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Unstructured Grid Immersed Boundary Method for Numerical Simulation of Fluid Structure Interaction 被引量:2
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作者 明平剑 孙扬哲 +1 位作者 段文洋 张文平 《Journal of Marine Science and Application》 2010年第2期181-186,共6页
This paper presents an improved unstructured grid immersed boundary method.The advantages of both immersed boundary method and body fitted grids which are generated by unstructured grid technology are used to enhance ... This paper presents an improved unstructured grid immersed boundary method.The advantages of both immersed boundary method and body fitted grids which are generated by unstructured grid technology are used to enhance the computation efficiency of fluid structure interaction in complex domain.The Navier-Stokes equation was discretized spacially with collocated finite volume method and Euler implicit method in time domain.The rigid body motion was simulated by immersed boundary method in which the fluid and rigid body interface interaction was dealt with VOS(volume of solid) method.A new VOS calculation method based on graph was presented in which both immersed boundary points and cross points were collected in arbitrary order to form a graph.The method is verified with flow past oscillating cylinder. 展开更多
关键词 fluid structure interaction immersed boundary method VOS unstructured grids finite volume method
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An improved algorithm for fluid-structure interaction of high-speed trains under crosswind 被引量:32
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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 ... 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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Vibration analysis of fluid- structure interaction in water hammer based on transfer matrix method 被引量:1
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作者 GAO Hui TANG Xuelin 《排灌机械工程学报》 EI CSCD 北大核心 2016年第6期518-524,共7页
In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation... In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation mathematical model of fluid-structure interaction(FSI)was developed.Then,the transfer matrix method(TMM)was used to calculate the modal frequency,modal shape and frequency response.The results were compared with that in experiment to verify the correctness of the TMM and the results show that the fluid-structure coupling has a greater impact on the modal frequencies than the modal shape.Finally,the influence on the response spectrum of different damping ratios was studied and the results show that the natural frequency under different damping ratios has changed little but there is a big difference for the pressure spectrum.With the decreasing of damping ratio,the damping of the system on frequency spectrum is more and more significant and the dispersion and dissipation is more and more apparent.Therefore the appropriate damping ratio should be selected to minimize the effects of the vibration of the FSI.The results provide references for the theory research of FSI in the transient process. 展开更多
关键词 water hammer fluid-structure interaction transfer matrix method vibration analysis
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ALE Fractional Step Finite Element Method for Fluid-Structure Nonlinear Interaction Problem 被引量:1
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作者 岳宝增 《Journal of Beijing Institute of Technology》 EI CAS 2006年第1期5-8,共4页
