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The fluid-structure interaction seismic analysis of the BWR nuclear power plant spent fuel pool

NUCLEAR ENGINEERING AND TECHNOLOGY 2025年第6期57卷

作者： Shen, Yu-Yu Natl Atom Res Inst Taoyuan Taiwan

In the nuclear power plant, the spent fuel pool (SFP) is an important nuclear security structure, it uses as temporary storage for spent fuel assemblies and removes the decaying heat with pool water from spent fuel assemblies. The issue of seismic safety concerning nuclear facilities has always been a primary concern for the country located in an earthquake-prone zone. When an earthquake strikes the spent fuel pool, it could lead water to sloshing behavior. It may produce additional forces on the pool and cause water overflow. It is therefore critical to investigate the sloshing phenomenon in a seismic assessment of the SFP. The objective of the paper is concerned with the problem of modeling the fluid-structure interaction (FSI) analysis with a SFP under Beyond-Design-Basis Earthquake (BDBE). The study focuses on the sloshing phenomena with the finite element analysis (FEA) code LS-DYNA. To be concerned about the structural integrity of the spent fuel pool, this paper also applied ACI-349 and ASME code to evaluate the seismic performance of the structure and the safety margin. The results show that the Taiwan BWR Mark-I Nuclear Power Plant spent fuel pool can maintain its structural integrity under the beyond-design basis earthquakes.

关键词： Spent fuel pool Structural integrity fluid-structure interaction

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Application of computational fluid dynamics and physics informed neural networks in predicting rupture risk of thoracoabdominal aneurysms with fluid-structure interaction analysis

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CHINESE JOURNAL OF PHYSICS 2025年 95卷 433-454页

作者： Rehman, M. Abaid Ur Ekici, Ozgur Farooq, M. Asif Talha, Rashid M. Amir, Sadaf Natl Univ Sci & Technol NUST Sch Nat Sci SNS Dept Math Sect H-12 Islamabad 44000 Pakistan Hacettepe Univ Dept Mech Engn TR-06800 Ankara Turkiye

laminar and turbulent flow conditions are explored to reflect the diastolic and systolic phases, respectively.

关键词： Thoracoabdominal aneurysms Physics informed neural networks fluid-structure interaction Asymmetry Thrombus Rupture risk CFD Turbulent flow

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Numerical Investigations of a Two-Way Coupled fluid-structure interaction Approach for Fast Transients in fluid-Filled Flexible Piping Systems

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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2025年第5期50卷 3073-3098页

作者： Daude, Frederic Galon, Pascal Shams, Afaque EDF Lab Paris Saclay ERMES Palaiseau France CEA Saclay DEN SEMT Gif Sur Yvette France IMSIA UMR EDF CNRS CEA ENSTA F-9219 Palaiseau France KFUPM Dept Mech Engn Dhahran Saudi Arabia KFUPM Interdisciplinary Res Ctr Renewable Energy & Powe Dhahran Saudi Arabia

fluid-structure interaction in fluid-filled flexible pipelines is modeled herewith a time explicit nonlinear 1-D coupled approach. The internal steam-water fluid is modeled using a homogeneous equilibrium model where kinematic, mechanical, thermal, and thermodynamic equilibrium between liquid and steam water is assumed. As a consequence, the nonlinear convective effects are taken into account as well as the temperature variations in the fluid model. The mechanical behavior of the pipelines is obtained following the Euler-Bernoulli beam theory. This leads to structural equations taking into account axial, flexural, lateral, and torsional pipe motion. In addition, plasticity is also considered in the structural behavior. Thus, the overall model corresponds to the nonlinear extension of the so-called seven degree-of-freedom fluid-structure interaction model. Furthermore, radial expansion of the pipe cross section due to the internal fluid pressure loading is also taken into account, while the pipe radial motion is neglected. Both junction and friction coupling mechanisms are considered in the present model, whereas the Poisson coupling is ignored in this study. An explicit finite-volume method is used for approximating the fluid equations and is coupled with an explicit finite-element approach used for the structural beam equations. This leads to an explicit two-way coupling approach for fluid-structure interactions which is assessed on a selection of several experiments involving non-isothermal steam-water behavior or significant FSI effects during fast-transient events. Comparisons are given with the experimental data on all considered experiments, which clearly demonstrates the ability of the present approach to be efficient and representative.

