressor dynamic analysis valve reed

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fluid-structure interaction analysis of the left coronary artery with variable angulation

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COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING 2015年第14期18卷 1500-1508页

作者： Dong, Jingliang Sun, Zhonghua Inthavong, Kiao Tu, Jiyuan RMIT Univ PTRI Sch Aerosp Mech & Mfg Engn Bundoora Vic 3083 Australia Curtin Univ Dept Imaging & Appl Phys Discipline Med Imaging Perth WA 6845 Australia

The aim of this study is to elucidate the correlation between coronary artery branch angulation, local mechanical and haemodynamic forces at the vicinity of bifurcation. Using a coupled fluid-structure interaction (FSI) modelling approach, five idealized left coronary artery models with various angles ranging from 70 degrees to 110 degrees were developed to investigate the influence of branch angulations. In addition, one CT image-based model was reconstructed to further demonstrate the medical application potential of the proposed FSI coupling method. The results show that the angulation strongly alters its mechanical stress distribution, and the instantaneous wall shear stress distributions are substantially moderated by the arterial wall compliance. As high tensile stress is hypothesized to cause stenosis, the left circumflex side bifurcation shoulder is indicated to induce atherosclerotic changes with a high tendency for wide-angled models.

关键词： wall shear stress left coronary artery tensile stress arterial wall compliance branch angulation fluid-structure interaction

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