Journal of Fluids and Structures最新文献

Numerical analysis of vortex-induced vibration of deep-sea mining riser with auxiliary pipes based on discrete vortex method 基于离散涡法的深海矿用辅助管立管涡激振动数值分析

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-10-03 DOI: 10.1016/j.jfluidstructs.2025.104431

Guangrui Zhang, Yanbin Wang, Deli Gao

{"title":"Numerical analysis of vortex-induced vibration of deep-sea mining riser with auxiliary pipes based on discrete vortex method","authors":"Guangrui Zhang, Yanbin Wang, Deli Gao","doi":"10.1016/j.jfluidstructs.2025.104431","DOIUrl":"10.1016/j.jfluidstructs.2025.104431","url":null,"abstract":"<div><div>Air injection and discharge pipes play an essential role in the deep-sea mining airlift process, and their influence on the flow field and riser vortex-induced vibration (VIV) is not fully investigated. In this study, the discrete vortex method is modified to incorporate the influence of multiple solid domains, and the flow field evolution in the presence of auxiliary pipes is simulated. Based on the assumption that the vortex structure is constant within a certain spanwise length, an analytical model is established by strip theory and a weakly coupled fluid-structure interaction approach to investigate riser VIV in the cross-flow direction. The results show that the auxiliary pipes will interfere with the vortex shedding of the main riser and inhibit the formation of a stable wake pattern, which leads to a reduction in both the amplitude and frequency of the lift force. The VIV exhibits a mixed behavior of standing and travelling waves, and multi-mode responses induced by temporal drift of the frequency can be observed. In addition, the auxiliary pipes suppress the VIV by disturbing vortex shedding and increasing the bending stiffness of the riser. Moreover, the effects of inflow angle, current velocity, and vessel navigational motion on the VIV response and power region distribution are investigated. Specifically, a 45° inflow angle provides optimal VIV suppression and leads to the narrowest power-in region, while vessel motion in either the upstream or downstream direction aggravates VIV and significantly alters the power region distribution.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104431"},"PeriodicalIF":3.5,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221834","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}

引用次数: 0

Higher resonances improve the swimming performance of flexible bio-inspired propulsors 更高的共振提高了柔性仿生推进器的游泳性能

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-10-03 DOI: 10.1016/j.jfluidstructs.2025.104433

Patrick F. Musgrave , Charles M. Tenney

{"title":"Higher resonances improve the swimming performance of flexible bio-inspired propulsors","authors":"Patrick F. Musgrave , Charles M. Tenney","doi":"10.1016/j.jfluidstructs.2025.104433","DOIUrl":"10.1016/j.jfluidstructs.2025.104433","url":null,"abstract":"<div><div>This study establishes the role of higher resonant frequencies on the swimming performance of flexible bio-inspired propulsors. Biological and bio-inspired swimmers typically swim at or near their first resonance to achieve high efficiency and thrust. These swimmers also have higher resonances that could yield the same performance benefits; however, the role of these higher resonances is not well understood. This study experimentally identifies the thrust, kinematics, and power performance of flexible propulsors across resonances and uncovers the fluid-structural mechanism that governs the performance. We experimentally test multiple propulsors that share a simplified design consisting of a constant cross-section beam excited by piezoelectric actuators in quiescent water and with stiffnesses in the range of biological swimmers. Our results demonstrate that higher resonances significantly improve the performance compared to the fundamental resonance yielding a <span><math><mrow><mn>2</mn><mo>×</mo></mrow></math></span> increase in thrust to power ratio, up to <span><math><mrow><mn>11</mn><mo>×</mo></mrow></math></span> increase in absolute thrust, while requiring <span><math><mrow><mo><</mo><mn>25</mn><mtext>%</mtext></mrow></math></span> of the displacement amplitude.</div><div>While the higher resonances yield better overall performance, we show that higher resonances are less effective at converting tail velocity into thrust since the thrust coefficient depends on the mode shape. We determine that higher resonances engage less fluid mass, and show that the effective aspect ratio (wavelength normalized by width) is a predictor of performance across resonances. These results indicate that higher resonances could be a viable swimming option to improve the thrust and efficiency of stiffer bodied swimmers while yielding smaller displacement amplitudes that improve operation near obstacles.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104433"},"PeriodicalIF":3.5,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221832","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}