关键词： fluid transients Elastic-plastic fluid-filled pipes fluid-structure interaction Homogeneous equilibrium model Euler-Bernoulli beam element

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A 2D stochastic nonlinearly coupled fluid-structure interaction problem in compliant arteries with unrestricted structural displacement

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JOURNAL OF DIFFERENTIAL EQUATIONS 2025年 431卷

作者： Tawri, Krutika Univ Calif Berkeley Dept Math Berkeley CA 94720 USA

In this paper, we study a nonlinear fluid-structure interaction (FSI) problem driven by a multiplicative, white-in-time noise. The problem consists of the Navier-Stokes equations describing the flow of an incompressible, viscous fluid in a 2D cylinder interacting with an elastic wall whose elastodynamics is described by membrane/shell equations. The stochastic force is applied both to the fluid equations as a volumetric body force, and to the structure as an external forcing to the deformable fluid boundary. The fluid and the structure are nonlinearly coupled via the kinematic and dynamic conditions assumed at the moving interface, which is a random variable not known a priori. Majority of the existing FSI literature builds on the assumption that the structure can only be deformed radially, neglecting its longitudinal displacement. In this article, we consider the case where the structure is allowed to have vectorial (unrestricted) deformations. (c) 2025 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://***/licenses/by/4.0/).

关键词： Stochastic moving boundary problems fluid-structure interaction Martingale solutions

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Existence of martingale solutions to a nonlinearly coupled stochastic fluid-structure interaction problem

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COMMUNICATIONS IN PARTIAL DIFFERENTIAL EQUATIONS 2025年第3期50卷 353-406页

作者： Tawri, Krutika Canic, Suncica Univ Calif Berkeley Dept Math Berkeley CA 94720 USA

We study a nonlinear stochastic fluid-structure interaction problem with a multiplicative, white-in-time noise. The problem consists of the Navier-Stokes equations describing the flow of an incompressible, viscous fluid in a 2D cylinder interacting with an elastic lateral wall whose elastodynamics is described by a membrane equation. The flow is driven by the inlet and outlet data and by the stochastic forcing. The noise is applied both to the fluid equations as a volumetric body force, and to the structure as an external forcing to the deformable fluid boundary. The fluid and the structure are nonlinearly coupled via the kinematic and dynamic conditions assumed at the moving interface, which is a random variable not known a priori. The geometric nonlinearity due to the nonlinear coupling requires the development of new techniques to capture martingale solutions for this class of stochastic FSI problems. Our analysis reveals a first-of-its-kind temporal regularity result for the solutions. This is the first result in the field of SPDEs that addresses the existence of solutions on moving domains involving incompressible fluids, where the displacement of the boundary and the fluid domain are random variables that are not known a priori and are parts of the solution itself.

关键词： fluid-structure interaction martingale solutions stochastic moving boundary problems

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Vanishing centre-of-mass limit of the 2D-1D corotational Oldroyd-B polymeric fluid-structure interaction problem

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NONLINEARITY 2025年第3期38卷 035027-035027页

作者： Mensah, Prince Romeo Tech Univ Clausthal Inst Math Erzstr 1 D-38678 Clausthal Zellerfeld Germany

We consider the Oldroyd-B model for a two-dimensional dilute corotational polymer fluid with centre-of-mass diffusion that is interacting with a one-dimensional viscoelastic shell. We show that any family of strong solutions of the system described above that is parametrized by the centre-of-mass diffusion coefficient converges, as the coefficient goes to zero, to a weak solution of a corotational polymer fluid-structure interaction system without centre-of-mass diffusion but with essentially bounded polymer number density and extra stress tensor. As a consequence, we also obtain a weak-strong uniqueness result that says that the weak solution of the latter is unique in the class of the strong solution of the former as the centre-of-mass diffusion vanishes.

