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The three-dimensional meshfree numerical manifold method based on parallel computing 认领 引用
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作者 Keqin Zhang Wei Wu +2 位作者 Danfeng Zhang Yanfei Kang Hehua Zhu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期360-371,共12页
The numerical manifold method,extensively utilized in numerical computations,faces significant challenges in generating complex manifold elements,particularly for three-dimensional applications.To overcome this challe... The numerical manifold method,extensively utilized in numerical computations,faces significant challenges in generating complex manifold elements,particularly for three-dimensional applications.To overcome this challenge,the meshfree numerical manifold method is developed by integrating the moving least-squares method into the numerical manifold method,effectively bypassing the need for meshing complex geometric objects.However,the implementation of the moving least-squares method introduces computational efficiency issues.To mitigate these,parallel computing methods have been incorporated,resulting in a tenfold increase in the speed of assembling the stiffness matrix with central processing unit parallelism,and a twentyfold increase with graphics processing unit parallelism.The static mechanical system equations for the meshfree numerical manifold method are derived using the Galerkin method.The method’s effectiveness and accuracy are then validated through a series of numerical experiments.The experiments demonstrated that the meshfree numerical manifold method achieves a high precision with minimal nodes and integration points.Additionally,positioning nodes outside the domain significantly improves computational accuracy at the boundaries. 展开更多
关键词 Meshfree numerical manifold method Three-dimensional computation Parallel computation Elastostatics Moving least-squares
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Coupled computational fluiddynamics–discrete-element method investigation of soil contact erosion under cyclic hydraulic loading:A multiscale perspective 认领 引用
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作者 Xianfeng Diao Guoqing Cai +3 位作者 Tao Liu Peiyun Zhang Yanlin Su Bangzheng Rao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第6期4812-4830,共19页
Tidal waves,intermittent rainfall,and fluctuations in water levels,which create cyclic hydraulic gradients,can exacerbate the migration of fine particles within soils and lead to deterioration in stability.However,mac... Tidal waves,intermittent rainfall,and fluctuations in water levels,which create cyclic hydraulic gradients,can exacerbate the migration of fine particles within soils and lead to deterioration in stability.However,macroscale experimental methods struggle to capture the microscopic deformations that occur during seepage-induced erosion.Therefore,this study,which is based on the coupled computational fluid dynamics–discrete element method(CFD–DEM)coupling method,investigates the contact mechanical mechanisms that induce macroscopic deformation under cyclic hydraulic gradients by considering the effects of different amplitudes and frequencies.The results show that the erosion mass of fine particles increases in a stepwise manner,with a multipeak variation in the erosion rate,and both the erosion amount and intensity are greater under constant gradient conditions.Fine particles erode primarily near the contact surface and,after migration,accumulate mainly in the coarse particle layers close to the contact surface.Increasing the amplitude and frequency of the cyclic hydraulic gradient leads to more fine particle blockages within the coarse particle layer.The cyclic hydraulic gradient causes the contact force chain network to repeatedly break and reorganize,reducing the shear strengths of the soil and resulting in more pronounced anisotropy in the contact force distribution. 展开更多
关键词 Computational fluid dynamics–discrete element method(CFD–DEM)coupling Contact erosion Cyclic hydraulic gradients Macroscopic deformation Micromechanism
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A data-driven integrated optimization method of macroscopic topology and microscopic configuration for the graded functional cellular structures 认领 引用
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作者 Yu Guo Yijie Lu +2 位作者 Zhengwei Zhang Yanguo Zhou Hui Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期473-495,共23页
