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Flow-induced vibration of an S-shaped bluff elastic sheet J. Fluids Struct. (IF 3.6) Pub Date : 2024-04-15 Junkyu Ham, Minho Song, Janggon Yoo, Daegyoum Kim
The dynamics of an S-shaped elastic sheet, in which the inclination angles of two clamped ends are normal to the direction of uniform flow and opposite to each other, are experimentally investigated. Flow-induced vibrations are ensured in this novel configuration by the substantial area perpendicular to the flow and the bluff shape. The motions of the sheet can be divided into three modes depending
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Fully coupled forced response analysis of nonlinear turbine blade vibrations in the frequency domain J. Fluids Struct. (IF 3.6) Pub Date : 2024-04-15 Christian Berthold, Johann Gross, Christian Frey, Malte Krack
For the first time, a fully-coupled Harmonic Balance method is developed for the forced response of turbomachinery blades. The method is applied to a state-of-the-art model of a turbine bladed disk with interlocked shrouds subjected to wake-induced loading. The recurrent partial opening and closing of the pre-loaded shroud contact causes a softening effect, leading to turning points in the amplitude–frequency
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Morphing of high-lift wing-flap system with cambering and trailing-edge flapping at high Reynolds number towards a full airplane application J. Fluids Struct. (IF 3.6) Pub Date : 2024-04-15 Abderahmane Marouf, Dominique Charbonnier, Jan B. Vos, Rajaa El Akoury, Yannick Hoarau, Marianna Braza
This study concerns a numerical investigation of new morphing concepts by means of high-fidelity simulation around a high-lift wing-flap system and a real scale Airbus A320 airplane. A new designed hybrid morphing flap is proposed based on cambering at high deformation amplitudes associated with trailing-edge flapping at an actuation frequency in the order of 300 Hz. The numerical results are obtained
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A flexible sheet in the wake of a cylinder forced to rotate J. Fluids Struct. (IF 3.6) Pub Date : 2024-04-10 Adrian Carleton, Yahya Modarres-Sadeghi
We discuss the behavior of a flexible sheet placed in the wake of a cylinder that is forced to rotate periodically. This is done through a series of experiments conducted in a water tunnel and by simultaneously visualizing the flow behavior and tracking the motion of the flexible sheet in the wake of the cylinder. We show how the response of a flexible sheet in the wake of a fixed cylinder, which is
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Aerodynamic interaction between galloping instability and vortices in corner-cut rectangular cylinders J. Fluids Struct. (IF 3.6) Pub Date : 2024-04-08 Thinzar Hnin, Tomomi Yagi, Kyohei Noguchi, Manoj Pradhan, Rintaro Kyotani, Hisato Matsumiya
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Experimental and theoretical fluid dynamics of spherical Savonius turbines operated in pipe flows J. Fluids Struct. (IF 3.6) Pub Date : 2024-04-01 Yuichi Murai, Takahiro Umemura, Hyun Jin Park, Yasufumi Horimoto, Yuji Tasaka
The performance of Savonius turbines driven by flow in a pipe is experimentally investigated. The turbine is manufactured to have a spherical outline based on the pipe cross section at a small clearance. The torque and power of the turbine are obtained from the time derivative of the rotational speed measured using a high-speed camera and an equation of rotational motion. We find that the idling tip-speed
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Angular vortex-induced vibrations of a cylinder J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-29 Adrian Carleton, Yahya Modarres-Sadeghi
We consider the response of a flexibly-mounted cylinder placed in flow and free to oscillate on a curved path about a pivot point. The curved path could be concave (i.e., bent toward the incoming flow) or convex (i.e., bent away from the incoming flow). We consider different radii of curvature for both the concave and the convex paths and show that oscillations are observed for radii of curvature larger
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Fully Eulerian models for the numerical simulation of capsules with an elastic bulk nucleus J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-26 Florian Desmons, Thomas Milcent, Anne-Virginie Salsac, Mirco Ciallella
In this paper, we present a computational framework based on fully Eulerian models for fluid–structure interaction for the numerical simulation of biological capsules. The flexibility of such models, given by the Eulerian treatment of the interface and deformations, allows us to easily deal with the large deformations experienced by the capsule. The modeling of the membrane is based on a full membrane
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Low-frequency vibration reduction of an underwater metamaterial plate excited by a turbulent boundary layer J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-23 Wenkai Dong, Zhangkai Huang, Ting Wang, Meixia Chen
