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Simulation of the Specific Contributions of Molecular Weight,Orientation Degree,and Crystallinity to the Tensile Mechanics of Polyethylene Fibers 认领 引用 被引量：1
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作者 Tian-Hao Yang Jing-Han Wu +4 位作者 Ming-Ming Ding Wen Zhai Ke Wang Qiang Fu Yang Liu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第2期560-575,I0018,共16页
UHMWPE fibers exhibit impressive modulus and strength,but they have not reached their theoretical limits.Researchers focus on molecular weight,orientation,and crystallinity of UHMWPE,yet their contributions to mechani... UHMWPE fibers exhibit impressive modulus and strength,but they have not reached their theoretical limits.Researchers focus on molecular weight,orientation,and crystallinity of UHMWPE,yet their contributions to mechanical properties are unclear.Molecular dynamics simulations are valuable but often limited by computational constraints.Our aim is to simulate higher molecular weights to better represent real UHMWPE fibers.We used Packmol and Polyply methodologies to construct PE systems,with Polyply reproducing more reasonable properties of UHMWPE fibers.Additionally,tensile simulations showed that orientation and crystallinity greatly impact Young's modulus more than molecular weight.Energy decomposition indicated that higher molecular weights lead to covalent bonds that can withstand more energy during stretching,thus increasing breaking strength.Combining simulations with machine learning,we found that orientation has the most significant impact on Young's modulus,contributing 60%,and molecular weight plays the most crucial role in determining the breaking strength,accounting for 65%.This study provides a theoretical basis and guidelines for enhancing UHMWPE's modulus and strength. 展开更多
关键词 Molecular dynamics simulation Polyethylene fiber Mechanical properties
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Preparation of high-purity tellurium based on simulation-assisted zone refining 认领 引用 被引量：1
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作者 Qing-hua TIAN Zhi-qiang HE +2 位作者 Zhi-peng XU Hai-bei WANG Liu ZHU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第2期638-648,共11页
The effect of temperature on molten zone length was investigated through simulation to optimize the control of molten zone length during the experimental process. The temperature gradient distribution within the molte... The effect of temperature on molten zone length was investigated through simulation to optimize the control of molten zone length during the experimental process. The temperature gradient distribution within the molten zone during zone refining was simulated using COMSOL Multiphysics software and experimentally validated. The simulated molten zone length showed good agreement with the actual measured length. The experimental study of tellurium purification by zone refining was conducted under the following conditions: three passes of zone refining, a hydrogen flow rate of 0.5 L/min, and molten zone movement speeds of 0.5 and 1.0 mm/min. The results demonstrated that the removal efficiencies of impurities such as Ca and Cu exceeded 95%, while the removal efficiency of phosphorus (P) reached over 70%. And the purity of tellurium reached 6N. 展开更多
关键词 high purity tellurium simulation zone refining molten zone length
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Molecular Dynamics Simulation of Tribological Properties of PES Under Conditions of Positive and Negative Pressure 认领 引用 被引量：1
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作者 Zhichao Xin Guilian Wang Hang Zhang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第2期190-200,共11页
Polyethersulfone(PES)can be widely used in extreme environments due to its exceptional strength and stability.In this study,molecular dynamics(MD)simulations were used to construct tribological models of PES under var... Polyethersulfone(PES)can be widely used in extreme environments due to its exceptional strength and stability.In this study,molecular dynamics(MD)simulations were used to construct tribological models of PES under varying pressures.The variations of PES molecular chains and frictional interface properties were explored for understanding microscopic tribological mechanism.The simulation results show that high pressure and high vacuum conditions reduce the coefficient of friction and wear rate.The variations in radial distribution function(RDF),relative concentration of atoms,friction interface temperature,and atomic motion velocity were analyzed.It was found that high pressure and high vacuum promote PES molecular chains moving away from the surface of the iron atomic layer,decreasing interaction energy,RDF,temperature,and velocity at the friction interface.This work offers novel methodologies and theoretical insights for studying the friction and wear of polymer composites in complex environments. 展开更多
关键词 PES Friction MD simulation Adsorption energy
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Simulation Analysis of Thermal Load and Ultimate Bearing Capacity of Hull Girder Under Cabin Fire 认领 引用 被引量：1
