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fluid-structure interaction analysis for abdominal aortic aneurysms: the role of multi-layered tissue architecture and intraluminal thrombus

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FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY 2025年 13卷 1519608页

作者： Yue, Xinhai Huang, Jiayi Liu, Ju Southern Univ Sci & Technol Dept Mech & Aerosp Engn Shenzhen Guangdong Peoples R China

Introduction Abdominal aortic aneurysm (AAA) is a life-threatening disease marked by localized dilatations of the infrarenal aortic wall. While clinical guidelines often use the aneurysm diameter as an indicator for surgical intervention, this metric alone may not reliably predict rupture risks, underscoring the need for detailed biomechanical analyses to improve risk *** We investigate the effects of the multi-layered tissue architecture and the intraluminal thrombus (ILT) on the wall stress distribution of AAA. Using fluid-structure interaction, we analyze the biomechanical responses of fusiform and saccular AAAs under three conditions: without ILT, with ILT but no tissue degradation, and with both ILT and tissue *** The findings show that the media is the primary load-bearing layer, and the multi-layered model yields a more accurate stress profile than the single-layered tissue model. The ILT substantially reduces overall stress levels in the covered tissue, although its impact on the location of peak stress varies across different scenarios. Media degradation increases the stress in the intima and adventitia, but the cushioning effect of ILT largely mitigates this *** The results underscore the importance of incorporating the multi-layered tissue architecture and ILT in patient-specific analyses of AAA. These factors may improve the predictive capabilities of biomechanical assessments for rupture risk.

关键词： fluid-structure interaction abdominal aortic aneurysm intraluminal thrombus multi-layered anisotropic tissue model patient-specific modeling

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fluid-structure interaction Analysis of Trapezoidal and Arc-Shaped Membranes Mimicking the Organ of Corti

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2025年第1期41卷 e3896页

作者： Doi, Kentaro Takeuchi, Sho Yamazaki, Hiroki Tsuji, Tetsuro Kawano, Satoyuki Osaka Univ Grad Sch Engn Sci Dept Mech Sci & Bioengn Osaka Japan

In a previous study [H. Shintaku et al., Sensors and Actuators A: Physical 158 (2010): 183-192], an artificially developed auditory sensor device showed a frequency selectivity in the range from 6.6 to 19.8 kHz in air and from 1.4 to 4.9 kHz in liquid. Furthermore, the sensor succeeded in obtaining auditory brain-stem responses in deafened guinea pigs [T. Inaoka et al., Proceedings of the National Academy of Sciences of the United States of America 108 (2011): 18390-18395]. Since then, several research groups have developed piezoelectric auditory devices that have the capability of acoustic/electric conversion. However, the piezoelectric devices are required to be optimally designed with respect to the frequency range in liquids. In the present study, focusing on the trapezoidal shape of the piezoelectric membrane, the vibration characteristics are numerically and experimentally investigated. In the numerical analysis, solving a three-dimensional fluid-structure interaction problem, resonant frequencies of the trapezoidal membrane are evaluated. Herein, Young's modulus of the membrane, which is made of polyvinylidene difluoride and is different from that of bulk, is properly determined to reproduce the experimental results measured in air. Using the modified elastic modulus for the membrane, the vibration modes and resonant frequencies in liquid are in good agreement with experimental results. It is also found that the resonant characteristics of the artificial basilar membrane for guinea pigs are quantitatively reproduced, considering the fluid-structure interaction. The present numerical method predicts experimental results and is available to improve the frequency selectivity of the piezoelectric membranes for artificial cochlear devices.

关键词： animal test artificial basilar membrane fluid-structure interaction PVDF resonant frequency Ringer's solution

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fluid-structure interaction approximation with embedded solid-shell finite elements using discontinuous shape functions

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APPLIED MATHEMATICAL MODELLING 2025年 143卷

作者： Aguirre, A. Zorrilla, R. Baiges, J. Codina, R. Univ Politecn Cataluna Jordi Girona 1-3Edifici C1 Barcelona 08034 Spain Univ Santiago Chile Estn Cent Ave Libertador Bernardo OHiggins 3363 Santiago Chile Int Ctr Numer Methods Engn CIMNE Barcelona Spain

This work introduces a numerical framework for addressing fluid-structure interaction problems involving thin structures subject to finite strain deformations. The proposed approach utilizes an embedded mesh method to establish a coupling interface between the fluid and structural domains. The novelty of the work is the incorporation of a recently developed locking-free stabilized formulation of solid-shell elements to handle the structural domain. The framework employs established techniques to handle pressure jumps in the fluid domain across the embedding interface and enforce boundary conditions, such as discontinuous shape functions for the pressure unknowns designed to segregate nodal contributions of the cut elements, and Nitsche's method for the weak imposition of transmission conditions in the fluid. The present approach is validated through a series of benchmark cases in both 2D and 3D environments, progressively increasing in complexity. The results demonstrate good agreement with existing literature, establishing the presented framework as a viable method for addressing fluid-structure interaction problems involving thin structures subject to large strains.

