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Modeling fluid-structure interaction using smoothed particle hydrodynamics and constitutively informed particle dynamics

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COMPUTERS & fluidS 2024年 276卷

作者： Paravastu, Phanindra Vedantam, Srikanth Indian Inst Technol Madras Dept Engn Design Chennai 600036 India

In this paper, we present a novel fluid-structure interaction framework based on the smoothed particle hydrodynamics model for fluids and a recently developed constitutively informed particle dynamics model for solids. We develop a new method for coupling these approaches to expand the fluid-structure simulation framework to include crack propagation failure in the solid. Several benchmark problems have been simulated to validate the fluid and solid models separately as well as the coupled model. We then apply this coupled approach to model brittle failure of a notched bar impacted by a fluid. We study the effect of various parameters such as height of the obstacle and location of the notch on its fracture.

关键词： fluid-structure interaction Smoothed particle hydrodynamics Particle based methods

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Condensation solution method for fluid-structure interaction dynamic models of structural system

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JOURNAL OF fluidS AND structureS 2024年 131卷

作者： Hu, Yu Song, Zhiguang Carrera, Erasmo Harbin Engn Univ Coll Aerosp & Civil Engn Harbin 150001 Peoples R China Politecn Torino Dept Mech & Aerosp Engn Corso Duca Abruzzi 24 I-10129 Turin Italy

In the fluid-structure dynamic analysis, the low solution efficiency seriously restricts the passive and active vibration control of structures. But so far, this issue has not been well addressed. Component mode synthesis (CMS) is an efficient method for dynamic analysis of structures. However, since the concept of mode for the fluid is very weak, the CMS is not suitable for solving fluid-structure interaction dynamic problems. Another type of dimension reduction method is dynamic condensation originating from Guyan method. In this paper, introducing the idea of CMS and combining the Guyan method, an efficient condensation solution method is proposed to solve the fluid-structure interaction dynamic models. In the dynamical modeling, both the structure field and fluid field are discretized using 20-node three dimensional elements. The elemental fluid-structure interaction equations of motion are formulated using the Hamilton principle and weighted residual method. The solid and fluid fields are divided into substructures, and all the degrees of freedom (DOFs) of the two fields are divided into interior structure DOFs, boundary structure DOFs, interior master fluid DOFs, interior salve fluid DOFs, as well as boundary fluid DOFs. In the solid substructures, higher orders of mode are neglected to realize a large-scale dimensional reduction, while for the fluid field, the slave DOFs are replaced by the master DOFs. To conduct the verification of the present method, experiment is carried out. The comparison results show the high accuracy and efficiency of the condensation solution method.

关键词： Wet mode fluid-structure interaction Component mode synthesis Finite element method Guyan method

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A coupled SPH-SPIM solver for fluid-structure interaction with nonlinear deformation

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2024年 427卷

作者： Yang, Xi Liang, Guangqi Zhang, Guiyong Zhang, Zhifan Sun, Zhe Dalian Univ Technol Sch Naval Architecture State Key Lab Struct Anal Optimizat & CAE Software Dalian 116024 Peoples R China Collaborat Innovat Ctr Adv ship & Deep Sea Explora Shanghai Peoples R China

A robust fluid-structure interaction (FSI) model based on smoothed particle hydrodynamics (SPH) and smoothed point interpolation method (SPIM) is developed in this work. The fluid is solved by the stable and accurate delta+-SPH scheme. The solid is simulated by the edge-based SPIM (ESPIM) which can soften the numerical stiffness by utilizing the generalized gradient smoothing technique. The interaction between the fluid and structure is realized with the help of virtual particles and the pressure integral method. Virtual particles are pre-set inside the solid and they keep with the structure nodes. The fluid exerts external forces on the solid by integrating the pressure alongside the solid boundary segments. In this way, the fluid and solid are free to be discretized with different spatial resolutions. The fluid, solid and FSI solvers are respectively verified. In the situations of complex FSI problems like sloshing, dam-breaking and impacting, the present model performs well in predicting the fluid fields and structural deformations. The obtained results are in good agreement with the reference solutions, which proves its ability.

