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Forced vibrations of a FGM thin-walled cylinder under fluid loading

ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK 2025年第1期76卷 1-13页

作者： Yucel, Hazel Baskent Univ Dept Comp Engn Baglica Campus TR-06790 Ankara Turkiye

Forced low-frequency vibrations of a functionally graded thin-walled cylindrical shell submerged in a compressible fluid are investigated. The problem undergoes asymptotic analysis aimed at elucidating smallest resonances. The associated explicit estimates are derived, including the formulae for the imaginary quantities corresponding to the radiation of vibration energy. The robust approximate relations for stress and displacement components are also obtained. Numerical results are presented for two particular setups demonstrating the effect of transverse inhomogeneity on the dynamic behavior of the FGM cylinder.

关键词： fluid-structure interaction Functionally graded Asymptotic Thin elastic shell Resonant vibration

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Simulating fish autonomous swimming behaviours using deep reinforcement learning based on Kolmogorov-Arnold Networks

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BIOINSPIRATION & BIOMIMETICS 2025年第2期20卷 026001-026001页

作者： Li, Tao Zhang, Chunze Zhang, Guibin Zhou, Qin Hou, Ji Diao, Wei Meng, Wanwan Zhang, Xujin Chongqing Jiaotong Univ Southwest Res Inst Hydraul & Water Transport Engn Chongqing Peoples R China Chongqing Jiaotong Univ Coll River & Ocean Engn Chongqing Peoples R China Chongqing Jiaotong Univ Chongqing Xike Consulting Co LTD Water Transport E Chongqing Peoples R China

The study of fish swimming behaviours and locomotion mechanisms holds significant scientific and engineering value. With the rapid advancements in artificial intelligence, a new method combining deep reinforcement learning (DRL) with computational fluid dynamics has emerged and been applied to simulate the fish's adaptive swimming behaviour, where the complex fish behaviour is decoupled to focus on the fish's response to the hydrodynamic field, and the simulation is driven by reward-based objectives to model the fish's swimming behaviour. However, the scale of this cross-disciplinary method is directly affected by the efficiency of the DRL model. To promote it to more general application scenarios, there is a pressing need for further research on more efficient and economical network architectures to address the challenge of approximating state-value function in high-dimensional, dynamic, and uncertain environments. Building upon a previously proposed computational platform for the simulation of fish autonomous swimming behaviour, we integrated Kolmogorov-Arnold Networks(KANs) and tested their performance in point-to-point swimming and K & aacute;rm & aacute;n gait swimming environments. Experimental results demonstrated that, compared to long short-term memory Networks(LSTMs) and multilayer perceptron networks(MLPs), the introduction of KANs significantly enhanced the perception and decision-making abilities of the intelligent fish in complex fluid environments. With a smaller network scale, in the point-to-point swimming case, KANs effectively approximated the state-value function, achieving average reward improvements of up to 88.0% and 94.1% over MLPs and LSTMs networks, respectively, and increased by 766.7% and 105.6% in the K & aacute;rm & aacute;n gait swimming case. Under comparable network sizes, the intelligent fish with KANs exhibited faster learning capabilities and more stable swimming performance in complex fluid settings.

关键词： deep reinforcement learning Kolmogorov-Arnold representation theorem virtual intelligent fish fluid-structure interaction immersed boundary-lattice boltzmann method

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A solution for vibration analysis of fluid-filled pipe coupled with complex support and flexible base

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE 2025年第5期239卷 1624-1638页

作者： Gong, Jingfeng Diao, Yingbo Xuan, Lingkuan Yang, Jizhuang Li, Yong Wuhan Univ Sci & Technol Sch Automobile & Traff Engn Wuhan 430081 Peoples R China Xinxiang Vocat & Tech Coll Basic Curriculum Teaching Dept Xinxiang Peoples R China

In this paper, the transfer matrix method (TMM) is developed for fluid-filled pipe vibration isolation system. The mathematical model of the support is established using the four-polo parameters method and the flexible base is used as the impedance boundary. The four-polo parameters and impedance are obtained by the finite element method (FEM). Drawing on the idea of the absorption transfer matrix method (ATMM), the support and flexible base are regarded as special branch pipe, and the overall transfer matrix of the system is established for frequency domain solution. The calculation results are compared with the results from the published literature and FEM to validate the accuracy of the method. And then the influences of support stiffness and damping on the forced vibration characteristics of the branch pipeline system are discussed, which can provide some reference for the vibration and noise control of pipe systems.

