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Gust response alleviation via wingtip bending freely with fluid-structure interaction approach based on dynamic modal rotation method 认领 引用
1
作者 Yang ZHENG Yuting DAI +1 位作者 Guangjing HUANG Yating HU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第5期382-397,共16页
This paper presents a flexible wingtip bending freely for alleviating large amplitude gust loads at low Reynolds numbers.The Modal Rotation Method(MRM)is extended to a form capable of solving nonlinear structural dyna... This paper presents a flexible wingtip bending freely for alleviating large amplitude gust loads at low Reynolds numbers.The Modal Rotation Method(MRM)is extended to a form capable of solving nonlinear structural dynamics by time discretization and iterative solving.By integrating the dynamic MRM with Computational Fluid Dynamics(CFD),this paper presents a parallelized Fluid-Structure Interaction(FSI)approach to depict the large gust encounter of the wingtip's freely bending.The numerical results of the proposed method are in great agreement with experimental data,while achieving a 63%reduction in computation time compared to a direct CFD/CSD coupling approach.The effects of bending stiffness and mass ratio of the wingtip on gust response under 1-cos gust conditions are investigated.The results show that the gust-induced lift decreases by over 15%when mass ratio is reduced to 0.027 and stiffness ratio is reduced to 0.004 under Gust Ratios(GR)of 0.5 and 1.The velocity generated by the wingtip is essential to alleviate gust.The flow field results show that under large amplitude gust conditions,the wingtip bending freely reduces the intensity of the leading-edge vortex,thus alleviating the wing's lift.In addition,it is verified that the wingtip bending freely reduces lift by over 10%for sinusoidal gusts in the frequency range of 2–7 Hz at GR of 0.5.The phase of wingtip bending is a key parameter in sinusoidal gust alleviation,with better alleviation effects observed when it is close to π/2. 展开更多
关键词 Fluid-structure interaction Gust load alleviation Nonlinear dynamics Unsteady flow Wingtip morphing
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Fluid-structure interaction of left ventricle with impaired ventricular contractility 认领 引用
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作者 Yihan Wang Yumeng Cai +7 位作者 Meng Pang Yongyan Xu Ghassan S.Kassab Cong Zhou J.Geoffrey Chase Xiaoqi Chen Haoxiang Luo Ye Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第7期297-314,共18页
Although reduced ejection fraction(EF,normal range:50%-70%)is a hallmark of systolic heart failure,the patho-genesis underlying impaired systolic function remains unclear,and the hemodynamics may play an important rol... Although reduced ejection fraction(EF,normal range:50%-70%)is a hallmark of systolic heart failure,the patho-genesis underlying impaired systolic function remains unclear,and the hemodynamics may play an important role in the process.Here,we present a two-way coupled three-dimensional fluid-structure interaction(FSI)study to compare hemodynamic and biomechanical behavior in a left heart(LH)model with two pathological EF values:severely impaired(24%)and moderately impaired(40%).FSI of the mitral valve(MV)and the aortic valve(AV)has been included.The hemodynamic outputs,detailed flow field,valvular dynamics,and the energy balance are discussed.The results show coordinated opening and closing of the valves and corresponding pressure rise and fall in the ventricle.Comparison of the two EF cases reveals that EF=40%improves the performance of the MV,achieving a significantly higher inflow velocity and a larger geometric orifice area(GOA)while maintaining the GOA of the AV.Both cases show a competent closure of the AV with negligible regurgitation.The opening of the diastolic MV initiates a bifurcated jet that transitions to a central high-speed stream,generating left ventricle(LV)vortices that mitigate the risk of stasis,a mechanism that is attenuated at EF=24%.Energy analysis shows EF=40%requires a greater input of LV work,coupled with an elevated power and kinetic energy flux at the aortic outlet,and dissipation within LH.These findings may help elucidate the EF-dependent hemodynamic coupling underlying pathological and compensatory cardiac func-tions and may provide a framework for future study of a pathological feedback loop linking valvular function,ventricular filling,and cardiac output. 展开更多
关键词 Cardiovascular flow Aortic valve mitral valve Fluid-structure interaction Immersed boundary method Vortex dynamics
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Fully coupled fluid-structure interaction of diaphragm rupture in high-pressure-ratio shock tunnels 认领 引用
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作者 Zhe XU Hong CHEN +1 位作者 Conglin LIU Junmou SHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期341-355,共15页