关键词： fluid-structure interaction delta+SPH ESPIM Nonlinear deformation Interface/free surface

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Computational fluid-structure interaction in Microfluidics

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MICROMACHINES 2024年第7期15卷 897-897页

作者： Musharaf, Hafiz Muhammad Roshan, Uditha Mudugamuwa, Amith Trinh, Quang Thang Zhang, Jun Nguyen, Nam-Trung Griffith Univ Queensland Micro & Nanotechnol Ctr Brisbane Qld 4111 Australia Griffith Univ Sch Engn & Built Environm Brisbane Qld 4111 Australia

Micro elastofluidics is a transformative branch of microfluidics, leveraging the fluid-structure interaction (FSI) at the microscale to enhance the functionality and efficiency of various microdevices. This review paper elucidates the critical role of advanced computational FSI methods in the field of micro elastofluidics. By focusing on the interplay between fluid mechanics and structural responses, these computational methods facilitate the intricate design and optimisation of microdevices such as microvalves, micropumps, and micromixers, which rely on the precise control of fluidic and structural dynamics. In addition, these computational tools extend to the development of biomedical devices, enabling precise particle manipulation and enhancing therapeutic outcomes in cardiovascular applications. Furthermore, this paper addresses the current challenges in computational FSI and highlights the necessity for further development of tools to tackle complex, time-dependent models under microfluidic environments and varying conditions. Our review highlights the expanding potential of FSI in micro elastofluidics, offering a roadmap for future research and development in this promising area.

关键词： micro elastofluidics fluid-structure interaction computational methods microdevices cardiovascular modelling

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Dynamic Characteristics of Pressure-Balanced Metal Bellows in fluid-structure interaction

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INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS 2024年第0期

作者： Wei, Yuhan Ge, Shaoxiang Hu, Feng Xue, Xin Fuzhou Univ Sch Mech Engn & Automat Fuzhou Peoples R China

As a flexible component in high-pressure vessels and pipeline systems, bellows experience significant fluid-structure interaction effects under high-speed internal fluids and external vibrations. Nevertheless, their dynamic response mechanisms coupled with fluid-structure interaction mentioned below have not yet been clarified so far. In this work, a novel pressure-balanced metal bellow (PBMB) for low-stiffness and high-pressure resistance is firstly proposed. Several fluid-structure interaction models were considered to study the dynamic response characteristics of the PBMB. An experimental platform associated with fluid-structure interaction was established to validate the effectiveness of its vibration attenuation performance. The results indicate that the PBMB has an obvious vibration attenuation effect in the range of 5-90Hz, and super-harmonic and sub-harmonic resonance phenomena occur in the range of 90-200Hz. Under constant fluid conditions, fluid density, viscosity, flow velocity, and pressure are positively correlated with the response amplitude of the PBMB. The response of the PBMB oscillates at the fluid entry point due to both pulsating flow velocity and pulsating pressure. After several cycles, the response caused by pulsating flow velocity gradually decays and stabilizes. Thus, the impact of pulsating frequency on the stability of the response of bellows is insignificant during the initial cycles.

关键词： Pressure-balanced metal bellows dynamic characteristics fluid medium fluid-structure interaction

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fluid-structure interaction of flexible submerged vegetation stems and kinetic turbine blades

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COMPUTATIONAL PARTICLE MECHANICS 2020年第5期7卷 839-848页

作者： Wang, Mingyang Avital, Eldad J. Bai, Xin Ji, Chunning Xu, Dong Williams, John J. R. Munjiza, Antonio Queen Mary Univ London Sch Engn & Mat Sci London England Tianjin Univ State Key Lab Hydraul Engn Simulat & Safety Tianjin Peoples R China Split Univ Dept Civil Engn FGAG Split Croatia