Flow-induced structural noise is an important component of hydrodynamic noise of underwater structures. Local resonance metamaterials are considered to have excellent performance and enormous potential in the field of low-frequency vibration and noise control. To verify its potential, the paper derived the underwater band gap of a lateral local resonance (LLR) plate through the plane wave expansion
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Control of vortex shedding and acoustic resonance of a circular cylinder in cross-flow J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-19 R. Noufal, M. Alziadeh, A. Mohany
This study experimentally investigates the effectiveness of a control rod in suppressing self-excited acoustic resonance within a range of Reynolds numbers (Re) spanning from × to × . The investigation focuses on specific parameters, including diameter ratio () values of 0.1, 0.2, and 0.3; gap ratio () values of 0.05, 0.1, and 0.2; and angular positions () ranging from 0 to 180 degrees. Comparative
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A two-step fluid–structure approach for the vibration analysis of flexible propeller blade J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-19 Quentin Rakotomalala, Lucie Rouleau, Cédric Leblond, Mickaël Abbas, Jean-François Deü
In this paper, a numerical approach able to evaluate the sound power emitted by a non-cavitating flexible marine propeller blade is proposed. With asymptotic expansions and order of magnitude analysis, two main phenomena are identified: the so-called propulsion and vibroacoustic phenomenon. The propulsion phenomenon is nonlinear and models the lift generation along the blade. It creates a pre-stress
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Design and analysis of a novel magnetic helical swimmer J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-16 Pouria Piranfar, Mahyar Naraghi, Ali Kamali Egoli
Magnetic helical swimmers are one type of robots that swim at low Reynolds number environments by rotating around the helix axis. Considering the importance and dramatic increase in the use of robots and microrobots in the near future, optimizing and increasing their efficiency is very important and noteworthy. Propulsion force and translational velocity are among the most important features of the
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Fluid-solid interaction simulations of an aeroelastic square prism in sinusoidal oscillatory flows J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-15 Bin Lu, Qiusheng Li, Xuliang Han, Xincong Wang
This study numerically investigates the aerodynamic and aeroelastic characteristics of a square prism (aeroelastic model) and wind field around it in sinusoidal oscillatory flows (SOFs). The reliability of the fluid-solid interaction (FSI) simulation is validated by a free vibration test and wind tunnel tests in smooth flow and SOF. The effects of the amplitude and frequency of SOFs are studied at
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On the coexistence of pressure regulation and oscillation modes in soft hysteretic valves J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-11 Lucas C. van Laake, Alberto Comoretto, Johannes T.B. Overvelde
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Numerical simulation of wave interactions with floating offshore renewable energy structures: A comparative study between a Particle-based PIC model and OpenFOAM J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-10 Haoyu Ding, Qiang Chen, Jun Zang
Mesh-based Eulerian and particle-based Lagrangian models are common computational fluid dynamics (CFD) tools for simulating wave-structure interactions. While Eulerian models are efficient in terms of computational time, they are limited in their ability to handle large interface discontinuities between two flows and complex structure motion responses. Conversely, Lagrangian models are suitable for
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Fast unsteady method for non-linear aeroelastic responses of flexible aircraft wings encountering wind gusts J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-04 Oriol Chandre-Vila, Jean-Philippe Boin, Yann Nivet, Sylvie Marquier, Joseph Morlier, Nicolas Gourdain
Given the current context of changes in aeronautics to reduce emissions, it is also necessary to modernise the computation methods to anticipate future cases where disciplines which are now calculated separately (i.e. manoeuvers and gusts) should be computed at the same time including flexible effects and using a time-domain approach. In this work, a static aeroelasticity formulation is adapted to
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Stability and orthogonality of fluid-structure interaction transfer matrix for liquid-filled pipeline systems J. Fluids Struct. (IF 3.6) Pub Date : 2024-03-02 Tang Li, Xiaoting Rui, Jianshu Zhang, Qixing Yue, Yangyang Miao
