Journal of Fluids and Structures最新文献

{"title":"Integration of vibration isolation and energy harvesting for a sandwich meta-pipe conveying fluid","authors":"An-Xiang Zhao ,&nbsp;Feng Liang ,&nbsp;Hua-Lin Yang","doi":"10.1016/j.jfluidstructs.2025.104376","DOIUrl":"10.1016/j.jfluidstructs.2025.104376","url":null,"abstract":"<div><div>This paper is aimed at exploring the potential of a composite meta-pipe conveying fluid for simultaneously suppressing vibration and collecting energy. The pipe features a sandwich design, with the outer layers composed of glass fiber-reinforced composite and the core layer made of carbon fiber-reinforced composite. Meanwhile, the pipe is periodically attached with piezoelectric layers connected with shunting circuits to both trigger frequency band gaps (BGs) and generate electricity. A point defect is further introduced into the pipe by modifying the position and length of the piezoelectric layers, enabling energy localization in the defect segment. Numerical results demonstrate the achieved dual functionality of the proposed fluid-structure interaction (FSI) integrated meta-structure, and reveal the essential relations between vibration isolation and energy harvesting. The FSI and composite effects on the dual functionality are elucidated. More importantly, the findings clarify the distinct roles of defect in energy harvesting across the Bragg scattering (BS) BG and locally resonant (LR) BG, highlighting the effects of different types of defect on the integration performance. This research will facilitate the development of smart pipe structures in engineering applications, and offer new perspectives on the vibration isolation and energy harvesting in FSI systems.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104376"},"PeriodicalIF":3.4,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel strategy for dissipating energy released from underwater collapse of structures","authors":"V. Reilly ,&nbsp;D. Fontaine ,&nbsp;A. Shukla","doi":"10.1016/j.jfluidstructs.2025.104377","DOIUrl":"10.1016/j.jfluidstructs.2025.104377","url":null,"abstract":"<div><div>An experimental study of the underwater collapse of shrouded cylindrical shells was conducted to mitigate the pressure pulses emitted. Each experiment involved a thin-walled metallic shroud with several small perforations placed concentric to a sealed implodable volume, which was brought to instability hydrostatically within a pressure vessel. High-speed stereo photography coupled with 3D digital image correlation (DIC) provided full-field displacement histories of the shroud during the event. High frequency response dynamic pressure transducers placed at several locations around the shroud captured emitted pressure histories. The effects of varying perforation densities and perforation orientation of shrouds on the pressure signatures emitted by the implosion of thin metallic cylindrical shells were experimentally investigated. The shrouds mitigated the emitted pressure history by up to 90%. Two regimes of shroud behavior were observed, one in which the implodable underpressure is equalized primarily by shroud wall deformation and one where equalization occurs through fluid ingression via the shroud perforations. The perforation density directly determined the contribution from both of those two mechanisms. Research is ongoing to understand the fluid-structure interaction between an imploding volume and a deformable confining shroud along with impulse mitigation optimization.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104377"},"PeriodicalIF":3.4,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of wave loads on structures floating in polynya by hybrid green function method","authors":"Yuntao Yang ,&nbsp;Junhua Zhan ,&nbsp;Chao Ma ,&nbsp;Yulong Li","doi":"10.1016/j.jfluidstructs.2025.104370","DOIUrl":"10.1016/j.jfluidstructs.2025.104370","url":null,"abstract":"<div><div>The paper demonstrates a hybrid Green function method for investigating wave loads acting on a structure floating in polynya enclosed by an ice sheet. A vertically virtual surface, stretching from the ice edge to the seabed, is designated as the control surface to divide fluid domain into two subdomains. In the interior polynya with a free surface, an upper surface condition for diffraction potential is derived, and the simple Rankine source is employed to construct boundary integro-differential equation (BIE) over free surface, body surface and control surface. On the other hand, in the exterior fluid domain beneath ice, the Green function, which inherently satisfies ice-covered water surface, radiation and seabed conditions, is adopted. So the corresponding integro-differential equation is only imposed over vertically virtual surface. Interior and exterior BIEs are discretized and solved simultaneously through implementing the continuity condition between the two subdomains. In this solution, analytical and semi-analytical schemes are utilized to determine influence coefficients related to Rankine source and ice-covered Green function. Numerical simulations are carried out for the wave loads on a submerged sphere as well as a FPSO floating in polynya, and the effects of ice thickness and water depth are analyzed. The good concordance with available published results indicates that our developed approach is reliable for investigating wave interactions with structures in polynya.