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Overview of Research Progress on numerical simulation methods for Turbulent Flows Around Underwater Vehicles

Journal of Marine Science and Application 2024年第1期23卷 1-22页

作者： Kangjian He Zhi Pan Weiwen Zhao Jianhua Wang Decheng Wan Computational Marine Hydrodynamics Lab (CMHL) School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China Wuhan Second Ship Design and Research Institute Wuhan 430205 China

In this paper, we present an overview of numerical simulation methods for the flow around typical underwater vehicles at high Reynolds numbers, which highlights the dominant flow structures in different regions of interest. This overview covers the forebody, midbody, stern, wake region, and appendages and summarizes flow phenomena, including laminar-to-turbulent transition, turbulent boundary layers, flow under the influence of curvatures, wake interactions, and all associated complex vortex structures. Furthermore, the current issues and challenges of capturing these flow structures are addressed. This overview provides a deep insight into the use of numerical simulation methods, including the Reynolds-averaged Navier–Stokes (RANS) method, large eddy simulation (LES) method, and the hybrid RANS/LES method, and evaluates their applicability in capturing detailed flow features.

关键词： numerical simulation methods Underwater vehicles Boundary layer transition Turbulent boundary layer Wake Appendages

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水下航行体湍流数值模拟方法研究进展综述

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哈尔滨工程大学学报（英文版） 2024年第1期23卷 1-22页

作者：和康健潘治赵伟文王建华万德成 Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Wuhan Second Ship Design and Research Institute Wuhan 430205China

In this paper,we present an overview of numerical simulation methods for the flow around typical underwater vehicles at high Reynolds numbers,which highlights the dominant flow structures in different regions of *** overview covers the forebody,midbody,stern,wake region,and appendages and summarizes flow phenomena,including laminar-to-turbulent transition,turbulent boundary layers,flow under the influence of curvatures,wake interactions,and all associated complex vortex ***,the current issues and challenges of capturing these flow structures are *** overview provides a deep insight into the use of numerical simulation methods,including the Reynolds-averaged Navier–Stokes(RANS)method,large eddy simulation(LES)method,and the hybrid RANS/LES method,and evaluates their applicability in capturing detailed flow features.

关键词： numerical simulation methods Underwater vehicles Boundary layer transition Turbulent boundary layer Wake Appendages

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Modeling and performance analysis of phase change materials in advanced thermal energy storage systems: A comprehensive review

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JOURNAL OF ENERGY STORAGE 2025年 121卷

作者： Abdellatif, Houssam Eddine Belaadi, Ahmed Arshad, Adeel Bourchak, Mostefa Univ 20 Aout 1955 Fac Technol Dept Genie Mecan Skikda Algeria Aston Univ Coll Engn & Phys Sci Dept Mechatron & Biomed Engn Birmingham B4 7ET England King Abdulaziz Univ Aerosp Engn Dept Jeddah Saudi Arabia

Phase change materials (PCMs) are crucial for efficient energy storage, yet their inherent challenges include low thermal conductivity, limited latent heat capacity, and potential leakage. This review comprehensively examines advanced thermal energy storage (TES), focusing on latent and hybrid systems. Innovative methods to enhance PCM performance are explored, such as incorporating fins, nanoparticles, porous matrices, multiple PCMs, encapsulation, and stabilization techniques. Various numerical simulation methods (Enthalpy, Heat Capacity, Finite Difference, etc.) are detailed for precise modeling of thermal storage systems. The study investigates diverse composite PCMs (NePCM, hybrid, encapsulated, porous), supported by tables summarizing studies on shell-and-tube heat exchanger modifications, hybrid tank investigations, and fin geometries. By critically analyzing recent advancements, this review provides new insights into the effectiveness of enhancement techniques and the role of numerical modeling in optimizing TES performance. Unlike previous reviews, this work integrates a comparative evaluation of hybrid TES systems, highlighting their advantages over conventional latent and sensible storage methods. Additionally, it bridges the gap between experimental studies and numerical modeling, providing engineers with practical guidelines for optimizing PCM-based TES designs. This synthesis of data is essential for researchers and engineers in sustainable energy systems. Emphasizing PCM's pivotal role in energy efficiency, the study underscores the urgent need for innovative solutions. Future research should focus on enhancing thermal conductivity, minimizing leakage, and improving long-term stability to maximize the practicality and efficiency of PCM-based TES systems.

