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Numerical and experimental fluid-structure interaction analysis of a flexible propeller

SHIP TECHNOLOGY RESEARCH 2023年第3期70卷 163-173页

作者： Fuentes, D. Hochbaum, A. Cura Schulze, R. Tech Univ Berlin Dynam Maritime Syst DMS Dept Muller Breslau Str 15 D-10623 Berlin Germany

The increasing interest in using flexible materials to design marine propellers, considering deformations due to flow loads. A numerical procedure for analysing two-way fluid-structure interactions, based on the commercial STAR-CCM+ multiphysics software, is described and applied to predict the hydroelastic response of the flexible marine propeller P1790 to hydrodynamic forces in open water conditions. The influence of the deformation on the performance of the flexible propeller was analysed by comparison with its rigid counterpart. The procedure has been validated by means of experiments performed in the cavitation tunnel K27 of the Technical University Berlin with both, the flexible and the rigid propeller. The predicted performance coefficients and the axial deformation of the blades agree well with measured values. This suggests the feasibility of using the passive bending and twisting behaviour of a flexible propeller to adapt the pressure distribution on the blade to improve the propeller performance over a range of advance ratios.

关键词： fluid-structure interaction hydroelastic response flexible propellers open water test Reynolds-averaged Navier-Stokes Computational fluid Dynamics Experimental measurements Finite Element Method

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Fast Isogeometric Method for fluid-structure interaction Simulation of Heart Valves with GIFT Framework

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COMMUNICATIONS IN MATHEMATICS AND STATISTICS 2023年 1-25页

作者： Ma, Shuhao Xu, Jinlan Xu, Gang Hangzhou Dianzi Univ HDU ITMO Joint Inst Hangzhou Zhejiang Peoples R China Hangzhou Dianzi Univ Sch Comp Sciece & Technol Hangzhou Zhejiang Peoples R China

In order to improve the efficiency of heart valve simulation, we proposed a fast iso-geometric simulation approach for time-dependent heart valve simulation algorithm with the idea of Geometric-Independent Field approximation (GIFT for short). For the solution of the blood flow field problem in a heart valve, the fluid background mesh is first simplified, then a Bezier tetrahedral mesh is generated based on the simplified mesh to maintain geometric precision, and finally, the fluid velocity field and pressure are solved. In addition, the GIFT idea is used to represent the geometry of computational domain geometry and approximate the physical field solution with different basis function spaces to obtain the numerical solution with the same preci-sion as before simplification. In the structural mechanics simulation of valve leaflets, NURBS surfaces are used to represent the geometric model. To avoid degeneration on geometric boundary, a single leaflet geometric patch is subdivided into four patches. The immersion geometry strategy is adopted in solving the deformation problem of cardiac valve leaflets to achieve high simulation precision, and the dynamic augmented Lagrangian algorithm is used to couple fluid-structure control equations. For the time discretization, the generalized a method is used to control high-frequency dissipation. Numerical examples and comparisons with previous methods are also presented. The proposed algorithm can reduce the computing costs by about 54.3%, which proves the effectiveness of the proposed method.

关键词： Isogeometric analysis fluid-structure interaction Heart valve simulation Bezier tetrahedra

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fluid-structure interaction with a Finite Element-Immersed Boundary approach for compressible flows

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OCEAN ENGINEERING 2023年 290卷

作者： Morales, Freddy Alejandro Portillo Serfaty, Ricardo Vedovotto, Joao Marcelo Cavallini Jr, Aldemir Villar, Millena Martins da Silveira Neto, Aristeu Univ Fed Uberlandia Ave Joao Naves Avila 2121 BR-38108100 Uberlandia MG Brazil Centro Ave Henrique Valadares28 Ctr BR-20231030 Rio De Janeiro RJ Brazil

This paper presents the mathematical modeling and numerical simulations of fluid-structure interaction (FSI) problems. The fluid domain is discretized using a Cartesian block-structured mesh and solved using the Finite Volume Method (FVM), using the LES methodology with Smagorinsky turbulent closure model. The fluid flow in the system is considered compressible, with properties that vary. The Immersed Boundary Method (IBM) is used to model the solid-fluid interface, and the structure deformation was solved using the Finite Element Method (FEM). The Multi-direct Forcing Scheme is used to calculate the fluid-dynamics forces through the IBM. After calculating the fluid forces exerted on the solid, the forces are interpolated and transferred to the FEM model, providing the deformation of the structure at each time step. The structural domain was discretized with Hexahedral eight-noded element with extra shape functions. The simulations were carried out using MFSIm (in-house code), a multiphysics simulation framework developed by the fluid Mechanics Laboratory of the Federal University of Uberlandia with financial support from Petrobras. This paper demonstrates the practical application of FSI analysis in an industrial context, specifically focusing on a pipeline system within a fluid Catalytic Cracking Unit (FCCU) used in the oil and gas industry. The analysis involves the use of butterfly valves positioned at different angles of opening. The results are treated statistically, and a surface response is generated. Machine learning is employed to predict the surface response, showing the valve configurations that yield the maximum and minimum displacement magnitudes of the evaluated structural probes.

