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A coupled high-accuracy phase-field fluid-structure interaction framework for Stokes fluid-filled fracture surrounded by an elastic medium

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RESULTS IN APPLIED MATHEMATICS 2024年 22卷

作者： von Wahl, Henry Wick, Thomas Univ Vienna Fac Math Oskar Morgenstern Pl 1 A-1090 Vienna Austria Friedrich Schiller Univ Jena Inst Math Ernst Abbe Pl 2 D-07743 Jena Germany Leibniz Univ Hannover Inst Appl Math Welfengarten 1 D-30167 Hannover Germany

In this work, we couple a high-accuracy phase-field fracture reconstruction approach iteratively to fluid-structure interaction. The key motivation is to utilise phase-field modelling to compute the fracture path. A mesh reconstruction allows a switch from interface-capturing to interface- tracking in which the coupling conditions can be realised in a highly accurate fashion. Consequently, inside the fracture, a Stokes flow can be modelled that is coupled to the surrounding elastic medium. A fully coupled approach is obtained by iterating between the phase-field and the fluid-structure interaction model. The resulting algorithm is demonstrated for several numerical examples of quasi-static brittle fractures. We consider both stationary and quasi-stationary problems. In the latter, the dynamics arise through an incrementally increasing given pressure.

关键词： Phase-field fracture fluid-structure interaction Interface reconstructions Finite elements Sneddon's benchmark

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fluid-structure interaction for the flexible filament's propulsion hanging in the free stream

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JOURNAL OF MOLECULAR LIQUIDS 2021年 323卷 114941-114941页

作者： Afra, B. Delouei, A. Amiri Mostafavi, M. Tarokh, A. Lakehead Univ Fac Sci & Environm Studies Thunder Bay ON Canada Univ Bojnord Dept Mech Engn Bojnord Iran Shahrood Univ Technol Dept Mech Engn Shahrood Iran Lakehead Univ Dept Mech Engn Thunder Bay ON Canada

In this study, a successful hybrid model is presented for the simulation of flow induced vibrations. The novel fluid-structure interaction framework relies on split-forcing Lattice Boltzmann Method (LBM) and Immersed Boundary Method (IBM), which are combined with a novel explicit Lattice Spring Model (LSM). The solver is validated against two benchmarks which include fluid interacting with a rigid cylinder and a finned circle attached in the middle of a channel. The role of flexibility on the filaments flapping in a free-stream at different Reynolds numbers is investigated. It is found that for a single filament flapping in a fluid flow, increasing flexibility do not always increases vibration amplitudes and can surprisingly decrease fluctuations if flexibility exceed a specific value. This interplay stems from flapping frequencies as they approach the natural frequency of the filament, creating resonance. Also, fluid structure interaction of three side-by-side filaments with different separate distancing values Dp/L in the free-stream are studied in the results section. The data highlights that for the Dp/L < 0.2 case, filaments act as a single filament while larger values form diffuser and nozzle shapes, which affect the fluid flow acceleration. Finally, we investigate the effects of separation distance has for the case in which filaments are arranged linearly. It is found that filaments can be synchronized to propel in phase with the same frequency if particular gaps are considered between filaments. (C) 2020 Elsevier B.V. All rights reserved.

关键词： Flexible filaments fluid-structure interaction Numerical methods development Flow-induced vibration

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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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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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Structural optimization of H-type VAWT blade under fluid-structure interaction conditions

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JOURNAL OF VIBROENGINEERING 2021年第5期23卷 1207-1218页

作者： Zhang, Xu Wang, Zituo Li, Wei Tiangong Univ Tianjin Key Lab Adv Mechatron Equipment Technol Tianjin 300387 Peoples R China Tianjin Chengjian Univ Sch Energy & Safety Engn Tianjin 300384 Peoples R China

