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fluid-structure interaction Analysis of a Wind Turbine Blade with Passive Control by Bend-Twist Coupling

ENERGIES 2023年第18期16卷 6619-6619页

作者： Tamayo-Avendano, Jorge Mario Patino-Arcila, Ivan David Nieto-Londono, Cesar Sierra-Perez, Julian Univ Pontificia Bolivariana Grp Invest Ingn Aerosp Medellin 050031 Colombia Inst Univ Pascual Bravo Grp Invest & Innovac Ambiental GIIAM Medellin 050034 Colombia Univ Pontificia Bolivariana Grp Energia & Termodinam Medellin 050031 Colombia

The idea of improving the energy output for small wind turbines without compromising the remaining aspects of the technology, such as costs and structural integrity, is very appealing in the context of the growing concern for global warming and the goal of providing electricity to remote and isolated regions. This work aims to contribute to the development of distributed wind generation by exploring the effects of bend-twist coupling on the performance of a wind turbine with a focus on a small rotor based on the NREL Phase VI blade geometry. After defining a structure in composite materials exhibiting the coupling behavior along with a reference counterpart, a comparative numerical analysis is performed using a fluid-structure interaction (FSI) analysis. The main numerical framework is based on commercial software and consists of a finite-volume solver for fluid physics, a finite-element solver for solid physics, and a coupling interface for the interaction problem. The results, complemented with the predictions from a one-way analysis based on the blade-element momentum theory are used to define the increments in rotor torque. The analysis of the annual energy yield shows a 3% increase due to the bend-twist coupling used as a passive pitch mechanism, considering a Rayleigh distribution with an 11 m/s average wind speed. Simultaneously, the coupling causes increments of 0.2% and 0.3% for the blade root flapwise moment and the rotor thrust force, respectively, when considering parked conditions and a simplified extreme wind model.

关键词： wind turbine composite blade passive control bend-twist coupling fluid-structure interaction

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ONE-WAY fluid-structure interaction OF SUBMERGED FLOATING TUNNEL UNDER CURRENT ACTION 43

ONE-WAY FLUID-STRUCTURE INTERACTION OF SUBMERGED FLOATING TU...

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ASME 43rd International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Pathak, Keshav Saha, Nilanjan Indian Inst Technol Madras Chennai Tamil Nadu India

ISBN: (纸本)9780791887844

The submerged floating tunnel (SFT) is a long tunnel that remains suspended below the water surface at a considerable depth of around 100-150 m and connects to land masses separated by 'deep' and vast water bodies. The present study aims to characterize the flow dynamics around an excessive buoyant type SFT with a circular cross-section. In this paper, one-way fluid-structure interaction analysis is carried out to analyze the dynamic behavior of SFT under current action. Computational fluid Dynamics (CFD) is implemented to perform a 2D numerical simulation of flow around the SFT cross-section. The k - omega SST turbulence model is implemented to capture the turbulence flow around the structure. The hydrodynamic load from the CFD solver is then sequentially transferred as a uniformly distributed transient load to a structural solver to study the dynamic behavior of the SFT tube segment. In structural solver, only a part of the structure separated by mooring lines at two ends (or SFT tube segment) is considered. Here, the structure is modelled as a Euler-Bernoulli's beam, discretized as line body elements, and supported by linear vertical springs equivalent to mooring lines at two ends. The structural response of the SFT tube segment and the flow pattern around the structure are discussed and validated from the literature.

关键词： Submerged Floating Tunnel Computational fluid dynamics fluid-structure interaction Dynamic analysis Vortex-Induced Vibration

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fluid-structure interaction and band gap analysis of periodic composite liquid-filled pipe

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COMPOSITE structureS 2023年第Part2期304卷

作者： Wu, Jiang-hai Sun, Yu-dong Su, Ming-zhu Zhu, Hong-zhen China Ship Sci Res Ctr Natl Key Lab Ship Vibrat & Noise Wuxi 214082 Peoples R China Wuxi Univ Fac Sci Dept Phys Wuxi 214045 Peoples R China

This paper studies the vibration band gap characteristics of a liquid-filled composite pipeline. The transfer matrix method is used to create a one-dimensional fluid-structure interaction model of the composite pipeline from the constitutive equation, physical equations, and boundary conditions of the anisotropic material. A phononic crystal pipeline is designed with a periodic arrangement on the axial pipe wall. The method used to analyze the fluid-structure interaction of liquid-filled composite and phononic crystal pipelines is verified by comparing responses with finite-element method results. The results' agreement demonstrates the method's and calculation code's correctness. Furthermore, the band gaps for an empty composite phononic crystal pipe, water hammer, and a liquid-filled pipe are calculated by Bloch vector theory, and the effects of fluid-structure interaction and the composite parameters on the three band gap characteristics are analyzed. The numerical results show that Poisson's coupling affects the band gap at some frequency points, while the laying angle and fiber volume fraction in the composite pipe influence the band gap length and amplitude change. The research results of this paper provide a reference for the design and vibration control of liquid-filled composite pipelines.

