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Modeling Fibrous Tissue in Vascular fluid-structure interaction: A Morphology-Based Pipeline and Biomechanical Significance

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2025年第1期41卷 e3892页

作者： Sun, Yujie Huang, Jiayi Lu, Qingshuang Yue, Xinhai Huang, Xuanming He, Wei Shi, Yun Liu, Ju Southern Univ Sci & Technol Dept Mech & Aerosp Engn Shenzhen Guangdong Peoples R China Fudan Univ Zhongshan Hosp Inst Vasc Surg Dept Vasc Surg Shanghai Peoples R China

Modeling fibrous tissue for vascular fluid-structure interaction analysis poses significant challenges due to the lack of effective tools for preparing simulation data from medical images. This limitation hinders the physiologically realistic modeling of vasculature and its use in clinical settings. Leveraging an established lumen modeling strategy, we propose a comprehensive pipeline for generating thick-walled artery models. A specialized mesh generation procedure is developed to ensure mesh continuity across the lumen and wall interface. Exploiting the centerline information, a series of procedures are introduced for generating local basis vectors within the arterial wall. The procedures are tailored to handle thick-walled tissues where basis vectors may exhibit transmural variations. Additionally, we propose methods for accurately identifying the centerline in multi-branched vessels and bifurcating regions. These modeling approaches are algorithmically implementable, rendering them readily integrable into mainstream cardiovascular modeling software. The developed fiber generation method is evaluated against the strategy using linear elastostatics analysis, demonstrating that the proposed approach yields satisfactory fiber definitions in the considered benchmark. Finally, we examine the impact of anisotropic arterial wall models on the vascular fluid-structure interaction analysis through numerical examples, employing the neo-Hookean model for comparative purposes. The first case involves an idealized curved geometry, while the second studies an image-based abdominal aorta model. Our numerical results reveal that the deformation and stress distribution are critically related to the constitutive model of the wall, whereas hemodynamic factors are less sensitive to the wall model. This work paves the way for more accurate image-based vascular modeling and enhances the prediction of arterial behavior under physiologically realistic conditions.

关键词： anisotropic material model fluid-structure interaction image-based modeling patient-specific simulation vascular biomechanics

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A coupled immersed boundary method and isogeometric shell analysis for fluid-structure interaction of flexible and lightweight shells in high-Reynolds number flows

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COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING 2025年 439卷

作者： Yan, Keye Wu, Yue Zhu, Qiming Khoo, Cheong Harbin Inst Technol Minist Educ Key Lab Struct Dynam Behav & Control Harbin 150090 Peoples R China Harbin Inst Technol Minist Ind & Informat Technol Key Lab Smart Prevent & Mitigat Civil Engn Disaste Harbin 150090 Peoples R China Harbin Inst Technol Sch Civil Engn Harbin 150090 Peoples R China Natl Univ Singapore Dept Mech Engn Singapore 117575 Singapore

This study presents an efficient numerical framework for simulating fluid-structure interactions (FSIs) involving flexible, lightweight shells subjected to high-Reynolds-number flows. By combining the immersed boundary method (IBM) and isogeometric analysis (IGA), the framework incorporates three major innovations: (1) a wall-modeling, direct-forcing, diffused-interface IBM tailored for FSI simulations with high-Reynolds-number turbulent flows, employing non- equilibrium explicit wall functions;(2) integration of the interface quasi-Newton inverse least-squares (IQN-ILS) method into the IBM/IGA framework to enhance the accuracy and efficiency of iterative Gauss-Seidel coupling in strongly coupled FSI scenarios;and (3) high-order solvers for both fluid and structural domains, featuring a sixth-order compact finite difference method (FDM) for fluid dynamics and isogeometric shell formulations for structural analysis. The framework is validated through four numerical test cases, including simulations of a hinged flag, an inverted flag, a membrane airfoil, and an air-supported membrane structure. The results demonstrate good agreement with reference data, showing the framework's efficiency, accuracy, and applicability for solving large-scale shell-related FSI problems across diverse engineering and scientific domains.