To reduce the errors caused by the rigid body hypothesis in the aerodynamics-structure coupling calculation and improve the structural performance, an optimum structure design with the consideration of the fluid-structure interaction are performed for the H-type vertical axis wind turbine (VAWT) blade. Based on the ANSYS Workbench platform, the geometric model, computational domain and grids of the wind wheel are constructed, the turbulence model, boundary conditions and composite material layers are set up, and the fluid and solid domains are solved in a coupled way. The single-objective structural optimization model in which the thicknesses of glass clothes, foam and gel coat, and the positions of two webs are taken as design variables is solved using the response surface optimization method to minimize the wind wheel mass. The frequencies and vibration modes of original and optimized blades with and without pre-stress and the transient characteristics of wind wheels in different wind speeds are investigated. The results indicate that after the blade optimization, the first-order frequency and critical speed become larger and other frequencies reduce for the static, single pre-stress and multiple pre-stresses states, and the maximum displacement, stress and strain of the wind wheel decrease under rated and extreme wind speeds, confirming significant performance improvements. The research provides useful guidance for the integrated design of structure and aerodynamics of wind turbine blades.

关键词： H-type vertical axis wind turbine blade structural optimization fluid-structure interaction

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LES simulation study of wind turbine aerodynamic characteristics with fluid-structure interaction analysis considering blade and tower flexibility

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ENERGY 2023年第1期282卷

作者： Zhang, Dongqin Liu, Zhenqing Li, Weipeng Hu, Gang Harbin Inst Technol Sch Civil & Environm Engn Shenzhen 518055 Peoples R China Huazhong Univ Sci & Technol Sch Civil & Hydraul Engn Wuhan 430074 Hubei Peoples R China Huazhong Univ Sci & Technol Natl Ctr Technol lnnovat Digital Construct Wuhan Hubei Peoples R China CGN New Energy Holdings Co Ltd Beijing Peoples R China

As wind turbine blades become longer and more flexible, aerodynamic characteristics become increasingly complex and require complete investigations. In this study, a two-way fluid-structure interaction (FSI) model is proposed to analyze the effects of inflow conditions, including uniform and atmospheric boundary layer (ABL) winds, as well as blade and tower flexibility, on the aerodynamic characteristics of wind turbine blades. A 4.5 MW real wind turbine with the rotor diameter of 152 m and the hub height of 94 m is considered. Results show that the edgewise blade motion can be disregarded, while the motion of the tower and the flap-wise motion of blade significantly influence the aerodynamic characteristics of blades. The separation flow at the blade root suction side is more distinct and becomes less significant with an increase in spanwise distance, with stagnation points primarily distributed along the flow separation boundary at 0.45-0.95L (L is the blade length). The threedimensional rotational effect of the blade induces notable fluctuations in the pulsating pressure coefficient, particularly within this region. Notably, a prominent peak is observed at the location of 0.65L. Consequently, it is recommended to allocate additional focus on this specific region to mitigate potential fatigue loads.

关键词： LES simulation Wind turbine Aerodynamic characterises fluid-structure interaction Blade and tower flexibility

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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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fluid-structure interaction effects on the deformable and pitching plate dynamics in a fluid flow

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APPLIED OCEAN RESEARCH 2021年 113卷 1页

作者： Brousseau, Paul Benaouicha, Mustapha Guillou, Sylvain Segula Technol Naval & Energy Engn Res & Innovat Unit 19 Rue Arras F-92000 Nanterre France Univ Caen Normandy Cherbourg Univ Lab Appl Sci LUSAC 60 Rue Max Pol Fouchet F-50130 Octeville France

This study presents a numerical investigation of a 2D flexible flat plate dynamics, immersed in a fluid flow with a Reynolds number, based on its chord, of 2000. The plate is animated by a forced sinusoidal pitching movement, whose amplitude is 10 circle from its leading edge. Various materials are considered for the structure, from rigid materials to more flexible ones. The fluid-structure interaction (FSI) effects are taken into account using a partitioned implicit coupling scheme. The Arbitrary Lagrangian-Eulerian (ALE) formulation of the Navier-Stokes equations is applied and the anisotropic diffusion equation is solved to determine the displacements of the fluid domain mesh. The numerical results are validated with experimental ones. A good agreement with the experimental results is obtained. Afterwards, it is shown that under the considered dynamics of the plate, the flexibility of the structure tends to increase the lift and the drag but decrease the thrust. In addition, this produces an acceleration of the fluid flow in the wake of the plate.

