Journal of Fluids and Structures最新文献

{"title":"An interpolation-bounce-immersed boundary lattice Boltzmann method for fluid-structure-acoustic simulation applied to elastic airfoil trailing edge","authors":"Wen-zhi Liang ,&nbsp;Pei-qing Liu ,&nbsp;Jin Zhang ,&nbsp;Qiu-lin Qu","doi":"10.1016/j.jfluidstructs.2025.104324","DOIUrl":"10.1016/j.jfluidstructs.2025.104324","url":null,"abstract":"<div><div>This paper presents a direct numerical simulation of fluid-structure-acoustic multi-physics coupling for an airfoil with an elastic trailing edge at the intermediate to high Reynolds numbers using the lattice Boltzmann method (LBM). When dealing with a moving boundary, a modified immersed boundary method (IBM) based on velocity correction and incorporating interpolated bounce back (IBB) is proposed. This method aims to capture the small pressure perturbations caused by solid vibrations through high-precision IBM for acoustic calculations at high Reynolds numbers. The method was validated by cantilever and NACA0012 airfoil cases, demonstrating its ability to simulate fluid-structure-acoustic coupling. A comparison between elastic trailing edge noise results with different elastic moduli and rigid trailing edge noise showed a decrease in low-frequency discrete tonal noise and an increase in high-frequency broadband noise, confirming the effectiveness of the method in simulating noise reduction with elastic trailing edges. Frequency domain analysis of the acoustic field results was conducted using DMD, confirming the physical nature of small perturbation waves, explaining the noise reduction mechanism, and validating the accuracy of the method in simulating small perturbation waves with elastic trailing edges.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104324"},"PeriodicalIF":3.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844874","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":"Probability evaluation of blade flutter in a transonic compressor with inlet distortion using SSA-DBEN model","authors":"Jingshan Wei,&nbsp;Zhidong Chi,&nbsp;Shimin Wang,&nbsp;Qun Zheng,&nbsp;Wei Yan,&nbsp;Bin Jiang","doi":"10.1016/j.jfluidstructs.2025.104318","DOIUrl":"10.1016/j.jfluidstructs.2025.104318","url":null,"abstract":"<div><div>Inlet distortion significantly impacts the aeroelastic stability of aircraft engines, posing potential risks to their reliability and performance. Evaluating the probability of flutter in compressor blades is an effective approach to quantifying uncertain vibration characteristics and assessing blade aeroelastic stability. To improve modeling accuracy and computational efficiency in this analysis, a prediction method based on the sparrow search algorithm -deep extreme belief network (SSA-DEBN) model is proposed. The proposed method is evaluated through a case study involving the flutter probability assessment of a typical compressor rotor under inlet total pressure distortion. The results demonstrate that the aerodynamic modal damping ratio initially decreases and then increases as the wavelength of the inlet distortion decreases, reaching a minimum when the sinusoidal wave number of the distortion is two. Under inlet distortion conditions, the aerodynamic modal damping ratio of the compressor blade follows an approximate normal distribution, with a flutter reliability of 98.48 %. The primary factors influencing compressor blade flutter are rotational speed, inlet total temperature, vibration frequency, inlet total pressure, outlet static pressure, and distortion amplitude. The SSA-DEBN method has high accuracy and efficiency in the evaluation of compressor blade flutter failure mode by comparative analysis.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104318"},"PeriodicalIF":3.4,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829387","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 dynamic characteristics of coupled sloshing system with a movable baffle","authors":"Chenyi Wang ,&nbsp;Changfang Zou ,&nbsp;Xiaonan Yuan ,&nbsp;Quanming Miao ,&nbsp;Guijie Shi","doi":"10.1016/j.jfluidstructs.2025.104320","DOIUrl":"10.1016/j.jfluidstructs.2025.104320","url":null,"abstract":"<div><div>A fluid-structure coupling mechanical model of liquid sloshing in the tank with the movable baffle is presented in this paper. The movable baffle is linked to the side walls by springs and dampers and can only move along the width direction of the tank in the bottom. The model is established using Finite Element Method (FEM) and Finite Volume Method (FVM). To investigate the dynamic characteristics of the coupled system of fluid-baffle-tank, the numerical decay tests and sweep tests are conducted, the modal frequencies and shapes of different coupled system are also studied. The results reveal that spring stiffness plays a crucial role in the coupled system and the damper can enhance the anti-sloshing effect of the movable baffle in the tank. The added mass of the baffle is much greater than the baffle mass, and it is the main factor affecting the modal frequencies and dynamic response of the coupled system.