In the topology optimization of the multiscale structure,how to ensure the connectivity between adjacent microstructures,how to control the design space of microstructures,and how to reduce the amount of calculation a... In the topology optimization of the multiscale structure,how to ensure the connectivity between adjacent microstructures,how to control the design space of microstructures,and how to reduce the amount of calculation and improve calculation efficiency are three basic challenging issues currently faced.To this end,this paper proposes a data-driven approach to achieve the integrated optimization of macroscopic topology and microscopic configuration of the graded functional cellular structures.At the macro level,a topological description function is introduced to realize the topological control of the macrostructure.At the micro level,several cutting functions are used to realize the control of the configuration and size of the microstructure.The integrated optimization design of macro and micro cellular structures can be realized.Based on the computational homogenization method and numerical integration technology,an optimization problem independent offline microstructure database is established at the microscopic scale,where the relationship between the equivalent elastic parameters,relative pseudo-density,and design variables of the microstructure is stored.Based on this offline database,the entire topology optimization process is completed only on a macro scale,which greatly reduces the amount of calculation and improves calculation efficiency.In addition,implicit geometric modeling of full-scale cellular structures can be achieved using the reconstruction technique introduced in this work,which ensures smooth connection between adjacent microstructures.Finally,numerical examples are used to verify the effectiveness of the algorithm and the superiority of gradient cellular structures compared with single-scale structures. 展开更多
关键词 Graded cellular structure Integrated optimization Data-driven Computational homogenization M-VCUT Level set method
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Assessment of slurry chamber clogging alleviation during ultra-large-diameter slurry tunnel boring machine tunneling in hard-rock using computational fluid dynamics-discrete element method:A case study 认领 引用 被引量：2
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作者 Yidong Guo Xinggao Li +2 位作者 Dalong Jin Hongzhi Liu Yingran Fang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第8期4715-4734,共20页
To fundamentally alleviate the excavation chamber clogging during slurry tunnel boring machine(TBM)advancing in hard rock,large-diameter short screw conveyor was adopted to slurry TBM of Qingdao Jiaozhou Bay Second Un... To fundamentally alleviate the excavation chamber clogging during slurry tunnel boring machine(TBM)advancing in hard rock,large-diameter short screw conveyor was adopted to slurry TBM of Qingdao Jiaozhou Bay Second Undersea Tunnel.To evaluate the discharging performance of short screw conveyor in different cases,the full-scale transient slurry-rock two-phase model for a short screw conveyor actively discharging rocks was established using computational fluid dynamics-discrete element method(CFD-DEM)coupling approach.In the fluid domain of coupling model,the sliding mesh technology was utilized to describe the rotations of the atmospheric composite cutterhead and the short screw conveyor.In the particle domain of coupling model,the dynamic particle factories were established to produce rock particles with the rotation of the cutterhead.And the accuracy and reliability of the CFD-DEM simulation results were validated via the field test and model test.Furthermore,a comprehensive parameter analysis was conducted to examine the effects of TBM operating parameters,the geometric design of screw conveyor and the size of rocks on the discharging performance of short screw conveyor.Accordingly,a reasonable rotational speed of screw conveyor was suggested and applied to Jiaozhou Bay Second Undersea Tunnel project.The findings in this paper could provide valuable references for addressing the excavation chamber clogging during ultra-large-diameter slurry TBM tunneling in hard rock for similar future. 展开更多
关键词 Slurry tunnel boring machine(TBM) Short screw conveyor Slurry chamber clogging Computational fluid dynamics-discrete element method(CFD-DEM)coupled modeling Engineering application
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MatDEM-fast matrix computing of the discrete element method 认领 引用 被引量：8
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作者 Chun Liu Hui Liu Hongyong Zhang 《Earthquake Research Advances》 CSCD 2021年第3期1-7,共7页
Discrete element method can effectively simulate the discontinuity,inhomogeneity and large deformation and failure of rock and soil.Based on the innovative matrix computing of the discrete element method,the highperfo... Discrete element method can effectively simulate the discontinuity,inhomogeneity and large deformation and failure of rock and soil.Based on the innovative matrix computing of the discrete element method,the highperformance discrete element software MatDEM may handle millions of elements in one computer,and enables the discrete element simulation at the engineering scale.It supports heat calculation,multi-field and fluidsolid coupling numerical simulations.Furthermore,the software integrates pre-processing,solver,postprocessing,and powerful secondary development,allowing recompiling new discrete element software.The basic principles of the DEM,the implement and development of the MatDEM software,and its applications are introduced in this paper.The software and sample source code are available online(http://gffzz7a728f6edf654f13hucww9nv5wunw66x6.ffgz.tsg.suse.edu.cn). 展开更多