引用次数: 0

Experimental investigation of torsional effects on cross-flow oscillations in flow-induced vibrations of a triangular prism 三角棱镜流激振动中扭转效应对横流振荡的实验研究

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-10-01 DOI: 10.1016/j.jfluidstructs.2025.104428

Seyedmohammad Mousavisani, Farnaz Feyli, Banafsheh Seyed-Aghazadeh

{"title":"Experimental investigation of torsional effects on cross-flow oscillations in flow-induced vibrations of a triangular prism","authors":"Seyedmohammad Mousavisani, Farnaz Feyli, Banafsheh Seyed-Aghazadeh","doi":"10.1016/j.jfluidstructs.2025.104428","DOIUrl":"10.1016/j.jfluidstructs.2025.104428","url":null,"abstract":"<div><div>This study experimentally investigates the flow-induced vibration (FIV) response of a rigid equilateral triangular prism with one and two degrees of freedom (DoF). The primary focus is on assessing how introducing rotational oscillations (a second DoF) influences cross-flow (CF) oscillations (the first DoF) through a series of water tunnel experiments. The system’s dynamic response is characterized at five initial angles of attack (<span><math><mrow><mi>α</mi><mo>=</mo><mn>0</mn><mo>°</mo><mo>,</mo><mn>15</mn><mo>°</mo><mo>,</mo><mn>30</mn><mo>°</mo><mo>,</mo><mn>45</mn><mo>°</mo><mo>,</mo><mn>60</mn><mo>°</mo></mrow></math></span>), within a Reynolds number range of 525 to 3,817. For the one-DoF configuration in the CF direction, a galloping-type instability is observed at <span><math><mrow><mi>α</mi><mo>=</mo><mn>45</mn><mo>°</mo></mrow></math></span> and <span><math><mrow><mn>60</mn><mo>°</mo></mrow></math></span>. However, when torsional motion is introduced as a second DoF, the onset of oscillations is delayed, and the amplitude of CF oscillations is significantly reduced. This suppression is attributed to changes in the mean angle of attack and the influence of periodic rotational oscillations. The periodic prism rotation modifies the flow-afterbody interaction, leading to weakened flow forces in the CF direction and further reducing the vibration amplitude. Particle Image Velocimetry (PIV) measurements reveal notable differences in the wake structures between the one- and two-DoF cases. In the two-DoF configuration, the prism’s rotation shifts the separation points, leading to asymmetric vortex shedding between the upper and lower sides. This asymmetry periodically modulates the wake dynamics and sustains the rotational oscillations of the prism.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104428"},"PeriodicalIF":3.5,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222497","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}

引用次数: 0

Three-dimensional fluid–structure interaction diagnostics using a single camera 利用单摄像机进行三维流固相互作用诊断

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-10-01 DOI: 10.1016/j.jfluidstructs.2025.104423

Bibek Sapkota, Holger Mettelsiefen, Vrishank Raghav, Brian S. Thurow

{"title":"Three-dimensional fluid–structure interaction diagnostics using a single camera","authors":"Bibek Sapkota, Holger Mettelsiefen, Vrishank Raghav, Brian S. Thurow","doi":"10.1016/j.jfluidstructs.2025.104423","DOIUrl":"10.1016/j.jfluidstructs.2025.104423","url":null,"abstract":"<div><div>A new method for fluid–structure interaction (FSI) diagnostics to simultaneously capture time-resolved three-dimensional, three-component (3D3C) velocity fields and structural deformations using a single light field camera is presented. A light field camera encodes both spatial and angular information of light rays collected by a conventional imaging lens that allows for the 3D reconstruction of a scene from a single image. Building upon this capability, a light field fluid–structure interaction (LF FSI) methodology is developed with a focus on experimental scenarios with low optical access. Proper orthogonal decomposition (POD) is used to separate particle and surface information contained in the same image. A correlation-based depth estimation technique is introduced to reconstruct instantaneous surface positions from the disparity between angular perspectives and conventional particle image velocimetry (PIV) is used for flow field reconstruction. Validation of the methodology is achieved using synthetic images of simultaneously moving flat plates and a vortex ring with a small increase in uncertainty under <span><math><mo>∼</mo></math></span> 0.5 microlenses observed in both flow and structure measurement compared to independent measurements. The method is experimentally verified using a flat plate translating along the camera’s optical axis in a flow field with varying particle concentrations. Finally, simultaneous reconstructions of the flow field and surface shape around a flexible membrane are presented, with the surface reconstruction further validated using simultaneously captured stereo images. The findings indicate that the LF FSI methodology provides a new capability to simultaneously measure large-scale flow characteristics and structural deformations using a single camera.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104423"},"PeriodicalIF":3.5,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221833","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}