A computational procedure is developed to solve the problems of coupled motion of a structure and a viscous incompressible fluid. In order to incorporate the effect of the moving surface of the structure as well as th... A computational procedure is developed to solve the problems of coupled motion of a structure and a viscous incompressible fluid. In order to incorporate the effect of the moving surface of the structure as well as the free surface motion, the arbitrary Lagrangian-Eulerian formulation is employed as the basis of the finite element spatial discretization. For numerical integration in time, the fraction,step method is used. This method is useful because one can use the same linear interpolation function for both velocity and pressure. The method is applied to the nonlinear interaction of a structure and a tuned liquid damper. All computations are performed with a personal computer. 展开更多
关键词 Navier-Stokes equation arbitrary Lagrangian-Eulerian (ALE) finite element method fractional method fluid-structure interaction
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A Coupled ISPH-TLSPH Method for Simulating Fluid-Elastic Structure Interaction Problems
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作者 A.M.Salehizadeh A.R.Shafiei 《Journal of Marine Science and Application》 CSCD 2022年第1期15-36,共22页
A fully Lagrangian algorithm for numerical simulation of fluid-elastic structure interaction(FSI)problems is developed based on the Smoothed Particle Hydrodynamics(SPH)method.The developed method corresponds to incomp... A fully Lagrangian algorithm for numerical simulation of fluid-elastic structure interaction(FSI)problems is developed based on the Smoothed Particle Hydrodynamics(SPH)method.The developed method corresponds to incompressible fluid flows and elastic structures.Divergence-free(projection based)incompressible SPH(ISPH)is used for the fluid phase,while the equations of motion for structural dynamics are solved using Total Lagrangian SPH(TLSPH)method.The temporal pressure noise can occur at the free surface and fluid-solid interfaces due to errors associated with the truncated kernels.A FSI particle shifting scheme is implemented to produce sufficiently homogeneous particle distributions to enable stable,accurate,converged solutions without noise in the pressure field.The coupled algorithm,with the addition of proposed particle shifting scheme,is able to provide the possibility of simultaneous integration of governing equations for all particles,regardless of their material type.This remedy without need for tuning a new parameter,resolves the unphysical discontinuity beneath the interface of fluid-solid media.The coupled ISPH-TLSPH scheme is used to simulate several benchmark test cases of hydro-elastic problems.The method is validated by comparison of the presented results with experiments and numerical simulations from other researchers. 展开更多
关键词 Smoothed particle hydrodynamics Incompressible SPH Total Lagrangian SPH fluidelastic structure interaction fsi particle shifting scheme
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Numerical Simulation of ATPS Parachute Transient Dynamics Using Fluid-Structure Interaction Method
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作者 Fan Yuxin Xia Jian 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2017年第5期535-542,共8页