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104370"},"PeriodicalIF":3.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on aerodynamic forces and aeroelasticity of an oscillating 5:1 rectangular cylinder in smooth and turbulent flow","authors":"Bo Wu ,&nbsp;Ming Li ,&nbsp;Lei Wu ,&nbsp;Huoming Shen ,&nbsp;Haili Liao ,&nbsp;Hanyu Mei","doi":"10.1016/j.jfluidstructs.2025.104371","DOIUrl":"10.1016/j.jfluidstructs.2025.104371","url":null,"abstract":"<div><div>This study examines the aerodynamic forces on an oscillating 5:1 rectangular cylinder in smooth and turbulent flow by single-degree-of-freedom (SDOF) vertical/torsional forced vibration wind tunnel tests. It quantifies the energy contributions of different components of aerodynamic forces with respect to reduced wind speed and amplitude. The critical role of turbulence in suppressing regular vortex shedding is highlighted, along with its modifying effect on fluid memory effects and aerodynamic force coefficients. The decisive role of the phase difference between self-excited-moment and torsional motion on the aeroelastic stability of an SDOF torsional conservative system is revealed. The amplitude-dependent flutter derivatives were extracted, showing significant turbulence effects and thereby notable changes in the transmission between fluid and self-excited forces. The aeroelastic response of a vertical-torsional coupled system was analyzed, revealing that turbulence-induced variations in aeroelastic stability are primarily due to changes in uncoupled aerodynamic damping. Compared to a smooth flow, the system exhibits an enhanced aeroelastic stability and smaller stable limit cycle oscillation (LCO) amplitudes within a certain wind speed range under turbulent flows. However, at high wind speeds, the response transitions to hard flutter, whereas in a smooth flow field, it generally manifests as soft flutter with stable LCO.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104371"},"PeriodicalIF":3.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study on load characteristic and icebreaking process of submerged Venturi cavitating water jets","authors":"Guangyu Yuan ,&nbsp;Xin Wang ,&nbsp;Baoyu Ni ,&nbsp;Wei Xu ,&nbsp;Di Yang ,&nbsp;Yanzhuo Xue","doi":"10.1016/j.jfluidstructs.2025.104374","DOIUrl":"10.1016/j.jfluidstructs.2025.104374","url":null,"abstract":"<div><div>This study studied the mechanism and process of ice breaking by a submerged high-pressure water jet (HPWJ) in a Venturi structure through experimental investigations. Firstly, the analysis focused on the load characteristics and flow field properties of the submerged cavitating HPWJs, including typical wall load time-history curves and characteristic phases. Furthermore, two key structural parameters of the Venturi nozzle were optimized under the parameter combination used in this study, unlike the non-submerged state, the nozzle with a throat length-to-diameter ratio of 1 and a divergence angle of 8° was the best for wall loads. Subsequently, based on the load analysis, the ice breaking process and failure modes under the combined effects of flow field disturbance pressure loads and cavitation pressure loads of the submerged HPWJ were discussed. Finally, the influence of submerged status on the ice breaking process was summarized. The research found that the submerged jets exhibited good performance during sustained icebreaking processes due to cavitation generated from Venturi throat and shear action of the submerged water jet interacting with the flow field, thus potentially serving as an auxiliary method for future subglacial structure icebreaking.