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Investigation of the effect of adaptive characteristics on non-cavitating noise for flexible propeller in non-uniform flow via the fluid-structure interaction model

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INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING 2023年 15卷

作者： Choi, Yo-Seb Hong, Suk-Yoon Song, Jee-Hun Seoul Natl Univ Dept Naval Architecture & Ocean Engn Seoul South Korea Seoul Natl Univ Inst Engn Res Seoul South Korea Chonnam Natl Univ Dept Naval Architecture & Ocean Engn Yeosu South Korea

When constructing a low-noise submarine, it is crucial to consider the non-cavitating noise from the propeller. Non-cavitating noise reduction is crucial for submarine stealth and survivability. Recently, several studies have been conducted on the use of flexible propellers as a means of reducing non-cavitating noise. However, there are no studies on the use of flexible propellers with adaptive charac-teristics to reduce noise in wake fields. Thus, this study investigated the noise reduction effect of adaptive characteristics on non-cavitating noise for the flexible propeller in the wake field. Numerical in-vestigations on the main propeller variables were conducted based on the proposed procedure using fluid-structure interaction and acoustic analysis models. The results were compared with those of rigid propellers to determine the possible reasons for noise reduction. Finally, the acoustic analysis results of the flexible propeller were compared with those of the rigid propeller to reveal the effectiveness of the adaptive characteristics.& COPY;2023 Society of Naval Architects of Korea. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Flexible propeller Adaptive characteristics Non-cavitating noise fluid-structure interaction Non-uniform flow

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Design of a high fidelity fluid-structure interaction solver using LES on unstructured grid

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COMPUTERS & fluidS 2023年第1期265卷

作者： Fabbri, T. Balarac, G. Moureau, V. Benard, P. Univ Grenoble Alpes Grenoble INP CNRS LEGI F-38000 Grenoble France Inst Univ France IUF Paris France Normandie Univ INSA Rouen UNIROUEN CNRSCORIA F-76000 Rouen France

Despite promising experimental works, high fidelity numerical simulations of chordwise flexible blade are useful to better understanding. However, such simulation remains a challenging problem as it requires a fluid- structure interaction (FSI) solver capable of accurately predicting the stall dynamics, while computing the deformation of a solid with complex geometry. In this paper, the authors propose a LES-based FSI solver using 3D solid elements for the solid and unstructured grid for fluid and solid solvers. This approach aims at being universal and is based on a partitioned coupling scheme, allowing low density ratios of the structure to the fluid. It uses an original pseudo-solid method for the mesh movement solving, specifically developed for this work. Besides, this solver is suited for massively parallel computing and can perform Dynamic Mesh Adaptation to be able to take into account any solid movement. Both fluid and solid solvers are validated independently before validation of the FSI solver against a 2D laminar benchmark, including mesh convergence study. The entire methodology is then successfully applied to experimental 3D complex case with high Reynolds number, confirming the potential of the FSI solver for its intended use, without geometry restriction. This is finally illustrated with a simulation of an experiment involving a chordwise flexible blade with large deformation, which has never been reproduced with a 3D LES approach in literature so far.

关键词： fluid-structure interaction Large-Eddy Simulation Finite Element Method Unstructured grid Dynamic Mesh Adaptation Mesh movement Pseudo-solid Partitioned scheme Chordwise flexible foil

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fluid-structure interaction for the Classroom: Interpolation, Hearts, and Swimming!

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SIAM REVIEW 2021年第1期63卷 181-207页

作者： Battista, Nicholas A. Coll New Jersey Dept Math & Stat Ewing Township NJ 08628 USA

While students may find spline interpolation quite digestible based on their familiarity with the continuity of a function and its derivatives, some of its inherent value may be missed when they only see it applied to standard data interpolation exercises. In this paper, we offer alternatives in which students can qualitatively and quantitatively witness the resulting dynamical differences when objects are driven through a fluid using different spline interpolation methods. They say that seeing is believing;here we showcase the differences between linear and cubic spline interpolation using examples from fluid pumping and aquatic locomotion. Moreover, students can define their own interpolation functions and visualize the dynamics that unfold. To solve the fluid-structure interaction system, the open-source fluid dynamics software IB2d is used. In that spirit, all simulation codes, analysis scripts, and movies are provided for streamlined use.

