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An automatic grid generation approach over free-form surface for architectural design 被引量:11
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作者 苏亮 祝顺来 +1 位作者 肖南 高博青 《Journal of Central South University》 SCIE EI CAS 2014年第6期2444-2453,共10页
An essential step for the realization of free-form surface structures is to create an efficient structural gird that satisfies not only the architectural aesthetics,but also the structural performance.Employing the ma... An essential step for the realization of free-form surface structures is to create an efficient structural gird that satisfies not only the architectural aesthetics,but also the structural performance.Employing the main stress trajectories as the representation of force flows on a free-form surface,an automatic grid generation approach is proposed for the architectural design.The algorithm automatically plots the main stress trajectories on a 3D free-form surface,and adopts a modified advancing front meshing technique to generate the structural grid.Based on the proposed algorithm,an automatic grid generator named "St-Surmesh" is developed for the practical architectural design of free-form surface structure.The surface geometry of one of the Sun Valleys in Expo Axis for the Expo Shanghai 2010 is selected as a numerical example for validating the proposed approach.Comparative studies are performed to demonstrate how different structural grids affect the design of a free-form surface structure. 展开更多
关键词 grid generation free-form surface structure architectural geometry stress trajectory advancing front meshing technique
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Discussion of Grid Generation for Catamaran Resistance Calculation 被引量:11
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作者 邓锐 黄德波 +2 位作者 李佳 程宣恺 于雷 《Journal of Marine Science and Application》 2010年第2期187-191,共5页
In order to get some useful parameters for grid generation of catamaran, the CFD software FLUENT is used to investigate the main effects of grid generation on flow field calculation. The influences of some elements ar... In order to get some useful parameters for grid generation of catamaran, the CFD software FLUENT is used to investigate the main effects of grid generation on flow field calculation. The influences of some elements are investigated with a series of calculations in the present paper, and some alteratives are proposed. The proposed alteratives based on the analysis of the effects are used for a catamaran resistance calculation, comparisons of the calculated results with experimental data show good agreement. It shows that the research result of this paver is useful for the numerical calculation of catamaran. 展开更多
关键词 CATAMARAN RESISTANCE CALCULATION grid generation
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3D UNSTRUCTURED GRID GENERATION TECH-NOLOGY & EULER SOLUTION FOR WING/FUSELAGE COMBINATION 被引量:1
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作者 Sun Shaopeng Yang Zuosheng(Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China) 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1997年第2期81-86,共6页
Finite element method is based on element matrix, so regardless of whetherthe mesh is structured or unstructured, it Possesses an unified fashion of treatment. Finiteelement method in conjunction with unstructured gri... Finite element method is based on element matrix, so regardless of whetherthe mesh is structured or unstructured, it Possesses an unified fashion of treatment. Finiteelement method in conjunction with unstructured grid will improve the ability of numericalsimulation for complicated now field. In this paper, a 3D unstructured grid generationtechno1ogy is developed and the Euler equation on the unstructured mesh for real compli-cated aircraft configurations is solved by the finite e1ement method. Numerical results in-dicate that the method presented is reliable end efficient. 展开更多
关键词 grid generation (mathematics) finite element method fluid mechanics flow fields
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An automatic isotropic/anisotropic hybrid grid generation technique for viscous flow simulations based on an artificial neural network 被引量:4
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作者 Peng LU Nianhua WANG +2 位作者 Xinghua CHANG Laiping ZHANG Yadong WU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第4期102-117,共16页
Based on the author’s previous research, a novel hybrid grid generation technique is developed by introducing an Artificial Neural Network(ANN) approach for realistic viscous flow simulations. An initial hybrid grid ... Based on the author’s previous research, a novel hybrid grid generation technique is developed by introducing an Artificial Neural Network(ANN) approach for realistic viscous flow simulations. An initial hybrid grid over a typical geometry with anisotropic quadrilaterals in the boundary layer and isotropic triangles in the off-body region is generated by the classical mesh generation method to train two ANNs on how to predict the advancing direction of the new point and to control the grid size. After inputting the initial discretized fronts, the ANN-based Advancing Layer Method(ALM) is adopted to generate the anisotropic quadrilaterals in boundary layers. When the high aspect ratio of the anisotropic grid reaches a specified value, the ANN-based Advancing Front Method(AFM) is adopted to generate isotropic triangles in the off-body computational domain.The initial isotropic triangles are smoothed to further improve the grid quality. Three typical cases are tested and compared with experimental data to validate the effectiveness of grids generated by the ANN-based hybrid grid generation method. The experimental results show that the two ANNs can predict the advancing direction and the grid size very well, and improve the adaptability of the isotropic/anisotropic hybrid grid generation for viscous flow simulations. 展开更多