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104374"},"PeriodicalIF":3.4,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wave effects on a floating, flexible and porous plate in 3D","authors":"Karl H. McGuire,&nbsp;Håvar R.L. Jacobsen,&nbsp;John Grue","doi":"10.1016/j.jfluidstructs.2025.104361","DOIUrl":"10.1016/j.jfluidstructs.2025.104361","url":null,"abstract":"<div><div>Motivated by floating solar energy production, we derive by a variational approach the equation of motion of a floating, flexible, and porous plate exposed to incoming waves. The modal representation is orthogonal and complete. The wavenumber <span><math><mi>K</mi></math></span> is up to <span><math><mrow><mi>K</mi><msub><mrow><mi>ℓ</mi></mrow><mrow><mi>x</mi></mrow></msub><mo>≤</mo><mn>30</mn></mrow></math></span> (<span><math><msub><mrow><mi>ℓ</mi></mrow><mrow><mi>x</mi></mrow></msub></math></span> the plate length). The dimensionless stiffness <span><math><mrow><mi>D</mi><mo>/</mo><mrow><mo>(</mo><mi>ρ</mi><mi>g</mi><msubsup><mrow><mi>ℓ</mi></mrow><mrow><mi>x</mi></mrow><mrow><mn>2</mn></mrow></msubsup><msubsup><mrow><mi>ℓ</mi></mrow><mrow><mi>y</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>)</mo></mrow></mrow></math></span> is in the range between <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>3</mn></mrow></msup></mrow></math></span> (small plate) and <span><math><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>7</mn></mrow></msup></mrow></math></span> (large plate) (<span><math><mi>ρ</mi></math></span> the density of the fluid, <span><math><mi>g</mi></math></span> the acceleration due to gravity, <span><math><msub><mrow><mi>ℓ</mi></mrow><mrow><mi>y</mi></mrow></msub></math></span> the lateral plate extension). The damping effect of the plate is modeled by a linear Darcy law. Even a small damping coefficient strongly reduces the plate responses. The porous dissipation depends on the flexibility of the plate. The plate-fluid system is connected with a set of integral equations for the radiation and diffraction problems using suitable Green functions in 3D and 2D. The integral equations are developed in two different versions. A set of generalized Haskind relations for the modal exciting force is developed. The damping coefficients are predicted by three different theoretical formulas obtaining convergent results. The overall energy equation is evaluated. The horizontal drift force on a damped plate is essential.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104361"},"PeriodicalIF":3.4,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144480471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Achievements of dense ESPI complex-valued full-field receptances in experiment-based Rayleigh integral approximations of sound radiation from a vibrating plate","authors":"Alessandro Zanarini","doi":"10.1016/j.jfluidstructs.2025.104340","DOIUrl":"10.1016/j.jfluidstructs.2025.104340","url":null,"abstract":"<div><div>Where can the exploitation of high spatial resolution optical full-field technologies – in <em>complex-valued</em> representation – bring, for an experiment-based extension of the Rayleigh integral approximation of sound radiation from a vibrating plate? <em>Dense receptance</em> maps may cope with the challenges of the most advanced Noise and Vibration Harshness (NVH) testing for the characterisation of the structural dynamics of the actual set-up, with damping and boundary conditions coming from the mounting and manufacturing, with all the potential delays of the responses caught around the superposition of a modally dense dynamics, but without the need of a Finite Element Model (FEM), especially in the case of lightweight structures. Sound radiations are explored in the <em>complex-valued</em> details of <em>vibro-acoustic transfer functions</em> and of <em>pressure</em> fields, by feeding the well-known Rayleigh formulation with Electronic Speckle Pattern Interferometry (ESPI)-based <em>receptances</em>, obtained from a simple thin rectangular plate, designed as a lightweight structure with a complex structural dynamics, its real constraints and damping characteristics. The contribution of <em>dense</em> experiment-based full-field <em>receptances</em> to the radiated sound fields at different distances is discussed in a broad frequency domain.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104340"},"PeriodicalIF":3.4,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A penalization-based strong partitioned coupling with application to cavitation-induced damage","authors":"L. Ménez ,&nbsp;M. Beringhier ,&nbsp;P. Parnaudeau ,&nbsp;E. Goncalves","doi":"10.1016/j.jfluidstructs.2025.104364","DOIUrl":"10.1016/j.jfluidstructs.2025.104364","url":null,"abstract":"<div><div>A novel strong partitioned coupling strategy is developed in order to address Fluid–Structure Interaction (FSI) problems. The Brinkman penalization method is adopted to model the deformable fluid–solid interface on a fixed Cartesian grid. Originally designed for single-phase flows and rigid bodies, the penalization method is extended to compressible multiphase flows and deformable walls. This numerical model is applied to the analysis of cavitation-induced damage at the microscopic scale, focusing on the shock-induced collapse of a single bubble near