关键词： fluid-structure interaction Embedded mesh Cut-FEM Solid-shell Stabilization

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fluid-structure interaction simulations in patient-specific coronary arteries with aneurysms: Viscoelastic or shear-thinning property of blood

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COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2025年 265卷 108736-108736页

作者： Paz, C. Suarez, E. Gil, C. Pinto, S. I. S. Univ Vigo CINTECX Campus Univ Lagoas Marcosende Vigo 36310 Spain Galicia Heath Res Inst IIS Galicia Sur Biofluids Res Grp SERGAS UVIGO Vigo Spain Univ Porto Engn Fac Rua Dr Roberto FriasS-N P-4200465 Porto Portugal Inst Sci & Innovat Mech & Ind Engn LAETA INEGI Campus FEUPRua Dr Roberto Frias 400 P-4200465 Porto Portugal

Background and Objective: Coronary artery aneurysm is a progressive and often asymptomatic condition with a prevalence ranging from 0.3 % to 5 %. This condition can lead to severe and potentially fatal complications. Given the challenges of conducting experiments on real patients, numerical simulations have emerged as a valuable alternative. This study aims to enhance the accuracy of hemodynamic analysis and fluid-structure interaction assessments by incorporating the viscoelastic properties of blood, which are often overlooked, in simulations of the right coronary artery with various aneurysm morphologies. Methods: This research employs numerical simulations to analyse the hemodynamics and assess the one-way coupled fluid-structure interaction within the right coronary artery. The study utilised the simplified PhanThien/Tanner model to represent the viscoelastic properties of blood. Different aneurysm morphologies were simulated, and the results were compared with those obtained using the widely recognised Carreau model. The analysis focused on the time-average wall-shear stress, as well as the stress and deformation experienced by the aneurysm wall. Results: The hemodynamic analysis demonstrated that the simplified Phan-Thien/Tanner model produced similar flow patterns to the Carreau model but resulted in a significant reduction of approximately 50 % in the timeaverage wall-shear stress. This reduction aligns with previous findings. Additionally, the study revealed substantial differences in the stress and deformation of the aneurysm wall, with the simplified Phan-Thien/Tanner model proving more accuracy. The largest deformations were observed in aneurysms with incipient and fusiform shapes, particularly in the divergent section of the proximal region. In the case of saccular aneurysms, the most compromised area was identified not within the aneurysm sac itself, but in the region of the artery just upstream. Conclusions: Incorporating the viscoelastic properties o

关键词： Coronary aneurysm Viscoelasticity of blood fluid-structure interaction Hemodynamic simulations Aneurysm wall thickness

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fluid-structure interaction analysis of sensitive factors for circumferential slip instability of brush seals in gas turbine engines

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2025年第3期39卷 1541-1559页

作者： Liu, Yuxin Yue, Benzhuang Kong, Xiaozhi Zhu, Peng Northwestern Polytech Univ 127 West Youyi Rd Xian 710072 Peoples R China Dalian Maritime Univ 1 Linghai Rd Dalian 116026 Peoples R China

Brush seals in gas turbine engines offer effective sealing performance but may encounter instability at high swirl velocities, potentially leading to seal failure. This investigation employs fluid-structure interaction (FSI) analysis to examine the deformation of bristle packs under swirling flow conditions and evaluates the influence of geometric parameters through a design of experiments (DOE) methodology. The critical parameters encompass the bristle diameter, length, inclined angle, number of rows, radial clearance, and spacing between bristles. The findings of this study indicate that circumferential slip, associated with the normal-to-axial force ratio on the bristle pack, precipitates instability at elevated ratios. The spacing between the bristles and their inclination angle substantially affect the aerodynamic force ratio, with contributions of 26.5 % and 23.6 %, respectively. Radial clearance emerges as the predominant factor influencing leakage, explaining 74 % of its variability, with leakage increasing linearly with radial clearance. Structural optimization of the brush seal enhances aerodynamic stability and achieves a reduction in leakage of approximately 90 %.