引用次数: 0

Analytical solutions for the flexural–gravity and capillary–gravity wave resistances due to a steadily moving concentrated load 稳定移动集中荷载下挠曲重力波和毛细重力波阻力的解析解

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-09-30 DOI: 10.1016/j.jfluidstructs.2025.104430

D.Q. Lu

{"title":"Analytical solutions for the flexural–gravity and capillary–gravity wave resistances due to a steadily moving concentrated load","authors":"D.Q. Lu","doi":"10.1016/j.jfluidstructs.2025.104430","DOIUrl":"10.1016/j.jfluidstructs.2025.104430","url":null,"abstract":"<div><div>The interfacial flexural–gravity waves due to a concentrated load steadily moving on the thin elastic plate floating on the interface between two immiscible fluids of different densities are investigated analytically. The two inviscid fluids are assumed to be incompressible and homogeneous, and the motion be irrotational. The equation of motion for the plate, including the elastic force, the compressive force and the inertial force, is imbedded in the dynamic boundary conditions on the interface. Based on the linear potential theory for small-amplitude waves, the integral solutions for the interfacial wave profiles and wave resistances are derived by the Fourier transform. The dispersion relation and the exact solutions for the wave numbers are explicitly deduced. It is found the wave dynamical behaviors depend on the relation between the moving speed and the minimal phase speed. The maximal allowable value for the compressive force is obtained, at which the minimal phase speed is zero and the wave motion can be stimulated with any nonzero moving speed of the load due to the presence of compressive stress in the plate. The effects of the flexural rigidity and the fluid density ratio are also explored. The solutions for the capillary–gravity wave can readily be recovered by discarding the elastic force in the present formulation.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104430"},"PeriodicalIF":3.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222498","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}

引用次数: 0

Stably biased gap flow between two flapping and stationary short cantilevers in close proximity 两个拍动和固定短悬臂梁之间的稳定偏置间隙流

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-09-29 DOI: 10.1016/j.jfluidstructs.2025.104432

Yongpu Wang , Yanyan Liu , Michael David Atkins , Tian Jian Lu , Tongbeum Kim

{"title":"Stably biased gap flow between two flapping and stationary short cantilevers in close proximity","authors":"Yongpu Wang , Yanyan Liu , Michael David Atkins , Tian Jian Lu , Tongbeum Kim","doi":"10.1016/j.jfluidstructs.2025.104432","DOIUrl":"10.1016/j.jfluidstructs.2025.104432","url":null,"abstract":"<div><div>Contrary to previously known physics about fluid motion around two side-by-side circular cylinders, this study has demonstrated stably biased gap flow when excited by a flapping and stationary cantilever pair - the gap flow is only deflected towards the flapping cantilever (without switching). Mechanisms for this behavior were presented in this study. To this end, flow visualization and spectral analysis of time-resolved data from hot-wire anemometers and the piezoelectric mount of a flapping cantilever were carried out. Furthermore, particle image velocimetry was conducted to map instantaneous and time-averaged velocity and vorticity fields. During measurements, a center-to-center spacing normalized by cantilever diameter (T/D, pitch ratio) was systematically varied in the Reynolds number range of 1800 ≤ Re<sub>D</sub> ≤ 13,000. We demonstrated that the Kelvin-Helmholtz (K-H) instability of shear layers separated from the flappable cantilever was intensified due to flapping, consequently inciting the earlier onset of Kármán vortices (evolved from K-H vortices) than those behind the stationary cantilever. Thereafter, an earlier velocity recovery developed, generating a transverse pressure gradient towards the flapping cantilever and subsequent upstream penetration (i.e., potential effect). The gap flow then became stably pushed towards the flapping cantilever.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104432"},"PeriodicalIF":3.5,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222495","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}