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104320"},"PeriodicalIF":3.4,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143816358","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":"Hydrodynamic interaction between 2D square cylinders in oscillatory, large-amplitude flow","authors":"Trygve Kristiansen,&nbsp;Senthuran Ravinthrakumar","doi":"10.1016/j.jfluidstructs.2025.104312","DOIUrl":"10.1016/j.jfluidstructs.2025.104312","url":null,"abstract":"<div><div>We study hydrodynamic interaction effects on the in-line and cross-flow loads on two fixed, square, two-dimensional cylinders in infinite fluid subjected to oscillatory flow at high Keulegan–Carpenter (<span><math><mtext>KC</mtext></math></span>) numbers (<span><math><mrow><mtext>KC</mtext><mo>=</mo><mn>5</mn><mo>−</mo><mn>24</mn></mrow></math></span>). The cylinder cross-sections are quadratic with both sharp and rounded corners. Both experiments and numerical simulations are carried out. The numerical simulations cover side-by-side, tandem and a range of staggered configurations. The experiments cover only tandem configurations, to which the CFD results agree well. The effect of rounding the corners and the two cylinders’ orientation relative to each other (facing each other, or facing the flow) are studied. The relative orientation is shown to matter significantly, while the rounding of the corners more moderately, although the loads are notably reduced. The drag, lift and inertia coefficients are presented and discussed in detail, and there is in general hydrodynamic interaction effects as expected and reported earlier in the literature. More notably, however, there are important <span><math><mrow><mn>2</mn><mi>ω</mi><mo>−</mo></mrow></math></span>load components due to hydrodynamic interaction, both in-line and cross-flow, but most pronounced in the cross-flow direction (<span><math><mi>ω</mi></math></span> is the frequency of oscillation). The <span><math><mrow><mn>2</mn><mi>ω</mi></mrow></math></span> cross-flow loads are more sensitive to the cylinder orientation relative to the flow than the in-line loads.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104312"},"PeriodicalIF":3.4,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807131","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 robust low-dissipation Riemann-SPH solver with a novel hybrid boundary treatment method for FSI problems","authors":"Xiangdong Liu ,&nbsp;Yang Yang ,&nbsp;Qiuzu Yang ,&nbsp;Fei Xu","doi":"10.1016/j.jfluidstructs.2025.104316","DOIUrl":"10.1016/j.jfluidstructs.2025.104316","url":null,"abstract":"<div><div>Smoothed Particle Hydrodynamics (SPH) method is currently widely used to simulate fluid-structure interaction (FSI) problems, however, challenges such like the particle penetration, fluid tensile instability (TI) problems still arise near the fluid-structure interfaces using the SPH method. In this paper, a highly robust SPH solution method without any empirical parameters and numerical noise was proposed. The coupled normal flux and fixed dummy particle boundary treatment method was chosen to impose the boundary conditions, and an enhanced Riemann SPH solver was introduced to smooth transitions of field variables near the interface. Robustness and accuracy of the proposed method were validated through three typical FSI cases, including water entry of the 2D cylinder, sinking of an eccentric rigid box and water entry of a wedge. Results indicate a high degree of consistency between the present results and reference results. Given that only a single layer of particles needs to be set when using this SPH solution method to discretize structures, the present SPH solution method is suitable for simulating FSI problems with sharp corners or complex geometries and shows promising applications.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104316"},"PeriodicalIF":3.4,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800476","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":"Tunable covert-inspired flow control: An experimental and model-based investigation","authors":"Ahmed K. Othman,&nbsp;Girguis Sedky,&nbsp;Aimy Wissa","doi":"10.1016/j.jfluidstructs.2025.104315","DOIUrl":"10.1016/j.jfluidstructs.2025.104315","url":null,"abstract":"<div><div>Bird upperwing coverts are contour feathers observed to passively deploy during high angle of attack maneuvers. This study investigates the dynamics of passive covert-inspired torsionally hinged flaps at <span><math><mrow><mi>R</mi><mi>e</mi><mo>=</mo><mn>200</mn><mo>,</mo><mn>000</mn></mrow></math></span>, assessing their impact on the surrounding flow field and the resulting aerodynamic performance. First, the study shows that the torsionally hinged flaps effectively mitigate flow separation at a post-stall angle of attack <span><math><mrow><mi>α</mi><mo>=</mo><mn>2</mn><msup><mrow><mn>4</mn></mrow><mrow><mo>∘</mo></mrow></msup></mrow></math></span> with up to 22% lift improvements and 7% drag reduction. Second, results from a newly developed analytical model reveal that the flap’s oscillation frequency depends on the local flow velocity ahead of it and varies significantly as a function of the flap location. Trailing-edge flaps that experience low local velocities oscillate at their structural natural frequency. Meanwhile, leading-edge flaps with higher local velocity oscillate at a higher frequency than their natural frequency due to the aerodynamically induced added stiffness. The flap dynamics also depend on the