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fluid-structure interaction modeling of lactating breast: Newtonian vs. non-Newtonian milk

JOURNAL OF BIOMECHANICS 2021年 124卷 110500-110500页

作者： Azarnoosh, Jamasp Hassanipour, Fatemeh Univ Texas Dallas Dept Mech Engn 800 W Campbell Rd Richardson TX 75080 USA

Breastfeeding is a highly dynamic and complex mechanism. The suckling process by the infant involves compression and intra-oral vacuum pressure, leading to milk expression from breast. The accumulated milk from the nipple varies depending on the milk properties and transient flow rate during the suckling cycle. Rheological studies on raw human milk indicate that milk has a non-Newtonian shear-thinning flow behavior. This study aims to investigate the effect of non-Newtonian milk on flow behavior through the breast ductal system using fluid-structure interaction (FSI) simulation. The results of the non Newtonian effects on flow velocity and the volumetric flow rate of expressed milk are presented. The results show that non-Newtonian Carreau model is promising for the simulation of human milk flow through the breast ductal systems. Also, the results show that the non-Newtonian effects on the milk flow behavior appear for 30-35% of the suckling cycle. Therefore, the Newtonian model is acceptable for the purpose of numerical simulation. (c) 2021 Elsevier Ltd. All rights reserved.

关键词： Non-Newtonian fluid Human milk Computational fluid dynamics fluid-structure interaction

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Failure investigation and stresses in abdominal aortic aneurysms fluid-structure interaction biomechanics: Effect of nonlinear material properties and presence of intraluminal thrombus

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Procedia Structural Integrity 2023年 45卷 88-95页

作者： Xiaochen Wang Mergen H. Ghayesh Andrei Kotousov Anthony C. Zander Peter J. Psaltis School of Electrical and Mechanical Engineering University of Adelaide Adelaide SA 5005 Australia Vascular Research Centre Lifelong Health Theme South Australian Health & Medical Research Institute (SAHMRI) Adelaide SA 5000 Australia Adelaide Medical School University of Adelaide Adelaide SA 5005 Australia

Abdominal aortic aneurysm (AAA) rupture has become a prevalent cause of death and is responsible for approximately 200,000 deaths annually worldwide. Due to the fact that abdominal aortic aneurysms are permanent progressive dilatations and asymptomatic until rupture, there is a rising need to study the characteristics of the mechanics of disease so that it can be recognised earlier on, thus preventing the patients from risks. This paper analyses the relationship between the nonlinear material hyperelasticity variability and the presence of intraluminal thrombosis (ILT) in a biomechanical computational model of an abdominal aortic aneurysm via the fluid-structure interaction technique. Current clinical interventions of AAA highly rely on the aneurysm size; however, evidence has shown that many small lesions rupture. One possible cause of this phenomenon is ILT, as in over 70% of patients with AAA, ILT can be found and presented irregular covered on the intimal side of AAA. Moreover, the embedded fibres in the artery wall exhibit anisotropy, and neglecting fibre dispersion can oversimplify the results of AAA modelling. The biomechanical model presented in this work takes into account viscoelastic artery wall, pulsatile fluid velocity and pressure, non-Newtonian behaviour of blood, and interaction between the blood and the artery wall. The impact on wall stresses, deformation and flow patterns are focused and compared to conduct this sensitivity analysis of numerical prediction. The results demonstrate that the presence of an ILT significantly affects the risk of rupture and the variability of the material hyperelasticity

关键词： abdominal aortic aneurysm biomechanics finite element analysis fluid-structure interaction intraluminal thrombus sensitivity study rupture risks failure investigation

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Analysis of hydrofoil fluid structure interaction locking by dynamic mode decomposition

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OCEAN ENGINEERING 2025年 327卷

作者： Wang, Zibin Li, Fugeng Ning, Xiaoshen Hu, Jian Zhang, Weipeng Harbin Engn Univ Coll Shipbldg Engn Harbin 150001 Heilongjiang Peoples R China

At a particular Reynolds number, vortex shedding induces locking, causing fatigue damage to structures within the flow field and producing pronounced noise. To investigate the vortex-induced vibration characteristics of viscous fluids, this study employs a two-dimensional hydrofoil model. Moreover, structural deformation is calculated under multiple natural frequencies. When the vortex frequency approaches the first natural frequency, the vortex shedding shifts from free shedding to coupled shedding. Additionally, locking is observed near higher natural frequencies. In the board band between the above two natural frequencies, the shedding frequency conforms to Strouhal's law. The dynamic mode decomposition results of the velocity field reveal the presence of distinctive small-scale fluctuations near the shedding frequency and natural frequency coupling.