关键词 Advancing front method Advancing layer method Anisotropic quadrilateral grid generation Artificial neural network Isotropic triangular grid generation Machine learning
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A NEW METHOD OF DETERMING SOURCE TERMS OF POISSON EQUATIONS FOR GRID GENERATION 被引量:3
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作者 Wei Wen li, Wang De yi, Zhang Zong xiao, Liu Yu ling Xi′an University of Technology, Xi′an 710048, P.R.China 《Journal of Hydrodynamics》 SCIE EI CSCD 2000年第1期16-21,共6页
This paper is concerned with a new method to determine the source terms P and Q of Poisson equations for grid generation, with which a satisfactory grid can be obtained. The interior grid distribution is controlled by... This paper is concerned with a new method to determine the source terms P and Q of Poisson equations for grid generation, with which a satisfactory grid can be obtained. The interior grid distribution is controlled by the prior selection of grid point distribution along the boundary of the region, and the orthogonality condition in the neighborhood of the boundary is satisfied. This grid generation technique can be widely used in the numerical solution of 2 D flow in rivers, lakes, and shallow water regions. 展开更多
关键词 Poisson equations grid generation weighting functions
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GRID GENERATION OF COMPLEX PRACTICAL AIRCRAFT & ZONAL SOLUTION OF EULER EQUATIONS FOR HIGH-INCIDENCE VORTICAL FLOWS(HIVF) 被引量:1
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作者 Zhang Zhengke, Zhu Zhiqiang, Zhuang Fenggan (Institute of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China) 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1997年第3期2-8,共7页
A complete process of grid generation for complex practical aircraft is described with a twin tail fighter as an example. Euler equations are discretized in the generated multiblock grid by a finite volume method and... A complete process of grid generation for complex practical aircraft is described with a twin tail fighter as an example. Euler equations are discretized in the generated multiblock grid by a finite volume method and solved by a three stage explicit time stepping scheme in each block with some extra treatments of interface at each step. The predicted aerodynamic coefficients and vortical flow field are reasonable. 展开更多
关键词 fighter aircraft grid generation (mathematics) elliptic partial differential equations Euler equations zonal method
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Study on complicated solid modeling and Cartesian grid generation method
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作者 QIN Qiang HU ChangZhen MA TianBao 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第3期630-636,共7页
A Cartesian grid generation method is developed in this study.Two kinds of solid modeling methods,CSG and STL models,are used for complicated solid modeling.The staircase boundary approximation is implemented to handl... A Cartesian grid generation method is developed in this study.Two kinds of solid modeling methods,CSG and STL models,are used for complicated solid modeling.The staircase boundary approximation is implemented to handle irregular geometries and the computational domain is discretized using a regular Cartesian grid.Using the edge-based integral slice algorithm,the models are sliced with a set of parallel planes to generate 2D slices information.The scan line filling technique is used to achieve grid generation after slicing.Two grid generation examples with a CSG model and a STL model are given to test the capability of the grid generation method.For grid displaying,a method is proposed to remove the hidden surfaces fasten based on the topology of orthogonal hexahedral grids.The parallelization of grid displaying is achieved by employing multi-threaded parallel technique.Parallel test results show that the parallel algorithm has the absolute advantage on speed compared to the serial algorithm. 展开更多
关键词 solid modeling grid generation Cartesian grid staircase boundary treatment
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HEAT FLOW CONTROL BY TRANSFORMATION METHOD WITH GRID GENERATION METHOD
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作者 Zheng Chang Xiaoning Liu Gengkai Hu 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2014年第5期454-460,共7页
In the context of the transformation method, we propose a general approach to construct numerically the mapping generated by imposing specific boundary conditions with a targeted function, and the necessary material a... In the context of the transformation method, we propose a general approach to construct numerically the mapping generated by imposing specific boundary conditions with a targeted function, and the necessary material and heat source spatial distributions are then derived with the help of transformation method. The construction of mapping by grid generation method through solving partial differential equations circumvents the limitation of device geometry, which paves the way for designing more complex heat flow control devices. Two numerical examples are also given to show how to design material properties and heat source in order to control temperature patterns. 展开更多
关键词 heat conduction inverse problem transformation method grid generation
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National Electricity Generation,Electricity Consumption and Peak Load by Grid (April 2006)
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《Electricity》 2006年第2期49-49,共1页
Statistics on electricity generation and time of frequency over-limit;Statistics on electricity consumption and peak load.
