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Extreme-scale parallel computing: bottlenecks and strategies None
Ze-yao MO
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 10, Pages 1251-1260 doi: 10.1631/FITEE.1800421
Extreme-scale numerical simulations seriously demand extreme parallel computing capabilities. To address the challenges of these capabilities toward exascale, we systematically analyze the major bottlenecks of parallel computing research from three perspectives: computational scale, computing efficiency, and programming productivity. For these bottlenecks, we propose a series of urgent key issues and coping strategies. This study will be useful in synchronizing development between the numerical computing capability and supercomputer peak performance.
Keywords： Extreme scale Numerical simulation Parallel computing Supercomputers
Numerical Computational Aerodynamics Coefficient for Eje ction Seat
Yu Jia,Lin Guiping
Strategic Study of CAE 2007, Volume 9, Issue 6, Pages 53-57
The traditional method for obtaining aerodynamics coefficient for ejection seat is wind tunnel experiment. To research the feasibility of the application of computational aerodynamics coefficient for ejection seat on general CFD software, aerodynamics coefficient of ejection seat was computed using general CFD software. Through resolving fluid field, the result is obtained. The average difference of the result compared with the experiment data is less than 10 % and in the range of permission. It shows that CFD methodologies can be used instead of wind tunnel experiment for the ejection seat research. CFD methodologies can be applied widely to ejection seat research.
Keywords： ejection seat escape system computational fluid dynamics aerodynamic coefficient
Several hot spots in engineering computing visualization
Zheng Peng,He Tiening
Strategic Study of CAE 2009, Volume 11, Issue 9, Pages 44-47
Visualization technique confronts great challenges raised by large-scale and comprehensive engineering numerical simulation. Key research problems such as visualization expression, algorithm optimization and integrated solving framework are paid more attention to, current developments in and outside China are introduced and discussed. It is concluded that communication with application fields should be attached more importance to development of visualization technique.
Keywords： engineering computing engineering numerical simulation visualization
Numerical analysis for castedinplace DX pile groups
Wan Fei,Zhang Dehua
Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 46-50
DX pile group is simulated by numerical analysis software FLAC3D to study the mechanics behavior and the pilesoil settlement rules. Analysis of the influence of pile spacing and plate arrangement to ultimate bearing capacity and settlement control, and comparison of the ultimate bearing capacity of straight pile group with 8 piles with the DX pile group with 6 piles are done. The result indicates that the pile of DX pile group has the same bearing mechanism with the DX single pile. The displacement of the soil below the bearing plate is greater than that above the bearing plate, which leads to the free surface of the upper cavity. 3D (D is the diameter of the bell) pile spacing can perform the best bearing capacity and settlement control. Within the same stratum, bell arrangement (staggered arrangement and parallel arrangement) has little effect to the bearing capacity of DX pile group. The ultimate bearing capacity of DX pile group with 6 piles is as 1.27 times as the straight pile group with 8 piles. With DX pile group, we can not only effectively control the settlement, but also reduce the number of piles and save the project cost. These research results provide valuable basis for the rational design of pile groups of this type.
Keywords： pile foundation ultimate bearing mechanism numerical analysis DX pile group
Fast emergency control strategy calculation based on dynamic equivalence and integral sensitivity Research Articles
Yi-fan GAO, Jian-quan WANG, Tan-nan XIAO, Dao-zhuo JIANG
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 8, Pages 1119-1132 doi: 10.1631/FITEE.1700389
Keywords： Emergency control Transient stability Numerical integration Dynamic equivalence Integral sensitivity
Finite Element Numerical Model on Break and Collapse Process of Frame Building by Blasting
Zhang Qi,Wu Feng,Wang Xiaolin
Strategic Study of CAE 2005, Volume 7, Issue 10, Pages 28-32
Demolishing of frame building by blast is complex and difficult. Based on mechanics process of demolishing blast of frame building, the numerical compute model on breaking of the frame building is set up in the paper. By this numerical compute way, the design projects of demolishing blasting of the frame can be simulated and the design parameters can be optimized. Through the simulation, the wastes of boreholes, explosive charges and safety protection material can be avoided. Sometimes the frame building does not collapse in the process of the demolishing blasting because the design project is not correct by experience. The situation of every member of the frame in the demolishing blasting can be computed by the present simulation way and the collapsing of the frame after blasting can be ascerlained. The numerical model offers a new design way for demolishing blast of frame building.