关键词 Discrete element method High-performance MatDEM Matrix computing
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CT-derived fractional flow reserve combined with atherosclerotic extent to determine long-term outcomes in diabetic patients with coronary artery disease 认领 引用 被引量：2
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作者 Zhi-Qiang WANG Zhen-Nan LI +1 位作者 Zhi-Hui HOU Bin LU 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2026年第1期27-35,共9页
Background There is still limited data on predictive value of coronary computed tomography angiography(CCTA)–derived fractional flow reserve(CT-FFR) for long term outcomes. We examined the long-term prognostic value ... Background There is still limited data on predictive value of coronary computed tomography angiography(CCTA)–derived fractional flow reserve(CT-FFR) for long term outcomes. We examined the long-term prognostic value of CT-FFR combined with CCTA–defined atherosclerotic extent in diabetic patients with coronary artery disease(CAD).Methods A retrospective pooled analysis of individual patient data was performed. Deep-learning-based vessel-specific CTFFR was calculated. All patients enrolled were followed-up for at least 5 years. Predictive abilities for major adverse cardiac events(MACE) were compared among three models(model 1), constructed using clinical variables;model 2, model 1+CCTA–derived atherosclerotic extent(Leiden risk score);and model 3, model 2+CT-FFR.Results A total of 480 diabetic patients [median age, 61(55–66) years;52.9% men] were included. During a median follow-up time of 2197(2126–2355) days, 55 patients(11.5%) experienced MACE. In multivariate-adjusted Cox models, Leiden risk score(HR: 1.06;95% CI: 1.01–1.11;P = 0.013) and CT-FFR ≤ 0.80(HR: 6.54;95% CI: 3.18–13.45;P < 0.001) were the independent predictors. The discriminant ability was higher in model 2 than in model 1(C-index, 0.75 vs. 0.63;P < 0.001) and was further promoted by adding CT-FFR to model 3(C-index, 0.81 vs. 0.75;P = 0.002). Net reclassification improvement(NRI) was 0.19(P = 0.009) for model 2 beyond model 1. Of note, adding CT-FFR to model 3 also exhibited significantly improved reclassification compared with model 2(NRI = 0.14;P = 0.011).Conclusion In diabetic patients with CAD, CT-FFR provides robust and incremental prognostic information for predicting longterm outcomes. The combined model exhibits improved prediction abilities, which is beneficial for risk stratification. 展开更多
关键词 fractional flow reserve ct ffr coronary artery disease cad methods tomography angiography ccta derived coronary artery disease atherosclerotic extent fractional flow reserve diabetic patients coronary computed tomography angiography
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Joint computation offloading and service downloading in satellite edge computing networks 认领 引用
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作者 Wu Qi Zhu Lidong 《China Communications》 SCIE EI CSCD 2026年第4期238-258,共21页
The limited onboard cache and computing resources significantly constrain the computational service capabilities of individual edge satellites in hotspot regions.To address this challenge,we propose a twotier cloud-ed... The limited onboard cache and computing resources significantly constrain the computational service capabilities of individual edge satellites in hotspot regions.To address this challenge,we propose a twotier cloud-edge computing architecture that organizes edge satellites and their associated ground clouds into multiple collaborative domains.Within each domain,we formulate a joint optimization problem for computation offloading and service downloading under the constraints of edge satellites’service deployment and caching space,aiming to minimize the sum of weighted energy consumption and latency.The originally non-convex problem is transformed into a more tractable convex optimization formulation through variable relaxation.Subsequently,we develop an alternating direction method of multipliers(ADMM)-based distributed optimization framework that enables cooperative decision-making among domain satellites for the optimization of computational offloading,service downloading,and service deleting variables.Additionally,we propose an innovative binary variable recovery algorithm that ensures feasible conversion from continuous solutions to discrete decision variables while preserving constraint satisfaction.Extensive simulations demonstrate that our approach achieves lower task execution cost and packet loss rate compared with benchmarks. 展开更多