关键词： fluid-structure interaction Immersed boundary method High-Reynolds number flows Isogeometric analysis Wall modeling

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A coupled δ⁺-SPH-NOSB-PD method: Towards fluid-structure interaction problems involving violent free-surface flows and isotropic structural linear elastic deformations and failures

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APPLIED MATHEMATICAL MODELLING 2025年 145卷

作者： Liang, Guang-Qi Sun, Peng-Nan Lyu, Hong-Guan Zhang, Gui-Yong Sun Yat sen Univ Sch Ocean Engn & Technol Zhuhai 519082 Peoples R China Dalian Univ Technol Sch Naval Architecture Engn Dalian 116024 Peoples R China

In this paper, a robust integrated particle model is developed by coupling smoothed particle hydrodynamics (SPH) and peridynamics (PD) to deal with the fluid-structure interaction (FSI) problems involving violent free-surface flows and isotropic structural linear elastic deformations and failures. The partitioned approach is conducted in between a stable and accurate delta(+)-SPH fluid model and a non-ordinary state-based PD (NOSB-PD) structure model based on the idea of non-local interactions. The SPH fluid model is strengthened with a set of previously advanced numerical techniques, hence, the developed coupled scheme is referred to as an enhancement of the traditional SPH-PD. Crack initiation and propagation in structural responses under fluid dynamics are considered, which is relatively rare in previous FSI simulations. The information between the boundaries is transferred via the acceleration-based way and pressure integration method, which helps to ensure numerical stability and accuracy. In addition, a modified sequential staggered (MSS) algorithm is adopted to improve the efficiency when the time step of the structure significantly differs from that of the fluid. Firstly, the performance of the PD-based structure model is verified by three benchmarks, namely a free oscillating cantilever plate, stress distribution inside an isotropic plate with a circular opening and the Kalthoff-Winkler impact test. Then, several challenging FSI problems are simulated to validate the accuracy and robustness of the present FSI solver in predicting the fluid fields and the elastic response and fracture of the structure. The results achieved are in good agreement with the references, verifying the scheme's feasibility in this work.

关键词： delta(+)-SPH NOSB-PD fluid-structure interaction Violent free-surface flow Structural deformation and failure

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Machine-learning enhanced predictors for accelerated convergence of partitioned fluid-structure interaction simulations

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COMPUTER PHYSICS COMMUNICATIONS 2025年 310卷

作者： Tiba, Azzeddine Dairay, Thibault De Vuyst, Florian Mortazavi, Iraj Ramirez, Juan Pedro Berro CNAM M2N 2 Rue Conte F-75003 Paris France Manufacture Francaise Pneumat Michelin Pl Carmes Dechaux F-63000 Clermont Ferrand France Univ Paris Saclay Ctr Borelli CNRS ENS Paris Saclay 4 Ave Sci F-91190 Gif Sur Yvette France Univ Technol Compiegne Lab Biomech & Bioengn CNRS Rue docteur Schweitzer F-60203 Compiegne France ALTAIR ENGN France 5 Rue Renaissance F-92160 Antony France

Stable partitioned techniques for simulating unsteady fluid-structure interaction (FSI) are known to be computationally expensive when high added-mass is involved. Multiple coupling strategies have been developed to accelerate these simulations, but often use predictors in the form of simple finite-difference extrapolations. In this work, we propose a non-intrusive data-driven predictor that couples reduced-order models of both the solid and fluid subproblems, providing an initial guess for the nonlinear problem of the next time step calculation. Each reduced order model is composed of a nonlinear encoder-regressor-decoder architecture and is equipped with an adaptive update strategy that adds robustness for extrapolation. In doing so, the proposed methodology leverages physics-based insights from high-fidelity solvers, thus establishing a physics-aware machine learning predictor. Using three strongly coupled FSI examples, this study demonstrates the improved convergence obtained with the new predictor and the overall computational speedup realized compared to classical approaches.

关键词： Physically relevant reduced order model fluid-structure interaction Partitioned approach ROM-FOM coupling Data-driven model Fixed-point acceleration

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Predictive dynamic wetting, fluid-structure interaction simulations for braze run-out

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COMPUTERS & fluidS 2025年 290卷

作者： Horner, Jeffrey S. Kemmenoe, David J. Bourdon, Gustav J. Roberts, Scott A. Arata, Edward R. Ray, Jaideep Grillet, Anne M. Sandia Natl Labs Albuquerque NM 87185 USA Sandia Natl Labs Livermore CA 94550 USA

Brazing and soldering are metallurgical joining techniques that use a wetting molten metal to create a joint between two faying surfaces. The quality of the brazing process depends strongly on the wetting properties of the molten filler metal, namely the surface tension and contact angle, and the resulting joint can be susceptible to various defects, such as run-out and underfill, if the material properties or joining conditions are not suitable. In this work, we implement a finite element simulation to predict the formation of such defects in braze processes. This model incorporates both fluid-structure interaction through an arbitrary Eulerian-Lagrangian technique and free surface wetting through conformal decomposition finite element modeling. Upon validating our numerical simulations against experimental run-out studies on a silver-Kovar system, we then use the model to predict run-out and underfill in systems with variable surface tension, contact angles, and applied pressure. Finally, we consider variable joint/surface geometries and show how different geometrical configurations can help to mitigate run-out. This work aims to understand how brazing defects arise and validate a coupled wetting and fluid-structure interaction simulation that can be used for other industrial problems.