引用次数: 0

On the oscillatory behavior of two pendulum-like tandem circular slender cylinders 两个类摆串联细长圆柱的振动特性研究

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-09-29 DOI: 10.1016/j.jfluidstructs.2025.104424

Patrick Batista Habowski , Sergio Viçosa Möller , Adriane Prisco Petry , Atef Mohany

{"title":"On the oscillatory behavior of two pendulum-like tandem circular slender cylinders","authors":"Patrick Batista Habowski , Sergio Viçosa Möller , Adriane Prisco Petry , Atef Mohany","doi":"10.1016/j.jfluidstructs.2025.104424","DOIUrl":"10.1016/j.jfluidstructs.2025.104424","url":null,"abstract":"<div><div>This experimental study investigates the flow–structure interaction of two identical tandem slender cylinders subjected to cross-flow in a wind tunnel. The upstream and downstream cylinders were mounted in a pendulum-like configuration, allowing only transverse oscillation with matching natural frequencies, and were also tested in a fixed configuration for comparison purposes. All experiments were performed at spacing ratios ranging from 2.0 to 7.5, within a Reynolds number range of 16,000 to 22,000. Lateral displacements were recorded using a high-speed camera, and flow structures were analyzed using Particle Image Velocimetry (PIV). The primary objective was to correlate the observed flow dynamics from the PIV results with the oscillatory behavior of the cylinders. The results show that oscillations occurred for all investigated spacing ratios, with the most significant oscillations observed at a spacing ratio of 2.0 and a distinctive pattern with extreme amplitudes at a spacing ratio of 3.5. Cross-correlation of the Discrete Wavelet Transform of the vibration response reveals that the vibration of the downstream cylinder are influenced by the wake of the upstream cylinder, with its amplitude remaining enveloped within the wake of the upstream cylinder. The flow structure driving the oscillatory behavior indicates that the vibrations of the cylinders are predominantly governed by wake-induced vibration, except for the case of <span><math><mrow><mi>L</mi><mo>/</mo><mi>D</mi><mo>=</mo><mn>3</mn><mo>.</mo><mn>5</mn></mrow></math></span>, where a galloping-like instability was observed—a mechanism not previously reported for this configuration. The phenomenon described in this paper presents potential opportunity for energy harvesting applications.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104424"},"PeriodicalIF":3.5,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222496","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}

引用次数: 0

Study on the high-speed shallow-angle water entry of cylinders with varying densities 变密度圆柱高速浅角入水研究

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-09-27 DOI: 10.1016/j.jfluidstructs.2025.104429

Xuepu Yan , Shuai Sun , Mo Zhu , Tengfei Xu , Pengfei Liu , Zeqing Guo

{"title":"Study on the high-speed shallow-angle water entry of cylinders with varying densities","authors":"Xuepu Yan , Shuai Sun , Mo Zhu , Tengfei Xu , Pengfei Liu , Zeqing Guo","doi":"10.1016/j.jfluidstructs.2025.104429","DOIUrl":"10.1016/j.jfluidstructs.2025.104429","url":null,"abstract":"<div><div>An investigation into the transient fluid-structure interactions during the high-speed (600 m/s) shallow-angle (8°) water entry of cylindrical projectiles with varying densities (2.7-16.1 g/cm³) is presented. The fundamental mechanisms governing cavity dynamics and projectile stability are revealed using three-dimensional computational fluid dynamics (CFD) simulations, which are validated by synchronized high-speed imaging. The key findings demonstrate that asymmetric wetting of the cylinder’s head during the early stage of water entry induces a critical head-down moment that governs subsequent hydrodynamic behavior. Three distinct fluid dynamic mechanisms are identified: 1) Delayed upper cavity formation accompanied by asymmetric cavity expansion; 2) Splash convergence producing distinct upward and downward jets, with the latter inducing localized cavity collapse upon impacting the wall; and 3) Pressure redistribution at the head end caused by variations in angle of attack, which generates restoring moments through asymmetric flow patterns. Density-dependent kinematic analysis reveals that within the same range of horizontal displacement, low-density cylinders (<em>ρ</em>≤4.1 g/cm³) undergo multiple tail slaps, whereas high-density cylinders (<em>ρ</em>≥7.2 g/cm³) achieve rotational stabilization through head-end restoring moments prior to tail slap initiation. Quantitative analysis shows that increasing the density from 2.7 to 16.1 g/cm³ reduces the maximum angular deflection by 89.43 % and the accumulated trajectory curvature by 42.83 %. These findings establish material density as the primary control parameter for ricochet prevention during shallow-angle water entry.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104429"},"PeriodicalIF":3.5,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221835","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}