In order to simulate and analyze the dynamic characteristics of the parachute from advanced tactical parachute system(ATPS),a nonlinear finite element algorithm and a preconditioning finite volume method are employed ... In order to simulate and analyze the dynamic characteristics of the parachute from advanced tactical parachute system(ATPS),a nonlinear finite element algorithm and a preconditioning finite volume method are employed and developed to construct three dimensional parachute fluid-structure interaction(FSI)model.Parachute fabric material is represented by membrane-cable elements,and geometrical nonlinear algorithm is employed with wrinkling technique embedded to simulate the large deformations of parachute structure by applying the NewtonRaphson iteration method.On the other hand,the time-dependent flow surrounding parachute canopy is simulated using preconditioned lower-upper symmetric Gauss-Seidel(LU-SGS)method.The pseudo solid dynamic mesh algorithm is employed to update the flow-field mesh based on the complex and arbitrary motion of parachute canopy.Due to the large amount of computation during the FSI simulation,massage passing interface(MPI)parallel computation technique is used for all those three modules to improve the performance of the FSI code.The FSI method is tested to simulate one kind of ATPS parachutes to predict the parachute configuration and anticipate the parachute descent speeds.The comparison of results between the proposed method and those in literatures demonstrates the method to be a useful tool for parachute designers. 展开更多
关键词 parachute dynamics fluid-structure interaction nonlinear structure dynamics time dependent flow parallel computation technique
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Three-Dimensional Fluid-Structure Interaction Case Study on Cubical Fluid Cavity with Flexible Bottom
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作者 Stefano Ghelardi Cesare Rizzo Diego Villa 《Journal of Marine Science and Application》 CSCD 2017年第4期382-394,共13页
In this paper, we report our study on a numerical fluid-structure interaction problem originally presented by Mok et al.(2001) in two dimensions and later studied in three dimensions by Valdés Vazquez(2007), Lomb... In this paper, we report our study on a numerical fluid-structure interaction problem originally presented by Mok et al.(2001) in two dimensions and later studied in three dimensions by Valdés Vazquez(2007), Lombardi(2012), and Trimarchi(2012). We focus on a 3D test case in which we evaluated the sensitivity of several input parameters on the fluid and structural results. In particular, this analysis provides a starting point from which we can look deeper into specific aspects of these simulations and analyze more realistic cases, e.g., in sails design. In this study, using the commercial software ADINATM, we addressed a well-known unsteadiness problem comprising a square box representing the fluid domain with a flexible bottom modeled with structural shell elements. We compared data from previously published work whose authors used the same numerical approach, i.e., a partitioned approach coupling a finite volume solver(for the fluid domain) and a finite element solver(for the solid domain). Specifically, we established several benchmarks and made comparisons with respect to fluid and solid meshes, structural element types, and structural damping, as well as solution algorithms. Moreover, we compared our method with a monolithic finite element solution method. Our comparisons of new and old results provide an outline of best practices for such simulations. 展开更多