Shock tunnels are indispensable facilities for hypersonic aerodynamic experimentation.Within these systems,the diaphragm plays a pivotal role,as its rupture process critically influences shock wave generation quality,... Shock tunnels are indispensable facilities for hypersonic aerodynamic experimentation.Within these systems,the diaphragm plays a pivotal role,as its rupture process critically influences shock wave generation quality,experimental repeatability,and facility reliability.A thorough understanding of diaphragm rupture dynamics is therefore essential for optimizing shock tunnel design,improving experimental accuracy,and ensuring operational safety.To address the complex challenge of fully coupled multiphysics analysis in high-pressure-ratio shock tunnels,this study introduces a high-fidelity,three-dimensional,fully coupled Fluid-Structure Interaction(FSI)simulation framework.This framework seamlessly integrates the Dual Conservation Element and Solution Element(Dual-CESE)method,the Immersed Boundary Method(IBM),and the JohnsonCook(J-C)material constitutive and failure model.The combined approach enables synchronized simulation and analysis of the entire diaphragm rupture sequence—including pre-deformation,crack initiation and propagation,and fully developed petaling deformation—alongside the formation and evolution of the associated supersonic flow field.The simulation results show strong agreement with experimental observations,with the post-rupture geometric morphology accurately replicated and a shock wave velocity deviation of only 2.55%from experimental measurements.The study uncovers the dynamic failure mechanisms,revealing that nonlinear pressure loading initiates cracking within the diaphragm.It further elucidates how the nonlinearly coupled interactions between petaling dynamics and fracture morphology directly impact shock wave formation and evolution.This computational framework provides a novel and robust methodology for advancing shock tunnel design and conducting comprehensive reliability assessments. 展开更多
关键词 Diaphragm Diaphragm rupture Fully coupled fluid-structure interaction Nonlinear coupling Shock tunnel
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Hydrodynamic Mechanisms,Fluid-Structure Interaction,and Material Selection in Underwater Bio-Inspired Robots:A Review 认领 引用
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作者 Hao Jiang Lucheng Sun +1 位作者 Liguo Shuai Zhihan Li 《Fluid Dynamics & Materials Processing》 EI 2026年第6期48-85,共38页
Underwater bio-inspired robots have emerged as a promising alternative to conventional propellerdriven autonomous underwater vehicles and remotely operated vehicles because of their potential for high propulsive effic... Underwater bio-inspired robots have emerged as a promising alternative to conventional propellerdriven autonomous underwater vehicles and remotely operated vehicles because of their potential for high propulsive efficiency,superior maneuverability,reduced acoustic signatures,and enhanced environmental adaptability.Unlike rigid propellers operating under approximately steady inflow conditions,bio-inspired propulsion relies on strongly unsteady hydrodynamic mechanisms,including vortex generation and shedding,added-mass effects,boundary-layer evolution,and flexible fluid-structure interaction(FSI).These processes fundamentally govern thrust production,energy conversion,and maneuvering performance,yet a systematic synthesis connecting hydrodynamic mechanisms with engineering implementation remains limited.This review addresses that gap from a hydrodynamic perspective.First,the major propulsion modes of aquatic organisms,including body and caudal fin(BCF),median and paired fin(MPF),and jet propulsion,are summarized together with their characteristic wake structures.Key unsteady flow mechanisms are then discussed,including reverse Kármán vortex streets,leading-edge vortex dynamics,dynamic stall,boundary-layer behavior,wake instabilities,and biomimetic drag-reduction strategies.Particular attention is given to flexible FSI,including modeling frameworks,passive deformation-active actuation coupling,stiffness and morphology effects,and energy-transfer pathways.Representative studies report propulsive efficiencies of approximately 50-70%for optimized flexible flapping foils and above 70%for phase-tuned dual-foil systems,while biomimetic surface designs have achieved approximately 5-10%drag reduction under specific flow conditions.However,these gains remain strongly condition-dependent,and their practical transfer is still limited by scale effects,propulsor interference,model uncertainty,material degradation,biofouling and insufficient marine validation.Future directions are proposed in real-environment hydrodynamics,multi-robot flow coordination,interdisciplinary modeling,and advanced materials.This review provides a mechanism-to-design framework for understanding,designing,and optimizing next-generation underwater bio-inspired robots. 展开更多
关键词 Bio-inspired underwater robots unsteady hydrodynamics fluid-structure interaction flexible propulsion biomimetic materials
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A survey of panel aeroelasticity in shock-dominated flow:Perspectives from fluid-structure interactions and shock wave-boundary layer interactions 认领 引用 被引量：1
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作者 Aiming SHI Yiwen HE 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期210-229,共20页