关键词： Finite element modeling fluid-structure interaction Moving interface Arbitrary Lagrangian-Eulerian Wetting Brazing

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A fully-integrated lattice Boltzmann method for fluid-structure interaction

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JOURNAL OF COMPUTATIONAL PHYSICS 2025年 526卷

作者： Sun, Yue Rycroft, Chris H. Univ Wisconsin Madison Dept Math Madison WI 53706 USA Harvard Univ John A Paulson Sch Engn & Appl Sci Cambridge MA 02138 USA Lawrence Berkeley Lab Computat Res Div Berkeley CA 94720 USA

We present a fully-integrated lattice Boltzmann (LB) method for fluid-structure interaction (FSI) simulations that efficiently models deformable solids in complex suspensions and active systems. Our Eulerian method (LBRMT) couples finite-strain solids to the LB fluid on the same fixed computational grid with the reference map technique (RMT). An integral part of the LBRMT is a new LB boundary condition for moving deformable interfaces across different densities. With this fully Eulerian solid-fluid coupling, the LBRMT is well-suited for parallelization and simulating multi-body contact without remeshing or extra meshes. We validate its accuracy via a benchmark of a deformable solid in a lid-driven cavity, then showcase its versatility through examples of soft solids rotating and settling. The LBRMT achieves a spatial convergence rate between first-order and second-order for FSI simulations and is designed for low to intermediate Reynolds number flows with finite inertia at small Mach numbers. With simulations of complex suspensions mixing, we highlight the potential of the LBRMT for studying collective behavior in soft matter and biofluid dynamics.

关键词： fluid-structure interaction Lattice Boltzmann method Complex suspensions Collective motion

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Improved unsteady fluid-structure interaction analysis using the dynamic mode decomposition on a composite marine propeller

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OCEAN ENGINEERING 2025年 319卷

作者： Kim, Sunghoon Shin, Sangjoon Seoul Natl Univ Dept Aerosp Engn Seoul 08826 South Korea HD Hyundai Heavy Ind Ship Performance Res Dept Ulsan 44032 South Korea Seoul Natl Univ Inst Adv Aerosp Technol Seoul 08226 South Korea

Unlike conventional metallic propellers, a composite blade's structural deformation must be considered. Composite marine propellers typically require additional computational time for unsteady analysis to accommodate the structural deflection. This study proposes a fast fluid-structure interaction (FSI) analysis method that considers the blade deformation of composite marine propellers. The unsteady boundary element method was modified for fluid analysis to include the effects of blade deformation. The structural response was predicted by considering the added mass and time-dependent hydrodynamic damping effects. Because an FSI analysis typically requires numerous iterative computations, a structural analysis was conducted using the mode superposition methodology, with hydrodynamic loads converted into the frequency domain via dynamic mode decomposition. Additionally, a quasi-Newton-based algorithm was employed in the iterative FSI analysis to improve the convergence. We performed FSI analyses on two composite propellers and validated the results by comparing them with existing numerical results. Our results show good agreement with existing numerical results, while significantly reducing the computational time.

关键词： Composite marine propeller Dynamic mode decomposition fluid-structure interaction Boundary element method

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Comparison and identification of human coronary plaques with/without erosion using patient-specific optical coherence tomography-based fluid-structure interaction models: a pilot study

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2025年第1期24卷 213-231页

作者： Zhu, Yanwen Zhao, Chen Wu, Zheyang Maehara, Akiko Tang, Dalin Wang, Liang Gao, Zhanqun Xu, Yishuo Lv, Rui Huang, Mengde Zhang, Xiaoguo Zhu, Jian Jia, Haibo Yu, Bo Chen, Minglong Mintz, Gary S. Southeast Univ Sch Biol Sci & Med Engn Nanjing 210096 Peoples R China Harbin Med Univ Affiliated Hosp 2 Dept Cardiol Natl Key Lab Frigid Zone Cardiovasc Dis Harbin 150086 Peoples R China Chinese Minist Educ Key Lab Myocardial Ischemia Harbin 150086 Peoples R China Worcester Polytech Inst Math Sci Dept Worcester MA 01609 USA Columbia Univ Cardiovasc Res Fdn New York NY 10022 USA Shandong Second Prov Gen Hosp Dept Cardiac Surg Jinan 250022 Peoples R China Southeast Univ Zhongda Hosp Dept Cardiol Nanjing 210009 Peoples R China Nanjing Med Univ Affiliated Hosp 1 Nanjing 210029 Peoples R China