关键词 alternating direction method of multipliers(ADMMs) cloud-edge computing architecture computation offloading edge satellites service downloading
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Computing methods for icosahedral and symmetry-mismatch reconstruction of viruses by cryo-electron microscopy 认领 引用
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作者 Bin Zhu Lingpeng Cheng Hongrong Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第5期12-21,共10页
Three-dimensional(3 D)reconstruction of icosahedral viruses has played a crucial role in the development of cryoelectron microscopy single-particle reconstruction,with many cryo-electron microscopy techniques first es... Three-dimensional(3 D)reconstruction of icosahedral viruses has played a crucial role in the development of cryoelectron microscopy single-particle reconstruction,with many cryo-electron microscopy techniques first established for structural studies of icosahedral viruses,owing to their high symmetry and large mass.This review summarizes the computational methods for icosahedral and symmetry-mismatch reconstruction of viruses,as well as the likely challenges and bottlenecks in virus reconstruction,such as symmetry mismatch reconstruction,contrast transformation function(CTF)correction,and particle distortion. 展开更多
关键词 cryo-electron microscopy icosahedral virus computational method three-dimensional reconstruction symmetry-mismatch reconstruction
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Methods,Algorithms,Codes,and Software for Theoretical and Computational Chemistry 认领 引用
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作者 Bin Jiang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第3期301-302,共2页
Theoretical and computational chemistry has profoundly impacted a wide range of disciplines,from chemistry and physics to biology and materials science.In recent years,remarkable advances in electronic structure theor... Theoretical and computational chemistry has profoundly impacted a wide range of disciplines,from chemistry and physics to biology and materials science.In recent years,remarkable advances in electronic structure theory,molecular dynamics,and machine learning methods——coupled with increasingly powerful algorithms and software—have equipped chemists with an unprecedented arsenal of tools to tackle complex chemical problems. 展开更多
关键词 theoretical computational chemistry electronic structure theorymolecular dynamicsand algorithms codes software methods materials sciencein theoretical chemistry
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A novel paradigm for solving PDEs:multi-scale neural computing 认领 引用
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作者 Wei Suo Weiwei Zhang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第6期76-92,共17页
Numerical simulation is dominant in solving partial differential equations(PDEs),but balancing fine-grained grids with low computational costs is challenging.Recently,solving PDEs with neural networks(NNs)has gained i... Numerical simulation is dominant in solving partial differential equations(PDEs),but balancing fine-grained grids with low computational costs is challenging.Recently,solving PDEs with neural networks(NNs)has gained interest,yet cost-effectiveness and high accuracy remain a challenge.This work introduces a novel paradigm for solving PDEs,called multi-scale neural computing(MSNC),considering spectral bias of NNs and local approximation properties in the finite difference method(FDM).The MSNC decomposes the solution with a NN for efficient capture of global scale and the FDM for detailed description of local scale,aiming to balance costs and accuracy.Demonstrated advantages include higher accuracy(10 times for 1D PDEs,20 times for 2D PDEs)and lower costs(4 times for 1D PDEs,16 times for 2D PDEs)than the standard FDM.The MSNC also exhibits stable convergence and rigorous boundary condition satisfaction,showcasing the potential for hybrid of NN and numerical method. 展开更多
关键词 Neural computing Partial differential equations Hybrid strategy Numerical methods Neural networks
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A quantum lattice Boltzmann method for solving the Navier-Stokes systems with a linearized non-equilibrium collision operator and modular circuit 认领 引用
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作者 Kang-Yang Zeng Zhao-Dong Wei +3 位作者 Xiao-Dong Niu Adnan Khan De-Cai Li Hiroshi Yamaguchi 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期110-119,共10页
