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Interface behavior of steel-slag-air during tundish filling process:physical modeling and mathematical simulation 认领 引用
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作者 Yu-Hang Wang Hai-Yan Tang +3 位作者 Kai-Min Wang Zhen-Dong Wang Xing-Yu Jia Jia-Quan Zhang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第3期266-282,共17页
In view of the frequent deterioration of molten steel quality during the tundish filling process,the slag-steel-air interface behavior in a tundish,including liquid level fluctuation,slag eyes,slag entrapment and air ... In view of the frequent deterioration of molten steel quality during the tundish filling process,the slag-steel-air interface behavior in a tundish,including liquid level fluctuation,slag eyes,slag entrapment and air suction during the steady-state casting and filling process,was comparatively studied through physical modeling and mathematical simulation methods.During the filling process,the liquid surface forms a large-size slag eye under the impact of molten steel from a ladle shroud,which simultaneously results in a violent fluctuation of liquid level.Concurrently,the liquid flow entrains the air phase and the cover slag into the tundish impact zone,resulting in slag entrapment and air suction.At filling flow rates of 1.5Q,2.0Q,and 2.5Q(Q is the flow rate under steady-state casting),the amount of slag entrapped is 8.39×10-5,9.65×10-5,and 12.7×10-5m3,respectively,while the volume of air aspirated is 0.84×10-4,1.47×10-4,and 2.01×10-4m3,indicating that slag entrapment and air suction intensify with an increase in tundish filling flow rate.Flow field characterization identifies eddy currents in the impact zone as the primary driver of the above phenomena.Proper filling process parameters were proposed to improve the steel quality during the tundish filling. 展开更多
关键词 Mathematical simulation Physical modeling Tundish filling process Interface behavior Steel-slag-air interface
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Confinement effect on phase behavior and critical properties of pure/mixed n-alkanes in shale quartz nanopores:Insights from Gauge-Gibbs ensemble Monte Carlo simulation 认领 引用
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作者 Yifan Li Jun Yao +2 位作者 Hai Sun Yongfei Yang Junjie Zhong 《Theoretical & Applied Mechanics Letters》 EI CAS CSCD 2026年第3期99-109,共11页
Shale formations contain many pores 2-50 nm in size.These pores can make up more than 20%of the total pore volume.In such small pores,interactions between the pore walls and fluids cannot be ignored.This leads to sign... Shale formations contain many pores 2-50 nm in size.These pores can make up more than 20%of the total pore volume.In such small pores,interactions between the pore walls and fluids cannot be ignored.This leads to significant confinement effects on the fluids.Alkanes are the main components of shale oil and gas.Their thermodynamic properties are key to understanding the distribution,efficient extraction,and industrial application of shale reserves.In this study,we used molecular simulations to study the phase behavior of methane,n-dodecane and n-eicosane in shale nanopores.We compared how chain length affects their phase behavior.First,we optimized the critical exponent values to improve the calculation accuracy of the critical parameters.To quantitatively evaluate confinement effects,we investigated the vapor-liquid equilibrium and critical properties of n-alkanes in nanopores with different pore sizes and geometries.The results show that in water-wet hydroxylated silica pores,the shifts in confined critical properties of n-alkanes do not exhibit a clear carbon chain length dependence.Based on the simulation results,we established predictive models for the critical properties of pure fluid.Finally,using a multicomponent shale oil reservoir as an example,we explored the influence of confinement effects on phase diagrams and the evolution of fluid component distribution during the pressure depletion process. 展开更多
关键词 Phase behavior Shale oil reservoirs Confinement effect Molecular simulation
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Numerical Simulation of Cross-Layer Propagation Mechanisms for Hydraulic Fractures in Deep Coal-Rock Formations 认领 引用
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作者 Zhirong Jin Xiaorui Hou +4 位作者 Yanrong Ge Tiankui Guo Ming Chen Shuyi Li Tianyu Niu 《Energy Engineering》 EI 2026年第2期369-391,共23页
Hydraulic fracturing serves as a critical technology for reservoir stimulation in deep coalbed methane(CBM)development,where the mechanical properties of gangue layers exert a significant control on fracture propagati... Hydraulic fracturing serves as a critical technology for reservoir stimulation in deep coalbed methane(CBM)development,where the mechanical properties of gangue layers exert a significant control on fracture propagation behavior.To address the unclear mechanisms governing fracture penetration across coal-gangue interfaces,this study employs the Continuum-Discontinuum Element Method(CDEM)to simulate and analyze the vertical propagation of hydraulic fractures initiating within coal seams,based on geomechanical parameters derived from the deep Benxi Formation coal seams in the southeastern Ordos Basin.The investigation systematically examines the influence of geological and operational parameters on cross-interfacial fracture growth.Results demonstrate that vertical stress difference,elastic modulus contrast between coal and gangue layers,interfacial stress differential,and