关键词： numerical analysis education fluid dynamics education mathematical biology education immersed boundary method fluid-structure interaction biological fluid dynamics

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Projection Based Semi-Implicit Partitioned Reduced Basis Method for fluid-structure interaction Problems

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JOURNAL OF SCIENTIFIC COMPUTING 2023年第1期94卷 4-4页

作者： Nonino, Monica Ballarin, Francesco Rozza, Gianluigi Maday, Yvon Univ Vienna Dept Math Oskar Morgenstern Pl A-1090 Vienna Austria Univ Cattolica Sacro Cuore Dipartimento Matemat & Fis Via Garzetta I-25133 Brescia Italy Scuola Int Super Studi Avanzati MathLab Via Bonomea I-34136 Trieste Italy Univ Paris 06 Lab Jacques Louis Lions Pl Jussieu F-75005 Paris France

In this manuscript a POD-Galerkin based Reduced Order Model for unsteady fluid-structure interaction problems is presented. The model is based on a partitioned algorithm, with semi-implicit treatment of the coupling conditions. A Chorin-Temam projection scheme is applied to the incompressible Navier-Stokes problem, and a Robin coupling condition is used for the coupling between the fluid and the solid. The coupled problem is based on an Arbitrary Lagrangian Eulerian formulation, and the Proper Orthogonal Decomposition procedure is used for the generation of the reduced basis. We extend existing works on a segregated Reduced Order Model for fluid-structure interaction to unsteady problems that couple an incompressible, Newtonian fluid with a linear elastic solid, in two spatial dimensions. We consider three test cases to assess the overall capabilities of the method: an unsteady, non-parametrized problem, a problem that presents a geometrical parametrization of the solid domain, and finally, a problem where a parametrization of the solid's shear modulus is taken into account.

关键词： fluid-structure interaction Reduced basis method Segregated algorithm Proper orthogonal decomposition Incompressible fluid Elastic solid

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A fluid-structure interaction model for large wind turbines based on flexible multibody dynamics and actuator line method

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JOURNAL OF fluidS AND structureS 2023年第1期118卷

作者： Leng, Jun Gao, Zhiteng Wu, Michael C. H. Guo, Tao Li, Ye Shanghai Jiao Tong Univ Sch Naval Architecture Ocean & Civil Engn Multiple Funct Towing Tank Lab State Key Lab Ocean Engn Shanghai 200240 Peoples R China Brown Univ Sch Engn 184 Hope St Providence RI 02912 USA Ansys Inc Livermore CA 94551 USA Gansu Wind Technol Ctr Lanzhou 730050 Gansu Peoples R China

With higher demand of affordable electricity and rapid development of wind turbine technology, scale of wind turbines has been upsizing. As a consequence, blades grow longer and slender. Large geometrically nonlinear deformation and vibration of the blades lead to more challenges in the structural design. In the aerodynamic analysis, traditional blade element momentum theory cannot predict the complicated behavior of these modern blades while fully resolved Navier-Stokes equation methods cost much time modeling and refinement. To overcome these challenges, this paper proposes a new numerical method to analyze turbine aeroelastic performance and fluid-structure interaction based on flexible multibody dynamics and large eddy simulation with anisotropic actuator line method. By comparing the results with various existing numerical methods, we show that the newly proposed method can effectively predict the performance of the wind turbine, such as deformation and power output. We find that blade flexibility poses noticeable impact on the performance of large scale turbines in normal working conditions. The location of nascent vortex is postponed by blade deflection. The max difference between rigid and flexible blades in downstream velocity distributions reaches 10% and occurs at a radial distance around 0.55D. The new method also takes the fluid- structure coupling effect and momentum interaction into consideration and eliminates the non-physical oscillations caused by uncoupled methods. Also, blades deflection and vibration are found to accelerate momentum exchange, which facilitates the wake recovery process. Furthermore,compared to the rigid-blade model, the turbulent kinetic energy obtained by the newly developed flexible-blade model is higher in the lowfrequency region, in which large-scale vortices develop and the turbulent mixing effect is strong. This paper is expected to provide a framework for researchers and technology developers to design or estimate the per