The study of the vibration characteristics of the liquid-filled pipeline has important academic significance and practical value for analyzing the dynamic behavior of the pipeline system, ensuring its stability and improving its reliability. The fluid-structure interaction transfer matrix method (FSITMM) is regarded as an effective method for the study of these vibration characteristics. Nonetheless
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Improving predictions of vortex induced vibrations via generalizable hydrodynamic databases across several current incidence angles J. Fluids Struct. (IF 3.6) Pub Date : 2024-02-28 José del Águila Ferrandis, Andreas Mentzelopoulos, Edvard Ronglan, Samuel Rudy, Dixia Fan, Themistoklis Sapsis, Michael S. Triantafyllou
Vortex induced vibrations is a withstanding ubiquitous problem in the marine industry. Although seemingly simple, cylindrical structures in cross-flows originate extremely complex and, at times, chaotic hydrodynamics which are not fully understood nowadays. One of the biggest industries driving economic development that has had to deal which this problem is Offshore Oil & Gas. Key to a safe oil extraction
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Theory of nonlocal modal hydrodynamic functions for beam and plate vibrations in viscous fluids J. Fluids Struct. (IF 3.6) Pub Date : 2024-02-27 Burak Gulsacan, Matteo Aureli
In this paper, we introduce a new nonlocal modal hydrodynamic theory for fluid–structure interactions (FSI) of light, flexible cantilever beams and plates undergoing small amplitude vibrations in Newtonian, incompressible, viscous, heavy fluids otherwise at rest. For low aspect ratio flexible structures and high mode numbers, three dimensional (3D) and nonlocal fluid effects become prominent drivers
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Study on the influence of structural parameters and 3D effects on nonlinear bridge flutter using amplitude-dependent flutter derivatives J. Fluids Struct. (IF 3.6) Pub Date : 2024-02-22 Kai Li, Yan Han, C.S. Cai, Jun Song, Peng Hu
To estimate nonlinear flutter response of long-span bridges, this study established a method for identifying full set of amplitude-dependent flutter derivatives (FDs) from free vibration wind tunnel tests. Taking a typical double-deck truss bridge as a Case study, the amplitude-dependent FDs of the bridge deck at the whole wind speed regime are identified and cross-validated based on large-amplitude
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Reduction of interaction noise using grooved cylinder and wavy leading edge airfoil J. Fluids Struct. (IF 3.6) Pub Date : 2024-02-22 Xiaowei Sun, Chengchun Zhang, Chun Shen, Wen Cheng, Zhen Cui, Zhengyang Wu, Zhengwu Chen, Longwu Zhao
The grooved and the wavy leading edge structures have been designed to reduce the interaction noise generated by the cylinder-airfoil model. The wind tunnel tests conducted at different incoming velocities ranging from 40 to 60 m/s, revealing that the wavy leading edge structure only exhibits a noise reduction effect within the mid-frequency band (800∼4000 Hz). However, the combination of the two structures
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Performance of flat-plate aluminum structures subjected to in-contact underwater explosions J. Fluids Struct. (IF 3.6) Pub Date : 2024-02-08 Bastian Madsen, Gregory Morgan, Carl-Ernst Rousseau, Arun Shukla
This work investigates the effects of in-contact Underwater Explosion (UNDEX) on flat plates of various thicknesses. The interaction between generated bubbles and the plates is also studied. High-speed photography paired with digital image correlation (DIC) was used to capture full-field displacements, velocities, and strains on the plates during loading. Shockwave pressure was also recorded using
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Free vibration analysis of a clamped cylindrical shell with internal and external fluid interaction J. Fluids Struct. (IF 3.6) Pub Date : 2024-02-07 Roger O.P. Montes, Frederico M.A. Silva, Lineu J. Pedroso
Cylindrical shells filled with fluid are structures widely used in different engineering installations, such as oil platforms, nuclear power plants and storage tanks. In offshore structures, the action of ocean waves must be carefully evaluated, because the influence of the external fluid to the external walls of this structure can modify its dynamic behavior. This article presents an analytical-numerical
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A computational model of red blood cells using an isogeometric formulation with T-splines and a lattice Boltzmann method J. Fluids Struct. (IF 3.6) Pub Date : 2024-02-07 Yusuke Asai, Shunichi Ishida, Hironori Takeda, Gakuto Nakaie, Takuya Terahara, Yasutoshi Taniguchi, Kenji Takizawa, Yohsuke Imai
The red blood cell (RBC) membrane is often modeled by Skalak strain energy and Helfrich bending energy functions, for which high-order representation of the membrane surface is required. We develop a numerical model of RBCs using an isogeometric discretization with T-splines. A variational formulation is applied to compute the external load on the membrane with a direct discretization of second-order