关键词 fluid-structure interaction BENCHMARK finite volume method finite element method partitioned MONOLITHIC ADINA^(TM)
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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
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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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MPS-FEM Coupled Method for Study of Wave-Structure Interaction 被引量:3
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作者 Guanyu Zhang Xiang Chen Decheng Wan 《Journal of Marine Science and Application》 CSCD 2019年第4期387-399,共13页
Nowadays,an increasing number of ships and marine structures are manufactured and inevitably operated in rough sea.As a result,some phenomena related to the violent fluid-elastic structure interactions(e.g.,hydrodynam... Nowadays,an increasing number of ships and marine structures are manufactured and inevitably operated in rough sea.As a result,some phenomena related to the violent fluid-elastic structure interactions(e.g.,hydrodynamic slamming on marine vessels,tsunami impact on onshore structures,and sloshing in liquid containers)have aroused huge challenges to ocean engineering fields.In this paper,the moving particle semi-implicit(MPS)method and finite element method(FEM)coupled method is proposed for use in numerical investigations of the interaction between a regular wave and a horizontal suspended structure.The fluid domain calculated by the MPS method is dispersed into fluid particles,and the structure domain solved by the FEM method is dispersed into beam elements.The generation of the 2D regular wave is firstly conducted,and convergence verification is performed to determine appropriate particle spacing for the simulation.Next,the regular wave interacting with a rigid structure is initially performed and verified through the comparison with the laboratory experiments.By verification,the MPS-FEM coupled method can be applied to fluid-structure interaction(FSI)problems with waves.On this basis,taking the flexibility of structure into consideration,the elastic dynamic response of the structure subjected to the wave slamming is investigated,including the evolutions of the free surface,the variation of the wave impact pressures,the velocity distribution,and the structural deformation response.By comparison with the rigid case,the effects of the structural flexibility on wave-elastic structure interaction can be obtained. 展开更多
关键词 MPS-FEM coupled method fluid-structure interaction(fsi) Regular wave Wave impact pressure structure deformation response
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A transient fiuid–structure interaction analysis strategy and validation of a pressurized reactor with regard to loss-ofcoolant accidents 被引量:1
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作者 Ying-Chao Ma Xie-Lin Zhao +2 位作者 Xian-Hui Ye Nai-Bin Jiang Jin-Xiong Zhou 《Nuclear Science and Techniques》 SCIE CAS CSCD 2020年第6期11-21,共11页
