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Numerical Investigations of a Column Configuration with Towed Super Long Cable in Underwater Environment

JOURNAL OF MARINE SCIENCE AND ENGINEERING 2025年第3期13卷 592-592页

作者： Xue, Xiaopeng Yu, Yue Zhao, Danjun Yang, Degui Qi, Libo Cent South Univ Sch Automat Changsha 410083 Peoples R China Hunan Prov Key Lab Opt Elect Intelligent Measureme Changsha 410083 Peoples R China China Ship Sci Res Ctr Wuxi 214082 Peoples R China State Key Lab Deep Sea Manned Vehicles Wuxi 214082 Peoples R China

In the present study, a simple immersion boundary method was developed to numerically simulate the fluid-structure-acoustic coupling problem of underwater vehicles and their towed super long cables. A typical underwater vehicle connected with different cable models at different positions was created in this study. The length of the vehicle is 4356 mm, the cables are approximately 4 and 6 times the vehicle length, i.e., 17,424 mm and 26,136 mm, and the freestream velocity is 7.72 m/s (15 kts). In the simulation, the freestream velocities are 9.26 m/s (18 kts), 7.72 m/s (15 kts), and 5.14 m/s (10 kts), respectively. The models are numerically simulated by a simple immersion boundary method to solve the flow field structure, the velocity profile, and the transverse flow near the towed cable, compute the pressure pulsation of the cable models with huge lengths and extremely small diameters, and analyze their flow noise. The results show that the towed cables with different lengths have a relatively small impact on the velocity distribution around the underwater vehicle system;however, the transverse flow occurs near the cable, thereby affecting the pressure pulsation changes and causing significant flow noise problems. Furthermore, it was also found that the closer the connection position of the towed cable is to the center position, the more significant the impact on the downstream flow fields and the higher the sound pressure level of the flow noise.

关键词： towing super long cable underwater vehicle fluid-structure interaction immersion boundary method flow noise analysis

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Nonlinear vibration of wire-wrapped fuel rod subjected to axial flow

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ALEXANDRIA ENGINEERING JOURNAL 2025年 112卷 448-460页

作者： Zhang, Yu Li, Pengzhou Nucl Power Inst China Chengdu 610213 Peoples R China

Wire-wrapped fuel rods are widely utilized in lead-bismuth reactors and subjected to high kinetic energy fluid flow, significantly influencing the reactor's safe operation. This study addresses the increasing interest in fuel assemblies by developing a theoretical fluid-structure interaction model to elucidate the dynamic behavior of wire-wrapped fuel rods. Newton's law is employed to derive the governing equation, with fluid force coefficients determined through widely accepted numerical simulations, while the impact and downstream nonlinear boundary condition are incorporated. Two comparative analyses robustly validate the reliability of the proposed model. Building on this model, the study investigates the nonlinear vibration characteristics (amplitude, phase space, impact forces, etc.) of the structure, considering the effects of gap size and streamlining parameter. Moreover, the theoretical derivation of this model provides a foundational and dependable mathematical framework to facilitate further research on fretting wear.

关键词： fluid-structure interaction Wire-wrapped fuel rod Theoretical model Nonlinear vibration Lead-bismuth reactor

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A Review on Research of Load Reduction and Ballistic Stability During Cross-Media Water Entry Processes

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JOURNAL OF MARINE SCIENCE AND ENGINEERING 2025年第4期13卷 703-703页

作者： Lu, Qingxia Ma, Xiaojian Zhao, Jing Shen, Lin China Acad Launch Vehicle Technol Res & Dev Ctr Beijing 100076 Peoples R China

The cross-media water entry problem widely exists in fields such as ocean engineering and aerospace. The highly non-stationary characteristics of the cross-media water entry process significantly influence the structural strength and ballistic stability of vehicles. This paper selects air-dropped torpedoes, supercavitating vehicles, and high-speed projectiles as three typical types of cross-media vehicles for study. Based on their unique structural characteristics and typical water entry conditions, this paper focuses on the current status of their respective impact load and load reduction challenges, as well as water entry ballistic stability issues. At the research methodological level, this paper systematically reviews the progress of current research in three directions: theory, experiments, and numerical simulations, and introduces the application of artificial intelligence in solving cross-media problems. Finally, this paper looks forward to future development trends in cross-media water entry research, aiming to provide a reference for structural optimization design, motion stability control, and other related studies of cross-media vehicles.