Keywords： engineering blast frame building finite element numerical compute
Simulation on Flow Field Characteristic of Restricted Wall-attached Jet in Heading Face
Wang Haiqiao,Liu Ronghua,Chen Shiqiang
Strategic Study of CAE 2004, Volume 6, Issue 8, Pages 45-49
Pressed ventilation in heading face is actually a restrained wall-attached jet ventilation in confined space. In this paper, based on hydrcxlynamic and jet theory, the turbulence k-ε model of restrained wall-attached jet ventilation in heading face is set up and calculation boundary is analyzed. Combining with practice, and using PHOENICS3. 4 software of computational fluid dynamics (CFD), three - dimensional airflow field of the jet ventilation in heading face is simulated. The flow field characteristics such as the flow field zoning, the starting segment of jet, the attaching course of jet and the changing pattern of jet velocity are obtained by numerical simulation. According to result of numerical simulation, there are four zones in heading face, i. e. wall-attached jet zone, impact jet wall-attached zone, back flow zone and eddy zone. The starting segment length of attached jet is shorter than thar of free attached jet. After wall-attached jet formed completely, the axis velocity of wall is higher than that in air outlet. The result of numerical simulation agrees with that of experiment, which provides a dependable basis for further study of the air mass transport process, the reason of methane accumulation and the efficiency of air displacement in heading face.
Keywords： heading face restricted wall-attached jet k - ε model numerical simulation
Differential evolution based computation intelligence solver for elliptic partial differential equations Research Article
Muhammad Faisal Fateh, Aneela Zameer, Sikander M. Mirza, Nasir M. Mirza, Muhammad Saeed Aslam, Muhammad Asif Zahoor Raja,muhammad.aslam@adelaide.edu.au
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10, Pages 1445-1456 doi: 10.1631/FITEE.1900221
Keywords： 差分进化；边界值问题；偏微分方程；有限差分法；数值计算
High-precision Numerical Computation of High-degree Gauss quadrature Nodes
Zhang Qingli,Wang Xiaomei,Yin Shaotang,Jiang Haihe
Strategic Study of CAE 2008, Volume 10, Issue 2, Pages 35-40
Gauss quadrature is used widely in many fields such as the engineering numerical computation, X-ray diffraction profile analysis, spectroscopy,and so on. The nodes and weight factors of Gauss-quadrature are essential data to the numerical integration. A method to compute the zeroes of the high-degree Legendre, Laguerre and Hermite polynomials, which are the nodes of Gauss-Legendre, Gauss-Laguerre and Gauss-Hermite Quadrature, respectively, is studied, and a very efficient algorithm scan-iteration method(SIM) is given. According to the properties of Legendre, Laguerre and Hermite polynomials, their definitions are modified a little, and the stable recursive relations to compute their value are obtained. To extract these polynomials, their root intervals are searched with a certain step within a certain range. After the intervals of all roots are obtained, the roots with the desired precision can be gotten by the general iteration methods such as secant or bisection method. Numerical experiments indicate that the method is very efficient and the high-precise roots of Legendre, Laguerre and Hermite polynomials can be extracted.
Keywords： Gauss quadrature Legendre polynomial Laguerre polynomial Hermite polynomial extract roots
Wu Xiugang,Shen Yongming,Zheng Yonghong,Yang Zhifeng
Strategic Study of CAE 2003, Volume 5, Issue 2, Pages 57-61
Based on depth-averaged mathematic model of flow and pollutant transportation in non-orthogonal curvilinear coordinates, the k-ε double equations´ turbulence model and the coupling arithmetic of velocity-water depth are adopted, which are applied to the numerical simulation of the flow and the contamination diffusion-transportation. The flow field and concentration of discharge both along bank and in the centerline of the meandering channel in laboratory are calculated, and the calculating results accord well with the measured data.
Keywords： curvilinear coordinates meandering channel diffusion-transportation IMPLEC algorithm concentration field
Numerical Study on the Parabolic Mild-slope Equation
Shen Yongming,Zheng Yonghong,Wu Xiuguang
Strategic Study of CAE 2004, Volume 6, Issue 3, Pages 30-35
Two kinds of parabolic mild-slope equations are studied systematically. By numerical modeling wave transformation over four typical topographies, the accuracy of numerical schemes, the effect of grid number on the solution accuracy, the sensitiveness of the models to the incident wave angle and the effect of weakly nonlinear terms on the numerical results are discussed in detail. These results can give some theoretical guidance to the applications of parabolic mild slope equations to wave propagation over complex topography in large coastal areas.
Keywords： parabolic mild-slope equation numerical study wave
Liu Zegong,Yuan Liang,Dai Guanglong,Shi Biming,Lu Ping,Tu Min
Strategic Study of CAE 2004, Volume 6, Issue 5, Pages 32-38
Gas in working faces is mainly produced in the destressing and desorption process of the coal bed, gobs and adjacent strata. The coal beds are too soft to carry out bedding drilling and draw gas effectively. If gob gas suction is adopted in a large area,the project will prove not only extremely difficult,but also fail to draw out gas of high concentration. Therefore, efficient gas suction is technically determined by seeking fracture aisles for gas movement and gas zone of enrichment. In the course of mining and destressing, gas originating from large destressing areas will go through the fracture aisles of the full development areas and gather in annular fracture areas. The similar material experiments in the laboratory, the numerical simulation and the in-situ study are applied in this work in order to find the location of annular fracture areas in overlying formation. The long-drill mehtod for gas suction along the strike of annular fracture areas is adopted. Mining in coal beds with gas of high conentration and low permeability and gas suction can be operatod separately. During mining activities in the working faces,gas released from roof fracture areas will not flow into upper corners, so the technically drilling problem in soft coal beds with low permeability and high concentration gas can be solved. The application of this technology in the working faces of the gassy mines in Huainan shows that gas suction rate is above 60 percent, making it possible to mine safely,efficiently and intensively.
