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A GPU-accelerated two-phase flow model for fluid-solid interaction using the sharp interface immersed boundary method

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JOURNAL OF HYDRODYNAMICS 2024年第5期36卷 883-897页

作者： Ma, Li-ping Lian, Ji-jian Liu, dong-ming Tianjin Univ State Key Lab Hydraul Engn Intelligent Construct & Tianjin 300072 Peoples R China Tianjin Univ Sch Civil Engn Tianjin 300072 Peoples R China Sichuan Univ State Key Lab Hydraul & Mt River Engn Chengdu 610065 Peoples R China

A two-phase flow model accelerated by graphical processing unit (GPU) is developed to solve fluid-solid interaction (FSI) using the sharp-interface immersed boundary method (IBM). This model solves the incompressible Navier-Stokes equations using the projection-based fractional step method in a fixed staggered Cartesian grid system. A volume of fluid (VOF) method with second-order accuracy is employed to trace the free surface. To represent the intricate surface geometry, the structure is discretized using the unstructured triangle mesh. Additionally, a ray tracing method is employed to classify fluid and solid points. A high-order stable scheme has been introduced to reconstruct the local velocity at interface points. Three FSI problems, including wave evolution around a breakwater, interaction between a periodic wave train and a moving float, and a 3-D moving object interacting with the free surface, were investigated to validate the accuracy and stability of the proposed model. The numerical results are in good agreement with the experimental data. Additionally, we evaluated the computational performance of the proposed GPU-based model. The GPU-based model achieved a 42.29 times speedup compared with the single-core CPU-based model in the three-dimension test. Additionally, the results regarding the time cost of each code section indicate that achieving more significant acceleration is associated with solving the turbulence, advection, and diffusion terms, while solving the pressure Poisson equation (PPE) saves the most time. Furthermore, the impact of grid number on computational efficiency indicates that as the number of grids increases, the GPU-based model outperforms the multi-core CPU-based model.

关键词： Fluid-solid interaction (FSI) immersed boundary method (IBM) graphical processing unit (GPU) two-phase flow moving rigid body

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Receptivity of Mack modes to localized unsteady blowing and suction in a chemical non-equilibrium hypersonic boundary layer

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Acta Mechanica Sinica 2024年第7期40卷 1-18页

作者： Qingjiang Yuan Runjie Song ming dong State Key laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China

This paper studies the local receptivity of the Mack-mode instability to localized unsteady blowing and suction(UBS)in a chem-ical non-equilibrium(CNE)hypersonic boundary *** five-species CNE model is employed,and the receptivity efficiency is formulated by use of the residual *** with the results for the calorically perfect gas(CPG)model,we find that the real-gas effect enhances the receptivity efficiency remarkably in the majority of the second-mode frequency band,and the enhancement is mainly attributed to the modification of the base flow due to the CNE effect,which is akin to the cold-wall effect in hypersonic boundary *** with the destabilizing role of the CNE effect on the Mack second mode,it is concluded that the CNE effect would lead to a greater linearly accumulated perturbation amplitude,implying premature of transition to turbulence in a high-enthalpy hypersonic boundary layer subject to localized perturbations.

关键词： Chemical non-equilibrium flow Boundary-layer instability Hypersonic Receptivity Transition to turbulence

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Modeling turbulent heat fluxes over Arctic sea ice using a maximum-entropy-production approach

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Advances in Climate Change Research 2021年第4期12卷 517-526页

作者： ZHANG Yi-ming SONG Mi-Rong dong Chang-ming LIU Ji-Ping School of Marine Science Nanjing University of Information Science and TechnologyNanjing210044China LASG Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519000China Department of Atmospheric and Environmental Sciences University at AlbanyState University of New YorkAlbanyNY12222USA

Recently,an algorithm of surface turbulent heat fluxes over snow/sea ice has been developed based on the theory of maximum entropy production(MEP),which is fundamentally different from the bulk flux algorithm(BF)that has been used in sea ice models for a few *** this study,we first assess how well the MEP algorithm captures the observed variations of turbulent heat fluxes over Arctic sea *** is found that the calculated heat fluxes by the MEP method are in good agreement with in-situ observations after considering the absorption of incoming radiation in a snow/ice surface layer with infinitesimal *** then investigate the effects of two different schemes(MEP ***)in the sea ice model of CICE6 on simulated turbulent heat fluxes and sea ice processes in the Arctic *** results show that the two different schemes give quite different representations of seasonal variations of heat fluxes,particularly for sensible heat fluxes in *** heat fluxes simulated by the MEP produce weak cooling effect on the ice surface in summer,whereas the BF generates a warming *** a result,compared to the BF,the MEP leads to a reduced seasonal cycle of Arctic sea ice mass flux by modulating snow-to-ice conversion,basal ice growth,surface ice melt and basal ice melt.