A loss-of-coolant accident(LOCA)is one of the basic design considerations for nuclear reactor safety analysis.A LOCA induces propagation of a depressurization wave in the coolant,exerting hydrodynamic forces on struct... A loss-of-coolant accident(LOCA)is one of the basic design considerations for nuclear reactor safety analysis.A LOCA induces propagation of a depressurization wave in the coolant,exerting hydrodynamic forces on structures viafiuid–structure interaction(FSI).The analysis of hydrodynamic forces on the core structures during a LOCA process is indispensable.We describe the implementation of a numerical strategy for prestressed structures.It consists of an initialization and a restarted transient analysis process,all implemented via the ANSYS Workbench by system coupling of ANSYS and Fluent.Our strategy is validated by making extensive comparisons of the pressures,displacements,and strains on various locations between the simulation and reported measurements.The approach is appealing for dynamic analysis of other prestressed structures,owing to the good popularity and acknowledgement of ANSYS and Fluent in both academia and industry. 展开更多
关键词 Loss-of-coolant accident(LOCA) fluidstructure interaction(fsi) Finite element method Prestressed structure structural dynamics
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Design of Ocean Floating Structures:Prediction of Hydrodynamic Coefficients
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作者 LI Wei FAN Shaotao +1 位作者 WANG Jinxi LIU Tianhui 《南方能源建设》 2024年第6期18-32,共15页
[Introduction] Accurate calculation of the hydrodynamic coefficients for floating structures and the investigation of the flow field distribution around floating bodies on the marine free surface are essential for imp... [Introduction] Accurate calculation of the hydrodynamic coefficients for floating structures and the investigation of the flow field distribution around floating bodies on the marine free surface are essential for improving the engineering design and application of marine structures.[Method] This study utilized the computational fluid dynamics(CFD) approach and the Reynolds Averaged NavierStokes(RANS) method and considered the effects of viscosity and free surface interactions on the hydrodynamic behavior of floating structures.By employing the dynamic mesh technique,this study simulated the periodic movements of simplified three-dimensional(3D)shapes:spheres,cylinders,and cubes,which were representative of complex marine structures.The volume of fluid(VOF) method was leveraged to accurately track the nonlinear behavior of the free surface.In this analysis,the added mass and damping coefficients for the fundamental modes of motion(surge,heave,and roll) were calculated across a spectrum of frequencies,facilitating the fast determination of hydrodynamic forces and moments exerted on floating structures.[Result] The results of this study are not only consistent with the results of the 3D potential flow theory but also further reflect the role of viscosity.This method can be used for precise calculation of the hydrodynamic coefficients of floating structures and for describing the flow field of such structures in motion on a free surface.[Conclusion] The methodology presented goes beyond the traditional potential flow approach. 展开更多
关键词 Computational fluid dynamics ocean floating structures hydrodynamic coefficients fluid-structure interaction
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Numerical Simulation of the Solitary Wave Interacting with an Elastic Structure Using MPS-FEM Coupled Method 被引量:2
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作者 Chengping Rao Youlin Zhang Decheng Wan 《Journal of Marine Science and Application》 CSCD 2017年第4期395-404,共10页