关键词： Phase change materials (PCMs) Thermal energy storage (TES) technologies numerical simulation methods PCMs performance enhancement methods Sustainable energy systems Nanoparticles in PCMs Porous matrices Encapsulation techniques Shape stabilization

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Shape-Programming in Hyperelasticity Through Differential Growth

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APPLIED MATHEMATICS AND OPTIMIZATION 2024年第2期89卷 49-49页

作者： Ortigosa-Martinez, Rogelio Martinez-Frutos, Jesus Mora-Corral, Carlos Pedregal, Pablo Periago, Francisco Tech Univ Cartagena Dept Appl Math & Stat Campus Muralla Mar Cartagena 30202 Murcia Spain Tech Univ Cartagena Multiphys Simulat & Optimizat Lab Campus Muralla Mar Cartagena 30202 Murcia Spain Univ Autonoma Madrid Dept Math Madrid 28049 Spain Inst Ciencias Matemat CSIC UAM UC3M UCM Madrid 28049 Spain Univ Castilla La Mancha Dept Math INEI Camilo Jose Cela2 Ciudad Real 13071 Castilla La Man Spain

This paper is concerned with the growth-driven shape-programming problem, which involves determining a growth tensor that can produce a deformation on a hyperelastic body reaching a given target shape. We consider the two cases of globally compatible growth, where the growth tensor is a deformation gradient over the undeformed domain, and the incompatible one, which discards such hypothesis. We formulate the problem within the framework of optimal control theory in hyperelasticity. The Hausdorff distance is used to quantify dissimilarities between shapes;the complexity of the actuation is incorporated in the cost functional as well. Boundary conditions and external loads are allowed in the state law, thus extending previous works where the stress-free hypothesis turns out to be essential. A rigorous mathematical analysis is then carried out to prove the well-posedness of the problem. The numerical approximation is performed using gradient-based optimisation algorithms. Our main goal in this part is to show the possibility to apply inverse techniques for the numerical approximation of this problem, which allows us to address more generic situations than those covered by analytical approaches. Several numerical experiments for beam-like and shell-type geometries illustrate the performance of the proposed numerical scheme.

关键词： Soft robotics Differential growth Hyperelasticity Shape-programming Optimal control numerical simulation methods

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Mathematical modeling, analysis and control in soft robotics: a survey

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SeMA Journal 2024年第1期81卷 147-164页

作者： Ortigosa-Martínez, Rogelio Martínez-Frutos, Jesús Mora-Corral, Carlos Pedregal, Pablo Periago, Francisco Department of Applied Mathematics and Statistics Technical University of Cartagena Campus Muralla del Mar Murcia Cartagena 30202 Spain Multiphysics Simulation and Optimization Group Technical University of Cartagena Campus Muralla del Mar Murcia Cartagena 30202 Spain Departamento de Matemáticas Universidad Aautónoma de Madrid and Instituto de Ciencias Matemáticas CSIC-UAM-UC3M-UCM Francisco Tomás y Valiente 7 Madrid 28049 Spain Department of Mathematics INEI University of Castilla-La Mancha Camilo José Cela 2 Castilla-La Mancha Ciudad Real 13071 Spain

This paper reviews some recent advances in mathematical modeling, analysis and control, both from the theoretical and numerical viewpoints, in the emergent field of soft robotics. The presentation is not focused on specific prototypes of soft robots, but in a more general description of soft smart materials. The goal is to provide a unified and rigorous mathematical approach to open-loop control strategies for soft materials that hopefully might lay the seeds for future research in this field. © 2023, The Author(s).

