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SPH model for fluid-structure interaction and its application to debris flow impact estimation

LANDSLIDES 2017年第3期14卷 917-928页

作者： Dai, Zili Huang, Yu Cheng, Hualin Xu, Qiang Tongji Univ Dept Geotech Engn Coll Civil Engn Shanghai 200092 Peoples R China Tongji Univ Key Lab Geotech & Underground Engn Minist Educ Shanghai 200092 Peoples R China China Three Gorges Univ Hubei Key Lab Disaster Prevent & Reduct Yichang 443002 Peoples R China Chengdu Univ Technol State Key Lab Geohazard Prevent & Geoenvironm Pro Chengdu 610059 Peoples R China

On 13 August 2010, significant debris flows were triggered by intense rainfall events in Wenchuan earthquake-affected areas, destroying numerous houses, bridges, and traffic facilities. To investigate the impact force of debris flows, a fluid-structure coupled numerical model based on smoothed particle hydrodynamics is established in this work. The debris flow material is modeled as a viscous fluid, and the check dams are simulated as elastic solid (note that only the maximum impact forces are evaluated in this work). The governing equations of both phases are solved respectively, and their interaction is calculated. We validate the model with the simulation of a sand flow model test and confirm its ability to calculate the impact force. The Wenjia gully and Hongchun gully debris flows are simulated as the application of the coupled smoothed particle hydrodynamic model. The propagation of the debris flows is then predicted, and we obtain the evolution of the impact forces on the check dams.

关键词： Debris flow Impact force Smoothed particle hydrodynamics fluid-structure interaction

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NUMERICAL SIMULATIONS OF A 3D fluid-structure interaction MODEL FOR BLOOD FLOW IN AN ATHEROSCLEROTIC ARTERY

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MATHEMATICAL BIOSCIENCES AND ENGINEERING 2017年第1期14卷 179-193页

作者： Kafi, Oualid El Khatib, Nader Tiago, Jorge Sequeira, Adelia Univ Lisbon Dept Math IST Av Rovisco Pais P-1049001 Lisbon Portugal CEMAT Av Rovisco Pais P-1049001 Lisbon Portugal LAU Dept CS & Math P-36 Byblos Lebanon

The inflammatory process of atherosclerosis leads to the formation of an atheromatous plaque in the intima of the blood vessel. The plaque rupture may result from the interaction between the blood and the plaque. In each cardiac cycle, blood interacts with the vessel, considered as a compliant nonlinear hyperelastic. A three dimensional idealized fuid-structure interaction (FSI) model is constructed to perform the blood-plaque and blood-vessel wall interaction studies. An absorbing boundary condition (BC) is imposed directly on the outflow in order to cope with the spurious reflexions due to the truncation of the computational domain. The difference between the Newtonian and non-Newtonian effects is highlighted. It is shown that the von Mises and wall shear stresses are significantly affected according to the rigidity of the wall. The numerical results have shown that the risk of plaque rupture is higher in the case of a moving wall, while in the case of a fixed wall the risk of progression of the atheromatous plaque is higher.

关键词： Atherosclerosis blood flow non-Newtionian fluid fluid-structure interaction wall shear stress nonlinear hyperelastic structure

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Robust fluid-structure interaction analysis of an adaptive airfoil using shape memory alloy actuators

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SMART MATERIALS AND structureS 2018年第10期27卷 105035-105035页

作者： Machairas, Theodoros Kontogiannis, Alexandros Karakalas, Anargyros Solomou, Alexandros Riziotis, Vasilis Saravanos, Dimitris Univ Patras Dept Mech Engn & Aeronaut Patras Greece Polytech Montreal Dept Mech Engn Montreal PQ Canada Texas A&M Univ Dept Aerosp Engn College Stn TX 77843 USA Natl Tech Univ Athens Sch Mech Engn Athens Greece