关键词： Pipe system fluid-structure interaction TMM vibration isolation system four-polo parameters

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Exploring optimal spacing in parallel fully-passive flapping-foil hydrokinetic turbines

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JOURNAL OF fluidS AND structureS 2025年 135卷

作者： Zantoute, Siham Eddine Duarte, Leandro Dellinger, Guilhem Dellinger, Nicolas Olivier, Mathieu Dumas, Guy Ghenaim, Abdellah Terfous, Abdelali Dept Fluid Mech Lab ICUBE Strasbourg France Natl Sch Water & Environm Engn Strasbourg France Natl Inst Appl Sci Strasbourg France Laval Univ Dept Mech Engn Lab Mecan Fluides Numer Quebec City PQ Canada

The increasing global demand for sustainable energy has led to the exploration of hydrokinetic systems, particularly flapping foil turbines, which utilize fluid-structure interactions to harvest energy from water flows. This study investigates the optimization of spacing between fully passive oscillating foils arranged in parallel configuration to maximize energy extraction efficiency. Utilizing numerical simulations with OpenFOAM's overset mesh and URANS methods, the research examines the hydrodynamic performance and interaction effects of varying foil spacings, ranging from 3 to 15 chord lengths. For a specific configuration of a stall-flutter flapping foil turbine, results reveal that closer spacings (e.g., 3 chord lengths) can achieve comparable results to single-foil configurations, with solo efficiency eta = 0.299 and parallel efficiency eta = 0.304. The study further identifies a 15% increase in mean power coefficient at a spacing of d* = 5, linked to higher heave amplitude and strong fluid-structure interactions. The study highlights the potential of dual-foil setups to improve structural integrity and adaptability in diverse natural water currents. These findings offer valuable insights for the design and operation of hydrokinetic turbines, enhancing their feasibility as a sustainable energy solution.

关键词： Fully passive flapping foil Hydrokinetic turbine fluid-structure interaction Parallel foil configuration Foil spacing optimization Stall-flutter

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Homogenization based topology optimization of a coupled thermal fluid-structure problem

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COMPUTERS & structureS 2025年 308卷

作者： Agyekum, Godfred Oheneba Cangemi, Laurent Jouve, Francois IFP Energies Nouvelles F-92852 Rueil Malmaison France Univ Paris Cite Lab Jacques Louis LJLL L F-75006 Paris France

This article focuses on the topology optimization of a weakly coupled three physics problem. The structures are made of periodically perforated material, where the microscopic periodic cell is macroscopically modulated. The objective is to optimize the homogenized formulation of this system, where the coupling is weak because the three physics involved are solved consecutively: first, a coupled fluid flow is determined using the Biot-Darcy's law for the fluid domain, second, a thermal model using the convection-diffusion equation for the whole domain, and third, a three-physics problem by solving the linear poro-thermo elasticity problem in the solid domain. This approach allows low computational cost of evaluation of load sensitivities using the adjoint-state method. Twodimensional and three-dimensional numerical problems are presented using the alternate directions algorithm. It is demonstrated how the implementation makes it possible to treat a variety of design problems.

关键词： Topology optimization Multi-scale Periodic homogenization Porous medium Adjoint methods fluid-structure interaction Convective heat-transfer

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A displacement formulation for coupled elastoacoustic problems that preserves flow irrotationality

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JOURNAL OF SOUND AND VIBRATION 2025年 597卷

作者： Deng, Jie Guasch, Oriol Maxit, Laurent Chongqing Ind Polytech Coll Chongqing 401120 Peoples R China Univ Ramon Llull Human Environm Res HER Grp Dept Engn C-Quatre Camins 30 Barcelona 08022 Catalonia Spain INSA Lyon Lab Vibrat Acoust LVA 25 bis Ave Jean Capelle F-69621 Lyon France