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Lift enhancement mechanism study of the airfoil with a dielectric elastic membrane skin J. Fluids Struct. (IF 3.6) Pub Date : 2024-02-06 Wei Kang, Shilin Hu, Yanqing Wang
Lift enhancement mechanism of an airfoil with the dielectric elastic membrane skin is studied numerically for smart flow control. The flexible membrane is made of dielectric highly elastic polymer material. Such kind of material can deform and oscillate under the prescribed electric potential difference. The dynamic modeling of the dielectric elastic structure is established to describe the electromechanical
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Aerodynamics on a faithful hindwing model of a migratory dragonfly based on 3D scan data J. Fluids Struct. (IF 3.6) Pub Date : 2024-02-06 Yuma Narita, Kazuhisa Chiba
In this study, we examined the aerodynamics around the hindwing of a faithfully reproduced Pantala Flavescens (globe wanderer) under gliding conditions. The dragonfly wing is corrugated, with numerous veins running through the entire wing. This convexoconcave geometry improves the lift-to-drag ratio under low Reynolds number conditions. However, until now, aerodynamic analyses have only been performed
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The dynamics of cantilevered structures subject to axial flow J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-25 M, i, c, h, a, e, l, , P, ., , P, a, ï, d, o, u, s, s, i, s
The dynamics of slender cantilevered cylinders subjected to internal or external axial flow has been studied extensively from the 1960s onwards. In the early studies, the flow was directed from the clamped end towards the free end of the cantilever. The same is true for cantilevered plates (or “flags”) in axial flow. More recently, however, the dynamics in reverse axial flow, i.e., flow directed from
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Experimental analysis of trailing edge hydroelastic coupling on a hydrofoil J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-23 P. François, J.A. Astolfi, X. Amandolèse
This paper explores the conditions for hydroelastic trailing edge vibrations generating tonal noise on a NACA0015 aluminium hydrofoil clamped in a hydrodynamic tunnel. Tests were performed for Reynolds numbers , ranging from up to and various angles of attack , from 0 up to 10°. A laser vibrometer was used to characterize the hydrofoil vibratory response. Time Resolved Particle Image Velocimetry (TR-PIV)
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Numerical investigation of liquid sloshing in 2D flexible tanks subjected to complex external loading J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-22 Kim Q.N. Kha, Mustapha Benaouicha, Sylvain Guillou, Abdelghani Seghir
Due to the complexity of fluid–structure interactions (FSI), the majority of studies in the literature dealing with the sloshing problem are restricted to rigid tanks. This paper is devoted to a numerical investigation of the liquid sloshing behavior in a flexible tank subjected to external loading. A numerical methodology is proposed, taking into account the FSI problem by coupling two open-source
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Numerical modelling of a vertical cylinder with dynamic response in steep and breaking waves using smoothed particle hydrodynamics J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-20 Yong Yang, Aaron English, Benedict D. Rogers, Peter K. Stansby, Dimitris Stagonas, Eugeny Buldakov, Samuel Draycott
Highly nonlinear near-breaking and spilling breaking wave groups are common extreme events in the ocean. Accurate force prediction on offshore and ocean structures in these extreme wave conditions based on numerical approaches remains a problem of great practical importance. Most previous numerical studies have concentrated on non-breaking wave forces on rigid structures. Taking advantage of the smoothed
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Modeling vortex-induced vibrations of branched structures by coupling a 3D-corotational frame finite element formulation with wake-oscillators J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-19 Alexandre Villié, Mauricio C. Vanzulli, Jorge M. Pérez Zerpa, Jérôme Vétel, Stéphane Etienne, Frédérick P. Gosselin
Branched structures are present in a diverse set of problems, from modeling branch pipe connections to simulating tree dynamics. Soft corals like the Bipinnate sea plume, have a branched geometry and are soft enough to bend under the waves. Due to their circular cross section, a vortex street forms in the coral’s wake inducing vibrations of its branches. Despite extensive studies on VIV in straight
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ADV measurements of blockage flow effects near a model jacket in waves and current J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-18 A.J. Archer, H.A. Wolgamot, J. Orszaghova, S. Dai, P.H. Taylor