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作者 Chenfeng Li Guanchen Wei +2 位作者 Zixiong Kang Houyao Zhang Xueqian Zhou 《哈尔滨工程大学学报（英文版）》 CSCD 2026年第3期758-774,共17页
The hull structure may collapse or deform severely under fire conditions.In this study,the safety of a ship's cabin structure under fire is evaluated using a dual-zone large eddy fire scenario simulation method an... The hull structure may collapse or deform severely under fire conditions.In this study,the safety of a ship's cabin structure under fire is evaluated using a dual-zone large eddy fire scenario simulation method and a sequential thermo-mechanical coupling analysis method.Taking a three-compartment section of a naval surface ship as a case study,a machinery room fire scenario was simulated and the fire temperature field was analyzed.Through a dedicated data interface,the full-field time-varying temperature loads were mapped to the finite element model of the compartment section,thereby achieving thermo-mechanical coupled analysis of the cabin structure.The effects of thermal expansion on the hull structure under rising fire temperatures were considered in the evaluation of the residual load-bearing capacity of the cabin.The results indicate that the residual load-bearing capacity of the compartment is closely linked to the fire development stage.Temperature not only significantly affects the mechanical properties of steel but also influences the structural load-bearing capacity through thermally stresses. 展开更多
关键词 Ship and ocean engineering Cabin fire Fire simulation Thermal load Thermo-mechanical coupling analysis Residual bearing capacity
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基于Plant Simulation的液压支架切割线物流系统建模及仿真研究 认领 引用 被引量：1
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作者 闫书廷 段青辰 +2 位作者 李炳正 韩越 尚军鑫 《煤矿机械》 2026年第4期238-241,共4页
针对离散型制造业中典型产品液压支架的切割线,采用物流仿真软件Plant Simulation进行物流系统建模及仿真。通过定义钢板仓储、智能行车、智能AGV、激光及火焰切割机、分拣线等相关元素,编写不同元素方法逻辑,对某型号液压支架生产钢板... 针对离散型制造业中典型产品液压支架的切割线,采用物流仿真软件Plant Simulation进行物流系统建模及仿真。通过定义钢板仓储、智能行车、智能AGV、激光及火焰切割机、分拣线等相关元素,编写不同元素方法逻辑,对某型号液压支架生产钢板切割过程进行仿真,分析设备利用率等关键参数,验证了现有设备产能够满足该液压支架的高效生产需求,为智能排产决策提供数据支撑。 展开更多
关键词 液压支架 切割线 物流系统仿真 Plant Simulation
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OptimizationDesign and Numerical Simulation of Variable Tube Diameter Heat Exchanger for Split Air Conditioning Indoor Unit 认领 引用 被引量：1
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作者 Zheming Cheng Xinping Ou Yang +2 位作者 Leren Tao Zihao Wang Ke Sun 《Frontiers in Heat and Mass Transfer》 EI CAS 2026年第1期288-313,共26页
Energy shortage has become one of themost concerning issues in the world today,and improving energy utilization efficiency is a key area of research for experts and scholars worldwide.Small-diameter heat exchangers of... Energy shortage has become one of themost concerning issues in the world today,and improving energy utilization efficiency is a key area of research for experts and scholars worldwide.Small-diameter heat exchangers offer advantages such as reduced material usage,lower refrigerant charge,and compact structure.However,they also face challenges,including increased refrigerant pressure drop and smaller heat transfer area inside the tubes.This paper combines the advantages and disadvantages of both small and large-diameter tubes and proposes a combined-diameter heat exchanger,consisting of large and small diameters,for use in the indoor units of split-type air conditioners.There are relatively few studies in this area.In this paper,A theoretical and numerical computation method is employed to establish a theoretical-numerical calculation model,and its reliability is verified through experiments.Using this model,the optimal combined diameters and flow path design for a combined-diameter heat exchanger using R32 as the working fluid are derived.The results show that the heat transfer performance of all combined diameter configurations improves by 2.79%to 8.26%compared to the baseline design,with the coefficient of performance(COP)increasing from 4.15 to 4.27~4.5.These designs can save copper material,but at the cost of an increase in pressure drop by 66.86%to 131.84%.The scheme IIIH,using R32,is the optimal combined-diameter and flow path configuration that balances both heat transfer performance and economic cost. 展开更多
关键词 Split air condition variable tube diameter enhanced heat transfer numerical simulation structural design optimization
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Numerical and physical simulations of acoustic imaging for adjacent well detection while drilling 认领 引用
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作者 Teng Zhao Gen-Sheng Li +3 位作者 Xiao-Hua Che Wen-Xiao Qiao Jun-Qiang Lu Bai-Yong Men 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1197-1219,共23页
