Journal of Fluids and Structures最新文献

{"title":"Numerical modeling of fluid-structure interactions by using a hybrid method of IB-LBM and ANCF","authors":"Yifan Qin,&nbsp;Qiang Tian,&nbsp;Minghe Shan,&nbsp;Haiyan Hu","doi":"10.1016/j.jfluidstructs.2025.104378","DOIUrl":"10.1016/j.jfluidstructs.2025.104378","url":null,"abstract":"<div><div>The study on coupling dynamics of flexible multibody-fluid interactions is of paramount importance for the design of aircraft, flying biomimetic systems and underwater soft robots. This paper presents a novel computational methodology for simulating flexible multibody-fluid interactions. The methodology combines the lattice Boltzmann method to model fluid dynamics and the absolute nodal coordinate formulation to describe flexible multibody systems. Then, it uses the immersed boundary method to simulate moving and deforming boundaries within fluid flows. The innovation of the methodology lies in two aspects. First, the shear-improved Smagorisky model is introduced into the flexible multibody-fluid coupling to efficiently capture turbulent flows under large motions and significant rotations. Second, a structural predictor is used to effectively reduce the interaction time-lag problems so as to assure the consistency of dynamic responses and energy conservation at the interface. The proposed methodology is validated through three classical benchmarks first, and then the fluttering dynamics of a flexible biomimetic butterfly in air is simulated. All numerical simulations demonstrate that the new methodology can effectively address the complex coupling dynamics of flexible multibody-fluid systems.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104378"},"PeriodicalIF":3.4,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596366","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":"Correlating the Den Hartog instability criterion to the dynamic response of an oscillating system in elevated free-stream turbulence","authors":"Kai He,&nbsp;Arindam Banerjee","doi":"10.1016/j.jfluidstructs.2025.104375","DOIUrl":"10.1016/j.jfluidstructs.2025.104375","url":null,"abstract":"<div><div>The Den Hartog criterion has been used to evaluate the susceptibility of a cross-section to galloping instability. We present results from novel experiments aimed at correlating the Den Hartog stability assessment of an altered circular cross-section and the dynamic response of a 1D self-excited oscillator in an inflow with elevated free-stream turbulence levels, with turbulence intensities of 13.4 % and 19.4 %. The results were compared with a quasi-laminar inflow case with a background turbulence intensity of &lt; 2 %. Dynamic tests were performed on a circular cylinder with attached strips of various thicknesses, from 0 – 8.2 % of the cylinder diameter. The Reynolds number range for the reported experiments was 1800 – 31900 across both inflow conditions. Both sets of results are compared with static tests involving thicknesses varying from 0 to 12.8 % at Reynolds numbers from 10000 to 30000. The maximum angles of attack of the vibrating configurations were projected onto the Den Hartog instability map generated from fixed cylinder lift‒drag measurements, and the maximum angle experienced by the cylinder that underwent galloping fell within the Den Hartog instability zones. Increasing the strip thickness postpones the angle at which the lift reaches its maximum and increases the maximum lift and drag values. The effects of elevated turbulence on the Den Hartog criteria are evaluated, and the results suggest that inflow turbulence eliminates the galloping instability branch close to 90°. Free-stream turbulence also reduces the vortex shedding frequency and eliminates the abrupt changes in lift observed in the laminar inflow cases.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104375"},"PeriodicalIF":3.4,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580368","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":"Tornado-induced wind loads on a community of low-rise buildings","authors":"Ruijia Yang ,&nbsp;Djordje Romanic ,&nbsp;Horia Hangan","doi":"10.1016/j.jfluidstructs.2025.104369","DOIUrl":"10.1016/j.jfluidstructs.2025.104369","url":null,"abstract":"<div><div>An innovative wind chamber study on wind loads induced by tornado-like vortices (TLVs) on a realistic, geometrically complex built community is performed at the WindEEE Dome tornado simulator at Western University, Canada. The pressure distribution induced by the TLVs on the model buildings are quantified and compared to ASCE 7-22 building provisions, revealing that the building code may sometimes be insufficient for side loads, uplift, and appurtenance loads. For each geometric configuration of the community, stationary TLVs with swirl ratio values of <span><math><mrow><mi>S</mi><mo>=</mo></mrow></math></span> 0.59, 0.69 and 1.03 are simulated. Flow aerodynamics are assessed by analyzing time-averaged and instantaneous pressure coefficients. The spatial location of pressure minima conform to pressure distribution observed from flow separation, with the roof experiencing the highest pressure deficits. Instantaneous pressures were subjected to extreme value analyses, which identified short return period pressure coefficients for strong pressure deficits.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"137 ","pages":"Article 104369"},"PeriodicalIF":3.4,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571775","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":"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}