Two-way fluid-structure interaction (FSI) problems, in the sense that a flow induces the motion of a solid, which in turn modifies the flow boundary conditions, have been approached with very different strategies, the most common of which is probably the finite element method (FEM). In the case of elastoacoustics, the flow consists of an acoustic field interacting with a vibrating structure. When the problem is discretized with the FEM, an algebraic block matrix system is obtained and the coupling between the acoustic field and the structure takes place through a coupling matrix with off-diagonal terms. Usually the structure is characterized by its displacement field, while for the acoustics several options are available, ranging from pressure to acoustic displacement or velocity/displacement acoustic potentials. Depending on the formulation, symmetric or asymmetric systems are obtained and different types of numerical stability problems have to be faced. In this work, a monolithic strategy based on the Rayleigh- Ritz method is proposed. The displacement is used as the primary variable for both the structure and the acoustic field and is expanded in terms of Gaussians as basis functions. This provides an algebraic block matrix system for the global uncoupled problem. However, instead of resorting to a coupling matrix, the essential continuity conditions at the acoustic-structure interface are imposed by the nullspace method (NSM). That is, the solution of the uncoupled system is expanded in terms of a basis of the nullspace generated by the essential conditions of the problem, including the displacement continuity constraints at the interface, thus giving the solution of the coupled problem. As for natural conditions, they are imposed in a weak sense. For ease of explanation, a one-dimensional (1D) case is first introduced, followed by the coupling of a 2D acoustic cavity with a beam and a 3D one with a plate. The proposed method is validated with FEM simulations on

关键词： fluid-structure interaction Vibroacoustics Elastoacoustics Displacement continuity Nullspace method

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Simulation study on damage behavior of a shallow-buried Foundation bridge under combined action of flood scouring and heavy vehicle load

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OCEAN ENGINEERING 2025年 323卷

作者： Wu, Tong Fan, Gangping Dou, Chuandong Li, Xing Dou, Chunyang Che, Jian Wang, Tianzhuo Rao, Jincheng Heilongjiang Univ Sch Civil Engn Harbin 150080 Peoples R China

Due to the insufficient burial depth of shallow-buried foundation bridges, foundation voiding easily occurs during floods or rapid water flows. When heavy vehicles pass over these partially voided bridges, the stress state of the foundation deteriorates instantaneously, causing critical components to exceed their load-bearing capacity in a short period, leading to a chain reaction that results in the rapid collapse and overall failure of the bridge structure. Previous numerical simulations of bridge water damage often neglected the strong coupling between water flow, soil, and structure during the scouring process. This paper applies a fluid-solid coupling simulation modeling method for bridge damage behavior under scouring action to study the structural damage behavior of shallow-buried foundation bridges under the combined effects of flood scouring and heavy vehicle load. This method employs point cloud reverse engineering technology to solve the difficult problem of converting the complex scour morphology around the foundation under flood scouring into a structural model, and investigates the multi-hazard damage behavior of shallow-buried foundations by coupling extreme hydraulic effects on the pier surface and placing the most unfavorable heavy vehicle loads on the bridge deck.

关键词： Shallow-buried foundation bridges Foundation voiding Point cloud reverse engineering technology fluid-structure interaction Heavy vehicle loading Flood scouring

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Modal dynamic and response spectrum analyses of rectangular flexible water containing structures through modified ground motion accelerations

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ENGINEERING structureS 2025年 325卷

作者： Bouaanani, Najib Kouhdasti, Ramtin Polytech Montreal Dept Civil Geol & Min Engn Montreal PQ H3C 3A7 Canada

This article introduces a new approach for the assessment of the seismic behaviour of water containing structures such as storage tanks or navigation lock chambers. The novelty of the proposed approach lies in its integration of earthquake-induced water impulsive effects into a modified version of the input ground motion acceleration and its response spectrum. The modified time-history and spectral ground motion accelerations can then be directly applied to a numerical model of the empty container built using standard finite elements, thus eliminating the need for specialized software capable of modelling fluid domains and dynamic fluid- structure interactions. The formulation and procedures of the proposed methods are detailed and showcased through application to the seismic analysis of two illustrative examples of a rectangular water storage tank and an asymmetrical navigation lock chamber subjected each to two ground motion accelerations. The results are discussed to highlight how the proposed techniques effectively dissect hydrodynamic effects along the contributions of each vibration mode. Key parameters such as displacements, shear forces, and stresses are evaluated, and their modal and total responses compared to those corresponding to empty containers to assess earthquake-induced hydrodynamic effects. The proposed approach is shown to be in excellent agreement with classical coupled solid-fluid finite element solutions.