关键词： Sea ice modeling Turbulent heat fluxes Maximum-entropy-production Mass flux

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Distinguishing Computer-Generated Images from Natural Images Using Channel and Pixel Correlation

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Journal of Computer Science & Technology 2020年第3期35卷 592-602页

作者： Rui-Song Zhang Wei-Ze Quan Lu-Bin Fan Li-ming Hu dong-ming Yan National Laboratory of Pattern Recognition Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China Alibaba Group Hangzhou 310023China State Key Laboratory of Hydro-Science and Engineering Tsinghua UniversityBeijing 100084China

With the recent tremendous advances of computer graphics rendering and image editing technologies,computergenerated fake images,which in general do not reflect what happens in the reality,can now easily deceive the inspection of human visual *** this work,we propose a convolutional neural network(CNN)-based model to distinguish computergenerated(CG)images from natural images(NIs)with channel and pixel *** key component of the proposed CNN architecture is a self-coding module that takes the color images as input to extract the correlation between color channels *** previous approaches that directly apply CNN to solve this problem,we consider the generality of the network(or subnetwork),i.e.,the newly introduced hybrid correlation module can be directly combined with existing CNN models for enhancing the discrimination capacity of original *** results demonstrate that the proposed network outperforms state-of-the-art methods in terms of classification *** also show that the newly introduced hybrid correlation module can improve the classification accuracy of different CNN architectures.

关键词： natural image computer-generated image channel and pixel correlation convolutional neural network

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Properties ofπ-skew Graphs with Applications

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Acta Mathematica Sinica,English Series 2021年第4期37卷 641-656页

作者： Zhang dong OUYANG Feng ming dong Rui Xue ZHANG Eng Guan TAY School of Mathematics and Computational Sciences Hu’nan First Normal UniversityChangsha 410205P.R.China Mathematics and Mathematics Education National Institute of EducationNanyang Technological University637616Singapore

The skewness of a graph G,denoted by sk(G),is the minimum number of edges in G whose removal results in a planar *** is an important parameter that measures how close a graph is to planarity,and it is complementary,and computationally equivalent,to the Maximum Planar Subgraph *** any connected graph G on p vertices and q edges with girth g,one can easily verify that sk(G)≥π(G),whereπ(G)=[q−g/g−2(p−2)],and the graph G is said to beπ-skew if equality *** concept ofπ-skew was first proposed by *** and ***π-skew graphs with girth 3 are precisely the graphs that contain a triangulation as a spanning *** purpose of this paper is to explore the properties ofπ-skew *** families ofπ-skew graphs are obtained by applying these properties,including join of two graphs,complete multipartite graphs and Cartesian product of two *** also discuss the threshold for the existence of a spanning *** other results some sufficient conditions regarding the regularity and size of a graph,which ensure a spanning triangulation,are given.

关键词： Skewness of graph crossing number of graph Cartesian product join product π-skew

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Scheme for Realizing Probabilistic Teleportation of Bipartite Atomic State via Cavity QED

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Communications in Theoretical Physics 2006年第4期45卷 621-624页

作者： dong Ping YANG ming CAO Zhuo-Liang School of Physics ＆ Material Science Anhui University Hefei 230039 China

We present a physical scheme for realizing probabilistic teleportation of bipartite atomic states via cavity QED. This scheme requires only a nonmaximally entangled pair used as quantum channel, so we reduce the requi... 详细信息

关键词： bipartite atomic state teleportation nonmaximally entangled state cavity QED

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Minimizing makespan in a two-stage hybrid flow shop scheduling problem with open shop in one stage

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Applied Mathematics(A Journal of Chinese Universities) 2013年第3期28卷 358-368页

作者： dong Jian-ming HU Jue-liang CHEN Yong Department of Mathematics Zhejiang Sci-Tech University Institute of Operational Research and Cybernetics Hangzhou Dianzi University

This paper considers a scheduling problem in two-stage hybrid flow shop, where the first stage consists of two machines formed an open shop and the other stage has only one machine. The objective is to minimize the makespan, i.e., the maximum completion time of all jobs. We first show the problem is NP-hard in the strong sense, then we present two heuristics to solve the problem. Computational experiments show that the combined algorithm of the two heuristics performs well on randomly generated problem instances.

