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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 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 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 in a follow-up study of arterio-venous fistula maturation

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SCIENTIFIC REPORTS 2024年第1期14卷 1-20页

作者： Jodko, Daniel Barber, Tracie Lodz Univ Technol Inst Turbomachinery Wolczanska 217-221 PL-93005 Lodz Poland Univ New South Wales Sch Mech & Mfg Engn Sydney NSW 2052 Australia

Arteriovenous fistula (AVF) is the preferred vascular access for hemodialysed patients. AVF is created surgically using the patient's artery and vein. Once the connection (anastomosis) is made, the maturation process begins. Studies have shown that most AVFs do not survive beyond one year. This study presents fluid-structure interaction (FSI) modelling of non-Newtonian blood flow through an end-to-side radio-cephalic AVF, investigated weekly during a 15-week follow-up period and 1.5 years postoperatively using ultrasound methods. The aim was to collect qualitative and quantitative data regarding changes in hemodynamics and alterations in the walls of AVF vasculature. Different material properties were assigned to the artery, suture zone (anastomosis), and vein, while the stiffening of the venous arm over time was also modelled. The proposed FSI methodology can be implemented in future follow-up studies involving groups of patients. The main findings revealed: a) counter-rotating vortices in the anastomosis cross-section affecting local pressure conditions;b) different temporal progression of vorticity, shear strain rate, and turbulent kinetic energy and similarity of the temporal progression of WSS obtained under the assumptions of the rigid-walled and FSI;c) a negligible low-WSS zone in the presented thrombosis-free AVF;d) migration of the zone of maximal temporal wall deformation over time.

关键词： Arteriovenous fistula Non-Newtonian blood flow fluid-structure interaction Maturation Remodelling Turbulence kinetic energy

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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 model of blood flow in abdominal aortic aneurysms with thermic treatment

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ALEXANDRIA ENGINEERING JOURNAL 2023年 64卷 81-95页

作者： Alsabery, Ammar I. Ismael, Muneer A. Al-Hadraawy, Saleem K. Ghalambaz, Mohammad Hashim, Ishak Chamkha, Ali J. Islamic Univ Coll Tech Engn Refrigerat & Air conditioning Tech Engn Dept Najaf Iraq Univ Basrah Engn Coll Mech Engn Dept Basrah Iraq Univ Kufa Coll Sci Dept Biol Najaf Iraq Tomsk State Univ Lab Convect Heat & Mass Transfer Tomsk 634045 Russia Univ Kebangsaan Malaysia Fac Sci & Technol Dept Math Sci Ukm Bangi 43600 Selangor Malaysia Kuwait Coll Sci & Technol Fac Engn Doha Dist 35004 Kuwait

Hyperthermia is one of the non-invasive therapy of an Abdominal Aortic Aneurysm (AAA), which is achieved by applying a heat source upon the AAA without surgical operation. This research paper considers laminar flow and heat transfer in a heated abdominal aortic aneurysm using an isothermal boundary condition. Heat is added to explicate the thermal treatment of a dis-eased artery. The blood is assumed as a non-Newtonian fluid based on the shear-thinning Carreau model. Two unequal aneurysms are assumed in the lower wall to simulate bulges or a disordered artery. Flexible wall segments are assumed in the upper wall and opposing to each aneurysm. The transient momentum and energy equations are solved based on the fluid-structure interaction (FSI) using the Arbitrary-Lagrangian-Eulerian (ALE) method. It is found that the shear stress is much higher for a higher index of the power-law fluid governing the blood viscosity and hence, it is strictly recommended to reduce the viscous nature of the blood in diseased vessels. It is found also that the thermal energy can be greatly transported across the blood at a higher Reynolds num-ber, this means that the hyperthermia therapy becomes effective when blood flows violently through the aortic.(c) 2022 THE AUTHORS. Published by Elsevier BV on behalf of Faculty of Engineering, Alexandria University. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： Forced convection Heat transfer Carreau non-Newtonian model Blood flow fluid-structure interaction Abdominal aortic aneurysms

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fluid-structure interaction ANALYSIS OF CRESCENT-SHAPED WINGSAILS 43

FLUID-STRUCTURE INTERACTION ANALYSIS OF CRESCENT-SHAPED WING...

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ASME 43rd International Conference on Ocean, Offshore and Arctic Engineering (OMAE)

作者： Zhu, Heng Chernoray, Valery Ringsberg, Jonas W. Yao, Hua-Dong Ramne, Bengt Chalmers Univ Technol Dept Mech & Maritime Sci Gothenburg Sweden ScandiNAOS AB Gothenburg Sweden

ISBN: (纸本)9780791887844

The use of wind-assisted ship propulsion is regarded as one of the effective ways to reduce greenhouse gas emissions. This study combines wind tunnel experiments and advanced numerical simulations to investigate the model-scale effects and fluid-structure interaction (FSI) of a wingsail with a crescent-shaped profile. First, a wind tunnel test is carried out to study the aerodynamic loads and flutter of the wingsail. Next, a numerical method for analyzing FSI, fully coupling computational fluid dynamics and finite element analysis, is established. By comparing the experimental and numerical results, the model-scale effect that has an influence on the accuracy of prediction, e.g., laminar-turbulent transition, is discussed. Then, a full-scale FSI simulation based on a simplified solid model was performed to study the flutter and its influence on the propulsive performance. The results indicate that the crescent-shaped profile causes notable periodic oscillations due to strong flow separation, significantly affecting propulsive performance. These insights are crucial for the design and optimization of wingsail structures in enhancing windassisted ship propulsion.

