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fluid-structure interaction investigation for coal-water slurry preheaters: Effects of different loads on mechanical performance

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NUMERICAL HEAT TRANSFER PART A-APPLICATIONS 2024年第1期85卷 42-59页

作者： Xiao, Juan Duan, Xudong Wang, Simin Zhang, Zaoxiao Xi An Jiao Tong Univ Sch Chem Engn & Technol Xian Peoples R China Xi An Jiao Tong Univ Sch Chem Engn & Technol 28 Xianning West Rd Xian 710049 Shaanxi Peoples R China

The mechanical performance caused by fluid pressure or uneven temperature in heat exchangers is important to predict dangerous locations and guide the manufacture or installation. Under the background of coal-water slurry (CWS) preheating technology, using fluid-structure interaction, the distribution law, and mechanism of von Mises stress and deformation for CWS preheaters under different loads were studied, and sensitivity analysis combining metamodel of prognosis was carried out to determine the most influential parameters on mechanical performance. The results illustrate maximum von Mises stress under coupled pressure and temperature occurs at the perforated location on the baffle closed to the shell outlet, but maximum total deformation is located at the outer edge of the baffle near the shell inlet. When the folding angle, folding ratio, relative height is 30 & DEG;, 0.4, and 0.5, respectively, under coupled loads, the thermal stress is dominant at lower velocity, and total deformation caused by the pressure is dominant at all different shell-inlet velocities. With increasing shell-inlet velocity, maximum von Mises stress decreases first and then increases, and maximum total deformation increases. The shell-inlet velocity and relative height are the most influential and non-influential parameters, respectively, for maximum total deformation. The research lays the foundation of mechanical analysis for material failure, structure destruction, and parameter screening of design variables for CWS preheaters.

关键词： fluid-structure interaction heat exchanger mechanical performance metamodel sensitivity analysis

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fluid-structure interaction Within Models of Patient-Specific Arteries: Computational Simulations and Experimental Validations

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IEEE REVIEWS IN BIOMEDICAL ENGINEERING 2024年 17卷 280-296页

作者： Schoenborn, Sabrina Pirola, Selene Woodruff, Maria A. Allenby, Mark C. Univ Queensland UQ Sch Chem Engn BioMimet Syst Engn BMSE Lab St Lucia Qld 4072 Australia Queensland Univ Technol QUT Fac Engn Ctr Biomed Technol Biofabricat & Tissue Morphol BTM Grp Kelvin Grove Qld 4059 Australia Imperial Coll London Inst Clin Sci Fac Med BHF Ctr Res Excellence South Kensington Campus London SW7 2AZ England Imperial Coll London Dept Chem Engn South Kensington Campus London SW7 2AZ England

Cardiovascular disease (CVD) is the leading cause of mortality worldwide and its incidence is rising due to an aging population. The development and progression of CVD is directly linked to adverse vascular hemodynamics and biomechanics, whose in-vivo measurement remains challenging but can be simulated numerically and experimentally. The ability to evaluate these parameters in patient-specific CVD cases is crucial to better predict future disease progression, risk of adverse events, and treatment efficacy. While significant progress has been made toward patient-specific hemodynamic simulations, blood vessels are often assumed to be rigid, which does not consider the compliant mechanical properties of vessels whose malfunction is implicated in disease. In an effort to simulate the biomechanics of flexible vessels, fluid-structure interaction (FSI) simulations have emerged as promising tools for the characterization of hemodynamics within patient-specific cardiovascular anatomies. Since FSI simulations combine the blood's fluid domain with the arterial structural domain, they pose novel challenges for their experimental validation. This paper reviews the scientific work related to FSI simulations for patient-specific arterial geometries and the current standard of FSI model validation including the use of compliant arterial phantoms, which offer novel potential for the experimental validation of FSI results.

关键词： Peripheral artery disease blood flow computational fluid dynamics fluid-structure interaction cardiovascular biomechanics

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fluid-structure interaction study on the causes of mending material damage after sigmoid sinus wall reconstruction

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COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2024年 245卷 108040-108040页

作者： Xu, Kaihang Qiu, Xiaoyu Dai, Chihang He, Kaixuan Wang, Guopeng Mu, Zhenxia Gao, Bin Gong, Shusheng Wang, Zhenchang Zhao, Pengfei Beijing Univ Technol Fac Environm & Life Beijing 100124 Peoples R China Capital Med Univ Beijing Friendship Hosp Dept Radiol 95 Yongan Rd Beijing 100050 Peoples R China Capital Med Univ Beijing Friendship Hosp Dept Otorhinolaryngol Head & Neck Surg 95 Yongan Rd Beijing 100050 Peoples R China Shandong First Med Univ Dept Radiol Shandong Prov Hosp Jinan 250021 Peoples R China