Plaque erosion (PE) with secondary thrombosis is one of the key mechanisms of acute coronary syndrome (ACS) which often leads to drastic cardiovascular events. Identification and prediction of PE are of fundamental significance for disease diagnosis, prevention and treatment. In vivo optical coherence tomography (OCT) data of eight eroded plaques and eight non-eroded plaques were acquired to construct three-dimensional fluid-structure interaction models and obtain plaque biomechanical conditions for investigation. Plaque stenosis severity, plaque burden, plaque wall stress (PWS) and strain (PWSn), flow shear stress (FSS), and Delta FSS (FSS variation in time) were extracted for comparison and prediction. A logistic regression model was used to predict plaque erosion. Our results indicated that the combination of mean PWS and mean Delta FSS gave best prediction (AUC = 0.866, 90% confidence interval (0.717, 1.0)). The best single predictor was max Delta FSS (AUC = 0.819, 90% confidence interval (0.624, 1.0)). The average of maximum FSS values from eroded plaques was 76% higher than that from the non-eroded plaques (127.96 vs. 72.69 dyn/cm2) while the average of mean FSS from erosion sites of the eight eroded plaques was 48.6% higher than that from sites without erosion (71.52 vs. 48.11 dyn/cm2). The average of mean PWS from plaques with erosion was 22.83% lower than that for plaques without erosion (83.2 kPa vs. 107.8 kPa). This pilot study suggested that combining plaque stress, strain and flow shear stress could help better identify patients with potential plaque erosion, enabling possible early intervention therapy. Further studies are needed to validate our findings.

关键词： Plaque erosion fluid-structure interaction Vulnerable plaque Optical coherence tomography Erosion identification

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A hybrid strategy for numerical simulations of fluid-structure interaction problems in ocean engineering

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APPLIED OCEAN RESEARCH 2025年 155卷

作者： Liao, Xin Koh, Chan Ghee Chow, Yean Khow Natl Univ Singapore Dept Civil & Environm Engn Singapore 117576 Singapore

A hybrid strategy combining the advantages of the meshless Consistent Particle Method (CPM) and the meshbased Finite Element Method (FEM) is proposed in this paper to solve fluid-structure interaction problems. Water is modelled by CPM, whereas deformable structure is solved by FEM. Unlike some traditional particle methods that require a kernel function in computing spatial derivatives, CPM utilizes Taylor series expansion and avoids the use of artificial values of physical parameters (such as artificial viscosity and sound speed). The interaction between water and structure is achieved by a partitioned approach for its flexibility and ease of implementation. To ensure compatibility between CPM and FEM solutions at the fluid-structure interface, an iteration scheme of enforcing pressure Poisson equation (PPE) is proposed. The accuracy and stability of the proposed hybrid strategy are validated through three benchmark examples: water column on an elastic plate, sloshing of sunflower oil interacting with an elastic baffle, and a dam break with an elastic gate. Comparisons between CPM-FEM results with published experimental and numerical results demonstrate the effectiveness and advantages of the proposed hybrid strategy.

关键词： fluid-structure interaction Consistent particle method Finite element method Taylor series expansion Pressure Poisson equation Elastic structure

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Gevrey Regularity for A fluid-structure interaction Model

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JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS 2025年第1期205卷 1-17页

作者： Avalos, George Mcknight, Dylan Mcknight, Sara Univ Nebraska Lincoln Lincoln NE 68588 USA Colorado Mesa Univ Grand Junction CO 81501 USA

A result of Gevrey regularity is ascertained for a semigroup which models a fluid-structure interaction problem. In this model, the fluid evolves in a piecewise smooth or convex geometry O\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\mathcal {O}$$\end{document}. On a portion of the boundary, a fourth order plate equation is coupled with the fluid through pressure and matching velocities. The key to obtaining the conclusion of Gevrey regularity is an appropriate estimation of the resolvent of the associated C0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$C_0$$\end{document}-semigroup operator. Moreover, a numerical scheme and example is provided which empirically demonstrates smoothing of the fluid-structure semigroup.

关键词： fluid-structure interaction Stokes equations Kirchoff plate Gevrey class semigroups

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