关键词： incompressible Navier-Stokes-Fokker-Planck system Oldroyd-B fluid-structure interaction polymeric fluid corotational fluid

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Computational Methods and Representative Cases for fluid-structure interaction in Nuclear Reactor Vessel and Internals

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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2025年第5期50卷 3591-3615页

作者： Veber, Pascal Tornberg, Fredrik Shams, Afaque Siddiqui, Osman K. Ringhals AB Varobacka Sweden Onsala Engn AB Kungsbacka Sweden King Fahd Univ Petr & Minerals KFUPM Dept Mech Engn Dhahran Saudi Arabia KFUPM Interdisciplinary Res Ctr Ind Nucl Energy IRC INE Dhahran Saudi Arabia

Flow-induced vibration (FIV) in nuclear reactor vessels has been extensively studied during the mechanical design of reactor vessels. Many power plants have increased the interest in coupled modern fluid and solid mechanics codes to facilitate the understanding of the phenomena causing damage to components termed fluid-structure interaction (FSI). A better understanding of these structure interactions is critical for enhancing safety, minimizing radiation risks, improving public health and safety, and fostering innovation in the nuclear industry. Furthermore, it supports nuclear energy as a clean alternative to fossil fuels, contributing to the reduction of global carbon emissions and advancing responsible production and consumption. Pressure wave propagation, acoustic resonance, flow-induced turbulence, and fluid-elastic instability are the four types of FSI-coupled systems that are investigated in this work. Different computational methods are presented to simulate FSI problems and should be selected depending on the physical complexity of the problems. One-way FSI where Computational fluid Dynamics (CFD) or thermal-hydraulics results are applied on a structural model is common, while FSI calculations with iterative fluid-structure simulations will be more and more available with the increase in computer capacity and the development of a more cost-effective turbulence model. Most modeling results have resulted in errors in the range of +/- 10% with the experimental data;however, in some cases, the choice of a different boundary condition has been shown to result in up to 30% errors.

关键词： Flow-induced vibration fluid-structure interaction Reactor vessel CFD Thermal-hydraulics

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Nonlinear flow control mechanism of two flexible flaps with fluid-structure interaction

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Acta Mechanica Sinica 2025年第2期41卷 116-131页

作者： Jiakun Han Chao Dong Jian Zhang Gang Chen College of Science Xi’an University of Science and TechnologyXi’an 710054China Beijing Institute of Space Long March Vehicle Beijing 100076China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle TechnologyBeijing 100076China State Key Laboratory of Strength and Vibration for Mechanic Structures Shaanxi Key Laboratory of Service Environment and Control for Flight VehiclesSchool of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China

The flow control at low Reynolds numbers is one of the most promising technologies in the field of aerodynamics,and it is also an important source of the innovation for novel *** this study,a new way of nonlinear flow control by interaction between two flexible flaps is proposed,and their flow control mechanism is studied employing the self-constructed immersed boundary-lattice Boltzmann-finite element method(IB-LB-FEM).The effects of the difference in material properties and flap length between the two flexible flaps on the nonlinear flow control of the airfoil are *** is suggested that the relationship between the deformation of the two flexible flaps and the evolution of the vortex under the fluid-structure interaction(FSI).It is shown that the upstream flexible flap plays a key role in the flow control of the two flexible *** FSI effect of the upstream flexible flap will change the unsteady flow behind it and affect the deformation of the downstream flexible *** flexible flaps with different material properties and different lengths will change their own FSI characteristics by the induced vortex,effectively suppressing the flow separation on the airfoil’s upper *** interaction of two flexible flaps plays an extremely important role in improving the autonomy and adjustability of flow *** numerical results will provide a theoretical basis and technical guidance for the development and application of a new flap passive control technology.