关键词： 49J45 65K10 74B20 93A30 Hyperelasticity numerical simulation methods Optimal control Smart materials Soft robotics

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A Comprehensive Review of Assessing Storm Surge Disasters: From Traditional Statistical methods to Artificial Intelligence-Based Techniques

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ATMOSPHERE 2024年第3期15卷 359页

作者： Zhang, Yuxuan Zhang, Tianyu Guangdong Ocean Univ Coll Ocean & Meteorol Zhanjiang 524088 Peoples R China Guangdong Ocean Univ Coll Ocean & Meteorol Lab Coastal Ocean Variat & Disaster Predict Zhanjiang 524088 Peoples R China Guangdong Ocean Univ Dept Educ Guangdong Prov Key Lab Climate Resources & Environm Continental S Zhanjiang 524088 Peoples R China

In the context of global climate change and rising sea levels, the adverse impacts of storm surges on the environment, economy, and society of affected areas are becoming increasingly significant. However, due to differences in geography, climate, and other conditions among the affected areas, a single method for assessing the risk of storm surge disasters cannot be fully applicable to all regions. To address this issue, an increasing number of new methods and models are being applied in the field of storm surge disaster risk assessment. This paper introduces representative traditional statistical methods, numerical simulation methods, and artificial intelligence-based techniques in this field. It compares these assessment methods in terms of accuracy, interpretability, and implementation difficulty. The paper emphasizes the importance of selecting appropriate assessment methods based on specific conditions and scientifically combining various methods in practice to improve the accuracy and reliability of storm surge disaster risk assessments.

关键词： storm surge disaster risks and economic losses traditional statistical methods numerical simulation methods artificial intelligence-based techniques

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Research on wind pressure characteristics of traditional timber buildings: a case study of the main hall of Shisi Temple

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JOURNAL OF WOOD SCIENCE 2024年第1期70卷 12页

作者： Gao, Xiaoyue Chun, Qing Han, Yidan Southeast Univ Sch Architecture Nanjing Peoples R China

Traditional timber buildings are sensitive to wind action. Studying the wind pressure characteristics is the premise for the preventive conservation of traditional timber buildings. To investigate the computational fluid dynamics (CFD) numerical simulation method for wind pressure on traditional timber buildings, a typical traditional timber building, the main hall of Shisi Temple, is chosen as a case to carry out the study. A comparative analysis is conducted to examine the effects of curve simplification of the roof slope, as well as the Dougong (bracket sets) and roof tile components, on the numerical simulation results of wind pressure on the building surface. Additionally, simplification schemes of geometric modeling are provided for the efficient and accurate simulation. The results indicate that moderate simplification of the roof curve has a relatively minor impact on the overall calculation of wind pressure, and the difference between the drag coefficients of the simplified model and the accurate model is no more than 3%. However, excessive simplification can lead to distorted simulation results, and a three-segment curve simplification method is recommended for roof cornices. The influence of Dougong on the wind pressure calculation results is negligible (within 5%), whereas roof tiles significantly reduce the drag coefficient, with an impact of over 30% at various wind directions. The impact of roof tiles on wind pressure distribution in traditional timber buildings lies in their alteration of the building aerodynamic shape rather than an increase in roof thickness. The findings can provide a basis for assessing the wind resistance of traditional timber buildings and helpful insights for improving the efficiency of wind pressure analyses of traditional timber structures.