With increase in the number of operations involving relief wells,radial wells,U-shaped wells,and other complex well structures,challenges such as collision prevention,obstacle bypassing,and adjacent-well connectivity ... With increase in the number of operations involving relief wells,radial wells,U-shaped wells,and other complex well structures,challenges such as collision prevention,obstacle bypassing,and adjacent-well connectivity achievement during drilling have become inevitable.These challenges necessitate a technology that can accurately detect adjacent wells in real time during drilling operations.As current borehole acoustic reflection imaging technology heavily relies on cable-based logging,it cannot perform real-time detection of adjacent wells during drilling,thereby limiting the drilling efficiency.This study proposes a new adjacent-well-acoustic-detection-while-drilling method that integrates wireline borehole acoustic reflection imaging with drilling technology,along with an adjacent-well imaging method based on compressed sensing(CS).Together,these methods enable high-resolution,real-time detection of the adjacent target wells during drilling,ensuring safe and efficient underground drilling operations.The finite-difference method was used to simulate three-dimensional numerical models under drilling conditions for two scenarios—with and without target wells adjacent to the drilling well.Experimental validation was conducted in a water tank using an adjacent-well-acoustic-detection-while-drilling tool.The simulated target well was imaged using the CS method,and the imaging results were compared with those obtained from numerical and physical simulations,thereby validating the feasibility of the proposed acoustic detection and imaging methods.The results demonstrate that as the radial distance from the target well increases,the PP echo exhibits delayed arrival times and approaches a plane wave while exhibiting amplitude attenuation.Conversely,a linear increase in the target well diameter advances the PP echo arrival time and enhances its amplitude proportionally.When the target and drilling wells are approximately parallel with a small intersection angle,PP echoes yield better detection results than SS echoes;when the wells are coplanar with a large intersection angle,SS echoes provide better detection results.The receiver element aligned with the target well's azimuth detects all echo modes with the earliest arrival times and highest amplitudes.The adjacent-well imaging method based on CS offers very high spatial resolution,with target wells appearing as local amplitude maxima.This feature enables the precise determination of their azimuth and inclination relative to the drilling wells.The findings offer a solid physical and methodological foundation for real-time detection of adjacent wells during drilling operations and demonstrate enormous theoretical and engineering application potential. 展开更多
关键词 Adjacent well detection Acoustic logging while drilling Compressed sensing Numerical simulation Physical simulation
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Broadband ground motion simulation and analysis of a near-fault 3D basin-mountain coupling site based on the hybrid method 认领 引用 被引量：1
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作者 Liu Zhongxian Tang Kang +2 位作者 Li Chengcheng Yuan Xiaoming Zhang Hai 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第1期87-110,共24页
This study presents an effective hybrid simulation approach for simulating broadband ground motion in complex near-fault locations.The approach utilizes a deterministic approach based on the spectral element method(SE... This study presents an effective hybrid simulation approach for simulating broadband ground motion in complex near-fault locations.The approach utilizes a deterministic approach based on the spectral element method(SEM),which is used to simulate low-frequency ground motion(f1 Hz).A fourth-order Butterworth filter with zero phase shift is employed for time-domain filtering of low-and high-frequency time series at a crossover frequency of 1 Hz,merging the low and high-frequency ground motions into a broadband time series.Taking an Ms 6.8 Luding earthquake,as an example,this hybrid method was used for a rapid and efficient simulation analysis of broadband ground motion in the region.The accuracy and efficiency of this hybrid method were verified through comparisons with actually observed station data and empirical attenuation curves.Deterministic method simulation results revealed the effects of mountainous topography,basin effects,nonlinear effects within the basin’s sedimentary layers,and a coupling interaction between the basin and the mountains.The findings are consistent with similar studies,showing that near-fault sedimentary basins significantly focus and amplify strong ground motion,and the soil’s nonlinear behavior in the basin influences ground motion to varying extents at different distances from the fault.The mountainous topography impacts the basin’s response to ground motion,leading to barrier effects.This research provides a scientific foundation for seismic zoning,urban planning,and seismic design in nearfault mountain basin regions. 展开更多
关键词 hybrid ground motion simulation method spectral element method three-dimensional stochastic finite fault method near-fault basin-mountain coupling effect basin effect nonlinear effect
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Variable pseudo-particle modeling for molecular dynamics simulation 认领 引用
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作者 Tianhao Qiu Mingcan Zhao +2 位作者 Chengxiang Li Yaning Zhang Wei Ge 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第3期218-230,共13页