Design standards for drag loading on offshore jacket structures do not presently account for the reduction in forces arising from flow blockage effects in the event of combined waves and current. This force reduction is believed to originate in reduced mean flow velocity through the jacket, but this has never been directly measured. To address this, we conducted physical-model tests which measured
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Pore-scale numerical analysis of fluid flows in compressed polyurethane foams with a workflow of open-cell foams modeling J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-18 Alaa-Eddine Ennazii, A. Beaudoin, A. Fatu, P. Doumalin, J. Bouyer, P. Jolly, Y. Henry, E. Laçaj, B. Couderc
eX-Poro-HydroDynamic (XPHD) lubrication presents a different scientific approach to dealing with tribological problems. It is an innovative inter- and multidisciplinary research topic which offers a promising sliding solution for various applications, such as thrust bearings, various guide components and in terms of load capacity and damping. XPHD lubrication is a lubrication mechanism of biomimetic
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On quasi-steadiness of transverse galloping of rectangular cylinders at Reynolds numbers below 10,000 J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-16 Ahmed M. Naguib, Mark A. Feero, Alireza Safaripour, Manoochehr M. Koochesfahani
Forced transverse oscillations are used to investigate the quasi-steady behavior of a rectangular cylinder with a side ratio of 2 at Reynolds numbers less than 10,000 (based on cylinder thickness). To this end, phase-averaged measurements of the transverse force acting on the oscillating cylinder at different phases of motion are compared to the mean force acting on the static cylinder at different
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Effects of kinematic parameters and corrugated structure on the aerodynamic performance of flexible dragonfly wings J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-16 Weizhen Sun, Yuping Wang, Guoyi He, Qi Wang, Feng Yu, Wei Song
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An experimental investigation into the effect two-phase flow induced vibrations have on a J-shaped flexible pipe J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-16 D.J. Pickles, G. Hunt, A.J. Elliott, A. Cammarano, G. Falcone
Multiphase flow inside of pipes occurs in a wide variety of engineering applications, including offshore deep-water oil and gas transport. Vibrations induced by the flow inside of the pipe can lead to its mechanical failure and thus lead to uncontrolled release of the fluids being transported. In subsea applications, flexible J-risers are often employed to deliver the produced fluids from the seafloor
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Physics-informed neural networks modelling for systems with moving immersed boundaries: Application to an unsteady flow past a plunging foil J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-13 Rahul Sundar, Dipanjan Majumdar, Didier Lucor, Sunetra Sarkar
Physics informed neural networks (PINNs) have been explored extensively in the recent past for solving various forward and inverse problems for facilitating querying applications in fluid mechanics. However, investigations on PINNs for unsteady flows past moving bodies, such as flapping wings are scarce. Earlier studies mostly relied on transferring the problems to a body-attached frame of reference
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Falling liquid films on a uniformly heated compliant substrate with broken time-reversal symmetry J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-12 Akshay S. Desai, Souradip Chattopadhyay, Amar K. Gaonkar
This study aims to analyze the dynamics of a thin Newtonian liquid film on a uniformly heated compliant substrate. We consider the violation of time-reversal symmetry in the liquid, resulting in an additional non-zero term in the liquid stress tensor. Using the long-wave expansion technique, we derive a set of coupled equations governing the film thickness and substrate deformation, accounting for
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Theoretical and CFD investigation on nonlinear dynamics of a cable under vortex-induced vibration with different aerodynamic shapes J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-11 Yunyue Cong, Daozhan Wei, Houjun Kang, Xiaoyang Su, Yaping Jiang
This paper investigates the effect of the aerodynamic shape on nonlinear dynamics of a cable induced by vortex-induced vibration (VIV) with theoretical and computational fluid dynamics (CFD) method. Firstly, a two-dimensional (2-D) CFD model is established and calculated by using the shear stress transport (SST) - model to supply the necessary drag and lift coefficients for perturbation analysis. Secondly
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Experimental investigation of instantaneous lift on NACA 0018 airfoil section due to a non-harmonic pitching motion J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-09 Ilya Lesovoy, Ron Efrati, Oksana Stalnov
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Experimental study of flag fluid–structure interaction in a laminar jet and application of POD J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-08 Rodrigo Padilla, Vibhav Durgesh, Tao Xing, Anas Nawafleh