关键词： Brush seals fluid-structure interaction Bristle deformation Circumferential slip DOE

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fluid-structure interaction analysis on flow field and vibration characteristics of gas proportional valve

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FLOW MEASUREMENT AND INSTRUMENTATION 2025年 101卷

作者： Liu, Fengguo Wan, Zhiyuan Cao, Shihua Zhao, Dongfang Liu, Guangqian Zhang, Keke Tianjin Chengjian Univ Sch Energy & Safety Engn Tianjin 300384 Peoples R China Tianjin Engn Ctr Nat Gas High Efficiency Utilizat Tianjin 300384 Peoples R China Guangzhou Jingding Elect Technol Co Ltd Guangzhou 510080 Peoples R China

Gas proportional valve (GPV) is used as the gas regulator for fully premixed low nitrogen condensing boiler, with the pressure regulation and flow output capacity determined by the condition of the valve core. To investigate the reliability of GPV valve core in engineering applications, this paper establishes three-dimensional models of the flow and solid fields, employing a coupled calculation method known as the two-way fluid-structure interaction method to analyze the characteristics of the flow field and the stability of the valve core. The results indicate that with the valve core opening, the vortex structures gradually form on both sides of the upper diaphragm, and the vibration strength of the valve core gradually increases with the formations of the vortices. The valve core vibrates the most strongly in the outflow direction, and the upper diaphragm oscillates between-0.05 mm and 0.03 mm. When the valve core is first opened to its maximum height, there will be a 0.2 mm impact rebound, and then gradually stabilize at the maximum opening position of 8 mm. Maximum stress always occurs at the stem to diaphragms connections, especially in the initial opening stage, where the stress reaching 5.17 MPa but remaining within the allowable limit of 30 MPa. This study also compares the flow field excitation with the valve core's natural frequency, identifying potential valve core resonance. This work provides valuable guidance for the flow field characteristics and valve core safety prediction of pneumatic GPVs.

关键词： Gas proportional valve fluid-structure interaction Flow field changes Vibration characteristics Modal analysis

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fluid-structure interaction analysis of an elastic surface-piercing propellers

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JOURNAL OF fluidS AND structureS 2025年 132卷

作者： Bushehri, M. Pakian Haghighi, M. R. Golbahar Malekzadeh, P. Bahmyari, E. Persian Gulf Univ Sch Engn Dept Mech Engn Bushehr *** Iran Persian Gulf Univ Sch Engn Dept Marine Engn Bushehr *** Iran

In high-speed planing craft, surface-piercing propellers (SPPs) operate semi-submerged in a twophase air-water environment, facing stress and displacement from variable forces. In this paper, the fluid-structure interaction (FSI) of the SPP is investigated at immersion ratios of 30 %, 50 %, 70 % and 90 %, under low and high advance coefficients. A coupling of Reynolds-averaged Navier-Stokes equations (RANS) and elasticity theory are used to simulate fluid dynamics and the blade deformation with the multi-physics computational fluid dynamics software STARCCM+. The analysis is performed after several rotations of the SPPs at five different positions. The results show that at the advance coefficient of 0.4, a higher immersion ratio increases torque, thrust, efficiency, maximum stress, and maximum displacement. When the advance coefficient is equal to one, the efficiency, maximum stress, and maximum displacement remain constant for the immersion ratio above 50 %. The maximum displacement occurs at the blade tip, while maximum stress is at the trailing edge root. Most blade deformations happen where the blade enters the water, aligns perpendicularly with the water surface, and exits. The two-phase flow around the blade increases its displacement.

关键词： Surface-piercing propellers Flexible blade Two-phase fluid fluid-structure interaction Reynolds-averaged Navier-Stokes equations Elasticity theory

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fluid-structure interaction and Heat Transfer Characteristics of a Thin Flexible Heater Submersed in Non-Newtonian fluids Inside a Shear-Driven Cavity

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HEAT TRANSFER 2025年第3期54卷 2354-2376页

作者： Chowdhury, Asif Shorforaj Nahin, Mohtasim Saib Ul Qaum, Md. Sameem Mahmood, Fahim Tanfeez Hasan, Mohammad Nasim Bangladesh Univ Engn & Technol BUET Dept Mech Engn Dhaka Bangladesh