interfacial cohesion at coal-gangue interfaces are critical factors governing hydraulic fracture penetration through these interfaces.High vertical stress differences(>3 MPa)inhibit interfacial dilation,promoting predominant crosslayer fracture propagation.Reduced interfacial stress contrasts and enhanced interfacial cohesion facilitate fracture penetration across interfaces.Furthermore,smaller elastic modulus contrasts between coal and gangue correlate with increased interfacial aperture.Finally,lower injection rates effectively suppress vertical fracture propagation in deep coal reservoirs.This study elucidates the characteristics and mechanisms governing cross-layer fracture propagation in coal–rock composites with interbedded partings,and delineates the dynamic evolution laws and dominant controlling factors involved.Thefindings provide critical theoretical insights for the optimization of fracture design and the efficient development of deep coalbed methane reservoirs. 展开更多
关键词 Deep coal-rock formations cross-layer fracturing fluid-solid coupling fracture propagation behavior numerical simulation
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Plastic flow and interfacial bonding behaviors of embedded linear friction welding process:Numerical simulation combined with thermophysical experiment 认领 引用 被引量：1
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作者 Tiejun MA Zhenguo GUO +6 位作者 Xiawei YANG Junlong JIN Xi CHEN Jun TAO Wenya LI Achilles VAIRIS Liukuan YU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第1期87-98,共12页
In this study,a new linear friction welding(LFW)process,embedded LFW process,was put forward,which was mainly applied to combination manufacturing of long or overlong loadcarrying titanium alloy structural components ... In this study,a new linear friction welding(LFW)process,embedded LFW process,was put forward,which was mainly applied to combination manufacturing of long or overlong loadcarrying titanium alloy structural components in aircraft.The interfacial plastic flow behavior and bonding mechanism of this process were investigated by a developed coupling EulerianLagrangian numerical model using software ABAQUS and a novel thermo-physical simulation method with designed embedded hot compression specimen.In addition,the formation mechanism and control method of welding defects caused by uneven plastic flow were discussed.The results reveal that the plastic flow along oscillating direction of this process is even and sufficient.In the direction perpendicular to oscillation,thermo-plastic metals mainly flow downward along welding interface under coupling of shear stress and interfacial pressure,resulting in the interfacial plastic zone shown as an inverted“V”shape.The upward plastic flow in this direction is relatively weak,and only a small amount of flash is extruded from top of joint.Moreover,the wedge block and welding components at top of joint are always in un-steady friction stage,leading to nonuniform temperature field distribution and un-welded defects.According to the results of numerical simulation,high oscillating frequency combined with low pressure and small amplitude is considered as appropriate parameter selection scheme to improve the upward interfacial plastic flow at top of joint and suppress the un-welded defects.The results of thermo-physical simulation illustrate that continuous dynamic recrystallization(CDRX)induces the bonding of interface,accompanying by intense dislocation movement and creation of many low-angle grain boundaries.In the interfacial bonding area,grain orientation is random with relatively low texture density(5.0 mud)owing to CDRX. 展开更多
关键词 Embedded linear friction welding Plastic flow Interfacial bonding behavior Numerical simulation Thermo-physical simulation Temperature field Dynamic recrystallization
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Guest Editorial for the Special Issue on Advanced Computational Modeling and Simulations for Engineering Structures and Multifunctional Materials:Bridging Theory and Practice 认领 引用
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作者 S.M.Anas Rayeh Nasr Al-Dala’ien 《Computers, Materials & Continua》 SCIE EI 2026年第7期2268-2273,共6页
1 Introduction The growing use of computational modelling, simulation tools, and data-driven methods has changedhe way engineering structures and advanced materials are studied and designed. With the increasing availa... 1 Introduction The growing use of computational modelling, simulation tools, and data-driven methods has changedhe way engineering structures and advanced materials are studied and designed. With the increasing availability of high-performance computing, artificial intelligence, and multi-scale simulation techniques,computational modelling is no longer limited to purely theoretical studies. It has now emerged as a practical design aid, allowing researchers to predict material behavior, understand complex interactions, and support engineering decisions across different material and structural scales. These developments have helped in narrowing the gap between theoretical studies and practical engineering applications. 展开更多
关键词 engineering structures practical design aid advanced materials understand complex inte computational modelling simulation tools predict material behavior artificial intelligence
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Atomistic simulations of dislocation behaviors in Cr-Mn-Fe-Co-Ni high-entropy alloys with different Cr/Ni ratio 认领 引用
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作者 Yu Tian Fei Chen 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第17期30-42,共13页