Background and objective: Sigmoid Sinus (SS) Wall Reconstruction (SSWR) is the mainstream treatment for pulsatile tinnitus (PT), but it has a high risk of recurrence. The damage of mending material is the key cause of recurrence, and its hemodynamic mechanism is still unclear. The purpose of this study was to investigate the hemodynamic causes of mending material breakage. Methods: In this study, six patient-specific geometric models were reconstructed based on the data of the computed tomography angiography (CTA). The transient fluid-structure coupling method was performed to clarify the hemodynamic state of sigmoid sinus and the biomechanical state of the mending material. The distribution of stress and displacement and the flow pattern were calculated to evaluate the hemodynamic and biomechanics difference at the mending material area. Results: The area of blood flow impact in some patients (2/6) was consistent with the damaged location of the mending material. The average stress (6/6) and average displacement (6/6) of damaged mending material were higher than those of complete mending material. All (6/6) patients showed that the high-stress and highdisplacement proportion of the DMM region was higher than that of the CMM region. Moreover, the average stress fluctuation (6/6) and average displacement (6/6) fluctuation degree of damaged mending material is larger than that of complete mending material. Conclusions: The impact of blood and the uneven stress and displacement fluctuation of the mending material may be the causes of mending material damage. High stress and high displacement might be the key causes of the mending material damage.

关键词： Pulsatile tinnitus Sigmoid sinus wall reconstruction Mending material damage fluid-structure interaction Biomechanical

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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 modeling with nonmatching interface discretizations for compressible flow problems: simulating aircraft tail buffeting

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COMPUTATIONAL MECHANICS 2024年第2期74卷 367-377页

作者： Rajanna, Manoj R. Jaiswal, Monu Johnson, Emily L. Liu, Ning Korobenko, Artem Bazilevs, Yuri Lua, Jim Phan, Nam Hsu, Ming-Chen Global Engn & Mat Inc Princeton NJ 08540 USA Iowa State Univ Dept Mech Engn Ames IA 50011 USA Univ Notre Dame Dept Aerosp & Mech Engn Notre Dame IN 46556 USA Univ Calgary Dept Mech & Mfg Engn Calgary AB T2N 1N4 Canada Brown Univ Sch Engn Providence RI 02912 USA Naval Air Syst Command NAVAIR Struct Div Patuxent River MD 20670 USA

Many aerospace applications involve complex multiphysics in compressible flow regimes that are challenging to model and analyze. fluid-structure interaction (FSI) simulations offer a promising approach to effectively examine these complex systems. In this work, a fully coupled FSI formulation for compressible flows is summarized. The formulation is developed based on an augmented Lagrangian approach and is capable of handling problems that involve nonmatching fluid-structure interface discretizations. The fluid is modeled with a stabilized finite element method for the Navier-Stokes equations of compressible flows and is coupled to the structure formulated using isogeometric Kirchhoff-Love shells. To solve the fully coupled system, a block-iterative approach is used. To demonstrate the framework's effectiveness for modeling industrial-scale applications, the FSI methodology is applied to the NASA Common Research Model (CRM) aircraft to study buffeting phenomena by performing an aircraft pitching simulation based on a prescribed time-dependent angle of attack.

关键词： fluid-structure interaction Compressible flow Isogeometric shell Nonmatching interface Aircraft buffeting NASA Common Research Model

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fluid-structure interaction of spherical pressure hull implosion in deep-sea pressure: Experimental and numerical investigation

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OCEAN ENGINEERING 2024年 291卷

作者： Zheng, Jiancai Zhao, Min Shanghai Jiao Tong Univ Sch Naval Architecture State Key Lab Ocean Engn Ocean & Civil Engn Shanghai 200240 Peoples R China

Implosion may occur when a hollow pressure structure with geometric imperfections works in deep-sea environments. Therefore, the implosion phenomenon and failure mechanisms of a titanium alloy spherical pressure hull are investigated by experiments and developed numerical methods in ultra-high-pressure water conditions. Firstly, the experiments were conducted using a full-ocean-depth sea environment simulator. Then the validity of the numerical analysis were demonstrated by comparing the shock wave of fluid and destroyed fragments of structure. Finally, the characteristics of underwater implosion were examined under different hydrostatic pressures, including the propagation of shock waves, high-speed motion of the compressible flow, nonlinear deformation of the spherical pressure hull, and energy balance and evolution. The results showed that the vertical impact effect occurs during the underwater implosion of a metallic sphere. Moreover, the shock wave emerges earlier and the cracks break into smaller fragments with the increase of hydrostatic pressure. Besides, the smaller volume of the air cavity is compressed and the larger amplitude of potential energy is dropped when the hydrostatic pressure is larger. Meanwhile, the internal energy of air and structure increases, while the internal and kinetic energy of air oscillates slightly due to the pulsation characteristics of the air cavity.