As a multidisciplinary phenomenon,panel aeroelasticity in shock-dominated flow is featured by two primary interactions:Fluid-Structure Interactions(FSIs)and Shock-Boundary Layer Interactions(SBLIs).The former raises s... As a multidisciplinary phenomenon,panel aeroelasticity in shock-dominated flow is featured by two primary interactions:Fluid-Structure Interactions(FSIs)and Shock-Boundary Layer Interactions(SBLIs).The former raises structural concerns,and the latter is of aerodynamic interest.Thus,panel aeroelasticity in shock-dominated flow represents a vital topic for the development and optimization of supersonic vehicles and propulsion systems.This review systematically summarizes recent advances in the methodologies applied to capture structural and fluid dynamics,including theoretical models,numerical simulations,and wind tunnel experiments.The application of data-driven modal decomposition,an advanced technique to extract physically crucial features,on the topic is introduced.From the perspective of FSIs,the distinctive aeroelastic behaviors in shock-dominated flow,including hysteresis phenomena and nonlinear responses,are highlighted.From the perspective of SBLIs,the modifications in their spatial and temporal characteristics imposed by the aeroelastic responses are emphasized.Motivated by the interaction between the shock waves and structural response,different strategies have been proposed to implement aeroelastic suppression and shock control,which have the potential to enhance structural safety and aerodynamic performance in the next generation of high-speed flight vehicles. 展开更多
关键词 Aeroelasticity Fluid structure interaction Modal decomposition Shock boundary layer interactions Shock waves
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Nonlinear flow control mechanism of two flexible flaps with fluid-structure interaction 认领 引用
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作者 Jiakun Han Chao Dong +1 位作者 Jian Zhang Gang Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第2期116-131,共16页
The flow control at low Reynolds numbers is one of the most promising technologies in the field of aerodynamics,and it is also an important source of the innovation for novel aircraft.In this study,a new way of nonlin... The flow control at low Reynolds numbers is one of the most promising technologies in the field of aerodynamics,and it is also an important source of the innovation for novel aircraft.In this study,a new way of nonlinear flow control by interaction between two flexible flaps is proposed,and their flow control mechanism is studied employing the self-constructed immersed boundary-lattice Boltzmann-finite element method(IB-LB-FEM).The effects of the difference in material properties and flap length between the two flexible flaps on the nonlinear flow control of the airfoil are discussed.It is suggested that the relationship between the deformation of the two flexible flaps and the evolution of the vortex under the fluid-structure interaction(FSI).It is shown that the upstream flexible flap plays a key role in the flow control of the two flexible flaps.The FSI effect of the upstream flexible flap will change the unsteady flow behind it and affect the deformation of the downstream flexible flap.Two flexible flaps with different material properties and different lengths will change their own FSI characteristics by the induced vortex,effectively suppressing the flow separation on the airfoil’s upper surface.The interaction of two flexible flaps plays an extremely important role in improving the autonomy and adjustability of flow control.The numerical results will provide a theoretical basis and technical guidance for the development and application of a new flap passive control technology. 展开更多
关键词 Nonlinear flow control Flexible flap Fluid-structure interaction Flow separation IB-LB-FEM
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A parallel solver framework for fully implicit monolithic fluid-structure interaction 认领 引用 被引量：2
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作者 Yujie Sun Qingshuang Lu Ju Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第2期88-115,共28页
We propose a suite of strategies for the parallel solution of fully implicit monolithic fluid-structure interaction(FSI).The solver is based on a modeling approach that uses the velocity and pressure as the primitive ... We propose a suite of strategies for the parallel solution of fully implicit monolithic fluid-structure interaction(FSI).The solver is based on a modeling approach that uses the velocity and pressure as the primitive variables,which offers a bridge between computational fluid dynamics(CFD)and computational structural dynamics.The spatiotemporal discretization leverages the variational multiscale formulation and the generalized-αmethod as a means of providing a robust discrete scheme.In particular,the time integration scheme does not suffer from the overshoot phenomenon and optimally dissipates high-frequency spurious modes in both subproblems of FSI.Based on the chosen fully implicit scheme,we systematically develop a combined suite of nonlinear and linear solver strategies.Invoking a block factorization of the Jacobian matrix,the Newton-Raphson procedure is reduced to solving two smaller linear systems in the multi-corrector stage.The first is of the elliptic type,indicating that the algebraic multigrid method serves as a well-suited option.The second exhibits a two-by-two block structure that is analogous to the system arising in CFD.Inspired by prior studies,the additive Schwarz domain decomposition method and the block-factorization-based preconditioners are invoked to address the linear problem.Since the number of unknowns matches in both subdomains,it is straightforward to balance loads when parallelizing the algorithm for distributed-memory architectures.We use two representative FSI benchmarks to demonstrate the robustness,efficiency,and scalability of the overall FSI solver framework.In particular,it is found that the developed FSI solver is comparable to the CFD solver in several aspects,including fixed-size and isogranular scalability as well as robustness. 展开更多