A fluid-structure interaction (FSI) methodology is presented for simulating elastic bodies embedded and/or encapsulating viscous incompressible fluid. The fluid solver is based on finite volume and the large eddy simulation approach to account for turbulent flow. The structural dynamic solver is based on the combined finite element method-discrete element method (FEM-DEM). The two solvers are tied up using an immersed boundary method (IBM) iterative algorithm to improve information transfer between the two solvers. The FSI solver is applied to submerged vegetation stems and blades of small-scale horizontal axis kinetic turbines. Both bodies are slender and of cylinder-like shape. While the stem mostly experiences a dominant drag force, the blade experiences a dominant lift force. Following verification cases of a single-stem deformation and a spinning Magnus blade in laminar flows, vegetation flexible stems and flexible rotor blades are analysed, while they are embedded in turbulent flow. It is shown that the single stem's flexibility has higher effect on the flow as compared to the rigid stem than when in a dense vegetation patch. Making a marine kinetic turbine rotor flexible has the potential of significantly reducing the power production due to undesired twisting and bending of the blades. These studies point to the importance of FSI in flow problems where there is a noticeable deflection of a cylinder-shaped body and the capability of coupling FEM-DEM with flow solver through IBM.

关键词： fluid-structure interaction FEM-DEM Immersed boundary method Submerged vegetation Kinetic turbine blades

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Study on the Structural Characteristics of Bulb Tubular Pumps Based on fluid-structure interaction

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PROCESSES 2024年第8期12卷 1641页

作者： Wang, Wenjie Li, Jingyu Wu, Chunhui Pei, Ji Luo, Can Hu, Bo Jiangsu Univ Res Ctr Fluid Machinery Engn & Technol Zhenjiang 212013 Peoples R China Power China Guiyang Engn Corp Ltd Guiyang 550081 Peoples R China Gen Irrigat Canal Management Off Jiangsu Prov Huaian 223001 Peoples R China Yangzhou Univ Engn Res Ctr High Efficiency & Energy Saving Large Yangzhou 225009 Peoples R China Tsinghua Univ Dept Energy & Power Engn Beijing 100084 Peoples R China

As a special type of through-flow device, bulb turbine pumps have been widely used in the Eastern Route of the South-to-North Water Diversion Project due to their compact structure, flexible installation process, easy maintenance, high efficiency, and strong adaptability. Therefore, structural improvements to enhance their safety and stability through fluid-structure interaction analysis have significant engineering value. This paper conducts static and transient fluid-structure interaction analyses of the bulb turbine pump structure. The results show that the rotor structure experiences the greatest deformation under low-flow conditions, with maximum deformation (2.13 mm) occurring at the leading edge of the impeller inlet and decreasing radially along a gradient distribution. The damping effect of water changes the mode shapes of the rotor structure, and although the vibration modes under wet conditions are similar to those in the air, the frequencies decrease to varying degrees. In transient analyses under different conditions, the total deformation of the rotor system is greater than in static analyses, showing significant regularity. Under low-flow conditions, the deformation of the pressure surface at the inlet and outlet of the blade tip is greater than that of the suction surface, with a maximum total deformation of 3.656 mm. The maximum total deformation under design flow is 3.337 mm;under high flow, it is 2.646 mm. The total deformation of the casing mainly occurs on both sides of the internal bulb body bottom support, with a maximum deformation of 2.0355 mm and an equivalent stress maximum of 44.848 MPa. The equivalent stress and total deformation distribution of the support structure are similar, located at the top support and trailing edge, with a maximum value of 22.94 MPa at the trailing edge. The research results provide technical references and theoretical foundations for the structural optimization of bulb turbine pumps.

关键词： bulb tubular pump fluid-structure interaction structural strength modal analysis

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Mock-up conception for experimentally investigate the creep phenomenon caused by the fluid-structure interaction in a rod bundle

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NUCLEAR ENGINEERING AND DESIGN 2024年 422卷

作者： Vidal, Guilherme Ricciardi, Guillaume Lo Pinto, Emmanuel Faucher, Vincent Lamorte, Nicolas Pacull, Julien Cadarache CEA DES IRESNENucl Technol Dept F-13108 St Paul Lez Duranc France Framatome France 2 Rue Prof Jean Bernard F-69007 Lyon France