关键词： Vortex induced vibration Locking fluid-structure interaction Dynamic mode decomposition

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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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fluid-structure interaction analysis of coriolis mass flowmeter

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INTERNATIONAL JOURNAL OF MODERN PHYSICS B 2020年第14-16期34卷

作者： Huang, Tian-Xing Reny, Jian-Xin Zhangz, Pei Northwestern Polytech Univ Sch Automat Xian Peoples R China

Coriolis mass flowmeter (CMF) is widely used in the industrial field. In mass flow measurement, there are many impurities in measured fluids that will adhere to the inner wall of the vibrating tube of CMF. The vibration characteristics of CMF would change due to the structural change, i.e., wall clung state, which will generate the wall clung state fault. In this paper, aiming at the wall clung state fault of CMF, the finite element model of CMF is established based on ANSYS. The velocity distribution of fluid in the vibrating tube of CMF is analyzed, considering the fluid{structure interaction. The location of the wall clung state in a vibrating tube is determined. Then, the fault model is established. The mechanism of the vibration transmission characteristics outwards of CMF caused by the wall clung state is analyzed by harmonic response analysis. Finally, the failure mode of CMF is investigated.

关键词： ANSYS Coriolis mass flowmeter fluid-structure interaction transmitted vibration harmonic response failure analysis

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fluid-structure interaction and stress analysis of a floating wind turbine

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MARINE structureS 2021年 78卷

作者： Wiegard, B. Konig, M. Lund, J. Radtke, L. Netzband, S. Abdel-Maksoud, M. Duester, A. Hamburg Univ Technol TUHH Inst Ship Struct Design & Anal Schwarzenberg Campus 4 C D-21073 Hamburg Germany Hamburg Univ Technol TUHH Inst Fluid Dynam & Ship Theory Schwarzenberg Campus 4 C D-21073 Hamburg Germany

In this paper, we describe a method to investigate the fluid-structure interaction of a floating wind turbine and to analyze the global deformations and the corresponding stresses with a detailed finite element model. To solve the fluid-structure interaction problem, a partitioned approach is chosen. The in-house C++ library comana, which was developed to solve multi-physic problems by coupling existing solvers, is extended to couple the fluid solver panMARE and the structural solver ANSYS. The significance of the interaction of structural deformations and the fluid loads is pointed out for the rotor of the wind turbine. In order to enable the use of a detailed finite element model in the fluid-structure interaction simulation, a model reduction method is applied in ANSYS. As a result, an efficient stress analysis can be performed under consideration of the fluidstructure interaction.

关键词： fluid-structure interaction Stress analysis Self-aligning floating wind turbine Partitioned solution approach Superelement

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Optimizing Sensitivity in a fluid-structure interaction-Based Microfluidic Viscometer: A Multiphysics Simulation Study

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SENSORS 2023年第22期23卷 9265页

作者： Mustafa, Adil Uslu, Merve Ertas Tanyeri, Melikhan Univ Bristol Dept Engn Math Bristol BS8 1TW England Duquesne Univ Sch Sci & Engn Dept Biomed Engn Pittsburgh PA 15282 USA

fluid-structure interactions (FSI) are used in a variety of sensors based on micro- and nanotechnology to detect and measure changes in pressure, flow, and viscosity of fluids. These sensors typically consist of a flexible structure that deforms in response to the fluid flow and generates an electrical, optical, or mechanical signal that can be measured. FSI-based sensors have recently been utilized in applications such as biomedical devices, environmental monitoring, and aerospace engineering, where the accurate measurement of fluid properties is critical to ensure performance and safety. In this work, multiphysics models are employed to identify and study parameters that affect the performance of an FSI-based microfluidic viscometer that measures the viscosity of Newtonian and non-Newtonian fluids using the deflection of flexible micropillars. Specifically, we studied the impact of geometric parameters such as pillar diameter and height, aspect ratio of the pillars, pillar spacing, and the distance between the pillars and the channel walls. Our study provides design guidelines to adjust the sensitivity of the viscometer toward specific applications. Overall, this highly sensitive microfluidic sensor can be integrated into complex systems and provide real-time monitoring of fluid viscosity.