This paper introduces a quantum lattice Boltzmann method for simulating complex flows.The proposed quantum scheme effectively overcomes the mismatch between the nonlinear collision in the standard lattice Boltzmann me... This paper introduces a quantum lattice Boltzmann method for simulating complex flows.The proposed quantum scheme effectively overcomes the mismatch between the nonlinear collision in the standard lattice Boltzmann method(LBM)and the linear quantum computing(QC)through a linearized non-equilibrium collision operator,and is successfully extended to the Navier-Stokes systems by designing a modular circuit for density and velocity calculations.Most importantly,the present approach ensures the unitary of quantum algorithms while keeping the collision relaxation parameter adjustable for simulating flows with different Reynolds numbers.The accuracy and practicality of the proposed method are demonstrated by simulating two typical flows,including lid-driven and natural convection flows in a square cavity at different Reynolds and Rayleigh numbers,respectively.This work offers a practical application of QC-based LBM for complex fluid dynamics problems. 展开更多
关键词 Lattice Boltzmann method Quantum computing Modular circuits
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A multi-body separation simulation method incorporating a high-efficiency and high-precision collision model 认领 引用
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作者 Jiaxuan YE Wei TIAN +3 位作者 Shuling TIAN Yunfei MIAO Jiaming ZHANG Jinjun DUAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第4期100-117,共18页
Multi-body separation involving collisions is common in aerospace engineering.The ability to analyze the dynamics of multi-body collisions is rarely possessed by traditional Multi-Body Separation Simulation(MBSS)metho... Multi-body separation involving collisions is common in aerospace engineering.The ability to analyze the dynamics of multi-body collisions is rarely possessed by traditional Multi-Body Separation Simulation(MBSS)methods.To methodically address this challenging issue,a research study is conducted herein based on the MBSS in conjunction with an efficient and high-accuracy collision model.First,an MBSS based on the dynamic unstructured overset grid method is performed by solving the unsteady compressible Reynolds-averaged Navier-Stokes equations with the six-degree-offreedom rigid-body motion.Second,to detect object collisions and calculate collision factors with high accuracy and efficiency,a collision detection approach and a nearest distance calculation based methodology on the basis of computational fluid dynamics data structures and bounding volume hierarchies are originally proposed.Third,a transient multiple collision model is established to simulate an unlimited number of object collisions within a single time step.Finally,collision simulation experiments with balls and those of the space shuttle's collision with foreign objects are conducted to verify the accuracy,efficiency,and robustness of the newly developed approach. 展开更多
关键词 Collision detection Dynamic grid method Multi-body collision Multi-body separation Unsteady computational fluid dynamics
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AI Model Compression Methods: A Distribution-Aware Residual Entropy Quantization 认领 引用
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作者 Nikita Sakovich Dmitry Aksenov +1 位作者 Ekaterina Pleshakova Sergey Gataullin 《Computers, Materials & Continua》 SCIE EI 2026年第8期854-864,共11页
We introduce the DARE-Q(Distribution-Aware Residual Entropy Quantization)method—a post-training quantization method for neural network weights designed to reduce bit-width with minimal degradation of model quality.Un... We introduce the DARE-Q(Distribution-Aware Residual Entropy Quantization)method—a post-training quantization method for neural network weights designed to reduce bit-width with minimal degradation of model quality.Unlike traditional approaches that solely optimize the mean squared error of weight approximation,DARE-Q additionally considers the entropy of the quantization residual,allowing for control over the statistical properties of the resulting error.The method is based on channel-wise symmetric uniform quantization with scaling based on a combined loss function that includes L2 distortion and entropy regularization.The DARE-Q method is implemented as a compact DAREQuantLinear module which can be easily integrated into standard transformer pipelines without changing the inference logic or using specific kernels.The experimental analysis was conducted on the language models facebook/opt-125m and facebook/opt-350m,which contain approximately 125 and 350 million parameters.The quality of the models was assessed using the standard perplexity metric(PPL)computed on the wikitext-2-raw-v1 dataset.DARE-Q is completely data-free and does not require model retraining or calibration data,which makes it the only viable option in privacy-sensitive or confidential environments where access to the original training data is restricted—precisely the setting where methods such as GPTQ and AWQ cannot be applied.The observed increase in PPL relative to data-dependent baselines reflects this fundamental trade-off rather than a shortcoming of the approach.By leveraging per-channel scale selection and a combined loss function,DARE-Q provides a flexible trade-off between approximation accuracy and quantization error structure,creating an attractive algorithmic basis for further improvement of model compression methods. 展开更多