关键词： fluid-structure interaction wind-assisted ship propulsion wingsail wind tunnel test

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fluid-structure interaction and experimental studies of passive check valve based piezoelectric micropump for biomedical applications

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ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES 2024年第3期10卷 2095-2121页

作者： Vante, Abhijeet B. B. Kanish, T. C. Vellore Inst Technol VIT Sch Mech Engn Vellore India

The piezoelectric micropump can be a prominent component of drug delivery systems due to its high performance, low cost, and faster response. However, backpressure remains to be the most common problem in micropump technology. Thus, microvalves or the passive check valve based piezoelectric micropump can be used to prevent the backpressure. However, the complex structure of the passive check valve based micropump limits the investigations of fluid-structure interaction (FSI) due to the intricate Multiphysics involved. This paper presents the investigations on the flow behaviour and performance of a passive check valve based piezoelectric micropump using numerical analysis. The simulation study comprising FSI depicts the performance of a piezoelectric micropump using a fluid-structure coupling, fluid selection, structural modelling, and piezoelectric equations. The simulation results illustrate the micropump performance characteristics such as piezoelectric actuator displacement, micropump flow rate, backpressure, and Von Mises stress. Experiments are conducted to validate simulation results by studying the effect of voltage and frequency on the micropump flow and pressure characteristics. The experimental study demonstrated that the passive check valve based piezoelectric micropump delivers a maximum flow rate of 32 ml/min at zero backpressure. The micropump can pump the fluid against maximum backpressure up to 35 kPa.

关键词： Micropump drug delivery piezoelectric fluid-structure interaction Multiphysics

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fluid-structure interaction Characterization in Serpentine Exhaust Nozzles

Fluid-Structure Interaction Characterization in Serpentine E...

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Asia-Pacific International Symposium on Aerospace Technology (APISAT)

作者： Zheng, Haibo Huang, Jiangtao He, Chengjun Gao, Chao Chen, Xian Northwestern Polytech Univ Xian 710072 Peoples R China China Aerodynam Res & Dev Ctr Mianyang 621000 Peoples R China

ISBN: (纸本)9789819740123;9789819740109;9789819740093

In order to explore the fluid-structure interaction (FSI) characteristics of serpentine nozzle, a numerical simulation framework of FSI for serpentine nozzle was constructed, and the changes of flow field characteristics and structural deformation in the nozzle under different pressure ratio states were studied. It is found that the complex geometry of the serpentine nozzle leads to the uneven distribution of internal flow parameters, and the structural deformation of the nozzle affects the internal aerodynamic load distribution of the nozzle. Under the action of the aerodynamic load of drastic changes in non-uniform flow, the nozzle is deformed, and the main deformation form is bulging from the inside to the outside, which further leads to the weakening of the expansion degree of flow in the nozzle and the increase of pressure. With the gradual increase of the inlet pressure ratio, the maximum deformation also increases, and the maximum deformation is about 2.9 mm, reaching 5% of the outlet height of the nozzle.

关键词： Serpentine Nozzle fluid-structure interaction Nozzle Pressure Ratio Aerodynamic Load

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fluid-structure interaction Analysis of a Fabric Skin for Fabric-Covered Wind Turbine Blades

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INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES 2022年第1期23卷 92-101页

作者： Choi, Dong-Kuk An, Hyung-Ju Lee, Soo-Yong Bae, Jae-Sung Korea Aerosp Univ Sch Aerosp & Mech Engn 76 Hanggongdaehak Ro Goyang Si 10540 Gyeonggi Do South Korea

Wind turbines are becoming larger to produce more power from the wind in a given area. While the large-size wind turbines are advantageous in terms of generating power, the blades are very heavy and difficult to transport and install. General Electric Co. and the National Renewable Energy Laboratory proposed a new blade design and manufacturing concept that covers the blade with tensioned fabrics. This fabric-covered wind turbine blade is composed of spar-rib structures and covering fabric skins. The present study investigates the aerodynamic effects of fabric skin. A fluid-structure interaction (FSI) analysis was performed about the fabric skin of a large-sized fabric-covered blade. Through static and dynamic FSI analyses, the response of the fabric skin was analyzed according to the wind speeds. The natural frequencies and mode shapes were compared. It was confirmed that the tension of the fabric skin should be increased as much as possible to maintain aerodynamic efficiency, and in addition that the natural frequencies and mode shapes were changed by the wind speeds.

关键词： Wind turbine Blade Fabric-covered blade Membrane structure Fabric skin fluid-structure interaction

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