A fluttering flag in a uniform laminar flow exhibits complex fluid–structure interaction (FSI) behavior. This investigation experimentally studied aerodynamic load behavior and its connection to the oscillation behavior, flag envelope and fluid flow parameters, and application of Proper Orthogonal Decomposition (POD) to fluid flow data to elucidate changes in flow behavior associated with the changes
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Bragg scattering by an irregular versatile seabed in the presence of current J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-08 Sagarika Khuntia, Smrutiranjan Mohapatra, Sanjay Kumar Mohanty
The Bragg scattering due to an undulated elastic bottom in the presence of a uniform current is discussed in the present paper. The conditions of Bragg resonance are derived analytically and discussed numerically for various values of physical parameters. The mathematical techniques used for discussing the analysis are the perturbation and Fourier transform methods. It is seen that the amplitude of
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Hydroelastic theory for offshore floating plates of variable flexural rigidity J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-08 S. Michele, S. Zheng, E. Renzi, A.G.L. Borthwick, D.M. Greaves
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Influence of sweep angle on performance of a fully-passive oscillating-plate hydrokinetic turbine prototype J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-05 Waltfred Lee, Guy Dumas, Peter Oshkai
Power extraction performance of a fully-passive oscillating-plate hydrokinetic turbine prototype was investigated experimentally using measurements of the kinematics of the flat plate and the estimated power extraction. Two configurations were considered: a flat plate with a 6 sweep angle and an unswept plate (control configuration), which were undergoing fully-passive pitching and heaving motions
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Experimental study of parametric vibrations of arc-shaped tubes with pulsating fluid flow J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-05 A, n, d, r, z, e, j, , C, z, e, r, w, i, ń, s, k, i
The dynamics of curved tubes with fluid flow fixed on both sides was studied experimentally. Two cases were studied in which the curved tubes differed in curvature. Tests were performed with the flow without pulsation to determine the natural frequencies and with pulsation to determine the interesting dynamic phenomena occurring in the system. Two alternative measurement systems were used to study
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Experimental investigation of flow characteristics around tandem arrangement of triangular and square cylinders J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-04 Paweł Niegodajew, Karolina Gajewska, Witold Elsner, Renata Gnatowska
The paper presents an experimental investigation of the flow around two bluff bodies in a tandem arrangement. Two different configurations were investigated. The first one concerns two square cylinders (SS case) whereas in the second setup, a triangular cylinder was used as an upstream object (TS case). Particular attention was devoted to examining the effect of the gap space between cylinders (from
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Two-dimensional pressure field imaging of an elastic panel executing post-flutter oscillations J. Fluids Struct. (IF 3.6) Pub Date : 2024-01-03 Santosh V. Varigonda, Luisa P. Serafim, Maxim Freydin, Earl. H. Dowell, Venkateswaran Narayanaswamy
Two dimensional pressure field was acquired at 10 kHz to study the post flutter oscillations of a thin elastic panel placed beneath a Mach 2.5 turbulent boundary layer. The panel was made of aluminum and is secured to the mounting fixture using a collection of rivets, which resulted in a boundary condition that was between both ideally clamped and pinned boundaries. Direct comparison of the mean and
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Passive control of flow-induced vibration of a sphere using a trip wire J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-29 Anchal Sareen, Kerry Hourigan, Mark C. Thompson
We experimentally investigated the potential of a trip wire as a passive control mechanism for controlling flow-induced vibration (FIV) of a three-dimensional bluff body. The effect of a surface trip wire was investigated for varying diameter ratio in the range 1.3×10−2⩽k/D⩽6.7×10−2, where k is the wire diameter and D is the sphere diameter, and trip-wire location in the range 20∘≤ϕ≤60∘, where the
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Stochastic performance of a torsional-flutter harvester in non-stationary, turbulent thunderstorm outflows J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-29 Luca Caracoglia