关键词 Fluid-structure interaction Monolithic coupling Implicit time integration Iterative methods Vortex-induced vibration
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Computational Fluid-Structure Interaction Design Approach for Polymer Micromachined Insect-mimetic Flapping Wings of Air Vehicles 认领 引用
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作者 Vinay Shankar Kaede Sugikawa +3 位作者 Nagi Shirakawa Ryusei Nishinohara Kimura Masaaki Daisuke Ishihara 《Journal of Bionic Engineering》 SCIE EI CSCD 2025年第6期2900-2922,共23页
This paper proposes 2.5-dimensional polymer micromachined insect-mimetic wings based on a fluid-structure interaction(FSI)design concept that enables natural deformations like cambering and pitching under fluid forces... This paper proposes 2.5-dimensional polymer micromachined insect-mimetic wings based on a fluid-structure interaction(FSI)design concept that enables natural deformations like cambering and pitching under fluid forces.Instead of directly employing an analysis for the FSI,an iterative structural Design Window(DW)search is used to reduce the computational cost significantly.A DW search using the iterative method refines the initial design by addressing fabrication challenges and tuning it to meet manufacturability constraints.The successful fabrication and demonstration of the final design solution for a wing demonstrates the effectiveness of the iterative DW search based on the FSI design concept.Furthermore,a pixel model is introduced to convert an unstructured to a structured mesh for the FSI analysis to further reduce the computational cost.The camber and pitching error between the unstructured and structured meshes is minimized to achieve insect-like aerodynamic performance by adjusting the elastic moduli of center and root veins.Finally,an analysis for the FSI is conducted,based on the parameters obtained from the pixel model to evaluate the flight performance on the basis of the lift,camber,and pitching required by an actual insect to maneuver and hover. 展开更多
关键词 Insect-mimetic wing 2.5-dimension(2.5-D) Fluid-structure interaction(FSI)design Design window(DW)search Pixel model Polymer micromachining
Computational study on the fluid-structure interaction between explosion-induced bubbles and submarine pipes 认领 引用
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作者 Lei Gao Junjie Zhao +2 位作者 Maoyu Qi Wentao Ma Shunxiang Cao 《Theoretical & Applied Mechanics Letters》 EI CAS CSCD 2025年第6期618-629,共12页
Submarine pipelines are critical infrastructures for offshore energy transport and communications. Understanding their structural response to near-field explosions is crucial for enhancing their blast resistance and o... Submarine pipelines are critical infrastructures for offshore energy transport and communications. Understanding their structural response to near-field explosions is crucial for enhancing their blast resistance and operational safety. This study presents a computational study on the interaction between explosion-induced bubbles and a seabed-mounted pipeline. A recently developed computational framework is employed, which couples a compressible fluid solver with a finite element structural solver via a partitioned procedure. An embedded boundary method and a level-set method are employed to handle the fluid-structure and gas-liquid interfaces. Using this framework, we analyze the flow field evolution, bubble dynamics, and transient pipe deformation. Two distinct response modes are identified: periodic oscillation under low-pressure loading and downward collapse triggered by high-pressure loading and bubble jet impact. Specifically, under high-pressure conditions, the pipe initially deforms inward, generating a localized high-pressure zone within the concave region. During structural rebound, the trapped fluid is expelled upward, giving rise to a bubble jet. Further parametric studies on the pipe's internal pressure, wall thickness, and support angle reveal several key insights. A higher internal pressure delays structural collapse, and a greater pipe thickness results in more uniform implosion morphologies. The support angle strongly influences the collapse dynamics, with the shortest collapse time occurring at 60 °. These findings offer new insights for the protective design of submarine pipelines. 展开更多
关键词 Fluid-structure interaction Underwater explosion Submarine pipeline Bubble dynamics
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Changes in shale microstructure and fluid flow under high temperature:Experimental analysis and fluid-structure interaction simulation 认领 引用 被引量：1
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作者 Xiang-Ru Chen Xin Tang +4 位作者 Rui-Gang Zhang Heng Yang Qiu-Qi Chen Zhang-Ping Yan Lei Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2025年第4期1699-1711,共13页