Pronounced compositional fluctuations in CrMnFeCoNi high-entropy alloys(HEAs)lead to variations of the stacking-fault energy(SFE),which dominates the dislocation behavior and mechanical properties.However,studies on t... Pronounced compositional fluctuations in CrMnFeCoNi high-entropy alloys(HEAs)lead to variations of the stacking-fault energy(SFE),which dominates the dislocation behavior and mechanical properties.However,studies on the underlying dislocation behaviors and deformation mechanisms as a function of composition(Cr/Ni ratio)within CrMnFeCoNi HEAs are largely lacking,which hinders further understanding of the composition-structure-property relationships for the rational design of HEAs.Atomistic simulations were employed in this study to investigate the core structures and dynamic behaviors of a/2edge dislocations in non-equiatomic CrMnFeCoNi HEA,as well as its plasticity mechanisms.The results show that the core structure of a/2edge dislocations is planar after energy minimization,but with significant variations in the separation distance between two partial dislocations along the dislocation line owing to the complex local composition.The effects of the Cr/Ni ratio on the dislocation-solute interactions during dislocation gliding were calculated and discussed.Additionally,snapshots of dislocation motion under shear stress were analyzed.The observations indicate that the strengthening of the non-equiatomic CrMnFeCoNi HEA with increasing Cr concentration is not contributed by the expected solute/dislocation interactions,but the observed events of edge extended dislocation climbing through jog nucleation.The unusual but reasonable dislocation climbing phenomenon and the resultant strengthening observed in this study open extraordinary opportunities for obtaining outstanding mechanical properties in non-equiatomic CrMnFeCoNi HEAs by tailoring the compositional variations. 展开更多
关键词 High-entropy alloy Atomistic simulations Dislocation behaviors Strengthening mechanism
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Simulation of Passenger Behavior in Virtual Subway Station Based on Multi-Agent 认领 引用
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作者 Yan Li Zequn Li +4 位作者 Fengting Yan Yu Wei Linghong Kong Zhicai Shi Lei Qiao 《国际计算机前沿大会会议论文集》 EI 2020年第2期393-408,共16页
According to architectural structure of underground station and condition of passengers,the emergency evacuations are extremely important during emergency accidents caused in the stations.Based on the architectural fe... According to architectural structure of underground station and condition of passengers,the emergency evacuations are extremely important during emergency accidents caused in the stations.Based on the architectural features and situation of passengers in the station,Multi-Agent system is proposed to analyze passengers’behavior and elements which affect passengers’behavior.Base on the crowd mentality,the model of selective behavior of passengers’route was established to simulate passengers’actions during emergency accidents.It is feasible to find out the influence brought by crowd mentality affect the emergency evacuations,and the influence of remitting the situation from external factor through WebVR.At last,it provides references for emergency evacuation strategy. 展开更多
关键词 Underground station Emergency accidents Passengers’behavior Multi-Agent
Multiscale Numerical Simulation of Dynamic Damage and Fracture in Metallic Materials: A Review 认领 引用
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作者 Bin Gao Xinyu Jiang +5 位作者 Lusheng Wang Jun Ding Yanhong Peng Xin Yang Hongzhou Yan Shaojie Gu 《Computers, Materials & Continua》 SCIE EI 2026年第6期1-29,共29页
This paper provides a comprehensive review of recent advances in multi-scale modeling for simulating dynamic damage and fracture in metallic materials,a critical area due to the widespread application of metals and th... This paper provides a comprehensive review of recent advances in multi-scale modeling for simulating dynamic damage and fracture in metallic materials,a critical area due to the widespread application of metals and their susceptibility to complex failure in engineering practice.The paper first outlines the mechanisms of damage evolution and crack propagation across different spatial and temporal scales.It then introduces commonly used simulation approaches spanning micro-to macro-scales for studying damage and fracture in metals,analyzing the evolution of mechanical properties from defect initiation to ultimate failure,and elucidating the underlying damage mechanisms at different scales.Finally,the review summarizes multi-scale coupling strategies and mechanisms,as well as the integration of machine learning(ML)into multi-scale frameworks.These advanced approaches are recognized as key tools for improving predictive accuracy and computational efficiency,facilitating the scalability of multi-scale damage modeling for metallic materials in large-scale engineering applications and digital twin platforms.This review aims to provide a theoretical foundation for future research toward more reliable,efficient,and predictive multi-scale modeling of metallic materials. 展开更多
关键词 Multiscale simulation metallic materials mechanical behavior damage evolution fracture
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Multi-agent Based Hierarchy Simulation Models of Carrier-based Aircraft Catapult Launch 认领 引用 被引量：29
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作者 王维军 屈香菊 郭林亮 《Chinese Journal of Aeronautics》 SCIE EI CAS 2008年第3期223-231,共9页