关键词： fluid-structure interaction Finite Element Method Finite Volume Method Immersed Boundary Compressible flow

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On a fluid-structure interaction problem for plaque growth

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NONLINEARITY 2023年第1期36卷 537-583页

作者： Abels, Helmut Liu, Yadong Univ Regensburg Fak Math D-93053 Regensburg Germany

We study a free-boundary fluid-structure interaction problem with growth, which arises from the plaque formation in blood vessels. The fluid is described by the incompressible Navier-Stokes equations, while the structure is considered as a viscoelastic incompressible neo-Hookean material. Moreover, the growth due to the biochemical process is taken into account. Applying the maximal regularity theory to a linearization of the equations, along with a deformation mapping, we prove the well-posedness of the full nonlinear problem via the contraction mapping principle.

关键词： fluid-structure interaction two-phase flow growth free boundary value problem maximal regularity Primary Secondary

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Analysis of the Influence of the Blade Deformation on Wind Turbine Output Power in the Framework of a Bidirectional fluid-structure interaction Model

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fluid Dynamics & Materials Processing 2023年第5期19卷 1129-1141页

作者： Ling Yuan Zhenggang Liu Li Li Ming Lin CHN Energy United Power Technology Co. Ltd.Beijing100036China School of Energy and Power Engineering Shandong UniversityJinan250061China School of Renewable Energy North China Electric Power UniversityBeijing102206China

The blades of large-scale wind turbines can obviously deform during operation,and such a deformation can affect the wind turbine’s output power to a certain *** order to shed some light on this phenomenon,for which limited information is available in the literature,a bidirectional fluid-structure interaction(FSI)numerical model is employed in this *** particular,a 5 MW large-scale wind turbine designed by the National Renewable Energy Laboratory(NREL)of the United States is considered as a *** research results show that blades’deformation can increase the wind turbine’s output power by 135 kW at rated working *** with the outcomes of the simulations conducted using the model with no blade deformation,the results obtained with the FSI model are closer to the experimental *** is concluded that the bidirectional FSI model can replicate the working conditions of wind turbines with great fidelity,thereby providing an effective method for wind turbine design and optimization.

关键词： Wind turbine fluid-structure interaction numerical simulation blade

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Static aeroelasticity analysis of a rotor blade using a Gauss-Seidel fluid-structure interaction method

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Advances in Aerodynamics 2023年第1期5卷 478-496页

作者： Jiaxing Li Jiaqi Luo Yaolong Liu Zhonghua Han School of Aeronautics and Astronautics Zhejiang UniversityHangzhou 310027China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China

The present study introduces a Gauss-Seidel fluid-structure interaction(FSI)method including the flow solver,structural statics solver and a fast data transfer technique,for the research of structural deformation and flow field variation of rotor blades under the combined influence of steady aerodynamic and centrifugal *** FSI method is illustrated and validated by the static aeroelasticity analysis of a transonic compressor rotor blade,NASA Rotor *** improved local interpolation with data reduction(LIWDR)algorithm is introduced for fast data transfer on the fluid-solid interface of *** results of FSI calculation of NASA Rotor 37 show that when compared with the radial basis function(RBF)based interpolation algorithm,LIWDR meets the interpolation accuracy requirements,while the calculation cost can be greatly *** data transmission time is only about 1%of that of ***,the iteration step of steady flow computation within one single FSI has little impact on the converged aerodynamic and structural *** aerodynamic load-caused deformation accounts for nearly 50%of the *** effects of blade deformation on the variations of aerodynamic performance are given,demonstrating that when static aeroelasticity is taken into account,the choke mass flow rate increases and the peak adiabatic efficiency slightly *** impact mechanisms on performance variations are presented in detail.

关键词： fluid-structure interaction Rotor blade Static aeroelasticity Data transfer aerodynamic performance

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CONSTRUCTION AND VALIDATION OF A TWO-WAY fluid-structure interaction SOLVER UNDER AN OPEN-SOURCE FRAMEWORK 43

CONSTRUCTION AND VALIDATION OF A TWO-WAY FLUID-STRUCTURE INT...

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

作者： Sun, Jia-Yu Sun, Shi-Li Wang, Shuang Harbin Engn Univ Coll Shipbldg Engn Harbin Peoples R China Int Lab Naval Architecture & Offshore Technol Har Harbin Peoples R China

ISBN: (纸本)9780791887844

The fluid-structure interaction (FSI) issue is a complex and nonlinear process involving the interaction between a deformed structure and the surrounding fluid. In this work, we developed a novel high-fidelity, modular, open-source and user-friendly FSI simulation framework by coupling the well-established fluid solver OpenFOAM (R) with the structure solver CalculiX. The fluid solver solves unsteady RANS equations using a finite volume method on unstructured meshes. The hydrodynamic loads on the surfaces of the object are then passed to structural solver. The displacements and structural response of the object are efficiently computed and exchanged with the fluid solver through a finite element analysis. The coupling was implemented through the preCICE coupling library for partitioned multi-physics simulations, which treats the two dedicated solvers as 'black boxes' and provides data mapping between non-matching meshes. Two classical FSI test cases are presented, and the numerical results are compared with previously published laboratory tests and benchmark data, achieving a satisfactory agreement. This work provides an efficient tool under the open-source framework for fluid-structure interaction simulation.