引用次数: 0

A low-cost morphing vehicle design for enhanced aerodynamic performance 一种低成本的可变形飞行器设计，增强了气动性能

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-09-25 DOI: 10.1016/j.jfluidstructs.2025.104422

Sina Kazemipour, Peng Zhang

{"title":"A low-cost morphing vehicle design for enhanced aerodynamic performance","authors":"Sina Kazemipour, Peng Zhang","doi":"10.1016/j.jfluidstructs.2025.104422","DOIUrl":"10.1016/j.jfluidstructs.2025.104422","url":null,"abstract":"<div><div>Mid- and large-size road vehicles are responsible for high levels of green-house gas emissions, due to their poor aerodynamic designs. To alleviate this environmental and health risk, we propose a low-cost, noninvasive morphing vehicle design toward improved aerodynamic efficiency and reduced emissions. Using a generic pickup truck as the base geometry, morphing is accomplished by retrofitting a flexible structure over its cargo bed region, enabling active deformation and interaction with the airflow. The shape morphing process is optimized through a combined parametric genetic algorithm – computational fluid dynamics framework, enabling continuous morphing across a range of driving speeds. The optimal structural shapes lead to a reduction in the aerodynamic drag force between 8.7% and 10.1%. Analysis of the airflow physics reveals that the morphing structure compresses the size of the circulation bubble and reduces the strength of the counter-rotating flow structures in the wake, resulting in increased wake pressure and decreased drag force. Remarkably, the morphing structure not only reduces the drag on the base vehicle geometry but also elicits a negative drag force on itself. This non-invasive morphing vehicle design concept could transform the automotive industry by enhancing fuel economy and reducing emissions for existing vehicle models.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104422"},"PeriodicalIF":3.5,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159583","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}

引用次数: 0

Hydrodynamic behavior of an offshore OWC power station under dam-break flows: Numerical and experimental study 溃坝水流作用下近海OWC电站的水动力特性：数值与试验研究

IF 3.5 2区工程技术

Journal of Fluids and Structures Pub Date : 2025-09-25 DOI: 10.1016/j.jfluidstructs.2025.104426

Shiqi Pan , Haochen Zhang , Jing Geng , Xuanlie Zhao

{"title":"Hydrodynamic behavior of an offshore OWC power station under dam-break flows: Numerical and experimental study","authors":"Shiqi Pan , Haochen Zhang , Jing Geng , Xuanlie Zhao","doi":"10.1016/j.jfluidstructs.2025.104426","DOIUrl":"10.1016/j.jfluidstructs.2025.104426","url":null,"abstract":"<div><div>The hydrodynamic behavior of a three-dimensional oscillating water column (OWC) device subjected to dam-break flow incidents was investigated using numerical and experimental methods. Load characteristics and flow field distributions were analyzed under various opening ratios of the air chamber and angles of incident flow. Numerical results were validated against experimental measurements of impact loads and water surface elevation at a 45° incident angle, and extended to six additional incident angles: 0°, 15°, 30°, 60°, 75°, and 90°. The peak impact load and air chamber pressure occurred at 90°, both decreasing as the incident angle varied to 0°. The peak horizontal resultant force decreased by 43.4 %, 55.3 %, and 65.9 % at 60°, 45°, and 30°, respectively, while peak air pressure decreased by up to 68 % at 0°. Loads on internal and external walls were of similar magnitudes, highlighting the importance of considering internal wall forces in structural design. Flow field analysis revealed complex flow contours and an inclined water surface inside the chamber, which became more pronounced as the incident angle decreased. Moreover, increasing the opening ratio of the air chamber significantly reduced peak impact loads and air pressure, especially in the range of 0 % to 3.5 %. However, larger opening ratios may reduce energy capture efficiency. Thus, selecting an appropriate opening ratio that balances load reduction with energy capture efficiency is crucial for OWC design.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"139 ","pages":"Article 104426"},"PeriodicalIF":3.5,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159582","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}

引用次数: 0