With the aid of multi-agent based modeling approach to complex systems, the hierarchy simulation models of carrier-based aircraft catapult launch are developed. Ocean, carrier, aircraft, and atmosphere are treated as ... With the aid of multi-agent based modeling approach to complex systems, the hierarchy simulation models of carrier-based aircraft catapult launch are developed. Ocean, carrier, aircraft, and atmosphere are treated as aggregation agents, the detailed components like catapult, landing gears, and disturbances are considered as meta-agents, which belong to their aggregation agent. Thus, the model with two layers is formed i.e. the aggregation agent layer and the meta-agent layer. The information communication among all agents is described. The meta-agents within one aggregation agent communicate with each other directly by information sharing, but the meta-agents, which belong to different aggregation agents exchange their information through the aggregation layer first, and then perceive it from the sharing environment, that is the aggregation agent. Thus, not only the hierarchy model is built, but also the environment perceived by each agent is specified. Meanwhile, the problem of balancing the independency of agent and the resource consumption brought by real-time communication within multi-agent system （MAS） is resolved. Each agent involved in carrier-based aircraft catapult launch is depicted, with considering the interaction within disturbed atmospheric environment and multiple motion bodies including carrier, aircraft, and landing gears. The models of reactive agents among them are derived based on tensors, and the perceived messages and inner frameworks of each agent are characterized. Finally, some results of a simulation instance are given. The simulation and modeling of dynamic system based on multi-agent system is of benefit to express physical concepts and logical hierarchy clearly and precisely. The system model can easily draw in kinds of other agents to achieve a precise simulation of more complex system. This modeling technique makes the complex integral dynamic equations of multibodies decompose into parallel operations of single agent, and it is convenient to expand, maintain, and reuse the program codes. 展开更多
关键词 multi-agent system （MAS） multi-agent based modeling （MABM） tensor carrier-based aircraft catapult launch hierarchy simulation model
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A Fundamental Study on Multi-agent Pedestrian Model Based on Risk Avoidance Behavior during Road Blockage and Evacuation Simulation of Regional Urban Disaster 认领 引用
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作者 Hideaki Takayanagi Tatsuto Kihara +5 位作者 Yosuke Kurita Kazuhide Kawaguchi Hidetoshi Kawaguchi Takaaki Furukawa Takuhi Ono Shogo Yamada 《Journal of Civil Engineering and Architecture》 2019年第4期219-237,共19页
Regional cities in Japan are at the risk of experiencing big fire accidents or earthquakes every day.However,neither the number nor the capacity of shelters has increased because local governments might not consider t... Regional cities in Japan are at the risk of experiencing big fire accidents or earthquakes every day.However,neither the number nor the capacity of shelters has increased because local governments might not consider them owing to budget shortfall.By contrast,wide-area evacuation simulations can easily provide an antagonizing image of regional urban disasters.After a disaster,the city collapses and the evacuation routes are closed;consequently,evacuees feel anxious and they cannot move as usual.This anxiety behavior has not been considered in previous related studies and simulations.In this study,a wide-area evacuation simulation is developed;this model can not only calculate the possibility of blocking escape routes when the city is broken but also provide safe and more realistic evacuation plans before a disaster occurs by incorporating into the simulation the risk avoidance behaviors of evacuees from road blockage,such as“the route re-seeking behavior”and“the shelter re-selecting behavior”. 展开更多
关键词 Wide-area evacuation simulation multi-agent model risk avoidance behavior regional disaster prevention plan
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Evaluation of Behavior of Evacuees on a Floor in a Disaster Situation Using Multi-agent Simulation and Mixed Reality Game: Effectiveness of the Field of Vision and Priority of Referred Objects 认领 引用
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作者 Keita Sugiura Masahiro Arakawa 《Computer Technology and Application》 2016年第5期227-235,共9页
In this study, we develop a mixed reality game system to investigate characteristics ofjudgrnents of individual players in an evacuation process. The characteristics of judgments of the players that are inferred from ... In this study, we develop a mixed reality game system to investigate characteristics ofjudgrnents of individual players in an evacuation process. The characteristics of judgments of the players that are inferred from the performance of the game are then incorporated into a multi-agent simulation as rules. The behavior of evacuees is evaluated in approximations of real situations, by using the agent simulation including different judgments of evacuees. Using the results of the simulation, effective methods are discussed for achieving the escape of the evacuees within a short time. 展开更多
关键词 Multi-agent simulation mixed reality game system emergency exit sign behavior of evacuees field of vision.