关键词： fluid-structure interaction Two-way coupling CFD FEA

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Definition and calculation method of modal effective mass of asymmetric fluid-structure interaction system for seismic analysis

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NUCLEAR ENGINEERING AND TECHNOLOGY 2023年第12期55卷 4307-4316页

作者： Heo, Yong-Hwa Sun, Jong-Oh Kim, Gyeong Ho Choo, Yeonseok Korea Atom Energy Res Inst Daedeok Daero 989Beon-Gil Daejeon 34057 South Korea

In this paper, modal effective mass for asymmetric fluid-structure interaction system is defined and equations for its calculation is derived. To establish consistency, modal effective mass in symmetric structure only system is briefly reviewed, followed by a definition of the modal effective mass in asymmetric system. The equations for calculating modal effective mass in asymmetric system are derived by utilizing the properties of left and right eigenvectors. To simplify the equations, the assumption is made that the mass matrix is only affected by the fluid. The simplified equation is then compared to the equation already used in ANSYS. Finally, the validity of the modal effective mass definition and derivation in this paper is demonstrated through a simple example.

关键词： Modal effective mass Asymmetric system fluid-structure interaction Modal analysis Seismic analysis

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fluid-structure interaction simulation of a flapping flag in a laminar jet

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JOURNAL OF fluidS AND structureS 2023年第1期119卷

作者： Nawafleh, Anas Xing, Tao Durgesh, Vibhav Padilla, Rodrigo Univ Idaho 875 Perimeter Dr Moscow ID 83844 USA

The flapping flag is a classical and important fluid-structure interaction (FSI) problem with many applications in nature, industry, and biological systems. However, the interaction between the flow field and the flag response is not fully understood due to the complex and nonlinear nature of the problem. Although theoretical models qualitatively predict the flapping frequency and the onset velocity, there are still quantitative discrepancies between the theoretical predictions and the experimental data. In this study, numerical FSI simulations of a standard flag in a viscous uniform laminar flow are performed to characterize the flow field around the flapping flag and correlate the flow field with the flag response for six Reynolds numbers (Re = 4.5 x104, Re = 5.3 x104, Re = 5.7 x104, Re = 5.9 x104, Re = 6.6 x104, and Re = 7.5 x104). Two-way coupled FSI simulations are conducted using commercial software ANSYS (R). Rigorous solution verification is conducted first on three Re to ensure that solutions are independent of mesh and time-step refinement. Then validation is achieved by comparing the simulation predictions with experimental data. Overall, results showed a good agreement with an error range between 0.7%-4.7% for oscillation amplitude (Am), 1.3%-6.41% for drag coefficient (Cd), and 1.3%-5.3% for frequency (f ). Moreover, a comparison between inviscid and viscous models is performed to evaluate the accuracy of using inviscid theoretical models for the same flow. It is observed that the inviscid model accurately predicted f but underpredicted Am and Cd, and overpredicted lift coefficient Cl. In the case of the viscous model, it is observed that a flow separation bubble and a thin flow circulation region exist on the suction side of the flag during the limit cycle oscillation (LCO). Finally, an instantaneous negative drag is observed for a short time during the LCO, suggesting that flag reconfiguration and flow separation significantly affects the drag. These

关键词： Flapping Flag fluid-structure interaction Simulation

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A Numerical Study of the Effect of Elasticity on the Strength of Rotor Blades Using the fluid-structure interaction Method 10th

A Numerical Study of the Effect of Elasticity on the Strengt...

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10th International Conference on Design and Modeling of Mechanical Systems (CMSM)

作者： Fakhfekh, Marwa Ben Amira, Wael Abid, Malek Maalej, Aref Univ Sfax US Natl Sch Engineers Sfax ENIS Lab Electromech Syst LASEM BP 1173Rd Soukra Km 3-5 Sfax 3038 Tunisia Aix Marseille Univ CNRS IRPHE UMR 7342Cent Marseille F-13384 Marseille France Univ Johannesburg Dept Elect & Elect Engn Sci ZA-2006 Johannesburg South Africa

ISBN: (纸本)9783031671517;9783031671524

This paper presents a numerical study based on fluid-structure interaction (FSI) to analyze the impact of elasticity on the resistance of the rotor blade in terms of maximum stress. Simulations, conducted using Ansys Workbench software, implement a strong coupling between fluid dynamics and transient structure. The obtained results allow us to explore the combined influence of elasticity and flow parameters on blade resistance. As a result, we present the variation of maximum stress for different inflow velocities and different rotation frequencies for rigid and flexible cases. Our findings highlight the significant effect of flexibility in reducing structural stresses, emphasizing the marked influence of rotation frequency on the evolution of these stresses compared to the rigid case.

关键词： fluid-structure interaction Rotation frequency elasticity stress

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