Keywords： coal seam similar material experiment numerical simulation gas drainage annular fracture area
Study on load bearing characteristic of cast in situ DX group pile with numerical analysis
Zhang Qinglin,Chen Lihong
Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 51-59
This paper analyzes 4 types of group-pile which contains 4 piles with spacing 1.5D, 2D, 2.5D and 3D（D is diameter of the bearing plate）by numerical analysis, and draws some conclusions. The main conclusions are: group pile effect of DX pile increases sharply when pile spacing decreases；the bearing capacity of 3D spacing group-pile is 1.32 times larger than that of 1.5D spacing group-pile；effect coefficient of group-pile increases from 0.59 to 0.78 when spacing increases from 1.5D to 3D；the maximum value of settlement of soil among group-pile occurs between two bearing plates, and it decreases when the spacing of pile increases.
Keywords： DX pile group-pile settlement numerical analysis
Numerical Simulation Research of Air Organization in Air Conditioned Hard-sleeper Compartment
Zhang Dengchun
Strategic Study of CAE 2004, Volume 6, Issue 9, Pages 66-72
The air organization research is the basis of thermal environment control in air-conditioned compartment. Reasonable air organization can availably improve the passengers' thermal comfort. By k-ε turbulence model, the air fluid flow and heat transfer in air-conditioned hard-sleeper compartment are simulated numerically. The airflow field and temperature field are investigated in different air supply modes and air supply parameters. The comparison is carried out between the computed and the measured results of temperature and velocity fields. The agreement between them is quite well. A basis is given for the optimized design of air organization in the air-conditioned passenger compartment.
Keywords： hard-sleeper compartment turbulence model air organization numerical simulation
Edge Computing Technology: Development and Countermeasures
Hong Xuehai and Wang Yang
Strategic Study of CAE 2018, Volume 20, Issue 2, Pages 20-26 doi: 10.15302/J-SSCAE-2018.02.004
Edge computing is an emerging technology that reduces transmission delays and bandwidth consumption by placing computing, storage, bandwidth, applications, and other resources on the edge of the network. Moreover, application developers and content providers can provide perceptible services based on real-time network information. Mobile terminals, Internet of things, and other devices provide the necessary front-end support for computing sensitive applications, such as image recognition and network games, to share the cloud work load with the processing capability of edge computing. This paper discusses the concept of edge computing, key problems that require solutions, main advances in edge computing, influence of edge computing developments, and opportunities and development countermeasures of edge calculation.
Keywords： cloud computing edge computing fog computing mobile edge computing internet of things front-end intelligence
Title Author Date Type Operation
Numerical Computational Aerodynamics Coefficient for Eje ction Seat
Yu Jia,Lin Guiping
Journal Article
Fast emergency control strategy calculation based on dynamic equivalence and integral sensitivity
Yi-fan GAO, Jian-quan WANG, Tan-nan XIAO, Dao-zhuo JIANG
Journal Article
Finite Element Numerical Model on Break and Collapse Process of Frame Building by Blasting
Zhang Qi,Wu Feng,Wang Xiaolin
Journal Article
Simulation on Flow Field Characteristic of Restricted Wall-attached Jet in Heading Face
Wang Haiqiao,Liu Ronghua,Chen Shiqiang
Journal Article
Differential evolution based computation intelligence solver for elliptic partial differential equations
Muhammad Faisal Fateh, Aneela Zameer, Sikander M. Mirza, Nasir M. Mirza, Muhammad Saeed Aslam, Muhammad Asif Zahoor Raja,muhammad.aslam@adelaide.edu.au
Journal Article
High-precision Numerical Computation of High-degree Gauss quadrature Nodes
Zhang Qingli,Wang Xiaomei,Yin Shaotang,Jiang Haihe
Journal Article
Numerical Computation of Flow and Pollutant Diffusion - Transportation With Non-orthogonal Curvilinear Coordinates
Wu Xiugang,Shen Yongming,Zheng Yonghong,Yang Zhifeng
Journal Article
Numerical Study on the Parabolic Mild-slope Equation
Shen Yongming,Zheng Yonghong,Wu Xiuguang
Journal Article
Study on Coal Seam Roof Gas Drainage from the Strike of Annular Fracture Areas by the Long Drill Method
Liu Zegong,Yuan Liang,Dai Guanglong,Shi Biming,Lu Ping,Tu Min
Journal Article
Study on load bearing characteristic of cast in situ DX group pile with numerical analysis
Zhang Qinglin,Chen Lihong
Journal Article
Numerical Simulation Research of Air Organization in Air Conditioned Hard-sleeper Compartment
Zhang Dengchun
Journal Article
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