energy spectrum of the flow, where flaps with lower effective oscillation frequencies exhibit higher fluctuations because they coincide with the flow’s high-energy frequency band. Finally, varying the flap’s inertia and hinge stiffness tunes its mean position and fluctuations to enhance the flow control mechanism employed by the flap. For instance, trailing-edge flaps enhance lift by acting as a pressure dam, with maximum effectiveness when the flap is perpendicular to the airfoil’s surface. Leading-edge flaps, on the other hand, improve lift by reducing adverse geometric pressure gradients, with maximum aerodynamic benefits occurring when the flap interacts with the shear layer with minimal fluctuations. This article provides a physics-based framework to enhance our understanding of covert-inspired flaps. Such knowledge can inform the design of passive and adaptive flow control strategies for various engineering applications.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104315"},"PeriodicalIF":3.4,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807001","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":"Assessment of regular and earthquake-induced wave hydrodynamic tests of moored and end-fixed submerged floating tunnels","authors":"Zhongxiang Liu ,&nbsp;Xueji Shi ,&nbsp;Tong Guo ,&nbsp;Hongyu Ren ,&nbsp;Jun Yu","doi":"10.1016/j.jfluidstructs.2025.104317","DOIUrl":"10.1016/j.jfluidstructs.2025.104317","url":null,"abstract":"<div><div>Submerged floating tunnel (SFT) is a new type of fully immersed sea-crossing structure for future traffic design, which has a high application prospect in complex bay environment. During the service lifespan, SFTs have the risk of wave impact. Therefore, to ensure safety and stability of the SFTs, hydrodynamic tests of a 1:60 scaled model were carried out in a large pool with underwater vibration table, where data on acceleration, roll, pitch rotation, yaw rotation, displacement, variation table and cable tension were collected. Comprehensive investigation was conducted to explore the excitation effects and hydroelastic responses of the model under regular and earthquake-induced waves with different immersion depths along with the modal characteristic analysis. The results show that the natural frequency of the SFT is significantly influenced by the angle of the cables. As the angle increases, the vertical stiffness of the system also increases, which consequently raises the natural frequency of the structure. According to hydrodynamic analysis, shallower the depth of the SFT, the more it hinders the propagation of waves, resulting in subsequent wave attenuation but aggravating structural responses. Furthermore, under regular and earthquake-induced waves, harmonic resonance can be triggered. The acceleration, roll angle, and cable tension undergo the most significant changes at the mid-span section. The increase in cable tension on the upstream side exceeds the decrease in tension under higher frequency wave due to wave impact force. There are discrepancies in angle responses among the cross-sections and the mid-span section demonstrates larger roll angles and smaller pitch and yaw angles, leading to phase angle deviations among the three variations. For earthquake-induced waves, more pronounced structural responses result from greater seismic acceleration amplitude and shallower immersion depth. And the response relationship between sway and heave, as well as the periodic variations in mooring cable tension and angle, remains consistent with that under regular waves. This consistency underscores that the dynamic behavior of the SFT is primarily governed by the intrinsic structural properties and hydrodynamic interactions, rather than the specific nature of the wave excitation.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104317"},"PeriodicalIF":3.4,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769104","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":"Pressure and flow patterns during multiple-order vertical vortex-induced vibrations of a 6:1 rectangular cylinder","authors":"Lin Zhao ,&nbsp;Tingshu Han ,&nbsp;Chuanxin Hu ,&nbsp;Song Luo ,&nbsp;Qiang Zhou ,&nbsp;Wei Cui","doi":"10.1016/j.jfluidstructs.2025.104314","DOIUrl":"10.1016/j.jfluidstructs.2025.104314","url":null,"abstract":"<div><div>Rectangular cross-sections have been typically used to investigate vortex-induced vibration (VIV) mechanism of bluff bodies, which provides important reference for wind-resistant design of engineering structures, such as high-rise buildings and long-span bridges. A numerical simulation was conducted in order to examine the multiple-order vertical VIV mechanism of a 6:1 rectangular cylinder, and the surface wind pressure distribution characteristics and surrounding flow field were particularly focused. This rectangular cylinder has two VIV lock-in regions. According to the surface pressure distribution characteristics, it is deduced from the proposed simplified vortex theory that there are significant vortices drifting on the upper and lower surfaces of the rectangular cylinder, and the vortex experiences approximate two and one vibration period drifting from the leading edge to the trailing edge in the first and second lock-in region, respectively. More characteristics of the flow field are revealed by dynamic mode decomposition (DMD) method. The front three non-zero DMD mode frequencies are about 1–3 times of the natural frequency of the rectangular cylinder, respectively. Multiple vortices are also observed on the upper and lower surfaces in the high-order DMD modes, especially in the second lock-in region, indicating the importance of vortex drifting phenomenon in the occurrence of VIV. This investigation provides a deeper viewpoint combining surface pressure distribution characteristics and surrounding flow patterns, which is of important reference for revealing the VIV mechanism of wind-sensitive structures with bluff body cross-sections.