Hard sphere(HS)models are efficient for molecular dynamics simulation of dilute gases,but exhibit limitations for dense and real gases due to its oversimplification of molecular interactions.To improve simulation accu... Hard sphere(HS)models are efficient for molecular dynamics simulation of dilute gases,but exhibit limitations for dense and real gases due to its oversimplification of molecular interactions.To improve simulation accuracy for real gases,the variable hard sphere(VHS)model has been proposed.However,similar to the HS model,VHS is difficult to parallelize in computing due to its inherent serial algorithm.The pseudo-particle modeling(PPM),based on a modified HS model,can circumvent this difficulty to some extent and,when further coupled with HS,can achieve almost linear scalability at large-scales,but it is still difficult to accurately simulate real gases.In this work,a variable-diameter model based on PPM(VPPM)was proposed,in which the collision diameter is dynamically determined by the timestep and relative velocity of colliding particle pairs.Through systematic investigation of gas system properties including the mean free path,compressibility factor,and self-diffusion coefficient,the VPPM simulation shows excellent agreement with the VHS results,confirming both the model's effectiveness and successful coupling of VHS and VPPM.Furthermore,the viscosity coefficients of three-dimensional real gases obtained by VPPM in the temperature range of 300-2000 K are consistent with experimental data,with a maximum relative deviation of only 3.7%,significantly outperforming conventional PPM(48% deviation)and Chapman-Enskog theory(35% deviation).It demonstrates that VPPM is highly suitable for accurate and large-scale parallel simulations of real gases,particularly in high temperaturegradient systems such as gas-solid catalytic reaction,gas diffusion,adsorption and separation in chemical engineering,and aerospace applications,especially under significant temperature gradients. 展开更多
关键词 Variable-diameter model Molecular simulation HS-PPM coupling Viscosity Model
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Molecular Simulations of Dynamic Heterogeneity of Segment Motion and Bond Exchange in Polymer Vitrimers 认领 引用
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作者 Lang Shuai Jiang-Long Li +4 位作者 Jian-Long Wen Ying-Ying Xu Shui Yu Bo-Yu Ding Yi-Jing Nie 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第1期242-255,I0017,共14页
Vitrimers belong to a class of polymeric materials capable of bond exchange reactions,showing great promise for environmental protection and sustainable development.However,studies on the coupling mechanism between th... Vitrimers belong to a class of polymeric materials capable of bond exchange reactions,showing great promise for environmental protection and sustainable development.However,studies on the coupling mechanism between the bond exchange kinetics and segmental dynamics near the glass transition temperature(Tg)remain scarce.Herein,we employed molecular dynamics simulations to investigate the dynamic heterogeneity of the segment motion and bond exchange in vitrimers.The simulation results revealed that the bond exchange energy barrier exerts a much stronger influence on the bond exchange kinetics than on the segmental dynamics.At lower temperatures,slower segmental relaxation further constraind the bond exchange rate.Additionally,increasing the bond exchange energy barrier markedly enhanced the dynamic heterogeneity of segment motion.A close correlation was observed between heterogeneity and bond exchange.This study elucidated the coupling mechanism between bond exchange and segmental dynamics at the molecular scale,thereby providing a theoretical basis for designing vitrimer materials with tunable dynamic properties. 展开更多
关键词 Molecular dynamics simulations Vitrimers Dynamic heterogeneity
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Optimizing energy efficiency in fluid catalytic cracking units with GA and NSGA-Ⅱ:A comprehensive simulation and multi-factor analysis 认领 引用
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作者 Rui Han Qingshan Guan +6 位作者 Leqi Gu Xiaoyan Sun Tophet Wongladprom Vissanu Meeyoo Jengshiun Lim Li Xia Shuguang Xiang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2026年第5期169-180,共12页
The global pursuit of carbon neutrality demands innovative strategies to decarbonize energy-intensive sectors,among which energy-saving optimization represents one of the most critical measures.As one of the largest e... The global pursuit of carbon neutrality demands innovative strategies to decarbonize energy-intensive sectors,among which energy-saving optimization represents one of the most critical measures.As one of the largest energy consumers in refineries,the Fluid Catalytic Cracking Unit(FCCU)offers significant potential for energy savings and carbon emission reduction.This study presents a comprehensive simulation-optimization framework for enhancing the performance of FCCU,integrating process simulation,thermodynamic analysis,and evolutionary optimization under industrial operational constraints.Genetic Algorithm(GA)and Non-dominated Sorting Genetic Algorithm-Ⅱ(NSGA-Ⅱ)were