关键词： cross-media water entry water entry load load reduction strategy ballistic stability cavity evolution scaled-down test fluid-structure interaction artificial intelligence

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Analysis of Wind-Induced Vibration Response of Transmission Wire Under Crosswind in Canyon Terrain

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APPLIED SCIENCES-BASEL 2025年第7期15卷 3902-3902页

作者： Chen, Jianhui Zhou, Chaohui Changzhou Univ Sch Mech Engn & Rail Transit Changzhou 213164 Peoples R China

The conventional unidirectional coupling method, which separates the flow field from the solid, is generally used for calculations to study the wind-induced response of overhead transmission wires in complex micro-terrain conditions. This study constructed a calculation method for the strong bidirectional coupling of vibrations in canyon terrain based on the bidirectional coupling theory and analyzed the vibration characteristics of a transmission wire under step and pulse wind speed conditions. The simulation results show that the wire's displacement trend was basically the same and the oscillation period was the same under different step wind speed conditions. The influence of the pulse width on the wire displacement was periodic under pulse wind speed conditions, and the pulse amplitude affected the displacement amplitude.

关键词： canyon terrain wind field fluid-structure interaction step wind pulse wind

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Investigations on fluid-induced vibrations of multi-row helical tube bundles in lead-bismuth eutectic flow with one-way coupling simulations

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PROGRESS IN NUCLEAR ENERGY 2025年 180卷

作者： Yang, Guangchao Zhang, Ke Yu, Xiaofei Bu, Shanshan Chen, Guo Chen, Deqi Chongqing Univ Key Lab Low Grade Energy Utilizat Technol & Syst Chongqing 400044 Peoples R China Chongqing Univ Dept Nucl Engn & Technol Chongqing 400044 Peoples R China Nucl Power Inst China Sci & Technol Reactor Syst Design Technol Lab Chengdu 610200 Peoples R China

fluid-induced vibrations (FIV) around helical tube bundles are common in engineering. Traditionally, most of the studied fluid media are water and air, but in recent years, the liquid lead-bismuth eutectic (LBE) has gradually become an emerging heat exchange medium. The flow-induced vibration phenomenon of multi-row helical tube bundles in the LBE environment needs to be further investigated. This study employs a modified one-way fluid-solid interaction (FSI) coupling method to numerically examine flow-induced vibrations (FIV) in multi-row helical tube bundles across varying velocities, locations, helix diameters, and tube spacings. The results indicate that upstream bundles exhibit higher-frequency vorticity (100 130 Hz), while downstream bundles prevail in lower-frequency ranges (0 80 Hz). With an increase in inlet flow rate, vorticity, LBE temperature, and pressure pulsation amplitude increase, while the turbulent Prandtl (Prt) number decreases. In a close fluidsolid density ratio environment, the vibration response comprises steady deformation due to dynamic pressure and oscillations from pressure pulsations. Notably, steady deformation correlates quadratically with inlet flow rate (0 1.4 m/s), while downstream bundle oscillations are highly sensitive to flow rate variations. Larger helix diameters (760 1000 mm) positively correlate with oscillation amplitude and inversely with vibration main frequency (80 133 Hz). Bottom bundle vibration displacement exhibits a quadratic relationship with helix diameter, while middle and top bundles follow a linear trend. As longitudinal tube spacing (30 50 mm) increases, spiral bundle vibration oscillations also rise, with the middle bundle being most susceptible, followed by the lower and upper rows, and the vibration oscillations root mean square increased by factors of 1.98, 1.87, and 1.75, respectively.