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104314"},"PeriodicalIF":3.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761181","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 enhanced SPH-based hydroelastic FSI solver with structural dynamic hourglass control","authors":"Yi Zhan ,&nbsp;Min Luo ,&nbsp;Abbas Khayyer","doi":"10.1016/j.jfluidstructs.2025.104295","DOIUrl":"10.1016/j.jfluidstructs.2025.104295","url":null,"abstract":"<div><div>This paper presents an enhanced hydroelastic FSI (Fluid-Structure Interaction) solver based on the open-source SPH (Smoothed Particle Hydrodynamics) code DualSPHysics+. For the structure model, a second-order discretization of the deformation gradient tensor (F2nd) is implemented to improve the accuracy of stress and strain computation. To mitigate numerical noises in the reproduced stress fields and improve numerical stability, a Riemann Stabilization (RS) term is incorporated in the structural momentum equation. A Dynamic Hourglass Control (DHGC) scheme being parameter-free is proposed to mitigate the spurious zero-energy modes linked with rank deficiency as a challenging issue for collocated computational methods including the total Lagrangian SPH. The novelty of this scheme is that it dynamically adjusts the hourglass control coefficient based on the instantaneous state of particle distributions and time evolution of an error function. For the fluid model, the Velocity divergence Error Mitigating (VEM) scheme and Hyperbolic/Parabolic Divergence Cleaning (HPDC) scheme are adopted to suppress spurious fluid pressure noises and hence enhance the modelling of fluid-structure interactions. Validations in terms of robustness and accuracy of the proposed model are carried out via five structure examples and three FSI ones. The results demonstrate that more physically consistent stress and strain fields are reproduced by the implementation of F2nd and RS. The proposed DHGC scheme effectively suppresses hourglass modes and is case- and resolution-independent (in contrast to the traditional Hourglass Control scheme). The incorporation of the VEM and HPDC mitigates fluid pressure noises and further enhances the accuracy of FSI simulations.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104295"},"PeriodicalIF":3.4,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143738974","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":"Nonlinear free vibrations of a nanocomposite micropipes conveying laminar flow subjected to thermal ambient: Employing invariant manifold approach","authors":"Peijun Zhang ,&nbsp;Wenchen Shao ,&nbsp;Hadi Arvin ,&nbsp;Wen Chen ,&nbsp;Wenjing Wu","doi":"10.1016/j.jfluidstructs.2025.104311","DOIUrl":"10.1016/j.jfluidstructs.2025.104311","url":null,"abstract":"<div><div>This research presents, for the first time, essential insights into the free vibrations of a composite micropipe enriched by means of graphene sheets (a GRC micropipe) conveying laminar flow subjected to a thermal ambient, preparing precious discernment for designers and engineers. The study develops the governing equations in the framework of the Euler–Bernoulli beam theory, the modified couple stress theory (MCST), von-Karman nonlinear relations for strains, and revised Halpin–Tsai relationships. Taking the advantage of invariant manifold procedure the two-degrees-of-freedom (DOFs) discretized governing equations, coupled gyroscopically, are reduced efficiently to one nonlinear governing equation with inertial nonlinearity that coping with it is considerably simpler. Leveraging the method of multiple scales (MMS) the nonlinear natural frequency, along with the accompanying nonlinearity constant is disclosed. It is underscored that the contribution of layer stacking on the vibrational behavior of GRC micropipes carrying laminar flow is substantially highlighted when the GRC micropipe is subjected to a thermal medium. It is observed that although it is expected to have a larger fundamental linear natural frequency for an FGV GRC micropie, at low temperatures UD GRC micropipe has the largest one for thin micropipes. It is shown that the hardening behavior of the first mode of the GRC micropipe is alleviated regarding the small scale factor while it is intensified regarding the flow profile effect. In sum imposing both factors relieves the first mode hardening behavior.</div></div>","PeriodicalId":54834,"journal":{"name":"Journal of Fluids and Structures","volume":"135 ","pages":"Article 104311"},"PeriodicalIF":3.4,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687446","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}