关键词 National Electricity generation Electricity Consumption and Peak Load by grid April 2006 OVER
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National Electricity Generation,Electricity Consumption and Peak Load by Grid (March 2006)
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《Electricity》 2006年第2期49-49,共1页
Statistics on electricity generation and time of frequency over-limit;Statistics on electricity consumption and peak load.
关键词 National Electricity generation Electricity Consumption and Peak Load by grid March 2006 OVER
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An efficient algorithm for generating a spherical multiple-cell grid
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作者 Fang Hou Zhiyi Gao +1 位作者 Jianguo Li Fujiang Yu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2022年第5期41-50,共10页
This paper presents an efficient algorithm for generating a spherical multiple-cell(SMC)grid.The algorithm adopts a recursive loop structure and provides two refinement methods:(1)an arbitrary area refinement method a... This paper presents an efficient algorithm for generating a spherical multiple-cell(SMC)grid.The algorithm adopts a recursive loop structure and provides two refinement methods:(1)an arbitrary area refinement method and(2)a nearshore refinement method.Numerical experiments are carried out,and the results show that compared with the existing grid generation algorithm,this algorithm is more flexible and operable. 展开更多
关键词 spherical multiple-cell grid wave model WAVEWATCH III grid generation algorithm
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Improved Grid Relaxation with Zero-Order Integrators
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作者 Jan Mueller Hans-Georg Matuttis 《Journal of Applied Mathematics and Physics》 2021年第6期1257-1270,共14页
In this research, we have improved a relaxation method for triangular meshes intended for finite element fluid simulations which contain discrete element particles. The triangle edges are treated as springs which rela... In this research, we have improved a relaxation method for triangular meshes intended for finite element fluid simulations which contain discrete element particles. The triangle edges are treated as springs which relax their lengths towards a “better” force equilibrium where the triangles are closer to equilateral shape. The actual kernel is an improved zero order integrator which is able to follow reconfigurations of the particles faster than earlier methods. The improved relaxation allows larger timesteps in the flow simulation and leads to more stable, faster mesh reconfigurations for fast moving particles in the flow. Additionally, this demonstrates how integrators of the same order zero can nevertheless have different convergence speeds towards 展开更多
关键词 Zero-Order Solver EQUILIBRATION grid generation Fluid Mechanics
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Viscous flow simulations through multi.lobe progressive cavity pumps 被引量:4
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作者 F.M.El-Abd E.M.Wahba I.G.Adam 《Petroleum Science》 SCIE CAS CSCD 2020年第3期768-780,共13页
Computational fluid dynamics(CFD)simulations of multi-lobe progressive cavity(PC)pumps are limited in the literature due to the geometric complexity of the pump,which places numerous restrictions on the grid generatio... Computational fluid dynamics(CFD)simulations of multi-lobe progressive cavity(PC)pumps are limited in the literature due to the geometric complexity of the pump,which places numerous restrictions on the grid generation process.The present study attempts to alleviate such restrictions by developing a detailed numerical procedure for the numerical simulations of multi-lobe progressive cavity pumps.The profile equations for the multi-lobe configuration at any section at each instant of rotation are presented.A structured grid generation method is developed to generate mesh files required for CFD simulations of multi-lobe PC pumps.Results from the present procedure are validated against single-lobe PC pump numerical results available in the literature.Finally,a numerical parametric study is carried out to investigate the effect of the number of lobes,the stator pitch,the circular fillet and clearance on the volumetric efficiency of PC pumps with viscous oils. 展开更多
关键词 Progressive cavity pump Structured grid generation Computational fluid dynamics
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Three-dimensional transient numerical simulation for intake process in the engine intake port-valve-cylinder system 被引量:4
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作者 罗马吉 陈国华 马元镐 《Journal of Zhejiang University Science》 EI CSCD 2003年第3期309-316,共8页