Pressurized water reactors (PWRs) are employed worldwide and continue to expand in capacity. They require thorough investigation, particularly concerning their safety and operational efficiency. To ensure these factors, comprehensive research into their various components and an understanding of the diverse phenomena they experience within a PWR are imperative. These phenomena can be of mechanical, thermal, hydraulic, or neutronic nature. Among these components, fuel assemblies (FAs) hold a main role in PWRs. The intricate interplay of these physical factors results in the modification of FAs geometry, specifically permanent elongation and lateral deformations referred to as irradiation creep. The earliest reported occurrence of these deformations dates back to 1994 in Ringhals reactors, where various FAs exhibited distinct deformations (Andersson et al., 2005). Given that these phenomena occur over a time span of months to years in metallic materials, conducting investigations within the confines of a typical laboratory observation period becomes impractical. Consequently, this project proposes an alternative experimental methodology to overcome this challenge, thus gaining a deeper understanding of the fluency phenomenology in FAs behavior. This methodology consists on the design of a reduced-scale test section, capable of replicating the fluid-structure interaction (FSI) responsible for creep, the creation of spacer grids through 3D printing technology, and selection of the appropriate material for the fuel rods (FRs), with an emphasis on macroscopic coupling effects, rather than focusing into the micro-structural response of the material. To experimentally observe the deformation on the FAs, cameras were used to capture images through the time during the test, to catch the displacement of the FRs. The first results showed the mock-up was able to reproduce the FSI causing the creep on the FAs, it was possible to capture the displacement evolution along time, and

关键词： fluid-structure interaction PWR Creep Fuel assembly bow Thermal-hydraulics

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An unfitted mesh semi-implicit coupling scheme for fluid-structure interaction with immersed solids

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2021年第19期122卷 5384-5408页

作者： Fernandez, Miguel A. Gerosa, Fannie M. Inria F-75012 Paris France Sorbonne Univ Paris France CNRS Paris France

Unfitted mesh finite element approximations of immersed incompressible fluid-structure interaction problems which efficiently avoid strong coupling without compromising stability and accuracy are rare in the literature. Moreover, most of the existing approaches introduce additional unknowns or are limited by penalty terms which yield ill-conditioning issues. In this paper, we introduce a new unfitted mesh semi-implicit coupling scheme which avoids these issues. To this purpose, we provide a consistent generalization of the projection based semi-implicit coupling paradigm of (Int. J. Num. Meth. Engg., 69(4):794-821, 2007) to the unfitted mesh Nitsche-extended-FEM framework.

关键词： fluid-structure interaction Nitsche-XFEM projection method semi-implicit coupling scheme unfitted meshes

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An XFEM/DG Approach for fluid-structure interaction Problems with Contact

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APPLICATIONS OF MATHEMATICS 2021年第2期66卷 183-211页

作者： Formaggia, Luca Gatti, Federico Zonca, Stefano Politecn Milan Dipartimento Matemat Modellist & Calcolo Sci Piazza Leonardo da Vinci 32 I-20133 Milan Italy

In this work, we address the problem of fluid-structure interaction (FSI) with moving structures that may come into contact. We propose a penalization contact algorithm implemented in an unfitted numerical framework designed to treat large displacements. In the proposed method, the fluid mesh is fixed and the structure meshes are superimposed to it without any constraint on the conformity. Thanks to the Extended Finite Element Method (XFEM), we can treat discontinuities of the fluid solution on the mesh elements intersecting the structure. The coupling conditions at the fluid-structure interface are enforced via a discontinuous Galerkin mortaring technique, which is a penalization method that ensures the consistency of the scheme with the underlining problem. Concerning the contact problem, we consider a frictionless contact model in a master/slave approach. By considering the coupled FSI-contact problem, we perform some numerical tests to assess the sensitivity of the proposed method with respect to the discretization and contact parameters and we show some examples in the case of contact between a flexible body and a rigid wall and between two deformable structures.

关键词： fluid-structure interaction contact extended finite element method discontinuous Galerkin Nitsche’ s method

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