关键词： fluid-structure interaction Aeroelastic analysis Large scale wind turbine Power prediction Geometrically exact beam theory Actuator line method

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fluid-structure interaction of a flexible rotor in water

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JOURNAL OF fluidS AND structureS 2021年 103卷 103259-103259页

作者： Eldemerdash, A. S. Leweke, T. Aix Marseille Univ IRPHE Cent Marseille CNRS F-13384 Marseille France

In this study, a moderately flexible rotor is investigated experimentally in a water channel. The rotor consists of a single blade with a simplified rectangular geometry and is tested with various pitch angles at different rotational speeds. The flapwise bending deformation and induced torsion of the blade are measured using image processing tools, and flow fields are extracted with Particle Image Velocimetry. The blade deformation behaviour depends strongly on the pitch angle, it includes extreme downstream and upstream bending for high negative and positive pitch, respectively. In addition, large-amplitude, low-frequency bending fluctuations are observed in a certain range of rotational speeds for negative pitch. The wake vorticity fields show large-scale recirculation zones being formed and intermittently shed behind the rotor, resembling the dynamics of the Vortex Ring State known from helicopter aerodynamics. A comparison with the flow generated by a rigid rotor of the same geometry is also carried out. (C) 2021 Elsevier Ltd. All rights reserved.

关键词： Flexible rotor fluid-structure interaction Particle Image Velocimetry Digital Image Correlation Vortex Ring State

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An explicit velocity correction-based immersed boundary-hybrid lattice Boltzmann flux solver for fluid-structure interaction with large solid deformation

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OCEAN ENGINEERING 2023年第1期270卷

作者： Yan, Haoran Zhang, Guiyong Rao, Honghua Song, Hong Sun, Zhe Dalian Univ Technol Sch Naval Architecture Engn State Key Lab Struct Anal Ind Equipment Dalian 116024 Peoples R China Collaborat Innovat Ctr Adv Ship & Deep Sea Explora Shanghai 200240 Peoples R China COSCO SHIPPING Heavy Ind Co Ltd Tech Inst Dalian 116113 Peoples R China Ocean Univ China Coll Engn Qingdao 266100 Peoples R China

In this work, an explicit velocity correction-based Immersed Boundary-Hybrid Lattice Boltzmann Flux Solver (IBHLBFS) is developed for fluid-structure interaction (FSI) problems with large solid deformation in twodimensional. The fluid domain is solved by the Lattice Boltzmann Flux Solver (LBFS) while the solid domain is solved by the Smoothed Point Interpolation Method (S-PIM). For coupling the two methods, the Explicit Velocity Correction (EVC) is developed and applied to both the fluid and the solid by implementing the Immersed Boundary Method (IBM). The fluid domain in IB-HLBFS can be discretized with non-uniform mesh so that the efficiency is improved meanwhile the accuracy is ensured compared with the original Lattice Boltzmann Method (LBM). Moreover, the explicit velocity correction simplifies the matrix inversion in the Implicit Velocity Correction (IVC) hence the efficiency is further improved. To show the advantages and the reliability of the present IB-HLBFS, the numerical simulations of flow past the elastic beam, flow past a circular cylinder with a flexible beam behind, and swimming of a self-propelled fishlike body are given to show the application of IBHLBFS in FSI with complex fluid dynamics and large solid deformation. The results indicate that the present method is advantageous in terms of efficiency and accuracy, and has a wide prospect in engineering applications as well.

关键词： Lattice Boltzmann flux solver Smoothed point interpolation method Immersed boundary method Explicit velocity correction fluid-structure interaction

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An Experimental Study of fluid-structure interaction in Collapsible Vessels

An Experimental Study of Fluid-Structure Interaction in Coll...