关键词： fluid-structure interaction Phononic crystal Vibration band gap Composite material

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Experimental Investigation of fluid-structure interaction of composite hydrofoils in cavitating flow

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Journal of Hydrodynamics 2022年第2期34卷 207-213页

作者： Hou-sheng Zhang Zhi-pu Guo Qin Wu Han-zhe Zhang Guo-yu Wang School of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China Aviation Engineering School Air Force Engineering UniversityXian710038China

This paper experimentally studies the cavitating fluid-structure interaction of composite hydrofoils with different ply *** synchronous measurement system with high-speed camera and for laser Doppler vibrometer(LDV),the feedback pressure regulation system,and the flow rate control system are *** experimental results of the cavitation evolution show that,compared with the rigid hydrofoil,the composite hydrofoils with+45°ply angle and 0°ply angle accelerate the cavitation inception,and the composite hydrofoil with−45°ply angle delays the cavitation *** the same cavitation number,the cloud cavitation of the+45°laminated hydrofoil is the most severe,followed by that of the 0°laminated hydrofoil,and that of the−45°laminated hydrofoil is relatively weak and close to that of the rigid *** analyses of the structural vibration of the composite hydrofoils in different cavitation stages show that the three composite hydrofoils have no significant vibration at the incipient cavitation and the supercavitation,but relatively significant vibration is observed in the sheet and cloud *** vibration amplitude of the composite hydrofoil with+45°ply angle is the largest,followed by those of the−45°,0°laminated *** the sheet cavitation,the dominant frequencies of the structural vibration velocity of the+45°laminated hydrofoil and the−45°laminated hydrofoil are the first and second modal frequencies,but no explicit dominant frequency is observed for the 0°laminated *** the cloud cavitation,the dominant frequencies of the three composite hydrofoils mainly include the first modal frequency,the second modal frequency,and the cavity shedding frequency.

关键词： Cavitation fluid-structure interaction composite hydrofoil cavity induced vibration

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A Three-Dimensional fluid-structure interaction Model for Platelet Aggregates Based on Porosity-Dependent Neo-Hookean Material 24th

A Three-Dimensional Fluid-Structure Interaction Model for Pl...

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24th International Conference on Computational Science (ICCS)

作者： Hao, Yue Hoekstra, Alfons G. Zavodszky, Gabor Univ Amsterdam Fac Sci Informat Inst Computat Sci Lab Amsterdam Netherlands Budapest Univ Technol & Econ Dept Hydrodynam Syst Budapest Hungary

ISBN: (纸本)9783031637858;9783031637834

The stability of the initial platelet aggregates is relevant in both hemostasis and thrombosis. Understanding the structural stresses of such aggregates under different flow conditions is crucial to gaining insight into the role of platelet activation and binding in the more complex process of clot formation. In this work, a three-dimensional implicit partitioned fluid-structure interaction (FSI) model is presented to study the deformation and structural stress of platelet aggregates in specific blood flow environments. Platelet aggregates are considered as porous mediums in the model. The FSI model couples a fluid solver based on Navier-Stokes equations and a porosity-dependent compressible neo-Hookean material to capture the mechanical characteristics of the platelet aggregates. A parametric study is performed to explore the influence of porosity and applied body force on this material. Based on in vitro experimental data, the deformation and associated stress of a low shear aggregate and a high shear aggregate under different flow conditions are evaluated. This FSI framework offers a way to elucidate the complex interaction between blood flow and platelet aggregates and is applicable to a wider range of porous biomaterials in flow.