Fluid-Structure Interaction(FSI) caused by fluid impacting onto a flexible structure commonly occurs in naval architecture and ocean engineering. Research on the problem of wave-structure interaction is important to e... Fluid-Structure Interaction(FSI) caused by fluid impacting onto a flexible structure commonly occurs in naval architecture and ocean engineering. Research on the problem of wave-structure interaction is important to ensure the safety of offshore structures. This paper presents the Moving Particle Semi-implicit and Finite Element Coupled Method(MPS-FEM) to simulate FSI problems. The Moving Particle Semi-implicit(MPS) method is used to calculate the fluid domain, while the Finite Element Method(FEM) is used to address the structure domain. The scheme for the coupling of MPS and FEM is introduced first. Then, numerical validation and convergent study are performed to verify the accuracy of the solver for solitary wave generation and FSI problems. The interaction between the solitary wave and an elastic structure is investigated by using the MPS-FEM coupled method. 展开更多
关键词 MESH-FREE METHOD moving particle SEMI-IMPLICIT finite element METHOD fluid-structure interaction SOLITARY wave
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附加质量法和FSI法用于弧形闸门动力特性分析的适用性 被引量:2
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作者 胡友一 王珏 +1 位作者 陆中伟 郑赟 《中国港湾建设》 2024年第1期1-6,共6页
为研究附加质量法和流固耦合界面(FSI)法用于弧形闸门动力特性分析的适用性,首先通过建立弧形闸门有限元模型,采用收敛性分析的方法研究了FSI法计算时流体长度的合理取值,保证了流体-弧形闸门系统自振频率的计算精度。其次,从弧形闸门... 为研究附加质量法和流固耦合界面(FSI)法用于弧形闸门动力特性分析的适用性,首先通过建立弧形闸门有限元模型,采用收敛性分析的方法研究了FSI法计算时流体长度的合理取值,保证了流体-弧形闸门系统自振频率的计算精度。其次,从弧形闸门水头高度和刚度的角度出发,比较了采用附加质量法和FSI法对弧形闸门流固耦合效应的模拟结果,讨论了采用简化的附加质量法的适用性。最后,根据有限元计算的数值结果讨论了流固耦合效应对弧形闸门动力特性的影响。结果表明:(1)FSI法中流体长度取2倍水头高度可代替实际流体的无界性;(2)在水头较低且闸门刚度较大的情况下,采用附加质量法模拟流固耦合效应能在保证计算精度的基础上提高计算效率。随着水头增高,精度有所下降。此时,弧形闸门的自振频率明显降低,并且主要的变形由支臂转移到面板,有必要采用FSI法代替附加质量法来确保计算精度。 展开更多
关键词 弧形闸门 流固耦合 附加质量法 fsi 自振频率
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核电厂立式圆柱储罐动态特性分析方法研究
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作者 沈睿 陈孟 +1 位作者 陶宏新 黄庆 《核科学与工程》 北大核心 2025年第1期75-82,共8页
基于HOUSNER理论和流固耦合相互作用理论对大型立式圆柱储罐的动态特性展开研究。采用ANSYS有限元软件Fluid80单元建立流固耦合有限元模型,并采用Reduced法进行模态分析,对典型低矮型和细高型锚固储罐在1/4、1/2、3/4和设计装液量H下的... 基于HOUSNER理论和流固耦合相互作用理论对大型立式圆柱储罐的动态特性展开研究。采用ANSYS有限元软件Fluid80单元建立流固耦合有限元模型,并采用Reduced法进行模态分析,对典型低矮型和细高型锚固储罐在1/4、1/2、3/4和设计装液量H下的动态特性进行研究,并对两种模型得出的液面第一阶晃动频率和储罐系统第一阶主振形频率进行对比分析。通过对比基于HOUSNER理论的模型和流固耦合模型的计算结果,对HOUSNER理论公式进行修正,计算结果表明,本文提出的基于HOUSNER理论的修正模型与流固耦合模型计算结果更加接近,本文提出的HOUSENER理论修正模型所预测的储罐第一阶主振形频率最大误差比HOUSENER理论模型降低7.41%,改进了HOUSNER理论公式的不保守性,为核电厂大型储罐的抗震设计提供参考。 展开更多
关键词 立式圆柱储罐 模态分析 流固耦合 动态特性 核电厂
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水流攻角对有限长圆柱涡激振动影响机理研究
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作者 段德荣 代森良 +3 位作者 王慕豪 张晓娅 张辉 杨学锋 《振动与冲击》 北大核心 2025年第8期80-88,共9页
海工装备中有限长圆柱不同的工作姿态会产生不同的水流攻角冲击作用,为了揭示水流攻角对有限长圆柱涡激振动响应的影响机理,采用三维非定常雷诺平均Navier-Stokes方程和剪切应力传输k-ω模型,对不同攻角下有限长圆柱进行双向流固耦合数... 海工装备中有限长圆柱不同的工作姿态会产生不同的水流攻角冲击作用,为了揭示水流攻角对有限长圆柱涡激振动响应的影响机理,采用三维非定常雷诺平均Navier-Stokes方程和剪切应力传输k-ω模型,对不同攻角下有限长圆柱进行双向流固耦合数值计算,并通过试验验证了数值结果的准确性。研究结果表明,攻角的增大会使结构两侧流体流速不平衡加剧,升力和阻力均增大,且升力比阻力变化明显,导致有限长圆柱的振动响应随攻角增大而提高。当攻角由0°增大到2°和4°时,自由端横流向振幅分别增加了7.3%和21.2%,顺流向振幅分别增加了6.3%和24.6%,顺流向涡激振动的振动主频不再是横流向的2倍。由于自由端和固定端的存在,干扰了圆柱后方漩涡的形成和脱落,攻角越大,尾流漩涡脱落的宽度越宽,有限长圆柱振动幅值越大。 展开更多
关键词 水流攻角 涡激振动 流固耦合 有限长 自由端
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基于非线性动力学稀疏辨识的涡致振动系统建模
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作者 季廷炜 王亮 +2 位作者 谢芳芳 张鑫帅 郑畅东 《浙江大学学报(工学版)》 北大核心 2025年第2期402-412,432,共12页