关键词： microfluidic viscometer fluid-structure interaction micropillar deflection multiphysics simulations

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Enhancing heat transfer in L-shaped enclosures with combined natural convection-fluid structure interaction: Incorporating flexible fin and elastic wall

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NUMERICAL HEAT TRANSFER PART A-APPLICATIONS 2024年

作者： Ahmed, Ahmed Qasim Razavi, Seyed Esmail Univ Tabriz Dept Mech Engn Tabriz *** Iran

In the present investigation, a numerical investigation of the flow and heat transfer characteristics inside an L-shaped enclosure with a flexible fin and an elastic wall has been carried out using the finite element method. The fluid-structure interaction model is used to capture the interaction between the fluid and the solid structure. The free end of the flexible fin is exposed to sinusoidal vertical force and the upper wall of the enclosure is considered to be elastic and a sinusoidal force is applied on this elastic wall. The obtained results showed that the fluid flow through the enclosure is entirely influenced by the periodic oscillation of the flexible fin and elastic wall. Besides, the Nusselt number over the horizontal and vertical hot walls of the L-shaped enclosure is strongly affected by the amplitude and frequency of the applied sinusoidal forces on the flexible fin and elastic wall. The heat transfer over the vertical hot wall is enhanced considerably with an increase in the amplitude and frequency of the applied sinusoidal forces. Moreover, the Nusselt number over the hot vertical wall is increased with the decrease of the elastic modulus value of the elastic wall. The results also show that the combination of the flexible fin and elastic wall has contributed to the extra enhancement of the Nusselt number over the hot vertical wall of the L-shaped enclosure.

关键词： Elastic wall enclosure fin flexible fluid-structure interaction natural convection

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The Effect of Subglottic Stenosis Severity on Vocal Fold Vibration and Voice Production in Realistic Laryngeal and Airway Geometries Using fluid-structure-Acoustics interaction Simulation

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APPLIED SCIENCES-BASEL 2025年第3期15卷

作者： Bodaghi, Dariush Xue, Qian Thomson, Scott Zheng, Xudong Univ Maine Dept Mech Engn Orono ME 04473 USA Rochester Inst Technol Dept Mech Engn Rochester NY 14623 USA Brigham Young Univ Idaho Dept Mech & Civil Engn Rexburg ID 83460 USA

This study investigates the impact of subglottic stenosis (SGS) on voice production using a subject-specific laryngeal and airway model. Direct numerical simulations of fluid-structure-acoustic interaction were employed to analyze glottal flow dynamics, vocal fold vibration, and acoustics under realistic conditions. The model accurately captured key physiological parameters, including the glottal flow rate, vocal fold vibration patterns, and the first four formant frequencies. Simulations of varying SGS severity revealed that up to 75% stenosis, vocal function remains largely unaffected. However, at 90% severity, significant changes in glottal flow and acoustics were observed, with vocal fold vibration remaining stable. At 96%, severe reductions in glottal flow and acoustics, along with marked changes in vocal fold dynamics, were detected. Flow resistance, the ratio of glottal to stenosis area, and pressure drop across the vocal folds were identified as critical factors influencing these changes. The use of anatomically realistic airway and vocal fold geometries revealed that while anatomical variations minimally affect voice production at lower stenosis grades, they become critical at severe stenosis levels (>90%), particularly in capturing distinct anterior-posterior opening patterns and focused jet effects that alter glottal dynamics. These findings suggest that while simplified models suffice for analyzing mild to moderate stenosis, patient-specific geometric details are essential for accurate prediction of vocal fold dynamics in severe cases.

关键词： subglottic stenosis voice production subject-specific simulation fluid-structure interaction

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fluid-structure interaction of Circular Cylinder Flow with Bidirectional Splitter Plates

Fluid-Structure Interaction of Circular Cylinder Flow with B...

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Global OCEANS Singapore - U.S. Gulf Coast Conference

作者： Dang, Zhigao Mao, Zhaoyong Song, Baowei Tian, Wenlong Northwestern Polytech Univ Sch Marine Sci & Technol Xian Peoples R China

ISBN: (纸本)9781728154466

Flow past a circular cylinder is a classical topic in ocean engineering application, such as the marine riser, oil pipeline, etc. When the ocean current flows around cylinder structures, shedding vortices will appear alternately in the wake of the cylinder at a certain Reynolds number, which is harmful to the service life of ocean engineering structures. Among the abundant active and passive methods of flow control, the splitter plate behind the circular cylinder is a popular choice to improve the flow field of the circular cylinder. It should be noted that the motions of the splitter plate are neglected because most of the present studies treat the splitter plate as rigid body. Therefore, the fluid-structure interaction (FSI) effect between the fluid and the splitter plate is taken into account in the present study. What's more, a new idea with bidirectional splitter plates are proposed to improve the flow field with beneficial effects. Correspondingly, the relationships between the ratios of RMS lift and mean drag coefficients by original circular cylinder with different configurations of the splitter plate are given.

关键词： circular cylinder fluid-structure interaction splitter plate lift drag

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