关键词： Compressible neo-Hookean fluid-structure interaction Porosity Platelet aggregate

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Eulerian finite volume formulation using Lagrangian marker particles for incompressible fluid-structure interaction problems

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2022年第5期123卷 1294-1328页

作者： Shimada, Tokimasa Nishiguchi, Koji Bale, Rahul Okazawa, Shigenobu Tsubokura, Makoto RIKEN Ctr Computat Sci RIKEN Kobe Hyogo Japan Kobe Univ Grad Sch Syst Informat Dept Computat Sci Kobe Hyogo Japan Nagoya Univ Dept Civil & Environm Engn Nagoya Aichi Japan Univ Yamanashi Fac Engn Div Mech Engn Kofu Yamanashi Japan

We propose a monolithic fluid-structure interaction (FSI) method that uses the cell-centered finite volume formulation in the Eulerian description, Lagrangian marker particles allocated in the solid region, and the incompressible mixture formulation. In the proposed method, we compute all the basic equations and spatial derivatives, except the solid constitutive equations, on an Eulerian mesh to avoid neighboring particle search. Although full Eulerian methods that use a Cartesian mesh are attractive for FSI problems that require large-scale computing and include complex geometries and the large deformation of the solid, they cannot avoid the numerical dissipation of the interfaces or internal variables of the solid caused by their advection. This computational problem has been a barrier to the industrial application of full Eulerian mesh methods. In the numerical examples, we confirmed that the proposed method retains sharp interfaces, such as the corners of a square solid, and yields more accurate numerical results for the deformation, energy, and incompressibility of a solid in fluid than our conventional Eulerian FSI method.

关键词： Cartesian mesh collocated finite volume method Eulerian formulation fluid-structure interaction Lagrangian marker particles monolithic coupling

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Estimating external tissue support parameters with fluid-structure interaction models from 4D ultrasound of murine thoracic aortae

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ENGINEERING WITH COMPUTERS 2022年第5期38卷 4005-4022页

作者： Shidhore, Tanmay C. Cebull, Hannah L. Madden, Megan C. Christov, Ivan C. Rayz, Vitaliy L. Goergen, Craig J. Purdue Univ Sch Mech Engn 585 Purdue Mall W Lafayette IN 47907 USA Purdue Univ Weldon Sch Biomed Engn 206 S Martin Jischke Dr W Lafayette IN 47907 USA

Modeling of fluid-structure interactions (FSIs) between the deformable arterial wall and blood flow is necessary to obtain physiologically realistic computational models of cardiovascular systems. However, lack of information on the nature of contact between the outer vessel wall and surrounding tissue presents challenges in prescribing appropriate structural boundary conditions. Imaging techniques used to visualize wall deformation in vivo may be useful for estimating simulation parameters that capture the effects of both vascular composition and surrounding tissue support on the vessel wall displacement. Here, we present a method to calibrate external tissue support parameters in FSI simulations against four-dimensional ultrasound (4DUS) of the murine thoracic aortae. We collected ultrasound, blood pressure, and histological data from several mice infused with angiotensin II (n = 4) and created a representative model of healthy and diseased (at 28 days post-angiotensin II infusion) murine aortae. We ran pulsatile FSI simulations after accounting for increased arterial wall stiffness with varying levels of tissue support, which demonstrated non-trivial variation in not only structural quantities, such as vessel wall deformation, but also hemodynamic quantities, such as wall shear stress across simulations. Furthermore, we compared simulation results with in vivo 4DUS imaging data and observed that the suitable range of the tissue support spring parameter was identical for both healthy and diseased states. This indicated that the same tissue support parameter estimates could be used for modeling the healthy and diseased states of the vessel, provided that changes in arterial wall stiffness had been considered. We anticipate this technique and the tissue support estimates reported herein will help inform computational models of blood flow and vasculature that incorporate the influence of external tissue. [GRAPHICS] .

关键词： Murine model Thoracic aorta fluid-structure interaction Ultrasound Computational fluid dynamics Arterial wall deformation

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Topology optimization of structures subject to non-Newtonian fluid-structure interaction loads using integer linear programming

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FINITE ELEMENTS IN ANALYSIS AND DESIGN 2022年 202卷 103690-103690页

作者： Ranjbarzadeh, S. Picelli, R. Gioria, R. Silva, E. C. N. Univ Sao Paulo Dept Mechatron & Mech Syst Engn Av Prof Mello Moraes 2231 BR-05508030 Butanta SP Brazil Univ Sao Paulo Dept Min & Petr Engn Praca Narciso de Andrade S-N BR-11013560 Santos SP Brazil