In the present paper, an aero-structure interaction model for the rapid simulation of morphing structures realized through shape memory alloy (SMA) actuators is presented. The aerodynamic simulation method implements a potential flow method strongly coupled with an integral boundary layer method in the context of a viscous-inviscid interaction approach, which includes a transition prediction model and a simplified shear stress-transport equation for the turbulence closure. The structural analysis model of the airfoil integrates a well-established SMA constitutive model for the prediction of the actuator behavior into finite element software. The two numerical models are loosely interconnected by exchanging geometrical and loading data at each iteration. An articulated 2-link adaptive mechanism for load alleviation purposes in horizontal axis wind turbine blades is investigated considering two different morphing scenarios: (1) operation of a single hinged flap;(2) combined movement of two sequential airfoil segments is attempted to achieve a smoother camber variation. The present fluid-structure interaction (FSI) model is employed with the aim to quantify its effect and benefits on the active shape control of the morphing airfoil, the actuator response, and the aerodynamic performance including lift and drag coefficients. The presented results demonstrate the robustness and numerical performance of the developed FSI method.

关键词： fluid-structure interaction shape memory alloy actuator morphing airfoil wind turbines

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A novel modeling method to investigate the performance of aerostatic spindle considering the fluid-structure interaction

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TRIBOLOGY INTERNATIONAL 2017年 115卷 461-469页

作者： Gao, Qiang Lu, Lihua Chen, Wanqun Chen, Guoda Wang, Guanglin Harbin Inst Technol Sch Mechatron Engn Harbin Heilongjiang Peoples R China Zhejiang Univ Technol Minist Educ & Zhejiang Prov Key Lab E&M Hangzhou Zhejiang Peoples R China

The performances of aerostatic spindle are highly affected by the fluid-structure interaction (FSI) between air film and solid structure. This paper proposes a novel modeling method to investigate the FSI of aerostatic spindle system, by which the structure deformation included by air film force can be acquired. Furthermore, a virtual weight loading method is proposed to estimate the stiffness of spindle with consideration of structure deformation and gravitational eccentricity. The reliability of the proposed method is verified by experiments. Based on the proposed FSI model, the influences of air film geometrical parameters and structure dimension on the performance of aerostatic spindle are further investigated and discussed to guide the design of air spindle.

关键词： fluid-structure interaction Aerostatic spindle Air bearing Air spindle analysis

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Efficient optimization procedure in non-linear fluid-structure interaction problem: Application to mainsail trimming in upwind conditions

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JOURNAL OF fluidS AND structureS 2017年 69卷 209-231页

作者： Sacher, Matthieu Hauville, Frederic Duvigneau, Regis Le Maitre, Olivier Aubin, Nicolas Durand, Mathieu Naval Acad Res Inst IRENAV CC600 F-29240 Brest 9 France INRIA Sophia Antipolis 2004 Route Lucioles F-06902 Valbonne France CNRS LIMSI Rue John Von Neumann F-91400 Orsay France K EPSILON 1300 Route Cretes F-06560 Valbonne France

This paper investigates the use of Gaussian processes to solve sail trimming optimization problems. The Gaussian process, used to model the dependence of the performance with the trimming parameters, is constructed from a limited number of performance estimations at carefully selected trimming points, potentially enabling the optimization of complex sail systems with multiple trimming parameters. The proposed approach is tested on a two-parameter trimming for a scaled IMOCA mainsail in upwind sailing conditions. We focus on the robustness of the proposed approach and study especially the sensitivity of the results to noise and model error in the point estimations of the performance. In particular, we contrast the optimization performed on a real physical model set in a wind tunnel with a fully non-linear numerical fluid-structure interaction model of the same experiments. For this problem with a limited number of trimming parameters, the numerical optimization was affordable and found to require a comparable amount of performance estimation as for the experimental case. The results reveal a satisfactory agreement for the numerical and experimental optimal trimming parameters, considering the inherent sources of errors and uncertainties in both numerical and experimental approaches. Sensitivity analyses have been eventually performed in the numerical optimization problem to determine the dominant source of uncertainties and characterize the robustness of the optima.