关键词： Lead-bismuth eutectic Helical tube bundles fluid-structure interaction fluid-induced vibrations Additional viscous damping Nomenclature

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Well-posedness of the 3D Peskin problem

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MATHEMATICAL MODELS & METHODS IN APPLIED SCIENCES 2025年第1期35卷 113-216页

作者： Garcia-Juarez, Eduardo Kuo, Po-Chun Mori, Yoichiro Strain, Robert M. Univ Seville Dept Anal Matemat C Tarfia S-NCampus Reina Mercedes Seville 41012 Spain Univ Penn Dept Math David Rittenhouse Lab 209 South 33rd St Philadelphia PA 19104 USA

This paper introduces the 3D Peskin problem: a two-dimensional elastic membrane immersed in a three-dimensional steady Stokes flow. We obtain the equations that model this free boundary problem and show that they admit a boundary integral reduction, providing an evolution equation for the elastic interface. We consider general nonlinear elastic laws, i.e. the fully nonlinear Peskin problem, and prove that the problem is well-posed in low-regularity H & ouml;lder spaces. Moreover, we prove that the elastic membrane becomes smooth instantly in time.

关键词： Peskin problem 3D fluid-structure interaction immersed boundary problem stokes flow

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A prediction model of erosion rate under erosion-tension coupling for engine blade

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WEAR 2025年 560卷

作者： Zhang, Yu Jia, Yun-Fei Sun, Xin-Wei Fang, Zhen-Hua Yan, Jian-Jun Zhang, Cheng-Cheng Xin, Li Zhang, Xian-Cheng East China Univ Sci & Technol Sch Mech & Power Engn Key Lab Pressure Syst & Safety Minist Educ Shanghai 200237 Peoples R China AECC Commercial Aircraft Engine Co LTD Shanghai Engn Res Ctr Commercial Aircraft Engine Shanghai 201108 Peoples R China Chinese Acad Sci Inst Met Res Shi Changxu Innovat Ctr Adv Mat 62 Wencui Rd Shenyang 110016 Peoples R China

The influence of solid particle erosion on aero-engine performance poses a potential threat to aviation safety. Accurate prediction of erosion rates for blades is crucial for assessing the engine's operational lifespan. Engine blades experience centrifugal forces during operation, resulting in erosion under tensile stress. This study has designed a specialized erosion-tension coupling test apparatus to explore the effect of tensile stress on specimens subjected to gas-solid erosion. Applying an axial tensile load equivalent to 60 % of the yield strength prompts a 90.2 % increase in erosion rate for aluminum alloy specimens at a 60 degrees erosion angle. Additionally, fluid-structure interaction simulations systematically analyze the surface stress distribution of specimens under various erosion and tension conditions. Subsequently, a novel erosion model is proposed, incorporating an innovative acceleration factor that considers material yield strength, Von Mises stress distribution, and erosion crater volume. This developed model accurately predicts erosion rates under various loading conditions for cylindrical and simplified engine blade specimens, with a deviation from experimental erosion rates of less than 18.1 %. The constructed erosion model provides a concise and accurate prediction of erosion rates for specimens subjected to gas-solid erosion under tensile stress.

关键词： Erosion model Erosion-tension coupling Engine blade Erosion rate prediction fluid-structure interaction

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Investigation of the local friction behavior in the secondary shear zone by coupling of chip formation and microscale contact simulation

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INTERNATIONAL JOURNAL OF SOLIDS AND structureS 2025年 315卷

作者： Kim, Minjae Schenzel, Jan Pape, Florian Bergmann, Benjamin Denkena, Berend Poll, Gerhard Leibniz Univ Hannover Inst Machine Design & Tribol IMKT Univ 1 D-30823 Hannover Germany Leibniz Univ Hannover Inst Prod Engn & Machine Tools IFW Univ 2 D-30823 Hannover Germany

This study examines local friction behavior at the chip-tool interface in metal cutting by integrating chip formation and microscale contact simulations. This research examines the mechanical effects of high-pressure metalworking fluid (MWF) supply on chip formation, specifically its impact on frictional interactions at the tool-chip interface. Through finite element modeling and a microscale contact model, this study provides detailed insights into the effects of high-pressure MWFs on local friction coefficients, contact length, and pressure distribution in the secondary shear zone. Experimental validation using high-speed orthogonal cutting tests demonstrates strong agreement between simulated and observed results, confirming the effectiveness of the multi-scale model. The findings suggest that optimized high-pressure lubrication significantly enhances tool life, reduces process forces, and improves surface quality, making it a valuable strategy for advanced machining applications.