Oil shale is characterized by a dense structure,low proportion of pores and fissures,and low permeability.Pore-fracture systems serve as crucial channels for shale oil migration,directly influencing the production eff... Oil shale is characterized by a dense structure,low proportion of pores and fissures,and low permeability.Pore-fracture systems serve as crucial channels for shale oil migration,directly influencing the production efficiency of shale oil resources.Effectively stimulating oil shale reservoirs remains a challenging and active research topic.This investigation employed shale specimens obtained from the Longmaxi Formation.Scanning electron microscopy,fluid injection experiments,and fluid-structure interaction simulations were used to comprehensively analyze structural changes and fluid flow behavior under high temperatures from microscopic to macroscopic scales.Experimental results indicate that the temperature has little effect on the structure and permeability of shale before 300℃.However,there are two threshold temperatures within the range of 300 to 600℃that have significant effects on the structure and permeability of oil shale.The first threshold temperature is between 300 and 400℃,which causes the oil shale porosity,pore-fracture ratio,and permeability begin to increase.This is manifested by the decrease in micropores and mesopores,the increase in macropores,and the formation of a large number of isolated pores and fissures within the shale.The permeability increases but not significantly.The second threshold temperature is between 500 and 600℃,which increases the permeability of oil shale significantly.During this stage,micropores and mesopores are further reduced,and macropores are significantly enlarged.A large number of connected and penetrated pores and fissures are formed.More numerous and thicker streamlines appear inside the oil shale.The experimental results demonstrate that high temperatures significantly alter the microstructure and permeability of oil shale.At the same time,the experimental results can provide a reference for the research of in-situ heating techniques in oil shale reservoir transformation. 展开更多
关键词 High temperature treatment Oil shale Longmaxi Formation Fluidestructure interaction Fluid simulation
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Topology optimization for fluid-structure interaction problems considering heat transfer performance 认领 引用
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作者 Yuhui Jing Li An +4 位作者 Sinan Yi Jing Li Pai Liu Yaguang Wang Xiaopeng Zhang 《Theoretical & Applied Mechanics Letters》 EI CAS CSCD 2025年第4期351-364,共14页
Effectively controlling the deformation and temperature of heated structures is crucial for achieving highperformance active cooling through fluid flow.In this study,the topology optimization design of structures cons... Effectively controlling the deformation and temperature of heated structures is crucial for achieving highperformance active cooling through fluid flow.In this study,the topology optimization design of structures considering fluid–structure interactions and heat transfer performance was investigated,and then optimized designs of two-dimensionalhree-dimensional cooling impingement systems obtained using the proposed method were obtained.In the optimization model,the objective function was constructed as a weighted combination of the mechanical deformations at specific locations and the average temperature within the designated solid channel structures.Additionally,explicit functional interpolation models were introduced to establish connections between the thermal,fluid,and solid properties,along with the element densities.In the analysis model,the strongly coupled structural mechanical deformation and fluid velocity field were analyzed via a dynamicgrid-based finite element model with a Winslow elliptic smoother to automatically track the fluid–structure interface during the process of optimization.To solve the optimization problems,the globally convergent moving asymptotic optimizer method was used to adjust the design variables on the basis of the sensitivity analysis.A demonstration of the efficacy of the proposed algorithm is provided through the presentation of several optimization examples.Furthermore,two-and three-dimensional cooling impingement systems were designed with the proposed method. 展开更多
关键词 Topology optimization Conjugate heat transfer Cooling impingement system design Fluid–structure interaction
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Improved frequency modeling and solution for parallel liquid-filled pipes considering both fluid-structure interaction and structural coupling 认领 引用 被引量：10
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作者 Xumin GUO Chunliang XIAO +3 位作者 Hui MA Hui LI Xufang ZHANG Bangchun WEN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2022年第8期1269-1288,共20页
The dynamic characteristics of a single liquid-filled pipe have been broadly studied in the previous literature.The parallel liquid-filled pipe(PLFP)system is also widely used in engineering,and its structure is more ... The dynamic characteristics of a single liquid-filled pipe have been broadly studied in the previous literature.The parallel liquid-filled pipe(PLFP)system is also widely used in engineering,and its structure is more complex than that of a single pipe.However,there are few reports about the dynamic characteristics of the PLFPs.Therefore,this paper proposes improved frequency modeling and solution for the PLFPs,involving the logical alignment principle and coupled matrix processing.The established model incorporates both the fluid-structure interaction(FSI)and the structural coupling of the PLFPs.The validity of the established model is verified by modal experiments.The effects of some unique parameters on the dynamic characteristics of the PLFPs are discussed.This work provides a feasible method for solving the FSI of multiple pipes in parallel and potential theoretical guidance for the dynamic analysis of the PLFPs in engineering. 展开更多