关键词： fluid-structure interaction Strong coupling Numerical simulation Flexible flat plate dynamics Pitching movement Hydrodynamic load

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fluid-structure interaction: Insights into biomechanical implications of endograft after thoracic endovascular aortic repair

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COMPUTERS IN BIOLOGY AND MEDICINE 2021年 138卷 104882-104882页

作者： Qiao, Yonghui Mao, Le Ding, Ying Zhu, Ting Luo, Kun Fan, Jianren Zhejiang Univ State Key Lab Clean Energy Utilizat 38 Zheda Rd Hangzhou 310027 Peoples R China Fudan Univ Zhongshan Hosp Dept Vasc Surg Shanghai Peoples R China Fudan Univ Zhongshan Hosp Dept Radiol Shanghai Peoples R China

Thoracic endovascular aortic repair (TEVAR) has developed to be the most effective treatment for aortic diseases. This study aims to evaluate the biomechanical implications of the implanted endograft after TEVAR. We present a novel image-based, patient-specific, fluid-structure computational framework. The geometries of blood, endograft, and aortic wall were reconstructed based on clinical images. Patient-specific measurement data was collected to determine the parameters of the three-element Windkessel. We designed three postoperative scenarios with rigid wall assumption, blood-wall interaction, blood-endograft-wall interplay, respectively, where a two-way fluid-structure interaction (FSI) method was applied to predict the deformation of the composite stentwall. Computational results were validated with Doppler ultrasound data. Results show that the rigid wall assumption fails to predict the waveforms of blood outflow and energy loss (EL). The complete storage and release process of blood flow energy, which consists of four phases is captured by the FSI method. The endograft implantation would weaken the buffer function of the aorta and reduce mean EL by 19.1%. The closed curve area of wall pressure and aortic volume could indicate the EL caused by the interaction between blood flow and wall deformation, which accounts for 68.8% of the total EL. Both the FSI and endograft have a slight effect on wall shear stress-related-indices. The deformability of the composite stent-wall region is remarkably limited by the endograft. Our results highlight the importance of considering the interaction between blood flow, the implanted endograft, and the aortic wall to acquire physiologically accurate hemodynamics in post-TEVAR computational studies and the deformation of the aortic wall is responsible for the major EL of the blood flow.

关键词： Thoracic endovascular aortic repair Aortic endograft Windkessel model fluid-structure interaction Computational fluid dynamics

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fluid-structure interaction of thin flexible bodies in multi-material multi-phase systems

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JOURNAL OF COMPUTATIONAL PHYSICS 2021年 429卷 110008-110008页

作者： Vahab, Mehdi Sussman, Mark Shoele, Kourosh Florida State Univ Tallahassee FL 32306 USA

A numerical approach for the modeling and simulation of fluid-structure interaction (FSI) in multi-material and multi-phase systems with potential phase-changes dynamics is presented. The boundary conditions at the interface between the fluids and structures are enforced using an immersed boundary technique to couple the Eulerian multi-material solver to the Lagrangian structural solver and maintain the solution algorithm's efficiency. The phase-change dynamics are modeled to consider the volume expansion/shrinkage due to the density difference in materials. The algorithm for material phase-change includes a sub-grid model near triple points and benefits from the volume-conservative continuous moment-of-fluid (CMOF) reconstruction method for smooth material domain representation. A systematic stability criterion for the coupled problems with the proposed FSI technique is derived, and the accuracy of the method is verified and tested with multiple canonical problems. The technique is employed to explore the effects of the active vortex generation of a flapping plate on the momentum and thermal dynamics of the nucleate pool boiling phenomenon in a cross-flow in two and three-dimensional setups. (C) 2020 Elsevier Inc. All rights reserved.

关键词： fluid-structure interaction Multi-phase flow Phase-change Boiling process Thin structure

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