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Assessing the Carrying Capacity of Tourist Resorts:An Application of Tourists’Spatial Behavior Simulator Based on GIS and Multi-Agent System 认领 引用 被引量：2
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作者 ZHANG Ren-jun 《Wuhan University Journal of Natural Sciences》 EI CAS 2005年第4期779-784,共6页
Based on the study of visitors'individual spatial behaviors,a tourists'spatial behavior simulator(TSBS)to assess the carrying capacity of tourist resorts was developed,TSBS employs GIS(Geographic Information S... Based on the study of visitors'individual spatial behaviors,a tourists'spatial behavior simulator(TSBS)to assess the carrying capacity of tourist resorts was developed,TSBS employs GIS(Geographic Information System)to manage the spatial data,and Multi-Agent systemto simulate the actions of individual visitors.By utilizing TSBS,visitors'travel patterns such aslocation,cost,and state can be analyzed and predicted.Based on this analysis and prediction,themodel of assessing the carrying capacity of resorts is built.Our results show that TSBS will be aneffective tool to accurately assess the carrying capacity of tourist resorts. 展开更多
关键词 tourist resort carrying capacity TSBS GIS Multi-Agent simulator
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Elastic-plastic behavior of nickel-based single crystal superalloys with γ-γ′phases based on molecular dynamics simulations 认领 引用
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作者 Jing-Zhao Cao Yun-Guang Zhang +3 位作者 Zhong-Kui Zhang Jiang-Peng Fan Qi Dong Ying-Ying Fang 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第4期510-521,共12页
The effects of temperature and Re content on the mechanical properties,dislocation morphology,and deformation mechanism of γ-γ′phases nickel-based single crystal superalloys are investigated by using the molecular ... The effects of temperature and Re content on the mechanical properties,dislocation morphology,and deformation mechanism of γ-γ′phases nickel-based single crystal superalloys are investigated by using the molecular dynamics method through the model of γ-γ′phases containing hole defect.The addition of Re makes the dislocation distribution tend towards the γ phase.The higher the Re content,the earlier theγphase yields,while the γ′phase yields later.Dislocation bends under the combined action of the applied force and the resistance of the Re atoms to form a bend point.The Re atoms are located at the bend points and strengthen the alloy by fixing the dislocation and preventing it from cutting the γ′phase.Dislocations nucleate first in the γ phase,causing theγphase to deform plastically before the γ′phase.As the strain increases,the dislocation length first remains unchanged,then increases rapidly,and finally fluctuates and changes.The dislocation lengths in the γ phase are larger than those in the γ′phase at different temperatures.The dislocation length shows a decreasing tendency with the increase of the temperature.Temperature can affect movement of the dislocation,and superalloys have different plastic deformation mechanisms at low,medium and high temperatures. 展开更多
关键词 nickel-based single crystal superalloys elastic-plastic behavior dislocations molecular dynamics simulation
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Evaluation of the Behavior of Evacuees on Dynamic Floor Condition by Using Multi-agent Simulation 认领 引用
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作者 Keita Sugiura Masahiro Arakawa Naoto Yokoi 《Journal of Electrical Engineering》 2017年第6期275-287,共13页
The prediction of the behavior of people in a disaster has a useful role to play in the design of urban structures such as department stores, schools, and office buildings. We focus on using emergency exit signs to ef... The prediction of the behavior of people in a disaster has a useful role to play in the design of urban structures such as department stores, schools, and office buildings. We focus on using emergency exit signs to effectively guide the evacuation of people on a floor with a dynamically changing layout. A multi-agent simulation is developed to simulate the behavior of evacuees on a floor. A mathematical model is constructed to obtain optimal sign locations to efficiently assist evacuation under the condition that obstacles are dynamically generated on the floor. The optimal sign locations are calculated by the mathematical model. Then, the developed simulation is performed to evaluate the effectiveness of the emergency exit signs and the behavior of evacuees on simple layout models using the calculated optimal sign locations. 展开更多
关键词 Multi-agent simulation emergency exit sign system dynamically changing floor layout mathematical model optimal location of exit sign.
