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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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Bandgap characteristics of rib-stiffened plates with fluid-structure interaction: A finite element approach

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MECHANICS OF MATERIALS 2025年 203卷

作者： Hu, L. B. Zhou, X. Zhang, R. Z. Xiao, Z. - Q. Cong, Y. Gu, S. T. Southwest Univ Coll Engn & Technol Chongqing 400715 Peoples R China Chongqing Univ Sch Civil Engn Chongqing 400044 Peoples R China Univ Evry Univ Paris Saclay LMEE F-91020 Evry France Shanghai Puhe Engn Design Co Ltd Shanghai 200333 Peoples R China

This work offers a comprehensive investigation into the vibration band gaps of periodically rib-stiffened plates, incorporating the effects of fluid-structure interaction (FSI). By coupling the Mindlin plate theory with Timoshenko beam theory, the proposed model enables flexible arrangements of ribs within the plate structure, enhancing its design versatility. The inertial effects of the surrounding fluid are rigorously accounted for through an augmented mass matrix, which includes Bloch periodic boundary conditions, providing a robust framework for capturing the FSI phenomena. Numerical validations confirm the accuracy of both the rib-stiffened plate model in the absence of fluid , the FSI-integrated model. A systematic exploration of vibration band gaps is conducted, emphasizing the influence of various rib configurations under fluid-structure interaction. Detailed parametric analysis of orthogonally rib-stiffened plates reveals that specific rib designs play a crucial role in tuning the band gaps, offering valuable insights for optimizing vibro-acoustic performance in engineering applications.

关键词： Rib-stiffened plates fluid-structure interaction Band gap Periodic structures Vibration control

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Spatiotemporal mode extraction for fluid-structure interaction using mode decomposition

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JOURNAL OF SOUND AND VIBRATION 2025年 597卷

作者： Takahashi, Yusuke Hokkaido Univ Kita 13 Nishi 8Kita Ku Sapporo Hokkaido 0608628 Japan Fac Engn Sapporo Japan

A fluid-structure interaction (FSI) analysis model was developed based on the partitioned coupling approach. The study analyzed the fluid and structure behavior in a well-established validation case known as the Turek-Hron FSI benchmark test. This test involves strong, unsteady interaction between fluid flow and an elastic flap behind a rigid cylinder. Comparison of the elastic flap displacement frequencies and amplitudes from the present FSI model with reference data showed good agreement, validating the model. Dynamic mode decomposition (DMD) was employed to extract fundamental structures from the complex spatiotemporal data obtained from the FSI analysis. In addition, a mode-sensing technique based on a greedy algorithm was developed, and significant modes were extracted with elastic flap displacement as a feature. The crucial modes for the elastic flap displacement were the second bending modes at specific frequencies. However, these results differed significantly from the natural frequencies of the second bending modes obtained via eigenmode analysis. This discrepancy can be attributed to the close coupling between the fluid and structure, which alters elastic deformation behavior. The study demonstrates the potential for straightforward extraction of essential fluid-structure coupling using FSI-DMD.

关键词： fluid-structure interaction Dynamic mode decomposition Mode-sensing approach Reconstruction

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A combined 4D flow MR imaging and fluid-structure interaction analysis of ascending thoracic aortic aneurysms

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BIOMECHANICS AND MODELING IN MECHANOBIOLOGY 2025年 1-16页

作者： Zhu, Yu Armour, Chloee Li, Binghuan Pirola, Selene Salmasi, Yousuf Athanasiou, Thanos O'Regan, Declan P. Xu, Xiao Yun Imperial Coll London Dept Chem Engn London England Imperial Coll London Natl Heart & Lung Inst London England Delft Univ Technol Dept BioMech Engn Delft Netherlands Imperial Coll London Dept Surg & Canc London England Imperial Coll London MRC London Inst Med Sci London England