关键词 parallel liquid-filled pipe(PLFP) dynamic analysis improved frequency modeling and solution fluid-structure interaction(FSI) structure coupling
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Numerical simulation of soft palate movement and airflow in human upper airway by fluid-structure interaction method 认领 引用 被引量：10
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作者 Xiuzhen Sun Chi Yu +1 位作者 Yuefang Wang Yingxi Liu 《Acta Mechanica Sinica》 SCIE EI CAS 2007年第4期359-367,共9页
In this paper,the authors present airflow field characteristics of human upper airway and soft palate movement attitude during breathing.On the basis of the data taken from the spiral computerized tomography images of... In this paper,the authors present airflow field characteristics of human upper airway and soft palate movement attitude during breathing.On the basis of the data taken from the spiral computerized tomography images of a healthy person and a patient with Obstructive Sleep Apnea-Hypopnea Syndrome(OSAHS),three-dimensional models of upper airway cavity and soft palate are reconstructed by the method of surface rendering.Numerical simulation is performed for airflow in the upper airway and displacement of soft palate by fluid-structure interaction analysis.The reconstructed threedimensional models precisely preserve the original configuration of upper airways and soft palate.The results of the pressure and velocity distributions in the airflow field are quantitatively determined,and the displacement of soft palate is presented.Pressure gradients of airway are lower for the healthy person and the airflow distribution is quite uniform in the case of free breathing.However,the OSAHS patient remarkably escalates both the pressure and velocity in the upper airway,and causes higher displacement of the soft palate.The present study is useful in revealing pathogenesis and quantitative mutual relationship between configuration and function of the upper airway as well as in diagnosingdiseases related to anatomical structure and function of the upper airway. 展开更多
关键词 Obstructive sleep apnea-hypopnea syndrome Upper airway Soft palate Three-dimensional finiteelement reconstruction Fluid-structure interaction Numerical simulation
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An improved algorithm for fluid-structure interaction of high-speed trains under crosswind 认领 引用 被引量：35
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作者 Tian LI Jiye ZHANG Weihua ZHANG 《Journal of Modern Transportation》 2011年第2期75-81,共7页
Based on the train-track coupling dynamics and high-speed train aerodynamics,this paper deals with an improved algorithm for fluid-structure interaction of high-speed trains.In the algorithm,the data communication bet... Based on the train-track coupling dynamics and high-speed train aerodynamics,this paper deals with an improved algorithm for fluid-structure interaction of high-speed trains.In the algorithm,the data communication between fluid solver and structure solver is avoided by inserting the program of train-track coupling dynamics into fluid dynamics program,and the relaxation factor concerning the load boundary of the fluid-structure interface is introduced to improve the fluctuation and convergence of aerodynamic forces.With this method,the fluid-structure dynamics of a highspeed train are simulated under the condition that the velocity of crosswind is 13.8 m/s and the train speed is 350 km/h.When the relaxation factor equals 0.5,the fluctuation of aerodynamic forces is lower and its convergence is faster than in other cases.The side force and lateral displacement of the head train are compared between off-line simulation and co-simulation.Simulation results show that the fluid-structure interaction has a significant influence on the aerodynam-ics and attitude of the head train under crosswind conditions.In addition,the security indexes of the head train worsen after the fluid-structure interaction calculation.Therefore,the fluid-structure interaction calculation is necessary for high-speed trains. 展开更多
关键词 high-speed train fluid-structure interaction crosswind aerodynamics relaxation factor
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Hybrid algorithm for modeling of fluid-structure interaction in incompressible,viscous flows 认领 引用 被引量：6
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作者 Yin Lu Young Eun Jung Chae Deniz Tolga Akcabay 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第4期1030-1041,共12页