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Comparison of partially averaged Navier-Stokes and large eddy simulation of the aerodynamic behaviors of a generic high-speed train 认领 引用
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作者 DONG Tian-yun MINELLI Guglielmo +2 位作者 WANG Jia-bin BASARA Branislav KRAJNOVIĆ Sinisa 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第12期4736-4754,共19页
This paper investigates the influence of numerical methods and mesh resolution on the prediction accuracy of the aerodynamic behaviors of a 1/20 scaled generic high-speed train(HST)model.A thorough comparison is made ... This paper investigates the influence of numerical methods and mesh resolution on the prediction accuracy of the aerodynamic behaviors of a 1/20 scaled generic high-speed train(HST)model.A thorough comparison is made between partially averaged Navier-Stokes(PANS),large eddy simulation(LES),and wind tunnel experiments,covering aerodynamic forces,surface pressure,velocity distribution,and Reynolds stress and turbulent kinetic energy in the wake region.The Reynolds number for both simulations and experiments is set to 4.75×105.The results show that the PANS approach accurately predicts flow characteristics observed in experiments and fine LES calculations,even with a low resolution grid.PANS exhibits a distinct advantage over LES when grid resolutions are insufficient for resolving near wall flow structures around the HST,both in open-air conditions and crosswind environments.Additionally,grid refinement improves the predictive accuracy of the HST's aerodynamic performance,particularly in the presence of small yaw angle. 展开更多
关键词 partially averaged Navier-Stokes(PANS) large eddy simulation(LES) wind tunnel experiments generic high-speed train model aerodynamic behaviors
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Discrete decision model and multi-agent simulation of the Liang Zong two-chain hierarchical organization in a complex project 认领 引用
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作者 MAI Qiang ZHAO Yueqiang AN Shi 《Journal of Systems Engineering and Electronics》 SCIE CSCD 2018年第2期311-320,共10页
Different from the organization structure of complex projects in Western countries, the Liang Zong hierarchical organization structure of complex projects in China has two different chains, the chief-engineer chain an... Different from the organization structure of complex projects in Western countries, the Liang Zong hierarchical organization structure of complex projects in China has two different chains, the chief-engineer chain and the general-director chain,to handle the trade-off between technical and management decisions. However, previous works on organization search have mainly focused on the single-chain hierarchical organization in which all decisions are regarded as homogeneous. The heterogeneity and the interdependency between technical decisions and management decisions have been neglected. A two-chain hierarchical organization structure mapped from a real complex project is constructed. Then, a discrete decision model for a Liang Zong two-chain hierarchical organization in an NK model framework is proposed. This model proves that this kind of organization structure can reduce the search space by a large amount and that the search process should reach a final stable state more quickly. For a more complicated decision mechanism, a multi-agent simulation based on the above NK model is used to explore the effect of the two-chain organization structure on the speed, stability, and performance of the search process. The results provide three insights into how, compared with the single-chain hierarchical organization, the two-chain organization can improve the search process: it can reduce the number of iterations efficiently; the search is more stable because the search space is a smoother hill-like fitness landscape; in general, the search performance can be improved.However, when the organization structure is very complicated, the performance of a two-chain organization is inferior to that of a single-chain organization. These findings about the efficiency of the unique Chinese-style organization structure can be used to guide organization design for complex projects. 展开更多
关键词 complex project two-chain hierarchical organization discrete decision model multi-agent simulation
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Influence ofγʹvolume fraction on creep of Ni-based superalloy through phase-field simulations 认领 引用 被引量：1
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作者 Min YANG Fan YANG +3 位作者 Jia CHEN Min GUO Hai-jun SU Jun ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第4期1168-1181,共14页