关键词： Water-containing structures Seismic response fluid-structure interaction Water-storage tanks Dynamic modal time-history analysis Response spectrum analysis Hydrodynamic pressure Finite elements

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Numerical simulation and experimental study on non-invasive pipeline flow measurement based on distributed acoustic sensing

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MEASUREMENT 2025年 244卷

作者： Dai, Shu Liang, Lei Tong, Xiaoling Wang, Hui Wu, Rongchang Jiang, Ke Wuhan Univ Technol Coll Mech & Elect Engn Wuhan 430070 Peoples R China Wuhan Univ Technol Natl Engn Res Ctr Fiber Opt Sensing Technol & Netw Wuhan 430070 Peoples R China Wuhan Univ Technol Sanya Sci & Educ Innovat Pk Sanya 572000 Peoples R China

Non-intrusive flow measurement, utilizing fiber optic distributed acoustic sensing (DAS), is a crucial technological approach for efficient oil and gas extraction from wells. However, current research predominantly focuses on the feasibility of these methods, often neglecting a comprehensive theoretical discussion. This paper introduces and validates a theoretical analysis method for non-intrusive flow measurement based on DAS. We simulate the vibration of a turbulent pipeline through fluid-solid coupling, establish the mapping relationship between DAS measurements and the dynamic strain of the pipeline wall surface using the principles of DAS sensing and the spiral path of the pipeline wall surface, and examine the impact of different optical fiber winding methods on flow measurement. Simulation results indicate that under identical winding methods, the standard deviation of dynamic strain has a significant quadratic relationship with flow;a smaller winding pitch results in lower DAS signal strength, closer alignment with the internal pressure fluctuations of the pipeline, while a larger winding pitch results in higher DAS signal strength, closer alignment with the transverse vibration of the pipeline. These laws are further corroborated by experimental results. The research presented in this paper offers theoretical support and technical guidance for practical industrial applications.

关键词： Distributed Acoustic Sensing (DAS) Non-intrusive flow measurement fluid-structure interaction Dynamic strain Helical path

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Research on static loading method for aerodynamic effect of flexible airship

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JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING 2025年第1期47卷 1-14页

作者： Meng, Jingye Mao, Tianye Huang, Bin Zhao, Hongling Zhu, Rensheng Jie, Desuan Hefei Technol Coll Dept Mech & Elect Engn Hefei 230012 Peoples R China Hefei Univ Technol Sch Automot & Transportat Engn Hefei 230009 Peoples R China Hefei Univ Technol Sch Mech Engn Hefei 230009 Peoples R China Hefei Univ Technol Sch Instrument Sci & Optoelect Engn Hefei 230009 Peoples R China China Special Equipment Inspect & Res Inst Beijing 100029 Peoples R China

In this paper, the static loading method is presented for studying nonlinear aerodynamic effect of flexible airship in a low cost and convenient way. Firstly, the principles of the static loading method are proposed based on the simulation on a real airship. Secondly, the instrumentation system indoor is introduced to exert concentrated force on a scaled-down airship model. Then, both the static loading tests and simulation on the airship model are reported. Consequently, the simulated deformation contours are obtained and compared at three angles of attack by both aerodynamic load and concentrated forces. Moreover, the measured results of the deformations of five measured zones are compared with the simulated data. The results show the static loading method can effectively reflect the deformation distribution caused by aerodynamic loads on flexible airship. This method can provide a new convenient way to study the aerodynamic effect of flexible airship at low cost. Besides, this method can be applied to load measurement of flexible materials, such as inner curtain both the inside and outside of airship.

关键词： Airship Static loading method Numerical simulation fluid-structure interaction

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