employed for multi-objective optimization of energy efficiency,product yield,and economic revenue.A TOPSIS decision-making method was incorporated to identify the most favorable trade-off solutions from the Pareto front.Dual-objective optimization achieved balanced trade-offs between conflicting objectives.Specifically,the energy-yield optimization reduced energy consumption by 3.28%and increased product yield by 1.95%,resulting in a 9.63%decrease in energy use compared to the singleobjective yield maximization case.Similarly,the energy-revenue optimization reduced energy consumption by 1.17%and increased revenue by 0.25%,resulting in a 5.42%decrease in energy use compared to the single-objective revenue maximization case.Economic and environmental assessments confirm system-level decarbonization,with pollutant(CO2/SO2/NOx)emissions reduced by 2.30%(energy-yield)and 3.34%(energy-revenue),respectively.These results demonstrate the effectiveness of the proposed multi-objective framework and its potential as a transferable tool for performance enhancement and decarbonized,sustainable operation across FCCUs and broader refining systems. 展开更多
关键词 Fluid catalytic cracking unit Simulation Optimization Thermodynamics TOPSIS decision-making
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Experimental study and 3D cellular automaton simulation of intergranular corrosion on laser-welded joints of Al-Cu-Li alloys under acidic conditions 认领 引用
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作者 Xinzhi Yang Gan Tian +4 位作者 Dejun Liu Biyun Ren Hui Cai Mengqing Liu Yan Zhang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第4期314-329,共16页
This study proposes a multi-scale research approach that integrates micro-characterization experiments and 3D cellular automata(CA)simulations to investigate the intergranular corrosion(IGC)behavior of equiaxed grains... This study proposes a multi-scale research approach that integrates micro-characterization experiments and 3D cellular automata(CA)simulations to investigate the intergranular corrosion(IGC)behavior of equiaxed grains in the fusion zone(FZ)of laser-welded joints of Al-Cu-Li alloys under acidic conditions.Combined with microscopic characterizations such as SEM and TEM,the significant segregation phe-nomenon of grain boundaries in the FZ of the laser welded joint of 2195-T8 aluminum-lithium alloy was revealed,and the typical morphologies of IGC in the FZ under two different concentrations of nitric acid were compared.Compared to the traditional CA model,the proposed approach uses the Voronoi method combined with experimental characterization data to reconstruct a polycrystalline micro-structural model.For the first time,the effects of grain boundary segregation and localized corrosion intensity on corrosion morphologies were incorporated.A CA model comprising seven cell types and five evolution rules was systematically developed,enabling the simulation of both overall uniform corrosion and localized grain boundary dissolution,as well as corrosion channel propagation in the FZ under acidic conditions.By employing neural network based parameter fitting,the model accurately captures the IGC depth evolution and the expansion characteristics of corrosion channels,thereby reproducing the local damage morphologies of the FZ after immersion corrosion.This study provides theoretical support for corrosion-resistant design of high-strength aluminum alloy welded joints and holds significant engineering value in enhancing the service life of aluminum components. 展开更多
关键词 Intergranular corrosion Cellular automata Simulation model Al-Cu-Li alloy
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Numerical simulation study on intermittent swimming characteristics of octopus based on the eight-arm undulation mechanism 认领 引用
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作者 Wenhua Chu Liuyang Pan +3 位作者 Yaze Song Jifeng Yan Qiaoli Zhou Zijing Zhao 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第3期471-488,共18页
The swimming mechanism of octopuses has been a hot topic in the field of biology in recent years.Existing research primarily focuses on the influence of morphological parameters on octopus swimming ability;the impact ... The swimming mechanism of octopuses has been a hot topic in the field of biology in recent years.Existing research primarily focuses on the influence of morphological parameters on octopus swimming ability;the impact of kinematic parameters remains relatively unexplored.This study focuses on the swimming posture and movement characteristics of octopuses,formulating a synchronized flexible undulation equation for their eight arms.Based on this,computational fluid dynamics combined with dynamic mesh technology is employed to numerically simulate their propulsion mechanism and swimming characteristics.Furthermore,by varying the hover coast time ratio and duty cycle,the influence of different kinematic parameters on propulsion efficiency is explored(close phase after hover coast time ratio is defined as DSC;open phase after hover coast time ratio is defined as DSO,and the duty cycle is defined as DC).The results indicate that the periodic opening and closing motion of the octopus leads to the