以二维和三维圆柱涡致振动(VIV)系统为研究对象,通过非线性动力学稀疏辨识(SINDy)的方法,识别VIV系统的结构响应模型和尾流振荡模型.对模型进行验证和分析,得到VIV系统的流固耦合模型,实现不同缩减速度下圆柱VIV位移和速度响应的预测.... 以二维和三维圆柱涡致振动(VIV)系统为研究对象,通过非线性动力学稀疏辨识(SINDy)的方法,识别VIV系统的结构响应模型和尾流振荡模型.对模型进行验证和分析,得到VIV系统的流固耦合模型,实现不同缩减速度下圆柱VIV位移和速度响应的预测.结果表明,采用SINDy算法,识别了带有附加阻尼的二维VIV系统的结构响应模型.该模型与流固耦合系统的动力学特征表现出明显的规律:当涡致振动系统处于锁定(lock-in)区域时,附加阻尼随缩减速度变大而基本保持不变,结构的无量纲最大振幅保持在较高水平;当涡致振动系统处于非锁定区域时,附加阻尼随缩减速度变大而呈现线性下降的特征,结构的无量纲振幅保持在较低水平.基于SINDy方法识别的二维VIV系统流固耦合模型和三维VIV系统结构响应模型有较好的预测能力,其中二维VIV系统流固耦合模型有一定的泛化能力.模型预测值能够表征原系统的运动特征,对二维VIV系统结构位移响应预测的相对误差小于6%,结构速度响应预测的相对误差小于5%,对三维VIV系统结构位移和速度响应预测的相对误差小于4%. 展开更多
关键词 稀疏辨识 涡致振动 流固耦合 降阶模型 非线性动力学
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一种基于浸没边界-大涡模拟的降落伞流固耦合计算方法
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作者 张扬 濮天梅 +2 位作者 周春华 欧阳弘扬 童旭东 《空气动力学学报》 北大核心 2025年第2期96-109,I0002,共15页
降落伞充气过程涉及复杂的流固耦合(fluid-structure interaction,FSI)现象,浸没边界(immersed boundary,IB)方法作为一种边界非协调方法,适合处理这种非线性大变形FSI问题。将Mittal等提出的尖锐界面IB方法与大涡模拟(large eddy simul... 降落伞充气过程涉及复杂的流固耦合(fluid-structure interaction,FSI)现象,浸没边界(immersed boundary,IB)方法作为一种边界非协调方法,适合处理这种非线性大变形FSI问题。将Mittal等提出的尖锐界面IB方法与大涡模拟(large eddy simulation,LES)相结合(LES/IB),应用于中高雷诺数(Re)降落伞绕流的模拟。在此基础上,结合非线性有限元方法,建立了一种基于适合复杂外形非均匀湍流的动态Vreman亚格子(Vreman subgrid-scale,Vreman SGS)模型的FSI方法,用于模拟降落伞充气过程。最后,通过经典的圆柱绕流算例(Re=3900)验证所发展的LES/IB方法的准确性。结果表明,LES/IB方法对平均阻力系数(C_(D))、后缘点平均背压系数(-C_(p,b))和斯特劳哈尔数(St)的计算结果与直接数值模拟、LES和实验结果吻合较好,误差均低于8%。此外,利用发展的Vreman SGS模型对典型的圆伞和十字伞充气过程中的气动性能和结构响应进行了分析,并与Smagorinsky SGS模型进行了对比。结果表明,在降落伞充气呼吸阶段,两者对阻力系数和投影面积的计算结果吻合较好,相对误差均在5%以内,验证了本文FSI方法的可靠性。 展开更多
关键词 降落伞充气 流固耦合 浸没边界方法 大涡模拟 亚格子模型
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基于梯形泡沫铝复合夹层结构的新型船–桥碰撞防护装置损伤特性研究
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作者 刘昆 张子阳 +1 位作者 王加夏 俞同强 《船舶力学》 北大核心 2025年第4期629-644,共16页
随着交通运输业的高速发展,船–桥碰撞事故时有发生并带来相关人员生命、财产损失,船–桥防撞设施在保护桥梁结构的同时也能降低船舶的损伤。针对传统钢制套箱刚度大、防护位置固定等不足,本文基于梯形泡沫铝复合夹层结构设计自浮式新... 随着交通运输业的高速发展,船–桥碰撞事故时有发生并带来相关人员生命、财产损失,船–桥防撞设施在保护桥梁结构的同时也能降低船舶的损伤。针对传统钢制套箱刚度大、防护位置固定等不足,本文基于梯形泡沫铝复合夹层结构设计自浮式新型船–桥防撞装置,通过有限元软件LS–DYNA建立考虑了桩–水–土耦合的船–防撞装置–桥墩碰撞模型,开展典型碰撞载荷作用的船–防撞装置–桥墩损伤特性研究,评估了不同的船速、船撞角度等因素下防撞装置的耐撞性能。结果表明,该防撞装置具备优异的缓冲、吸能特性,能有效降低碰撞力峰值,延长碰撞作用时间,在减小桥墩损伤的同时可以有效减小船艏结构损伤。 展开更多
关键词 船–桥碰撞 梯形泡沫铝复合夹层结构 防撞装置 流固耦合 损伤特性
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低雷诺数下偏心扭转圆柱涡激振动特性研究
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作者 孙旭 SUHC.Steve 张家忠 《力学与实践》 2025年第1期87-97,共11页
横掠外流冲击下细长圆柱结构涡激振动问题在工程中广泛存在,已有研究多关注圆柱沿横向和/或流向的振动响应,对涡激扭转振动研究较少。本文采用流-固耦合数值模拟研究了偏心扭转圆柱在层流中的涡激振动特性。首先,建立了偏心扭转圆柱涡... 横掠外流冲击下细长圆柱结构涡激振动问题在工程中广泛存在,已有研究多关注圆柱沿横向和/或流向的振动响应,对涡激扭转振动研究较少。本文采用流-固耦合数值模拟研究了偏心扭转圆柱在层流中的涡激振动特性。首先,建立了偏心扭转圆柱涡激振动力学模型,推导了控制方程和边界条件。然后,将基于特征线算子分裂的有限元解法、双时间步法、边弹簧近似法、广义-α方法和松耦合迭代解法相结合,针对层流诱发刚体扭转振动开发了一种通用流-固耦合解法,并采用基准算例进行了验证。最后,通过流-固耦合数值模拟,系统分析了偏心距、雷诺数、质量比对层流中偏心扭转圆柱涡激振动振幅、频率、流体载荷的影响规律及机理。 展开更多
关键词 圆柱 层流 涡激扭转振动 流-固耦合 数值模拟
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核岛结构PCS水箱FSI效应简化方法研究 被引量:4
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作者 李小军 宋辰宁 +1 位作者 周国良 魏超 《振动与冲击》 EI CSCD 北大核心 2019年第2期6-12,32,共8页
高置冷却水箱是核电厂非能动安全壳冷却系统(PCS)的重要组成部分,在进行动力分析时,必须考虑冷却水与屏蔽厂房之间的流固耦合(FSI)效应。由于FSI效应问题复杂,数值分析耗时较长,因此,在研究核岛结构动力分析时,有必要采用简化方法,在满... 高置冷却水箱是核电厂非能动安全壳冷却系统(PCS)的重要组成部分,在进行动力分析时,必须考虑冷却水与屏蔽厂房之间的流固耦合(FSI)效应。由于FSI效应问题复杂,数值分析耗时较长,因此,在研究核岛结构动力分析时,有必要采用简化方法,在满足计算精度要求的前提下,提高计算效率。基于Housner模型,提出一种考虑液体-水箱相互作用的简化模型。采用ADINA软件分别进行水箱FSI模型和简化模型的核岛结构三向地震反应分析,分析了FSI模型和简化模型结构反应的峰值加速度、楼层反应谱和有效应力相对误差。结果表明:提出的水箱简化模型可用于高置冷却水箱核岛结构三向地震反应分析,能够很好地模拟FSI效应。 展开更多
关键词 核岛结构 流固耦合(fsi) 简化方法 地震反应
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