关键词： Orthogonal cutting Metalworking fluid Chip formation simulation Contact simulation fluid-structure interaction

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ASSESSMENT OF GROWTH AND RUPTURE OF CAROTID ATHEROSCLEROSIS AND PLAQUE WITH DIFFERENT DEGREES OF STENOSIS

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JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY 2025年第1期25卷

作者： Hu, Mengchao Jiao, Shuping Wu, Jianjin Qu, Lefeng Chen, Hongxun Daichin Shanghai Univ Shanghai Inst Appl Math & Mech Sch Mech & Engn Sci Shanghai 550001 Peoples R China Naval Med Univ Affiliated Hosp 2 Dept Vasc & Endovasc Surg Shanghai 200003 Peoples R China

In this study, the growth and rupture of plaque were investigated to predict the development of carotid atherosclerosis and plaque. Realistic 3D models of multi-component plaque and carotid artery were established in healthy, mild, moderate, and severe stenosis. fluid-structure interaction (FSI) simulations were performed on these models, and the wall shear stress (WSS), time-averaged wall shear stress (TAWSS), oscillatory shear index (OSI), relative residence time (RRT), and wall tensile stress (WTS) in a natural cardiac cycle were analyzed to assess the epidermal rupture, growth tendency, and internal rupture of plaques in a natural state. Results show that in severe stenosis, the WSS at the stenosis sites exceeds the threshold of rupture during almost the entire cardiac cycle, thus causing an epidermal injury, bringing about plaque detachment and thrombosis. TAWSS decreased and OSI and RRT increased in the bifurcation region and the downstream region of the plaque. The deposition is more likely to occur in these regions. A higher degree of stenosis will increase the OSI and RRT in the downstream region of the plaque, leading to continuous deterioration of the plaque, while the degree of stenosis has little effect on the upstream region of the plaque. The fibrous cap is the starting point for rupture within the plaque, and calcification increases the stress on the fibrous cap, thereby increasing the risk of rupture.

关键词： Atherosclerosis plaque rupture hemodynamics fluid-structure interaction biomechanics

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Exploring optimal spacing in parallel fully-passive flapping-foil hydrokinetic turbines

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JOURNAL OF fluidS AND structureS 2025年 135卷

作者： Zantoute, Siham Eddine Duarte, Leandro Dellinger, Guilhem Dellinger, Nicolas Olivier, Mathieu Dumas, Guy Ghenaim, Abdellah Terfous, Abdelali Dept Fluid Mech Lab ICUBE Strasbourg France Natl Sch Water & Environm Engn Strasbourg France Natl Inst Appl Sci Strasbourg France Laval Univ Dept Mech Engn Lab Mecan Fluides Numer Quebec City PQ Canada

The increasing global demand for sustainable energy has led to the exploration of hydrokinetic systems, particularly flapping foil turbines, which utilize fluid-structure interactions to harvest energy from water flows. This study investigates the optimization of spacing between fully passive oscillating foils arranged in parallel configuration to maximize energy extraction efficiency. Utilizing numerical simulations with OpenFOAM's overset mesh and URANS methods, the research examines the hydrodynamic performance and interaction effects of varying foil spacings, ranging from 3 to 15 chord lengths. For a specific configuration of a stall-flutter flapping foil turbine, results reveal that closer spacings (e.g., 3 chord lengths) can achieve comparable results to single-foil configurations, with solo efficiency eta = 0.299 and parallel efficiency eta = 0.304. The study further identifies a 15% increase in mean power coefficient at a spacing of d* = 5, linked to higher heave amplitude and strong fluid-structure interactions. The study highlights the potential of dual-foil setups to improve structural integrity and adaptability in diverse natural water currents. These findings offer valuable insights for the design and operation of hydrokinetic turbines, enhancing their feasibility as a sustainable energy solution.

关键词： Fully passive flapping foil Hydrokinetic turbine fluid-structure interaction Parallel foil configuration Foil spacing optimization Stall-flutter

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