关键词： fluid-structure interaction Underwater implosion Spherical pressure hull Deep-sea environment

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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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fluid-structure interaction analysis of a lightweight sandwich composite structure for solar central receiver heliostats

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MECHANICS BASED DESIGN OF structureS AND MACHINES 2023年第10期51卷 5737-5766页

作者： Fadlallah, Sulaiman O. Anderson, Timothy N. Nates, Roy J. Univ Huddersfield Sch Comp & Engn Huddersfield W Yorkshire England Auckland Univ Technol Dept Mech Engn Auckland New Zealand

Central tower concentrating solar power systems are moving to the forefront to become the technology of choice for generating renewable electricity, but their widespread implementation is limited by cost. Heliostats contribute almost 50% to the plant's cost and are thus the most significant element in central tower systems. For both large and small-area heliostats, the drive elements demonstrate the largest cost element in these systems. While large-area heliostats (>100 m(2)) have proven offer the best economy compared to other sizes, they require high-torque drives due to the heavy steel-based support structure. Heliostat costs could be reduced by decreasing the support structure's weight, avoiding large drive units and reducing energy consumption. However, the structure must be able to cope with the aerodynamic loads imposed upon them during operation. Although honeycomb sandwich composites have been widely used where high structural rigidity and low weight are desired, there is an absence of studies that rigorously investigated their suitability as the structure for heliostat mirror. Here, a fluid-structure interaction study investigated, for several loading conditions at various tilt and wind incidence angles, the aero-structural behavior characteristics of honeycomb sandwich composites used as a heliostat support structure. The honeycomb sandwich panel showed markedly different behavior characteristics at various operational conditions. The effect of tilt orientation on the sandwich panel's maximum deflection and stresses became more pronounced as wind velocity increased above 10 m/s, and increasing wind incidence angle reduced their magnitudes at different rates. The supporting components and torque tube had a noticeable wind-shielding effect, causing pronounced changes in the deflection and stresses experienced by the heliostat. The worst operational condition was at a tilt angle of 30 degrees with wind flow of 20 m/s at 0 degrees to the heliostat surface. H

关键词： Heliostat lightweight sandwich composite honeycomb fluid-structure interaction

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fluid-structure interaction Simulation of Mitral Valve structures in a Left Ventricle Model

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2025年第8期126卷

作者： Kronborg, Joel Hoffman, Johan KTH Royal Inst Technol Computat Sci & Technol Stockholm Sweden

Simulations of blood flow in patient-specific models of heart ventricles is a rapidly developing field of research, showing promise to improve future treatment of heart diseases. fluid-structure interaction simulation of the mitral valve, with its complex structure including leaflets, chordae tendineae, and papillary muscles, provides additional prospects as well as challenges to such models. In this study, we combine a patient-specific model of the left ventricle with an idealized unified continuum fluid-structure interaction model of the mitral valve, to simulate the intraventricular diastolic blood flow. To the best of our knowledge, no monolithic fluid-structure interaction model, without the need for remeshing, has ever been used before to simulate the native mitral valve within the left ventricle. The chordae tendineae are simulated as a region of porous medium, to partially hinder the flow. Simulation results from this model are compared to those of a model with the same patient-specific left ventricle, but with the mitral valve simply modeled as a time-variant inflow boundary condition. The blood flow is analyzed with the E-wave propagation index, and by use of the triple decomposition of the velocity gradient tensor, which decomposes the flow into rigid body rotational flow, shearing flow, and irrotational straining flow. The triple decomposition enables analysis of the formation of initially large dominant flow features, such as the E-wave jet and the vortex ring around it, and their subsequent decay into smaller turbulent flow structures. This analysis of the development of flow structures over the duration of diastole appears to be in general agreement with the theory of the stability of rotation, shear, and strain structures. Elevated shear levels are investigated, but are found only in limited amounts that do not indicate significant risks of thrombus formation or other blood damage, which is to be expected in this healthy ventricle. The highest shear

关键词： computational fluid dynamics digital twins E-wave propagation index fluid-structure interaction hemodynamics mitral valve triple decomposition of the velocity gradient tensor

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