This paper presents a KIVA-3 code based numerical model for three-dimensional transient intake flow in the intake port-valve-cylinder system of internal combustion engine using body-fitted technique, which can be used... This paper presents a KIVA-3 code based numerical model for three-dimensional transient intake flow in the intake port-valve-cylinder system of internal combustion engine using body-fitted technique, which can be used in numerical study on internal combustion engine with vertical and inclined valves, and has higher calculation precision. A numerical simulation (on the intake process of a two-valve engine with a semi-sphere combustion chamber and a radial intake port) is provided for analysis of the velocity field and pressure field of different plane at different crank angles. The results revealed the formation of the tumble motion, the evolution of flow field parameters and the variation of tumble ratios as important information for the design of engine in-take system. 展开更多
关键词 Internal combustion engine Intake flow Transient numerical simulation Dynamic grid generation
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High Resolution Ship Hydrodynamics Simulations in Open Source Environment 被引量:1
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作者 Norman Del Puppo 《Journal of Marine Science and Application》 2014年第4期377-387,共11页
The numerical simulation of wake and flee-surface flow around ships is a complex topic that involves multiple tasks: the generation of an optimal computational grid and the development of numerical algorithms capable... The numerical simulation of wake and flee-surface flow around ships is a complex topic that involves multiple tasks: the generation of an optimal computational grid and the development of numerical algorithms capable to predict the flow field around a hull. In this paper, a numerical framework is developed aimed at high-resolution CFD simulations of turbulent, free-surface flows around ship hulls. The framework consists in the concatenation of "tools", partly available in the open-source finite volume library OpenFOAM. A novel, flexible mesh-generation algorithm is presented, capable of producing high-quality computational grids for free-surface ship hydrodynamics. The numerical frame work is used to solve some benchmark problems, providing results that are in excellent agreement with the experimental measures. 展开更多
关键词 ship hydrodynamics high-resolution simulation grid generation FREE-SURFACE turbulence OpenFOAM
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Parabolic Wave Propagation Modelling in Orthogonal Coordinate Systems 被引量:1
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作者 袁德奎 林斌良 肖鸿 《海洋工程:英文版》 EI 2004年第3期445-456,共12页
This paper presents a numerical model study of the propagation of water waves using the parabolic approximation of the mild slope equation in the orthogonal coordinate system. Two types of coordinate systems are stud... This paper presents a numerical model study of the propagation of water waves using the parabolic approximation of the mild slope equation in the orthogonal coordinate system. Two types of coordinate systems are studied: (a) a general form of orthogonal coordinate system and (b) the conformal system, a special form of orthogonal coordinate system. Two typical examples, namely, expanded breakwaters and a circular channel, are studied to validate the model. First, the examples are studied by use of the general orthogonal coordinates. Then the same examples are computed by use of the conformal system. The computational results show that the conformal coordinate system generally gives better predictions than the general orthogonal system. A numerical technique for generating the conformal grid is combined with the numerical model to improve the practicability of the model. The comparison between the result from the numerical grid system and that from the analytical grid system shows that reliable computational results can be obtained by use of the numerical conformal grid system. 展开更多
关键词 orthogonal coordinates conformal mapping parabolic mild slope equation numerical grid generation
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Three-dimensional transient numerical simulation for gas exchange process in a four-stroke motorcycle engine
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作者 王春发 陈国华 +1 位作者 罗马吉 杨万里 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第10期1137-1145,共9页