This study examines fluid-structure interaction (FSI)-induced flow and heat transfer phenomena in a double-sided shear-driven, that is, lid-driven cavity filled with non-Newtonian power-law fluids. A flexible thin heater positioned at the center of the cavity serves as the heat source, while the moving side walls maintained at constant low temperature perform as a heat sink. The numerical approach adopts the finite element Galerkin method, integrating the Arbitrary Lagrangian-Eulerian framework with moving mesh technique to solve the associated flow, thermal, and stress fields. The thermoelastodynamic system behavior is analyzed through streamline, isothermal, and heater deformation visualizations, along with an evaluation of heat transfer performance, namely, the average Nusselt number. FSI-induced internal stress scenario in the heater is also studied in terms of maximum von Mises stress. Variation of system conditions necessarily includes mixed convection strength, shearing effect, fluid rheology, and flexibility of the heater manifested by four governing system parameters, namely, the Richardson number (0.1 <= Ri <= 10), Reynolds number (100 <= Re <= 300), power-law index (0.6 <= n <= 1.4), and Cauchy number (10(-4) <= Ca <= 10(-8)). The findings of this study reveal a significant improvement in heat transfer for shear-thinning fluids, with the most notable enhancement occurring at the highest Richardson number (Ri), where the heat transfer rate shows an increase of up to 33.33% compared with Newtonian fluids. The insights of this study might be helpful in heat transfer enhancement of industrial process equipment, particularly in applications such as food processing, electronics cooling, and chemical engineering, where non-Newtonian fluids are extensively used in reactors and related thermofluid systems.

关键词： arbitrary Lagrangian-Eulerian approach flexible heater fluid-structure interaction lid-driven cavity mixed convection non-Newtonian fluid

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fluid-structure interaction analysis of blood flow in collapsible channels: Implications for sports performance

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CHINESE JOURNAL OF PHYSICS 2025年 93卷 601-610页

作者： Huang, Rongbao Zhang, Bo Han, Xu Xing, Yizhou Zhu, Lei Hebei Finance Univ Dept Phys Educ & Teaching Baoding 071000 Hebei Peoples R China Neusoft Inst GuangDong Coll Basic Educ Phys Educ Dept Dongguan 523000 Guangdong Peoples R China Baoding 1 Cent Hosp Baoding 071000 Hebei Peoples R China

The flow of fluid in collapsible channels is a topic of great interest with numerous physiological applications, including blood flow during sports and exercise. This paper presents a fluid- structure interaction (FSI) model for the study of single-phase fluid flow through a micro- channel with a two-sided collapsible wall. The model considers the viscoelastic properties of the fluid and incorporates a moving mesh approach to analyze the deformation of the channel walls. Three distinct modes of motion are observed in the elastic walls involving the elastic walls bulge outward, they undergo a mode-2 deformation characterized by two half-wavelengths along the elastic walls, and the walls indent inward towards the channel. Furthermore, the study shows that as the Weissenberg number increased, there is an associated increase in pressure on the central part of the plate, particularly the major portion. This increase in pressure leads to a decrease in the deflection of the plate. Additionally, the results reveals that the thickness of the plate influences the wall deformations. Thicker plates exhibites minimal deformation compared to thinner plates, which display more pronounced deformations. Moreover, an increase in plate thickness results in a gradual upward (downward) movement of the lowest point of the upper wall (the highest point of the down wall), eventually shifting towards the midpoint of the elastic walls.

关键词： Biomedical engineering fluid-structure interaction Microchannel Elastic Wall Blood Sport

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fluid-structure interaction Analysis of Aerodynamic and Elasticity Forces During Vocal Fold Vibration

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JOURNAL OF VOICE 2025年第2期39卷 293-303页

作者： Sundstro, Elias Oren, Liran de Luzan, Charles Farbos Gutmark, Ephraim Khosla, Sid Univ Cincinnati Dept Otolaryngol Head & Neck Surg Cincinnati OH USA Univ Cincinnati Dept Aerosp Engn & Engn Mech Cincinnati OH USA

The effect of the intraglottal vortices on the glottal flow waveform was explored using flow-structure-interaction (FSI) modeling. These vortices form near the superior aspect of the vocal folds during the closing phase of the folds' vibration. The geometry of the vocal fold was based on the well-known M5 model. The model did not include a vocal tract to remove its inertance effect on the glottal flow. Material properties for the cover and body layers of the folds were set using curve fit to experimental data of tissue elasticity. A commercially available FSI solver was used to perform simulations at low and high values of subglottal input pressure. Validation of the FSI results showed a good agreement for the glottal flow and the vocal fold displacement data with measurements taken in the excised canine larynx model. The simulations result further support the hypothesis that intraglottal vortices can affect the glottal flow waveform, specifically its maximum flow declination rate (MFDR). It showed that MFDR occurs at the same phase when the highest intraglottal vortical strength and the negative pressure occur. It also showed that when MFDR occurs, the magnitude of the aerodynamic force acting on the glottal wall is greater than the elastic recoil force predicted in the tissue. These findings are significant because nearly all theoretical and computational models that study the vocal fold vibrations mechanism do not consider the intraglottal negative pressure caused by the vortices as an additional closing force acting on the folds.

关键词： VocaL foLd vIbraTionS InTragLottAl fLow fluid-structure interaction

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