This study aimed to characterize the altered hemodynamics and wall mechanics in ascending thoracic aortic aneurysms (ATAA) by employing fully coupled two-way fluid-structure interaction (FSI) analyses. Our FSI models incorporated hyperelastic wall mechanical properties, prestress, and patient-specific inlet velocity profiles (IVP) extracted from 4D flow magnetic resonance imaging (MRI). By performing FSI analyses on 7 patient-specific ATAA models and 6 healthy aortas, the primary objective of the study was to compare hemodynamic and biomechanical features in ATAA versus healthy controls. A secondary objective was to examine the need for 4D flow MRI-derived IVP in FSI simulations by comparing results with those using two commonly adopted idealized IVPs: Flat-IVP and Para-IVP for selected cases. Our results show that, compared to the healthy aortas, the ATAA models exhibited highly disturbed blood flow in the ascending aorta. Consequently, maximum turbulent kinetic energy (TKE) at peak systole (155.0 +/- 188.4 Pa) and maximum time-averaged wall shear stress (TAWSS) (8.6 +/- 6.5 Pa) were significantly higher in the ATAA cohort, compared to 0.6 +/- 0.5 Pa and 2.8 +/- 0.7 Pa in the healthy aortas. Peak wall stress was also nearly doubled in the ATAA group (414 +/- 108 kPa vs. 215 +/- 31 kPa). Additionally, comparisons of simulation results across models with different IVPs underscore the importance of prescribing 3D-IVP at the inlet, especially for ATAA cases. Using idealized IVPs in two selected ATAA models (P1 and P7) substantially reduced the maximum TKE from 571 Pa to 0.01 Pa (Flat-IVP) and 0.02 Pa (Para-IVP) in P1 and from 73 Pa to 0.01 Pa (Flat-IVP) and 0.08 Pa (Para-IVP) in P7, while the maximum TAWSS in the ascending aorta decreased from 9.6 Pa to 0.7 Pa (Flat-IVP) and 0.9 Pa (Para-IVP) in P1, and from 3.6 Pa to 1.2 Pa and 0.9 Pa, respectively, in P7. Moreover, idealized IVPs also caused the peak wall stress to reduce by up to 11.5% in P1 with severe aortic valve

关键词： fluid-structure interaction Ascending thoracic aortic aneurysm Four-dimensional flow magnetic resonance imaging Inlet velocity profiles

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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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Hemodynamics in arterial bypass graft anastomoses with varying cuff sizes and proximal flow paths: a fluid-structure interaction study

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COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING 2025年第7期28卷 1066-1085页

作者： Bletsos, Georgios Rung, Thomas Radtke, Lars Hamburg Univ Technol Inst Fluid Dynam & Ship Theory M 8 Hamburg Germany Hamburg Univ Technol Inst Ship Struct Design & Anal M 10 Hamburg Germany

This article investigates the effect of the cuff size of arterial bypass grafts and the flow conditions on the hemodynamics in the anastomosis (connection) to the artery, using numerical simulations. We consider a fluid-structure interaction problem which is solved based on a partitioned scheme. Additionally, we employ computational fluid dynamics to investigate the effect of a rigid wall assumption. The work focuses on clinically relevant hemodynamic quantities associated with the development of intimal hyperplasia. We also include a model for the prediction of hemolysis into the simulation. The results show that even minor changes of the cuff size can result into significant differences in the corresponding quantities of interest. The importance of the inflow path is shown to be lower than that of the cuff size. The usually employed rigid wall assumption is found to be adequate to address wall shear stress oscillations but falls short on predicting maximum and minimum wall shear stress-related quantities of interest.

关键词： Hemodynamics fluid-structure interaction bypass-graft hemolysis oscillatory shear index

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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 STOCHASTIC fluid-structure interaction PROBLEM WITH THE NAVIER-SLIP BOUNDARY CONDITION

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SIAM JOURNAL ON MATHEMATICAL ANALYSIS 2024年第6期56卷 7508-7544页

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

We prove the existence of martingale solutions to a stochastic fluid-structure interaction problem involving a viscous, incompressible fluid flow, modeled by the 2D Navier--Stokes equations, through a deformable elastic tube modeled by the 1D shell/membrane equations. The fluid and the structure are nonlinearly coupled via the kinematic and dynamic coupling conditions at the fluid-structure interface. This article considers the case where the structure can have unrestricted displacement and explores the Navier-slip boundary condition imposed at the fluid-structure interface, displacement of which is not known a priori and is a part of the solution itself. The proof takes a time-discretization approach based on a Lie splitting scheme. The geometric nonlinearity stemming from the nonlinear coupling, the possibility of random fluid domain degeneracy, the potential jumps in the tangential components of the fluid and structure velocities at the moving interface, and the low regularity of the structure velocity require the development of new techniques that lead to the local-in-time existence of analytically weak martingale solutions.

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

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