The objective of this paper is to present and to validate a new hybrid coupling(HC)algorithm for modeling of fluid-structure interaction(FSI)in incompressible,viscous flows.The HC algorithm is able to avoid numerical ... The objective of this paper is to present and to validate a new hybrid coupling(HC)algorithm for modeling of fluid-structure interaction(FSI)in incompressible,viscous flows.The HC algorithm is able to avoid numerical instability issues associated with artificial added mass effects,which are often encountered by standard loosely coupled(LC)and tightly coupled(TC)algorithms,when modeling the FSI response of flexible structures in incompressible flow.The artificial added mass effect is caused by the lag in exchange of interfacial displacements and forces between the fluid and solid solvers in partitioned algorithms.The artificial added mass effect is much more prominent for light/flexible struc-tures moving in water,because the fluid forces are in the same order of magnitude as the solid forces,and because the speed at which numerical errors propagate in an incom-pressible fluid.The new HC algorithm avoids numerical instability issues associated with artificial added mass effects by embedding Theodorsen's analytical approximation of the hydroelastic forces in the solution process to obtain better initial estimates of the displacements.Details of the new HC algorithm are presented.Numerical validation studies are shown for the forced pitching response of a steel and a plastic hydrofoil.The results show that the HC algorithm is able to converge faster,and is able to avoid numerical insta-bility issues,compared to standard LC and TC algorithms,when modeling the transient FSI response of a plastic hydrofoil.Although the HC algorithm is only demonstrated for a NACA0009 hydrofoil subject to pure pitching motion,the method can be easily extended to model general 3-D FSI response and stability of complex,flexible structures in turbulent,incompressible,multiphase flows. 展开更多
关键词 Fluid-structure interaction Viscous Incom-pressible Computational Added Mass Stability
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Fluid-structure interaction in Z-shaped pipe with different supports 认领 引用 被引量：6
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作者 Q.Guo J.X.Zhou X.L.Guan 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2020年第2期513-523,共11页
Fluid-structure interaction(FSI)has a strong relation with layout of fluid delivery system.FSI is liable to cause local damage.Thus,FSI analysis is necessary in many cases,especially for flexible pipe systems.FSI mode... Fluid-structure interaction(FSI)has a strong relation with layout of fluid delivery system.FSI is liable to cause local damage.Thus,FSI analysis is necessary in many cases,especially for flexible pipe systems.FSI modeling consists of eight governing equations and then completely solved via the finite volume method(FVM).Friction,Poisson and joint couplings were discussed in detail to reveal the influence of a Z-shaped pipe with different supports and elbows on FSI.After the feasibility of solving FSI by FVM was verified,the different effects of free,fixed and elastic supports on FSI in the commonly used and simplified Z-shaped pipe were further analyzed.Results indicated that different support stiffness lead to various FSI responses.If coupling occurs at the elbow and less support is considered,then the pipe has a relatively large amplitude and complex pressure fluctuation. 展开更多
关键词 Fluid-structure interaction Finite volume method Z-shaped pipe Support stiffness
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Fluid-Structure Interaction in Problems of Patient Specific Transcatheter Aortic Valve Implantation with and Without Paravalvular Leakage Complication 认领 引用 被引量：4
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作者 Adi Azriff Basri Mohammad Zuber +4 位作者 Ernnie Illyani Basri Muhammad Shukri Zakaria Ahmad Fazli Abd Aziz Masaaki Tamagawa Kamarul Arifin Ahmad 《Fluid Dynamics & Materials Processing》 EI 2021年第3期531-553,共23页
Paravalvular Leakage(PVL)has been recognized as one of the most dangerous complications in relation to Transcathether Aortic Valve Implantation(TAVI)activities.However,data available in the literature about Fluid Stru... Paravalvular Leakage(PVL)has been recognized as one of the most dangerous complications in relation to Transcathether Aortic Valve Implantation(TAVI)activities.However,data available in the literature about Fluid Structure Interaction(FSI)for this specific problem are relatively limited.In the present study,the fluid and structure responses of the hemodynamics along the patient aorta model and the aortic wall deformation are studied with the aid of numerical simulation taking into account PVL and 100%TAVI valve opening.In particular,the aorta without valve(AWoV)is assumed as the normal condition,whereas an aorta with TAVI 26 mm for 100%Geometrical Orifice Area(GOA)is considered as the patient aorta with PVL complication.A 3D patient-specific aorta model is elaborated using the MIMICS software.Implantation of the identical TAVI valve of Edward SAPIEN XT 26(Edwards Lifes ciences,Irvine,California)is considered.An undersized 26 mm TAVI valve with 100%valve opening is selected to mimic the presence of PVL at the aortic annulus.The present research indicates that the existence of PVL can increase the blood velocity,pressure drop and WSS in comparison to normal conditions,thereby paving the way to the development of recirculation flow,thrombus formation,aorta wall collapse,aortic rupture and damage of endothelium. 展开更多
关键词 Paravalvular Leakage(PVL) hemodynamics transcatheter aortic valve implantation(TAVI) fluid-structure interaction(FSI) edward sapien valve aortic valve(ESV) aortic stenosis(AS)