alternating generation and dissipation of reverse vortices in the wake field,with the jet effect between them being the primary source of propulsion.When DSC=0.30,the forward speed of the octopus after 1 s is only 6%lower than that without hover coast behavior.When DSO=0.30,the peak thrust coefficient of the octopus reaches 0.82,which is 15%higher than that without hover coast behavior,indicating the highest burst acceleration.On the other hand,when DC=0.67,under asymmetric periodic swimming with fast-closing-slow-opening,the average thrust coefficient reaches 0.26,an increase of 23.8%compared to uniform opening-closing periodic swimming,while the average lateral force coefficient decreases by 66.7%.In this scenario,the octopus can achieve better forward propulsion and maintain stable movement.The findings of this study provide valuable insights for research on the intermittent swimming behavior of octopuses and underwater vehicles. 展开更多
关键词 Octopus Swimming characteristics Eight-arm undulation motion Numerical simulation
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A New Integrated Numerical Simulation Method for Fracturing-Shutin-Production of Shale Oil 认领 引用
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作者 Sheng Lei Guanglong Sheng Hui Zhao 《Energy Engineering》 EI 2026年第6期512-533,共22页
Multi-stage fractured horizontal wells are among the most prevalent technologies in contemporary shale oil development.is article provides a comprehensive overview of several prevalent issues by examining pertinent si... Multi-stage fractured horizontal wells are among the most prevalent technologies in contemporary shale oil development.is article provides a comprehensive overview of several prevalent issues by examining pertinent simulation methods applicable to existing fractured horizontal wells.First,traditional methods primarily concentrate on individual stages of fracturing,shut-in,and production.ese stages are relatively isolated and lack continuity.Second,the eects of reservoir stimulation vary under dierent operational conditions.e conventional dual(or multiple)porosity model is overly idealized,while analytical(or semi-analytical)models oen struggle to accurately represent actual fracture geometries and internal fracture-grid characteristics,which limits their ability to eectively describe heterogeneous stimulation eects.In response to these challenges,this paper enhances the singlestage research model employed in traditional approaches by conducting an integrated analysis and establishing a comprehensiveow simulation model that encompasses the entire cycle of fracturing,shut-in,and production stages.Additionally,we introduce the concept of zonal compositeow to partition the reservoir into multiple regions based on specic physical domain partitioning principles;distinct physical property distributions are assigned to eachow region.Furthermore,we improve upon the overall well-fracturing methodology found in traditional techniques by rigorously adhering to actual construction processes.is allows for simulations of common operating conditions such as single-stage fracturing,single multi-stage fracturing events,and pauses in construction between adjacent stages.Finally,utilizing this enhanced method enables us to dene evaluation indicators including eective pressure rise ratio(EPER),maximum pressure,and average pressure.We conduct a comparative analysis regarding how factors such as the number of fracturing stages,volume of fracturinguid injection,and duration of shut-in time inuence reservoir energy distribution.e research results show that for the model set up in this article,when the number of fractures is 20,the stimulated regions between fractures exactly overlap,resulting in an EPER of 20.09%,and the best transformation eect is achieved at this time.Additionally,it is determined that the ideal injection volume is 1400 m3 per unit thickness.e most eective duration for well shutdown is identied as 30 days;however,it should be noted that for varying scenarios,the best solution must be derived based on specic operational conditions. 展开更多
关键词 Shale oil integrated simulation fracturing-shut-in-production multi-stage fractured horizontal wells ow simulation
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Large-eddy simulations of oscillatory flow around a cylinder at high Keulegan-Carpenter and Reynolds numbers 认领 引用
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作者 Shaoshi Dai Dan Tang +1 位作者 Bassam A.Younis Chengwang Xiong 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第5期134-148,共15页