关键词： Sail trimming optimization fluid-structure interaction Gaussian process model Experimental Numerical Uncertainty quantification

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Simplified calculation method for transverse seismic response of aqueducts considering fluid-structure interaction

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JOURNAL OF VIBROENGINEERING 2017年第8期19卷 6135-6151页

作者： Chen, Ying Huang, Jian Zhang, Wenxue Li, Yunkai Beijing Univ Technol Coll Architecture & Civil Engn Minist Educ Key Lab Urban Secur & Disaster Engn Beijing Peoples R China

Aqueduct is the key structure in water conveyance engineering, which may be damaged during earthquake. Although numerous water conveyance designs have been built, the current state of researches on aqueduct aseismic design is inadequate. In this paper, based on the fluid-structure interaction dynamics and response spectra analysis, a simplified analysis method was proposed to evaluate the transverse seismic response of aqueducts, and the simplified calculating results were compared with the results of the nonlinear finite element calculation of fluid-structure interaction and experimental results. The results showed that the simplified analysis method put forward in this paper could be used to evaluate the transverse seismic response of aqueducts. In the condition that the pier height is less than 40 m, the first-order lateral vibration mode of the aqueduct has a higher model contribution rate;the simplified calculation method can achieve extremely high accuracy. The simplified calculation precision decreases as the height increases when the pier height exceeds 40 m.

关键词： aqueduct aseismic design fluid-structure interaction response spectra model contribution rate

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Composite bottom panel slamming of a fast planing hull via tightly coupled fluid-structure interaction simulations and sea trials

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OCEAN ENGINEERING 2017年 143卷 240-258页

作者： Volpi, S. Diez, M. Sadat-Hosseini, H. Kim, D. -H. Stern, F. Thodal, R. S. Grenestedt, J. L. Univ Iowa IIHR Hydrosci & Engn Iowa City IA 52242 USA CNR Marine Technol Res Inst CNR INSEAN Rome Italy Lehigh Univ Dept Mech Engn & Mech Bethlehem PA 18015 USA

The paper presents partitioned tightly coupled fluid-structure interaction (FSI) simulations for composite panel slamming of a high-speed planing hull, including comparison with full-scale experiments. Panels with different layout/stiffness are investigated. Computational fluid dynamics (CFD) is performed using the URANS code CFDShip-Iowa. Computational structural dynamics (CSD) uses modal expansion by ANSYS finite elements. One-and two-way tightly coupled FSI is performed. The complexity of sea-trial conditions is reduced by statistical/frequency analysis, allowing for a simplified representation by one regular wave. Simulations provide details of slamming, including correlation of re-entering pressure peaks with motions and strain peaks. Numerical/modeling issues are discussed. Expected value and associated uncertainty of experimental pressure/ strain peak and duration are used for validation. The difference of panels' dynamics is well predicted. Validation errors and uncertainties (average 25% and 14%) are quite large. Nevertheless, errors always fall within one standard deviation of experimental-data individual readings. Results are promising especially if compared to earlier slamming studies for regular/irregular waves in controlled towing tank tests, which show average error and validation uncertainty of 25% and 10%. The current study lays the groundwork for research on high-fidelity CFD/CSD FSI of real-world geometry slamming and ultimately multidisciplinary design optimization of structural and hull-form parameters.

关键词： fluid-structure interaction High-speed planing hulls Composite material Slamming Simulations Sea trials

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A PARALLEL ALGORITHM FOR THE SOLUTION OF LARGE-SCALE NONCONFORMING fluid-structure interaction PROBLEMS IN HEMODYNAMICS

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Journal of Computational Mathematics 2017年第3期35卷 363-380页

作者： Davide Forti Alfio Ouarteroni Simone DeDaris MATH-CMCS Ecole Polytechnique Federale de Lausanne Station 8 CH-1015 Lausanne Switzerland

In this work we address the numerical solution of large scale fluid-structure interaction problems when nonconforming grids and/or nonconforming finite elements discretizations are used at the interface separating the fluid and structure physical domains. To deal with nonconforming fluid-structure discretizations we use the INTERNODES method （INTER- polation for NOnconforming DEcompositionS） formerly introduced in [6] for the solution of elliptic PDEs on nonconforming domain decomposition. To cope with the high com- putational complexity of the three dimensional FSI problem obtained after spatial and temporal discretization, we use the block parallel preconditioner FaCSI [7]. A numerical investigation of the accuracy properties of INTERNODES applied to the nonconforming FSI problem is carried out for the simulation of the pressure wave propagation in a straight elastic cylinder. Finally, we study the scalability performance of the FaCSI precondition- er in the nonconforming case by solving a large-scale nonconforming FSI problem in a patient-specific arterial bypass.