关键词： Traditional timber buildings Wind pressure CFD numerical simulation methods

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Study on the Mechanical Properties and Design Method of Frame-Unit Bamboo Culm Members Based on Semi-Rigid Joints

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BUILDINGS 2024年第4期14卷 991页

作者： Wang, Guojin Zhuo, Xin Zhang, Shenbin Wu, Jie Zhejiang Univ Ctr Balance Architecture Hangzhou 310028 Peoples R China Zhejiang Univ Dept Civil Engn Hangzhou 310058 Peoples R China Zhejiang Univ Co Ltd Architectural Design & Res Inst Hangzhou 310028 Peoples R China

The frame-unit bamboo culm structure system offers a novel approach to bamboo structure, combining advantages like reduced construction times and simplified joint designs. Despite its benefits, there is limited research on its mechanical properties and computational methodologies. This study conducted bending performance tests on simply supported frame-unit bamboo culm structures, revealing that the bending stiffness of the structure increases with the number of bolts in the edge joints, though with diminishing efficiency. Based on the experimental observations, a calculation model for this type of structure was established, proposing formulas to describe the stiffness relationships between the corner joints, edge joint, and the overall structure. numerical simulations calculated the stiffness of the edge joint as a function of the number and placement of bolts, indicating that positioning bolts closer to the outer side enhances edge joint stiffness. By inputting the various rotational stiffness values of corner joints into the simulations and stiffness formulas, consistent total stiffness values were obtained, validating the proposed stiffness relationship formulas. The average stiffness values of the corner joints were derived from these formulas and experimental data, and the rotational stiffness of other types of corner points can also be obtained using this method. Furthermore, a finite element computational method tailored for this structural system was introduced, converting the actual structure into a beam element model for calculation. The equivalent joint forces can be distributed to various components of the actual structure, resulting in the internal force distribution of bamboo culms and bolts in the actual structure, thus achieving the design of the components. The calculated displacement values obtained from this method are close to the displacement values in the experiment, proving the feasibility of this method.

关键词： frame-unit prefabricated bamboo culm structure semi-rigid joint mechanical property numerical simulation methods design method

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Comparison Between Different Finite Element Analyses of Unbonded Flexible Pipe via Different Modeling Patterns

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Journal of Shanghai Jiaotong university(Science) 2019年第3期24卷 357-363页

作者： PANG Guoliang CHEN Chaohe SHEN Yijun LIU Fuyong Naval Architecture and Ocean Engineering R&D Center of Guangdong Province South China University of Technology

Three kinds of models based on the same flexible pipe with 8 layers have been separately created to investigate the effects of different modeling approaches on numerical simulation results of finite element(FE)models for unbonded flexible *** the mechanical property of the unbonded flexible pipe under tension,torsion and bending load has been analyzed and compared via ABAQUS software on the basis of three created *** research shows that different modeling methods of flexible pipes make a great difference in the ***,modeling simplifications of the carcass and pressure armor have a great impact on the accuracy of the *** 3,in which the carcass is simulated by spiral isot ropic shell and other layers are Simula ted by solid element,possesses good adaptability,which has been proved by comparing the experiment data and other *** paper can offer a reference for the FE modeling methods,selection and mechanical property analysis of unbonded flexible pipe.

关键词： unbonded flexible pipe numerical simulation methods finite element(FE) analysis

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Power Semiconductor Converter Optimization of Electric Drive 17

Power Semiconductor Converter Optimization of Electric Drive

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17th International Ural Conference on Alternating Current Electric Drives (ACED)

作者： Tsirkunenko, Anatoly T. Gryzlov, Artyom A. Bukhanov, Sergey S. RiK Energo Lld Ekaterinburg Russia

ISBN: (纸本)9781538624227

This paper presents the optimization of power circuits of multiphase semiconductor converters which powered synchronous reluctance electric drives. In the general case, currents leak through power circuits which form is different from a sinusoidal one. By way of the optimization criterion of main-circuit connections, the condition was assumed to provide the maximum torque created by the electric drive. The second stage presents an algorithm for numerical optimization of the phase current form in multiphase synchronous reluctance electric drives. The dependence of the pulsations of the electromagnetic torque as a function of the number of phases in an electric machine is obtained. It is established that an increase in the number of phases greater than 6 does not significantly reduce the pulsations of the electromagnetic torque. A further increase in the number of phases leads to an increase in the cost of the semiconductor converter.

关键词： semiconductor converter electric losses multiphase circuit numerical simulation methods

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