关键词 Artificial intelligence large language models mathematical optimization methods model compression quantization methods information theory high-performance computing
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Correction:High-frequency emphasized neural network reconstruction method for in situ synchrotron radiation ultrafast computed tomography characterization 认领 引用
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作者 Jing‑Wei Li Yu Xiao +3 位作者 Yong‑Cun Li Xiao‑Fang Hu Guo‑Hao Du Feng Xu 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第6期271-271,共1页
Correction to:Nuclear Science and Techniques(2026)37:45 http://gffzzd3cc09b8251d45dfsucww9nv5wunw66x6.ffgz.tsg.suse.edu.cn/10.1007/s41365-025-01860-8.In this article,Feng Xu should also have been denoted as a co-corresponding author.The original article has been corre... Correction to:Nuclear Science and Techniques(2026)37:45 http://gffzzd3cc09b8251d45dfsucww9nv5wunw66x6.ffgz.tsg.suse.edu.cn/10.1007/s41365-025-01860-8.In this article,Feng Xu should also have been denoted as a co-corresponding author.The original article has been corrected. 展开更多
关键词 situ synchrotron radiation nuclear science techniques ultrafast computed tomography characterization high frequency emphasized neural network reconstruction method
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SCS模型在大中型无资料流域洪水计算中的尺度适应性研究 认领 引用
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作者 姚士茜 徐郡璘 戴俣俣 《水力发电》 CAS 2026年第2期31-34,75,共4页
针对传统SCS模型主要适用于小流域的局限,首次系统评估了其在大中型无资料流域的设计洪水计算效能。以印尼TF坝址流域(面积>1000 km2)为案例,整合多源数据(实测河道断面、30 m分辨率DEM、HWSD土壤数据库、土地利用图、雨量站与MS... 针对传统SCS模型主要适用于小流域的局限,首次系统评估了其在大中型无资料流域的设计洪水计算效能。以印尼TF坝址流域(面积>1000 km2)为案例,整合多源数据(实测河道断面、30 m分辨率DEM、HWSD土壤数据库、土地利用图、雨量站与MSWEP融合降水产品),构建SCS产汇流模型。创新性地采用速度法推求滞时(Lag time),解决了传统坡度法在大中型流域的空间尺度局限性问题。2024年7月历史洪水调查显示,基于洪痕推求的坝址洪峰流量3700 m3/s(调查显示)与模型计算的20~30 a一遇设计洪水高度吻合(误差<5%)。研究成果表明:SCS模型通过多源数据驱动,可有效突破无资料限制,为大中型流域提供洪水计算新途径;速度法显著提升了汇流参数的空间适应性,洪峰模拟误差控制在5%以内。该成果为资料匮乏区的防洪工程设计提供了机理明确、可操作性强的解决方案。 展开更多
关键词 SCS模型 滞时 资料缺乏流域 设计洪水 速度法
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基于SCS-CN水文模型的山地海绵城市传统理水效果研究 认领 引用
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作者 翁嘉悦 白直旭 李铭珂 《陕西水利》 2026年第7期4-6,11,共3页
针对山地城市易涝特点,以温州市鹿城区藤桥镇雅漾村为例,提出“分级滞洪+动态调控”传统理水方法。基于SCS-CN水文模型构建实验区模型,模拟不同降雨情景下易涝区的洪峰流量。定量评估可调高度移动挡水板的防洪排涝效果,对比调控前后洪... 针对山地城市易涝特点,以温州市鹿城区藤桥镇雅漾村为例,提出“分级滞洪+动态调控”传统理水方法。基于SCS-CN水文模型构建实验区模型,模拟不同降雨情景下易涝区的洪峰流量。定量评估可调高度移动挡水板的防洪排涝效果,对比调控前后洪水重现期。结果表明,该措施能有效降低淹没强度与范围,提高雨水渗透滞蓄能力。通过灵活调节挡水板高度,实现低成本简易地防洪排涝,可为推进山地海绵城市建设提供理论依据与实践指导。 展开更多
关键词 移动式挡水板 SCS-CN水文模型 传统理水方法 山地海绵城市
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Extended multiscale finite element method for mechanical analysis of heterogeneous materials 认领 引用 被引量：9
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作者 Hong-Wu Zhang Jing-Kai Wu +1 位作者 Jun Lv Zhen-Dong Fu 《Acta Mechanica Sinica》 SCIE EI CAS 2010年第6期899-920,共22页
An extended multiscale finite element method(EMsFEM)is developed for solving the mechanical problems of heterogeneous materials in elasticity.The underlying idea of the method is to construct numerically the multiscal... An extended multiscale finite element method(EMsFEM)is developed for solving the mechanical problems of heterogeneous materials in elasticity.The underlying idea of the method is to construct numerically the multiscale base functions to capture the small-scale features of the coarse elements in the multiscale finite element analysis.On the basis of our existing work for periodic truss materials,the construction methods of the base functions for continuum heterogeneous materials are systematically introduced.Numerical experiments show that the choice of boundary conditions for the construction of the base functions has a big influence on the accuracy of the multiscale solutions,thus,different kinds of boundary conditions are proposed.The efficiency and accuracy of the developed method are validated and the results with different boundary conditions are verified through extensive numerical examples with both periodic and random heterogeneous micro-structures.Also,a consistency test of the method is performed numerically.The results show that the EMsFEM can effectively obtain the macro response of the heterogeneous structures as well as the response in micro-scale,especially under the periodic boundary conditions. 展开更多
关键词 Extended multiscale finite element method Heterogeneous material Base function Downscaling computation
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Multi-domain Spectral Immersed Interface Method for Solving Elliptic Equation with a Global Description of Discontinuous Functions 认领 引用 被引量：1