关键词： hybrid flow shop open shop Heuristic algorithm.

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Hot Stamping Parameters Optimization of Boron Steel Using a Response Surface Methodology Based on Central Composite Design

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Journal of Iron and Steel Research International 2015年第6期22卷 519-526页

作者： ming-dong HUANG Bao-yu WANG Jing ZHOU School of Mechanical Engineering University of Science and Technology Beijing

The effect of hot stamping parameters on the mechanical properties of 22MnB5 steel sheet with thickness of 1.1 mm is studied. The considered parameters are austenization temperature （800- 1 000 ℃ ）, austenitizing soa king time （60-540 s）, initial deformation temperature （560-800 C） and tool temperature （20-220 ℃）. In order to obtain hot stamped parts with optimal mechanical properties, response surface methodology based on the central composite design has been employed to design the experiment matrix. Tensile strength of hot stamped parts is deter- mined as the relation in the mathematical model. The optimal condition and objective effects of parameters are deter mined via this relation. The statistical analysis showed that all four factors significantly affect the tensile strength of the hot stamped parts. The optimum austenization temperature is found to be 918.89 ℃ with the austenitizing soa- king time, initial deformation temperature and tool temperature of 279.45 s, 684.69 C and 21.85 ℃, respectively. These optimal hot stamping parameters prove to have high tensile strength （1 631.84 MPa） where deviation between predicted and actual response falls within 2 %.

关键词： hot stamping advanced high strength steel response surface method optimization

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Synthesis and characterization of new soluble poly(aryl ether nitrile)s containing phthalazinone moiety

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Chinese Chemical Letters 2007年第5期18卷 595-597页

作者： ming Jing Wang Cheng Liu Li ming dong Xi Gao Jian Department of Polymer Science ＆ Materials Dalian University of Technology Dalian 116012 China

A series of novel poly（aryl ether nitrile）s containing phthalazinone moiety were synthesized by the nucleophilic displacement reaction of bisphenol-like monomers （I） with 2,6-difluorobenzonitrile. The inherent viscosities ranged from 0.46 to 1.07 dL g^-1. The glass transition temperatures were in the range of 277-295℃, and the temperatures for 10% weight loss in nitrogen atmosphere were found between 495 and 527 ℃. The structures of these resultant polymers were confirmed by FT-IR and 1^H NMR. Moreover, the properties of poly（aryl ether nitrile）s including solubility and crystallinity were also studied.

关键词： Poly(aryl ether nitrile)s Phthalazinone Heat-resistance Solubility

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Influence of excavation schemes on slope stability: A DEM study

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Journal of Mountain Science 2020年第6期17卷 1509-1522页

作者： WANG Zhen-yu GU dong-ming ZHANG Wen-gang Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China School of Civil Engineering Chongqing UniversityChongqing 400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing 400045China

Slope failure due to improper excavation is one of common engineering disasters in *** explore the failure mechanism of soil slope induced by toe excavation,especially to investigate the influence of excavation unloading path and rate on slope stability,a numerical slope model was built via particle flow code PFC2 *** development of crack and strain during excavation were obtained and used to evaluate the deformation ***,excavation types representing different unloading paths and rates were compared in terms of crack number and strain *** indicate that crack number and strain level induced by horizontal column excavation are much greater than those of vertical column excavation and oblique *** crack number and strain level increase with excavation unloading ***,the feasibility of taking the average strain of slope surface and the average value of maximum strain along monitoring lines to represent the global deformation characteristics were *** study can provide a theoretical guidance for slope monitoring and preliminary optimal selection of excavation scheme in the design and construction of slope engineering.

关键词： Slope toe excavation Unloading path Unloading rate Strain distribution Slope stability Discrete element method

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