关键词： Nonlinear flow control Flexible flap fluid-structure interaction Flow separation IB-LB-FEM

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Pressure coefficient distributions on Hyperbolic Paraboloid membranes by Numerical fluid-structure interaction

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LATIN AMERICAN JOURNAL OF SOLIDS AND structureS 2025年第4期22卷

作者： Maldonado-Rios, Ricardo Gamboa-Marrufo, Mauricio Cismasiu, Corneliu Moreno-Herrera, Joel Alberto Autonomous Univ Yucatan Engn Fac Struct Engn Grp Ave Ind Contaminantes S-N Merida 97000 Yucatan Mexico NOVA Sch Sci & Technol CERIS NOVA P-2829516 Caparica Portugal NOVA Sch Sci & Technol Dept Civil Engn P-2829516 Caparica Portugal

Most studies, standards, and codes on wind pressure distributions commonly disregard the influence of the flexibility of structures. Nevertheless, in the case of tensile-membrane structures, their flexibility cannot be ignored, so this study presents the results of numerical simulations evaluating wind pressure coefficient distributions on tensile-membrane structures, accounting for fluid-structure interaction (FSI) choosing the most common geometry: the hyperbolic paraboloid. Various curvature configurations, wind incidence directions, and structural models (both open and enclosed) were analyzed. The FSI solution involves a twoway partitioned simulation between Computational fluid Dynamics, Computational Structural Dynamics and through a coupling system that culminates in the derivation of final pressure coefficient distributions. Results indicate that pressure coefficients obtained for rigid models underestimate those obtained by the FSI methodology, which accounts for deformations altering the interaction between the fluid and membrane.

关键词： Hyperbolic paraboloid fluid-structure interaction computational fluid dynamics pressure coefficients wind analysis tensile membrane structures tensile membrane structures

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Unraveling aortic hemodynamics using fluid structure interaction: biomechanical insights into bicuspid aortic valve dynamics with multiple aortic lesions

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2025年第1期24卷 17-27页

作者： Govindarajan, Vijay Wanna, Charles Johnson, Nils P. Kolanjiyil, Arun V. Kim, Hyunggun Kitkungvan, Danai Mcpherson, David M. Grande-Allen, Jane Chandran, Krishnan B. Estrera, Antony Ramzy, Danny Prakash, Siddharth Univ Texas Hlth Sci Ctr Houston McGovern Med Sch Dept Internal Med Div Cardiol 1881 East Rd Houston TX 77054 USA Boston Childrens Hosp Boston MA 02115 USA Harvard Med Sch Boston MA 02115 USA Virginia Commonwealth Univ Richmond VA USA Sungkyunkwan Univ Suwon Gyeonggi Do South Korea Rice Univ Houston TX USA Univ Iowa Iowa City IA USA

Aortic lesions, exemplified by bicuspid aortic valves (BAVs), can complicate congenital heart defects, particularly in Turner syndrome patients. The combination of BAV, dilated ascending aorta, and an elongated aortic arch presents complex hemodynamics, requiring detailed analysis for tailored treatment strategies. While current clinical decision-making relies on imaging modalities offering limited biomechanical insights, integrating high-performance computing and fluid-structure interaction algorithms with patient data enables comprehensive evaluation of diseased anatomy and planned intervention. In this study, a patient-specific workflow was utilized to biomechanically assess a Turner syndrome patient's BAV, dilated ascending aorta, and elongated arch. Results showed significant improvements in valve function (effective orifice area, EOA increased approximately twofold) and reduction in valve stress (similar to 1.8-fold) following virtual commissurotomy, leading to enhanced flow dynamics and decreased viscous dissipation (similar to twofold) particularly in the ascending aorta. However, increased viscous dissipation in the distal transverse aortic arch offset its local reduction in the AAo post-intervention, emphasizing the elongated arch's role in aortic hemodynamics. Our findings highlight the importance of comprehensive biomechanical evaluation and integrating patient-specific modeling with conventional imaging techniques for improved disease assessment, risk stratification, and treatment planning, ultimately enhancing patient outcomes.

关键词： Bicuspid aortic valve Dilated aorta Elongated arch fluid-structure interaction Aortic hemodynamics Valve deformation

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