Large-eddy simulation based on a newly developed wall-adaptive local eddy-viscosity model is used to study the viscous oscillatory flow around a cylinder at high Keulegan-Carpenter(KC)and Reynolds(Re)numbers.The effic... Large-eddy simulation based on a newly developed wall-adaptive local eddy-viscosity model is used to study the viscous oscillatory flow around a cylinder at high Keulegan-Carpenter(KC)and Reynolds(Re)numbers.The efficacy of the new model,which was implemented in OpenFOAM,was first checked via simulations of a standard benchmark flow,namely that around a single cylinder in oscillatory flow at Re-600 and KC-2.08.These simulations accurately captured the Honj vortices observed in the measurements of Honji.Thereafter,simulations were performed for values of KC in the range 1.67≤KC≤66.7,where it was found that the evolution of the Honji vortices and streaked flow is influenced by the interactions that occur between the outer oscillation flow and the inner separated boundary layer.Further,it was found that these interactions are strongly dependent on this parameter,as are all the dimensionless coefficients for both the mean and fluctuating components of the hydrodynamic forces.At low values of KC and Re,frequency doubling resonance between the vortex shedding(fvo)and that of the oscillatory flow(fos)was observed.A new empirical relationship between fvo/fos,KC and Re is proposed. 展开更多
关键词 Large-eddy simulation Oscillatory flow Vortex shedding Hydrodynamic forces
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Atomic-scale simulations and experimental insights into the effect of precipitates on the hemming performance of 6xxx Al alloys 认领 引用
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作者 Yucheng Ji Feng Ding +5 位作者 Jiahao Wen Wentao Qin Chenyang Yao Xiang Xiao Guojun Wang Chaofang Dong 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期1994-2005,I0017-I0025,共12页
Al–Mg–Si alloys are widely employed in automotive vehicles;however,challenges such as cracking often arise during the hemming process(180°bending).Based on the molecular dynamics simulations and experiments,thi... Al–Mg–Si alloys are widely employed in automotive vehicles;however,challenges such as cracking often arise during the hemming process(180°bending).Based on the molecular dynamics simulations and experiments,this study investigated the effects of the size and number of MgSi(Fe)clusters on the mechanical properties of 6xxx Al alloys.The results showed that medium-sized MgSi clusters(containing 10–19 atoms)at the grain boundaries(GBs)enhanced the strength of the GBs,effectively inhibiting crack initiation and significantly suppressing intergranular cracking.In addition,the ductility and brittleness of the model with the Fe-containing phase were significantly affected by the Si/Fe atomic ratio(~0.71).Tensile experiments confirmed that the failure morphology exhibited a distinct brittle fracture when the Si/Fe atomic ratio of the phase was 0.90.The pre-aging treatment promoted the dispersion of solute atoms,thereby reducing the yield strength of the AA6016 Al alloy to~120 MPa,which improved its hemming performance.Furthermore,preaging facilitated the generation of finer Mg–Si phases at the GBs during bake hardening. 展开更多
关键词 Al alloys cluster hemming performance molecular dynamics simulations
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Direct numerical simulations of high-pressure impinging-jet atomization:Interfacial evolutions and spray characteristics 认领 引用
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作者 Bo WANG Erjun WU +4 位作者 Anlong YANG Feng ZHANG Baoe YANG Qingquan LIU Xiaodong CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期158-174,共17页
This study presents a numerical investigation of impinging-jet atomization across various Weber numbers(We) under high backpressure conditions.Using the volume-of-fluid method,adaptive mesh refinement,and the iso Adve... This study presents a numerical investigation of impinging-jet atomization across various Weber numbers(We) under high backpressure conditions.Using the volume-of-fluid method,adaptive mesh refinement,and the iso Advector interface reconstruction technique,atomization characteristics are simulated and analyzed for different values of We.The results indicate that the geometry induces turbulent jets,which drive turbulent atomization through the shear interactions at the gas–liquid interface.The key observed phenomena include the interaction of impact waves with liquid sheet perforation and the breakup of web of ligaments,both of which are prominent under high backpressure conditions.A novel method,based on the threshold velocity of spray droplet groups,is employed to quantitatively measure the spreading angle,showing that the angle increases with We in both front and side views.Additionally,the Sauter mean diameter of droplets follows power-law scaling with exponents of-1/3 in the upstream region and-1/2 in the downstream region,while the droplet size distribution conforms to a log-normal profile.This research provides valuable insights into interface evolution and droplet characteristics during impingingjet atomization under high backpressure,offering essential guidance for optimizing industrial atomization processes. 展开更多
关键词 Direct numerical simulations High-pressure Impinging-jet atomization Interfacial evolutions Spray characteristics
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Preliminary XFEL Experimental Simulation Platform Based on HSWAP Engine 认领 引用
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作者 LIU Jin DUAN Bowen +5 位作者 WEI Tao KANG Xu ZHAO Shicao DU Liangliang DENG Xiaoliang LI Xiaoya 《高压物理学报》 CAS CSCD 北大核心 2026年第6期42-51,共10页