an elastoplastic material. We examine the effect of initial bubble–wall distance on wall pressure, material damage and permanent wall deformation (i.e., cavitation pit). This parametric study is conducted for different material yield strengths. Both pit depth and area increase rapidly as the bubble–wall distance and yield strength decrease. Whereas closer bubbles generate a deep, circular pit, more distant bubbles can produce a shallower, annular pit. The effect of FSI coupling is thoroughly analyzed across all parametric configurations. Wall deformation results in the damping of wall pressure, leading to differences in material damage between weakly and strongly coupled simulations. At the moment of impact, the damping of wall pressure is initially governed by the ratio of the acoustic impedances of the fluid and solid media. It is then further amplified locally by plasticity or, more generally, in regions of higher deformation. A small reduction in wall pressure leads to a much more significant damping in both pit depth and pit area. While the decrease in wall pressure is locally affected by material deformation, the change in pit size remains approximately constant for all configurations.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104364"},"PeriodicalIF":3.4,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation of flow around the legs during walking in water with implications for hydrotherapeutic exercise","authors":"Umang N. Patel,&nbsp;Frank C. Sup IV,&nbsp;Yahya Modarres-Sadeghi","doi":"10.1016/j.jfluidstructs.2025.104352","DOIUrl":"10.1016/j.jfluidstructs.2025.104352","url":null,"abstract":"<div><div>One of the common hydrotherapeutic exercises is walking in water because buoyancy reduces joint loading and increases mobility for a patient. The fluid drag forces (the forces that act on the person from the fluid in the direction opposing the direction of motion) cause changes in muscle activations, as walking in water changes the forces that act on the leg compared with overground walking. Here, through a series of numerical simulations, we quantify how the flow forces that act on the leg due to its motion in water change over a walking gait cycle. We show that besides drag forces that act on the walking legs and peak when the leg is accelerated forward, relatively large lateral forces (in the direction perpendicular to the direction of motion) also act on the leg. These forces are caused by the rapid acceleration of the opposite leg when the two legs are close, creating an asymmetric pressure distribution around the leg. These results are unexpected and could have significant implications for designing hydrotherapeutic plans for patients by considering the lateral forces besides the drag forces that act on the body while walking in water.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104352"},"PeriodicalIF":3.4,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An adaptive time integration approach for aeroelastic simulations using the unsteady vortex-lattice method and geometrically exact beams","authors":"David Märtins ,&nbsp;Daniel Schuster ,&nbsp;Christian Hente ,&nbsp;Helge Jauken ,&nbsp;Cristian Guillermo Gebhardt ,&nbsp;Raimund Rolfes","doi":"10.1016/j.jfluidstructs.2025.104360","DOIUrl":"10.1016/j.jfluidstructs.2025.104360","url":null,"abstract":"<div><div>In the context of aeroelastic simulations, the unsteady vortex-lattice method, strongly coupled with geometrically exact beams, represents a good balance between computational cost and accuracy. However, the computation of aerodynamic loads can still be very time-consuming. To reduce the wall time of aeroelastic computations using the unsteady vortex-lattice method and geometrically exact beams, we strive for a technique to reduce the number of time steps necessary to simulate a given physical time. This paper presents an approach to calculate and adapt the time step size, which can significantly reduce the total computation time without compromising the accuracy of the result. In order to achieve this, the time step size is adapted following the evolution of relevant physical quantities describing the system (ring circulations, aerodynamic forces, potential energy, kinetic energy). Limits for the minimum and maximum time step sizes are introduced by monitoring the geometry of the wake elements. This straightforward approach can easily be adapted to other aeroelastic frameworks using the unsteady vortex-lattice method. The high potential for computational acceleration is demonstrated in the application example of a NACA wing, the benchmark of the Pazy wing, and the NREL 5 MW reference wind turbine.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104360"},"PeriodicalIF":3.4,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}