Three-dimensional transient numerical simulation of gas exchange process in a four-stroke motorcycle engine with a semi-spherical combustion chamber with two tilt valves was studied. Combination of the grid re-meshing... Three-dimensional transient numerical simulation of gas exchange process in a four-stroke motorcycle engine with a semi-spherical combustion chamber with two tilt valves was studied. Combination of the grid re-meshing method and the snapper technique made the valves move smoothly. The flow structure and pattern in a complete engine cycle were described in detail. Tumble ratios around the x-axis and y-axis were analyzed. Comparison of computed pressure with experimental pressure under motored condition revealed that the simulation had high calculation precision; CFD simulation can be regarded as an im-portant tool for resolving the complex aerodynamic behavior in motorcycle engines. 展开更多
关键词 Motorcycle engine Gas exchange process Transient numerical simulation Dynamic grid generation
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EULER EQUATION SIMULATION FOR THE FLOWFIELD AROUND PROPELLER
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作者 钟伯文 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 1999年第1期11-15,共5页
An Euler solver is developed for calculating the flowfield around the propeller. The Euler equations are recast in the blade attached rotating coordinate system with absolute flow variables.The finite volume explicit... An Euler solver is developed for calculating the flowfield around the propeller. The Euler equations are recast in the blade attached rotating coordinate system with absolute flow variables.The finite volume explicit Runge Kutta time stepping scheme is employed for solving the equations.The presented method is applied for a two bladed propeller NACA10 (3) (066) 033.An algebraic O O grid is generated. Comparison of the mumerical results shows good agreement with the experimental data. 展开更多
关键词 PROPELLER Euler equations finite volume method Runge Kutta method grid generation
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Analysis on Aerodynamic Performance of Finite Swept Wing with Glaze Ice Accretions
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作者 AUNG Ko Wynn 《Computer Aided Drafting,Design and Manufacturing》 2010年第2期15-22,共8页
A computational investigation was performed to predict the effects of aerodynamic performance degradation on aircraft swept taper wing with and without 10 minutes and 22.5 minutes glaze ice accretions. In this study, ... A computational investigation was performed to predict the effects of aerodynamic performance degradation on aircraft swept taper wing with and without 10 minutes and 22.5 minutes glaze ice accretions. In this study, the three-dimensional simulated glaze ice shapes were defined from a series of two-dimensional ice sections. The aerodynamic performances of glaze iced swept wings with C-H structure multi-block grid were analyzed and evaluated. The steady Reynolds- Averaged Navier-Stokes (RANS) equations are employed to compute solutions with implementation of two equation Shear-Stress Transport (SST) turbulence model and second-order upwind differencing for entire iced wing flow field. Computed results were compared with available experimental data. The CFD computation can also accurately predict the aerodynamic performance degradation of lift, drag and pressure coefficients of finite swept wing with glaze ice accretions which have two big upper and lower horn. 展开更多
关键词 aerodynamic characteristics Reynolds-Averaged Navier-Stokes equations computational fluid dynamics computer aided design ice accretions grid generation numerical simulation
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NUMERICAL SOLUTION OF DIFFERENTIAL EQUATIONS IN IRREGULAR PLANE REGIONS USING QUALITY STRUCTURED CONVEX GRIDS
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作者 F.DOM´INGUEZ-MOTA P.FERNANDEZ-VALDEZ +2 位作者 S.MENDOZA-ARMENTA G.TINOCO-GUERRERO J.G.TINOCO-RUIZ 《International Journal of Modeling, Simulation, and Scientific Computing》 EI 2013年第2期115-129,共15页
The variational grid generation method is a powerful tool for generating structured convex grids on irregular simply connected domains whose boundary is a polygonal Jordan curve.Several examples that show the accuracy... The variational grid generation method is a powerful tool for generating structured convex grids on irregular simply connected domains whose boundary is a polygonal Jordan curve.Several examples that show the accuracy of a finite difference approximation to the solution of a Poisson equation using this kind of structured grids have been recently reported.In this paper,we compare the accuracy of the numerical solution calculated using those structured grids and finite differences against the solution obtained with Delaunay-like triangulations on irregular regions. 展开更多
关键词 Numerical grid generation direct generation method finite difference method finite element method Delaunay triangulation.
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