X-ray free electron laser(XFEL)plays a critical role in diagnosing dynamic compression processes in micro-and meso-scale materials.To deepen our understanding of XFEL physics and optimize facility design,a preliminary... X-ray free electron laser(XFEL)plays a critical role in diagnosing dynamic compression processes in micro-and meso-scale materials.To deepen our understanding of XFEL physics and optimize facility design,a preliminary XFEL experimental simulation platform was developed based on the highperformance computing(HPC)simulation workflow application platform(HSWAP).HSWAP provides workflow,component,and data linkage models for XFEL experiments,enabling flexible simulation of diverse processes through modular configurations.This platform was employed to investigate X-ray diffraction(XRD)of microscale materials and phase contrast imaging(PCI)of meso-scale explosive samples.Simulation results for XRD of a metallic sample under shock loading and PCI of voids in explosive materials demonstrate the platform’s ability to accurately reproduce experimental dynamics.By integrating numerical models with data analysis,the platform enhances the design of XFEL experiments and provides a foundation for interpreting diagnostic capabilities in ultrafast processes.Future work will focus on refining simulation methods for meso-scale samples using phase-field approaches and high-Z materials under shock conditions. 展开更多
关键词 XFEL experimental simulation platform HSWAP engine X-ray diagnostics
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Thermal simulation method for researching solidification process of ductile iron pipe based on heat transfer similarity of characteristic unit of ductile iron pipe 认领 引用
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作者 Gan-chao Zhai Gong-ao Zhu +4 位作者 Shao-dong Hu Bin Yang Jie-yu Zhang Xiang-ru Chen Qi-jie Zhai 《China Foundry》 SCIE EI CAS CSCD 2026年第1期62-72,共11页
Centrifugal casting of ductile iron pipe is a high-temperature,semi-continuous production process.However,conducting laboratory research on the solidification process of centrifugal casting of ductile iron pipe presen... Centrifugal casting of ductile iron pipe is a high-temperature,semi-continuous production process.However,conducting laboratory research on the solidification process of centrifugal casting of ductile iron pipe presents significant challenges.In this study,a novel research method was introduced for investigating the solidification process of ductile iron pipe,namely thermal simulation of ductile iron pipe.Comparative research was conducted on the microstructure and properties of the thermal simulation sample and the ductile iron pipe.The findings indicate that the thermal simulation sample and ductile iron pipe exhibit good heat transfer similarity and microstructure similarity.The difference of cooling rate between thermal simulation sample and ductile pipe is less than 0.24℃·s-1,and the difference of microstructure content of free cementite,ferrite,and pearlite is less than 5%.The tensile strength of annealed ductile iron pipe is 466 MPa,with an elongation of 16.1%and a Brinell hardness of 156.5 HBW.In comparison,the tensile strength of annealed thermal simulation sample is 482.0 MPa,with an elongation of 15.5%and a Brinell hardness of 159.0 HBW.These results suggest that the thermal simulation experimental research method is both scientific and feasible,offering an objective,reliable,and cost-effective approach to laboratory research on ductile iron pipe. 展开更多
关键词 ductile iron pipe centrifugal casting thermal simulation microstructure mechanical property
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A multi-line laser scanning system design and evaluation framework based on physical simulation 认领 引用
20
作者 Yunpeng LI Yifan CHEN +3 位作者 Limei SONG Hongyi WANG Hongmin WANG Baozhen GE 《Optoelectronics Letters》 EI 2026年第5期268-274,共7页
We propose a multi-line laser simulation system utilizing computer graphics and physical simulation to generate virtual multi-line laser datasets.Our framework provides key physical properties of the scene,including c... We propose a multi-line laser simulation system utilizing computer graphics and physical simulation to generate virtual multi-line laser datasets.Our framework provides key physical properties of the scene,including camera parameters,depth values,surface normals,and the actual two-dimensional(2D)and three-dimensional(3D)coordinates of the laser stripe centers for each rendered image.Beyond,we construct a virtual line laser scanning image dataset with a complex background by simulating interactions between lasers and object surfaces with the Monte Carlo method.With the proposed framework and dataset,a multi-line laser extraction algorithm based on a robust sorting algorithm is proposed and tested,which utilizes distance-based error analysis,connected component labeling,and iterative optimization refinement techniques.Both simulation and actual experiments show that our method outperforms the other state-of-the-art multi-line laser stripe center extraction methods.The proposed framework can be applied to different types of laser scanning systems in the future. 展开更多
关键词 physical simulation computer graphics Robust sorting algorithm Monte Carlo method Multi line laser scanning simulating interactions las virtual line laser scanning image dataset
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