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作者： Schmeling, Jennifer Ida Alexandra North Dakota State University

学位级别：M.S., Master of Science/Master of Surgery

The fluid-structure interaction in collapsible thin-walled vessels is an important topic of research to better understand the physical mechanisms behind many physiological processes and diseases. In this work, we established an experimental setup to study the collapsible tube deformation and fluid-structure interaction within a thin-walled collapsible vessel. The effects of transmural pressure and flow rate were characterized experimentally using high-frequency pressure transducers and optical measurements. Various transmural pressures were also simulated through finite element analysis. Results suggest that the deformation of thin-wall vessel follows the pattern described by Shapiro’s tube law. The collapsed pattern and cross-sectional area changes with different transmural pressure and flow pressure gradients. Below a certain negative transmural pressure threshold, we observed self-induced oscillations whose frequency and magnitude are functions of flow rates. The critical non-dimensional parameter thresholds for self-induced oscillation and the related fluid flow behaviors were examined using Particle Image Velocimetry.

关键词： fluid-structure interaction Collapsible vessels

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APolygonal Discontinuous Galerkin Formulation for Contact Mechanics in fluid-structure interaction Problems

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Communications in Computational Physics 2021年第6期30卷 1-33页

作者： Stefano Zonca Paola FAntonietti Christian Vergara MOX Dipartimento di MatematicaPolitecnico di MilanoItaly LABS Dipartimento di ChimicaMateriali e Ingegneria Chimica“Giulio Natta”Politecnico di MilanoItaly

In this work,we propose a formulation based on the Polygonal Discontinuous Galerkin(PolyDG)method for contact mechanics that arises in fluid-structure interaction *** particular,we introduce a consistent penalization approach to treat the frictionless contact between immersed structures that undergo large *** key feature of the method is that the contact condition can be naturally embedded in the PolyDG formulation,allowing to easily support polygonal/polyhedral *** proposed approach introduced a fixed background mesh for the fluid problem overlapped by the structure grid that is able to move independently of the fluid *** assess the validity of the proposed approach,we report the results of several numerical experiments obtained in the case of contact between flexible structures immersed in a fluid.

关键词： Polygonal Discontinuous Galerkin method fluid-structure interaction contact mechanics

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A nodal position finite element model for fluid-structure interaction analysis of floating bodies with mooring

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OCEAN ENGINEERING 2023年第1期279卷

作者： Tonin, Mateus Guimaraes Braun, Alexandre Luis Univ Fed Rio Grande do Sul Programa Posgrad Engn Civil Av Osvaldo Aranha 99 BR-90035190 Porto Alegre RS Brazil

A numerical model based on the Nodal Position Finite Element Method (NPFEM) is proposed in this work for fluid-structure interaction (FSI) analysis of moored bodies subject to multiphase free surface flows. The semiimplicit CBS (Characteristic-Based Split) method is utilized here for discretization of the flow fundamental equations in the context of the Finite Element Method, where linear tetrahedral elements are adopted. Turbulence is analyzed using Large Eddy Simulation (LES) with the dynamic sub-grid scale model and the Level Set method is utilized for simulation of multiphase free surface flows. The structural system is modeled using a threedimensional rigid body approach for the floating object, while the mooring is discretized using a geometrically nonlinear cable formulation based on the NPFEM. A partitioned coupling scheme is adopted for fluid-structure interaction analysis taking into account the fluid-structure and cable-structure couplings, where the flow equations are kinematically described employing an Arbitrary Lagrangean-Eulerian (ALE) formulation with a numerical scheme for mesh motion. The algorithms constituting the numerical model are verified first considering classical applications on fluid dynamics and FSI, in addition to applications involving the dynamic analysis of cables. Finally, problems involving floating bodies with and without mooring are simulated to demonstrate the applicability and accuracy of the proposed numerical model.

关键词： Floating structures fluid-structure interaction Free surface flows Computational fluid dynamics CBS Method Nodal position finite element method

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