Efficiency of a torsional-flutter energy harvester in thunderstorm-like wind flows is studied. The apparatus has been proposed in recent years as an alternative to other flapping windmills of medium size due to its simple installation and operational mechanism. The paper investigates a rapid change of wind load intensity, induced by a thunderstorm, which may either reduce the output energy conversion
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Movement of and drag force on slender flat plates in an array exposed to combinations of unidirectional and oscillatory flow J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-26 Rachel Schaefer, Heidi Nepf
When flexible structures deflect under unidirectional flow or sway under oscillatory flow, their hydrodynamic drag forces are reduced. The flow-induced motion of a structure is governed by the balance between hydrodynamic forces and restoring forces due to stiffness (a ratio known as the Cauchy number, Ca). Movement of and drag on structures under unidirectional (current) and oscillatory (wave) flow
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Aeroelastic reduced-order modeling for efficient static aeroelastic analysis considering geometric nonlinearity J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-28 Kai Li, Jiaqing Kou, Weiwei Zhang
The computational fluid dynamic/computational structural dynamic (CFD/CSD) coupling method plays an important role in static aeroelastic problems accounting for structural geometric nonlinearity. However, a huge computational burden comes from the CFD simulation, which also dominates the computational cost of the CFD/CSD coupling method. Therefore, this paper presents a reduced-order framework for
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Mean drag reduction of a square cylinder using self-adaptive flaps J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-28 Azeddine Kourta, Nicolas Mazellier
We report an experimental study about the control of the turbulent wake of a square cylinder. The control device consists in a couple of compliant flaps implemented on the sides of the square cylinder. Both flaps are hinged so that they can freely rotate around their leading edge. Particular emphasis is given to the analysis of the wake through the investigation of both mean and turbulent velocity
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On the omnidirectionality of a system with eight spinning rods for wake control of a circular cylinder in laminar regime J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-26 I.A. Carvalho, G.R.S. Assi
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Nonlinear shock-induced flutter of a compliant panel using a fully coupled fluid-thermal-structure interaction model J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-20 Al Shahriar, Kourosh Shoele
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Aerodynamics of finite wings with leading-edge flags J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-20 Junchen Tan, Zhijin Wang, Ismet Gursul
Post-stall lift enhancement on rectangular and tapered wing planforms by means of attached leading-edge flags has been investigated at a Reynolds number of 100,000. The study has aimed to investigate the fluid-flag interactions in the presence of a wing tip and variable chord-length, and also compares the results with those for the two-dimensional airfoil case. For the rectangular wing, the characteristics
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Influence of magnetically-induced nonlinear added stiffness on the lift galloping of square cylinders at low Reynolds number J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-21 Mostafa R. Rashed, Mostafa E.A. Elsayed, Mahmoud Shaaban
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The sedimentation behaviors of elliptical active particles in a rectangular box J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-21 Chen Liu, Zhenyu Ouyang, Jianzhong Lin
The “squirmer” model, a micro-swimming model driven by an imposed tangential velocity at the boundaries, is used to simulate the sedimentation behaviors of one and two elliptical active particles in a two-dimensional rectangular box. Six typical locomotion modes (including the steady vertically moving (SVM), steady inclined sliding (SIS), unilateral attracted oscillating (UAO), bilateral attracted
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Hydrodynamic interactions and membrane damage for a pair of microcapsules in shear flow: Effect of membrane mechanical properties J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-22 Xu-Qu Hu, Claire Dupont, Anne-Virginie Salsac, Dominique Barthès-Biesel
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Thrust force is tuned by the rigidity distribution in insect-inspired flapping wings J. Fluids Struct. (IF 3.6) Pub Date : 2023-12-15 Roméo Antier, Benjamin Thiria, Ramiro Godoy-Diana
We study the aerodynamics of a flapping flexible wing with a two-vein pattern that mimics the elastic response of insect wings in a simplified manner. The experiments reveal a non-monotonic variation of the thrust force produced by the wings when the angle between the two veins is varied. An optimal configuration is consistently reached when the two veins are spaced at an angle of about 20 degrees