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作者 JIANG Yongsong LIANG An +1 位作者 SUN Xiaofeng JING Xiaodong 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2012年第3期297-310,共14页
This paper presents the extension of the global description approach of a discontinuous function, which is proposed in the previous paper, to a spectral domain decomposition method. This multi-domain spectral immersed... This paper presents the extension of the global description approach of a discontinuous function, which is proposed in the previous paper, to a spectral domain decomposition method. This multi-domain spectral immersed interlace method（IIM） divides the whole computation domain into the smooth and discontinuous parts. Fewer points on the smooth domains are used via taking advantage of the high accuracy property of the spectral method, but more points on the discontinuous domains are employed to enhance the resolution of the calculation. Two that the domain decomposition technique can placed around the discontinuity. The present reached, in spite of the enlarged computational discontinuous problems are tested to verify the present method. The results show reduce the error of the spectral IIM, especially when more collocation points are method is t：avorable for the reason that the same level of the accuracy can be domain. 展开更多
关键词 computational aerodynamics immersed interface method immersed boundary method Chebyshev spectral method domain decomposition method
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Discrete particle methods for engineering simulation:Reproducing mesoscale structures in multiphase systems 认领 引用 被引量：4
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作者 Ji Xu Peng Zhao +2 位作者 Yong Zhang Junwu Wang Wei Ge 《Resources Chemicals and Materials》 2022年第1期69-79,共11页
Most natural resources are processed as particle-fluid multiphase systems in chemical,mineral and material indus-tries,therefore,discrete particles methods(DPM)are reasonable choices of simulation method for engineeri... Most natural resources are processed as particle-fluid multiphase systems in chemical,mineral and material indus-tries,therefore,discrete particles methods(DPM)are reasonable choices of simulation method for engineering the relevant processes and equipments.However,direct application of these methods is challenged by the complex multiscale behavior of such systems,which leads to enormous computational cost or otherwise qualitatively inac-curate description of the mesoscale structures.The coarse-grained DPM based on the energy-minimization multi-scale(EMMS)model,or EMMS-DPM,was proposed to reduce the computational cost by several orders while main-taining an accurate description of the mesoscale structures,which paves the way for its engineering applications.Further empowered by the high-efficiency multi-scale DEM software DEMms and the corresponding customized heterogeneous supercomputing facilities with graphics processing units(GPUs),it may even approach realtime simulation of industrial reactors.This short review will introduce the principle of DPM,in particular,EMMS-DPM,and the recent developments in modeling,numerical implementation and application of large-scale DPM which aims to reach industrial scale on one hand and resolves mesoscale structures critical to reaction-transport coupling on the other hand.This review finally prospects on the future developments of DPM in this direction. 展开更多
关键词 Coarse-graining Discrete element method(DEM) EMMS-DPM(EMMS-based discrete particle method) GPU-CPU heterogeneous computing Mesoscale
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NUMERICAL SIMULATION OF UNSTEADY-STATE UNDEREXPANDED JET USING DISCONTINUOUS GALERKIN FINITE ELEMENT METHOD 认领 引用 被引量：3
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作者 陈二云 李志刚 +3 位作者 马大为 乐贵高 赵改平 任杰 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2008年第2期89-93,共5页
A discontinuous Galerkin finite element method （DG-FEM） is developed for solving the axisymmetric Euler equations based on two-dimensional conservation laws. The method is used to simulate the unsteady-state underex... A discontinuous Galerkin finite element method （DG-FEM） is developed for solving the axisymmetric Euler equations based on two-dimensional conservation laws. The method is used to simulate the unsteady-state underexpanded axisymmetric jet. Several flow property distributions along the jet axis, including density, pres- sure and Mach number are obtained and the qualitative flowfield structures of interest are well captured using the proposed method, including shock waves, slipstreams, traveling vortex ring and multiple Mach disks. Two Mach disk locations agree well with computational and experimental measurement results. It indicates that the method is robust and efficient for solving the unsteady-state underexpanded axisymmetric jet. 展开更多
关键词 jets computational fluid dynamics multiple Mach disks vortex ring discontinuous Galerkin finite element method
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