This paper proposes a topology optimization design method for fluid-structure interaction (FSI) problems considering Non-Newtonian fluid such as blood and polymer solution. Non-Newtonian fluid does not obey the Newtonian relationship between the shear stress and shear rate. fluid-structure interaction involving Non Newtonian fluid has a wide range of application in oil and gas, chemical, food industries, microfluidics, and bio-engineering. We solve a compliance minimization problem subject to volume constraints of structures under FSI loads considering Non-Newtonian laminar flow. The structure is considered to undergo small deformation. The TOBS (Topology Optimization of Binary structures) method is applied to solve the material distribution problem. The TOBS approach uses binary {0, 1} design variables, which can be advantageous when dealing with design-dependent physics interactions, e.g., in cases where fluid-structure boundaries are allowed to change during optimization. The finite elements method is used to solve the fluid-structure equations and output the sensitivities using automatic differentiation. The TOBS optimizer provides a new set of {0, 1} variables at every iteration. Optimization results show that Non-Newtonian effects have a significant influence on FSI design.

关键词： fluid-structure interaction Topology optimization Non-Newtonian fluid Binary design variables TOBS method Finite elements method

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Extending a Van Der Pol-Based Reduced-Order Model for fluid-structure interaction Applied to Non-Synchronous Vibrations in Turbomachinery

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JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME 2022年第3期144卷 031006-031006页

作者： Hollenbach, Richard Kielb, Robert Hall, Kenneth Duke Univ Thomas Lord Dept Mech Engn & Mat Sci Durham NC 27703 USA Duke Univ Thomas Lord Dept Mech Engn & Mat Sci Durham NC 27708 USA

This paper expands upon a multi-degree-of-freedom, Van der Pol oscillator used to model buffet and nonsynchronous vibrations (NSV) in turbines. Two degrees-of-freedom are used, a fluid tracking variable incorporating a Van der Pol oscillator and a classic spring, mass, damper mounted cylinder variable;thus, this model is one of fluid-structure interaction. This model has been previously shown to exhibit the two main aspects of NSV. The first is the lock-in or entrainment phenomenon of the fluid shedding frequency jumping onto the natural frequency of the oscillator, while the second is a stable limit cycle oscillation (LCO) once the transient solution disappears. Improvements are made to the previous model to better understand this aeroelastic phenomenon. First, an error minimizing technique through a system identification method is used to tune the coefficients in the reduced-order model (ROM) to improve the accuracy in comparison to experimental data. Second, a cubic stiffness term is added to the fluid equation;this term is often seen in the Duffing Oscillator equation, which allows this ROM to capture the experimental behavior more accurately, seen in previous literature. The finalized model captures the experimental cylinder data found in literature much better than the previous model. These improvements also open the door for future models, such as that of a pitching airfoil or a turbomachinery blade, to create a preliminary design tool for studying NSV in turbomachinery.

关键词： nonsynchronous vibrations van der pol fluid-structure interaction turbomachinery reduced-order model aeromechanical instabilities fan compressor and turbine aerodynamic design fluid dynamics and heat transfer phenomena in compressor and turbine components of gas turbine engines

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Analysis of thermally activated fluid-structure interaction for a morphing plate immersed in turbulent flow

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INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 2022年 194卷

作者： Caccavale, Paolo Mele, Benedetto De Bonis, Maria Valeria Ruocco, Gianpaolo Univ Basilicata Coll Engn Via Ateneo Lucano I-85100 Potenza Italy Univ Federico II Ind Engn Dept Piazzale Tecchio I-80125 Naples Italy

In the framework of vehicle aerodynamics, new integrated systems can be developed based on shape memory metal alloys (SMAs) capability to perform surface morphing. Such systems can be exploited to create appendices containing active composites that change shape in response to variable thermal inputs, in relation to the desired aerodynamic behavior. The purpose of these systems is to offer benefits in terms of vehicle's performance and fuel consumption rate. Even the design of the simplest geometry appendix, a finite horizontal plate aligned with a turbulent air flow, is nevertheless affected by three intertwined and nonlinear phenomena - namely the solid/fluid/thermal interactions. In order to approach the definition of appropriate design parameters, the space of operating variables must be explored by devising a numerical simulation encompassing the equation of structural motion and the energy and Reynolds Averaged Navier Stokes equations, complemented by a viable turbulence model. In this paper, a fully-coupled model encompassing all phenomena involved is tested by implementing a sensitivity analysis for a thermally activated morphing surface. Temperature, stress and velocity distributions are presented and discussed for a given geometry case. A new metrics leading to aerodynamic lift calculations is then proposed and demonstrated, that will simplify the preliminary design procedures. (C) 2022 Elsevier Ltd. All rights reserved.

关键词： Forced convection Conduction Conjugate heat transfer Computational fluid dynamics Shape memory alloy fluid-structure interaction

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