关键词： fluid-structure interaction Domain decomposition Nonconforming discretizations INTERNODES Biomechanics Parallel preconditioners High performance comput-ing.

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Constrained moving least-squares immersed boundary method for fluid-structure interaction analysis

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN fluidS 2017年第12期85卷 675-692页

作者： Qu, Yegao Batra, Romesh C. Virginia Polytech Inst & State Univ Dept Biomed Engn & Mech M-C 0219 Blacksburg VA 24061 USA Shanghai Jiao Tong Univ State Key Lab Mech Syst & Vibrat Shanghai 200240 Peoples R China

A numerical method is presented for the analysis of interactions of inviscid and compressible flows with arbitrarily shaped stationary or moving rigid solids. The fluid equations are solved on a fixed rectangular Cartesian grid by using a higher-order finite difference method based on the fifth-order WENO scheme. A constrained moving least-squares sharp interface method is proposed to enforce the Neumann-type boundary conditions on the fluid-solid interface by using a penalty term, while the Dirichlet boundary conditions are directly enforced. The solution of the fluid flow and the solid motion equations is advanced in time by staggerly using, respectively, the third-order Runge-Kutta and the implicit Newmark integration schemes. The stability and the robustness of the proposed method have been demonstrated by analyzing 5 challenging problems. For these problems, the numerical results have been found to agree well with their analytical and numerical solutions available in the literature. Effects of the support domain size and values assigned to the penalty parameter on the stability and the accuracy of the present method are also discussed.

关键词： compressible flow constrained moving least-squares interpolation fluid-structure interaction immersed boundary method shock

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An efficient fluid-structure interaction model for optimizing twistable flapping wings

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JOURNAL OF fluidS AND structureS 2017年 73卷 82-99页

作者： Wang, Q. Goosen, J. F. L. van Keulen, F. Delft Univ Technol Dept Precis & Microsyst Engn Struct Optimizat & Mech Sect Mekelweg 2 NL-2628 CD Delft Netherlands

Spanwise twist can dominate the deformation of flapping wings and alters the aerodynamic performance and power efficiency of flapping wings by changing the local angle of attack. Traditional fluid-structure interaction (FSI) models, based on Computational Structural Dynamics (CSD) and Computational fluid Dynamics (CFD), have been used to investigate the influence of twist on the power efficiency. However, it is impractical to use them for twist optimization due to the high computational cost. On the other hand, it is of great interest to study the optimal twist of flapping wings. In this work, we propose a computationally efficient FSI model based on an analytical twist model and a quasi steady aerodynamic model which replace the expensive CSD and CFD methods. The twist model uses a polynomial to describe the change of the twist angle along the span. The polynomial order is determined based on a convergence study. A nonlinear plate model is used to evaluate the structural response of the twisted wing. The adopted quasi-steady aerodynamic model analytically calculates the aerodynamic loads by including four loading terms which originate from the wing's translation, rotation, their coupling and the added mass effect. Based on the proposed FSI model, we optimize the twist of a rectangular wing by minimizing the power consumption during hovering flight. The power efficiency of optimized twistable and rigid wings is studied. Comparisons indicate that the optimized twistable wings exhibit power efficiencies close to the optimized rigid wings, unless the pitching amplitude at the wing root is limited. When the pitching amplitude at the root decreases by increasing the root stiffness, the optimized rigid wings need more power for hovering. However, with the help of wing twist, the power efficiencies of optimized twistable wings with a prescribed root stiffness are comparable with the twistable wings with an optimal root stiffness. This observation provides an explanation fo

关键词： Twistable flapping wing fluid-structure interaction Hovering flight Power efficiency Optimization

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