γʹvolume fraction(fv)plays a critical role in the mechanical properties of Ni-based single-crystal superalloys.A creep phase-field model is utilized to simulate the microstructure evolution and creep performance duri... γʹvolume fraction(fv)plays a critical role in the mechanical properties of Ni-based single-crystal superalloys.A creep phase-field model is utilized to simulate the microstructure evolution and creep performance during creep under different fv conditions.The influence mechanism of fv on creep properties is investigated based on the analysis of evolutions of internal stress and strain fields.As fv increases,the morphology ofγʹrafts changes from discontinuous to continuous,while the morphological change ofγchannels is opposite,the inclination ofγchannels from the[010]direction to(011)directions during tertiary creep first decreases and then increases,the creep life first increases and then decreases,and the main distribution of creep damage shifts fromγʹtoγʹ/γinterfaces andγchannels.The longest creep life under fv of 0.65 can be attributed to the stableγʹraft structure,the lowest stress and strain inγchannels,and the slowest damage accumulation. 展开更多
关键词 phase-field simulation internal stress internal strain creep behavior single-crystal superalloys
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Hydrate agglomeration modeling and pipeline hydrate slurry flow behavior simulation 认领 引用 被引量：9
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作者 Guangchun Song Yuxing Li +3 位作者 Wuchang Wang Kai Jiang Zhengzhuo Shi Shupeng Yao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第1期32-43,共12页
Dynamic modeling and numerical simulation of hydrate slurry flow behavior are of great importance to offshore hydrate management.For this purpose, a dynamic model of hydrate agglomeration was proposed in this paper.Ba... Dynamic modeling and numerical simulation of hydrate slurry flow behavior are of great importance to offshore hydrate management.For this purpose, a dynamic model of hydrate agglomeration was proposed in this paper.Based on population balance equation, the frame of the dynamic model was established first, which took both hydrate agglomeration and hydrate breakage into consideration.Then, the calculating methods of four key parameters involved in the dynamic model were given according to hydrate agglomeration dynamics.The four key parameters are collision frequency, agglomeration efficiency, breakage frequency and the size distribution of sub particles resulting from particle breakage.After the whole dynamic model was built, it was combined with several traditional solid–liquid flow models and then together solved by the CFD software FLUENT 14.5.Finally, using this method, the influences of flow rate and hydrate volume fraction on hydrate particle size distribution, hydrate volume concentration distribution and pipeline pressure drop were simulated and analyzed. 展开更多
关键词 Hydrate Agglomeration Flow behavior Dynamic model Numerical simulation Population balance
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Achievement of Fish School Milling Motion Based on Distributed Multi-agent Reinforcement Learning 认领 引用
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作者 Jincun Liu Yinjie Ren +3 位作者 Yang Liu Yan Meng Dong An Yaoguang Wei 《Journal of Bionic Engineering》 SCIE EI CSCD 2025年第4期1683-1701,共19页
In recent years,significant research attention has been directed towards swarm intelligence.The Milling behavior of fish schools,a prime example of swarm intelligence,shows how simple rules followed by individual agen... In recent years,significant research attention has been directed towards swarm intelligence.The Milling behavior of fish schools,a prime example of swarm intelligence,shows how simple rules followed by individual agents lead to complex collective behaviors.This paper studies Multi-Agent Reinforcement Learning to simulate fish schooling behavior,overcoming the challenges of tuning parameters in traditional models and addressing the limitations of single-agent methods in multi-agent environments.Based on this foundation,a novel Graph Convolutional Networks(GCN)-Critic MADDPG algorithm leveraging GCN is proposed to enhance cooperation among agents in a multi-agent system.Simulation experiments demonstrate that,compared to traditional single-agent algorithms,the proposed method not only exhibits significant advantages in terms of convergence speed and stability but also achieves tighter group formations and more naturally aligned Milling behavior.Additionally,a fish school self-organizing behavior research platform based on an event-triggered mechanism has been developed,providing a robust tool for exploring dynamic behavioral changes under various conditions. 展开更多
关键词 Collective motion Collective behavior Self-organization Fish school Multi-agent reinforcement learning
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