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Effect of Fluid-Structure Interaction on Sealed Flow Field and Leakage Rate Based on Computational Fluid Dynamics 认领 引用 被引量：7
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作者 汤赫男 王世杰 赵晶 《Journal of Shanghai Jiaotong university(Science)》 EI 2015年第3期326-330,共5页
This paper addresses the issue of reciprocating compressors staggered labyrinth seal structure. The internal flow field of sealed structure, the displacement of cylinder and piston for different tooth profile angles a... This paper addresses the issue of reciprocating compressors staggered labyrinth seal structure. The internal flow field of sealed structure, the displacement of cylinder and piston for different tooth profile angles are analyzed synchronously using FLUENT software, and the effects of fluid-structure interaction on the performance of the labyrinth seal are revealed. The results indicate that with the growth of tooth profile angle, the leakage rate of labyrinth seal tends to decrease first, and then increase. The results of fluid-structure interaction analysis are close to those of actual engineering. The effect of fluid-structure interaction makes tiny deformation in calculation mesh of piston and cylinder structure, and the coupling interaction affects the performance of the labyrinth seal. 展开更多
关键词 reciprocating compressor labyrinth seal fluid-structure interaction sealed flow field leakage rate
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3D numerical simulation on fluid-structure interaction of structure subjected to underwater explosion with cavitation 认领 引用 被引量：3
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作者 张阿漫 任少飞 +1 位作者 李青 李佳 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2012年第9期1191-1206,共16页
In the underwater-shock environment, cavitation occurs near the structural surface. The dynamic response of fluid-structure interactions is influenced seriously by the cavitation effects. It is also the difficulty in ... In the underwater-shock environment, cavitation occurs near the structural surface. The dynamic response of fluid-structure interactions is influenced seriously by the cavitation effects. It is also the difficulty in the field of underwater explosion. With the traditional boundary element method and the finite element method （FEM）, it is difficult to solve the nonlinear problem with cavitation effects subjected to the underwater explosion. To solve this problem, under the consideration of the cavitation effects and fluid compressibility, with fluid viscidity being neglected, a 3D numerical model of transient nonlinear fluid-structure interaction subjected to the underwater explosion is built. The fluid spectral element method （SEM） and the FEM are adopted to solve this model. After comparison with the FEM, it is shown that the SEM is more precise than the FEM, and the SEM results are in good coincidence with benchmark results and experiment results. Based on this, combined with ABAQUS, the transient fluid-structure interaction mechanism of the 3D submerged spherical shell and ship stiffened plates subjected to the underwater explosion is discussed, and the cavitation region and its influence on the structural dynamic responses are presented. The paper aims at providing references for relevant research on transient fluid-structure interaction of ship structures subjected to the underwater explosion. 展开更多
关键词 underwater explosion spectral element method （SEM） fluid-structure interaction cavitation stiffened plate
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Simulation of fluid-structure interaction in a microchannel using the lattice Boltzmann method and size-dependent beam element on a graphics processing unit 认领 引用 被引量：4
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作者 Vahid Esfahanian Esmaeil Dehdashti Amir Mehdi Dehrouye-Semnani 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第8期389-395,共7页
Fluid-structure interaction （FSI） problems in microchannels play a prominent role in many engineering applications. The present study is an effort toward the simulation of flow in microchannel considering FSI. The b... Fluid-structure interaction （FSI） problems in microchannels play a prominent role in many engineering applications. The present study is an effort toward the simulation of flow in microchannel considering FSI. The bottom boundary of the microchannel is simulated by size-dependent beam elements for the finite element method （FEM） based on a modified cou- ple stress theory. The lattice Boltzmann method （LBM） using the D2Q13 LB model is coupled to the FEM in order to solve the fluid part of the FSI problem. Because of the fact that the LBM generally needs only nearest neighbor information, the algorithm is an ideal candidate for parallel computing. The simulations are carried out on graphics processing units （GPUs） using computed unified device architecture （CUDA）. In the present study, the governing equations are non-dimensionalized and the set of dimensionless groups is exhibited to show their effects on micro-beam displacement. The numerical results show that the displacements of the micro-beam predicted by the size-dependent beam element are smaller than those by the classical beam element. 展开更多
关键词 fluid-structure interaction graphics processing unit lattice Boltzmann method size-dependentbeam element
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