Study of Scale-Down Method for Dense Grid Points

2013 ◽  
Vol 734-737 ◽  
pp. 3011-3015
Author(s):  
Sheng Yun Yu ◽  
Chang He Song ◽  
Hai Ying Xu
Keyword(s):  
Numerical Simulation ◽  
Geological Model ◽  
Three Dimension ◽  
Reservoir Heterogeneity ◽  
Geological Models ◽  
Scale Down ◽  
Dense Grid ◽  
Grid Points ◽  
Renormalization Method

The data of three-dimension geological models are very large, this kind of three -dimension geological model can not be directly used for numerical simulation and must be scaled down. The reservoir parameters, especially permeability, are scaled down by the simple renormalization method. The interbeds and parts of strong heterogeneity are filled back. The simple renormalization method is good through evaluation , not only it reduces the number of grid points, but also retains reservoir heterogeneity.

Study of Scale-Down Method to Maintain Reservoir Heterogeneity

2013 ◽  
Vol 295-298 ◽  
pp. 2766-2769
Author(s):  
Sheng Yun Yu ◽  
Dong Su ◽  
Hai Ying Xu
Keyword(s):  
Numerical Simulation ◽  
Frequency Distribution ◽  
Three Dimensional ◽  
Correlation Coefficients ◽  
Harmonic Mean ◽  
Technical Level ◽  
Geological Model ◽  
Huge Amount ◽  
Reservoir Heterogeneity ◽  
Scale Down

Because of the limited hardware technical level, we seldom use the three-dimensional geological model with a huge amount of data directly for numerical simulation, we must reduce the amount of data.In this paper we use a part of some oilfield as an example, we scale down the parameter of permeability by the harmonic mean method and we use the grid backfilling technology for parts which have interbeds or strong heterogeneity. We evaluate scale-down model by contrast of model maps, colour graphs of frequency distribution, heterogeneous parameters, errors compare, correlation coefficients compare and calculation time-consuming. The scale-down geological model has less grids and maintains reservoir heterogeneity.

Numerical Simulation of Filling and Solidification in Sand Casting by Procast

2013 ◽  
Vol 791-793 ◽  
pp. 550-553 ◽  
Author(s):  
Dong Dong Han ◽  
Cheng Jun Wang ◽  
Juan Chang ◽  
Lei Chen ◽  
Huai Bei Xie
Keyword(s):  
Numerical Simulation ◽  
Heat Dissipation ◽  
Solidification Process ◽  
Simulation Software ◽  
Sand Casting ◽  
Production Costs ◽  
Raw Material ◽  
Casting Defects ◽  
Three Dimension ◽  
Filling And Solidification

At present, pulley produced in China has been able to meet the demand of domestic and international markets. But there are many problem of the pulley industry in our country, such as too many production enterprises and the low level of export products. And as components of drive system are light weight and raw material price of pulley casting are rising, manufacturing requirements of the pulley are also more and more high. Aiming at the casting defects of pulley that enterprise current product, pulley casting blank model of common material HT250 be made by three-dimension software, numerical simulation of filling and solidification process for pulley sand casting by the casting simulation software Procast, the size and location of the various casting defects were forecasted and analyzed, reflecting the pulley filling and solidification process of the actual situation, due to the thicker pulley rim and less heat dissipation, position of shrinkage is close to the middle of rim [, a method of eliminating defects is proposed to realize sequential solidification, and thus to minimize porosity shrinkage and improve casting performance and reduce casting time and reduce production costs.

Three Dimensional Bacteria Concentration by Negative Dielectrophoresis

2013 ◽  
Vol 699 ◽  
pp. 251-256
Author(s):  
T. Hisajima ◽  
L. Mao ◽  
K. Shinzato ◽  
M. Nakano ◽  
J. Suehiro
Keyword(s):  
Escherichia Coli ◽  
Numerical Simulation ◽  
Dielectric Layer ◽  
Parallel Plate ◽  
Three Dimensional ◽  
Three Dimension ◽  
Escherichia Coli Cells ◽  
Opposite Electrode ◽  
Novel Method ◽  
Thin Dielectric Layer

Thispaper reports a novel method to concentrate bacteria in three-dimension by negative dielectrophoretic (n-DEP) force in a microchannel. This was achieved by placing a thin dielectric layer on one of a pair of parallel plate electrodes. The dielectric layer having a home-plate like pentagonal shape, forms a gradient of electric field causing n-DEP. A three-dimensional numerical simulation of bacteria trajectory predicts that bacteria flowing a microchannel were three-dimensionally concentrated beneath the tip of the pentagonal dielectric thin layer. The trajectory and concentration of bacteria under n-DEP force were also experimentally confirmed using Escherichia coli cells. Bacteria moved along edges of the dielectric layer and were pushed to the opposite electrode, resulting in their concentration in three-dimension. The proposed device might be applicable to selective concentration of bacteria depending on their dielectric properties.

An Investigation on Numerical Simulation Method for Aero-Acoustics Based on Acoustics Analogy

2013 ◽  
Vol 444-445 ◽  
pp. 462-467
Author(s):  
Dang Guo Yang ◽  
Yong Hang Wu ◽  
Jin Min Liang ◽  
Jun Liu
Keyword(s):  
Numerical Simulation ◽  
Near Field ◽  
Time Lag ◽  
Sound Field ◽  
Leading Edge ◽  
Simulation Method ◽  
Three Dimension ◽  
Sound Waves ◽  
Acoustic Analogy ◽  
Numerical Simulation Method

A numerical simulation method on noise prediction, which incorporates aerodynamics and sound wave equations based on acoustic analogy, is presented in the paper. Near-field unsteady aerodynamic characteristic can be obtain by large eddy simulation (LES), and far-field propagation of sound waves and spatial sound-field can be obtain by solving the time-domain integral equations of Ffowcs Williams and Hawings (FW-H). Based on the method, a numerical simulation was done on a two-dimension cylinder and a three-dimension flat plate with blunt leading edge. The agreement of numerical results with experiment data validated the Feasibility of the method. The results also indicate that LES can describe vortex generation and shedding in the flow-fields, and FW-H formulation, which has taken time-lag between sound emission and reception times into account, can simulate time-effect of sound propagation toward far-fields.

Numerical Simulation on Dynamic Behavior of Intermittent Roller Chain Drives

2012 ◽  
Vol 155-156 ◽  
pp. 535-539 ◽  
Author(s):  
Li Xin Xu ◽  
Yong Gang Li
Keyword(s):  
Numerical Simulation ◽  
Dynamic Behavior ◽  
Simulation Analysis ◽  
Longitudinal Vibration ◽  
Three Dimension ◽  
Chain Drive ◽  
Rigid Body Dynamic ◽  
Analysis And Design ◽  
Roller Chain ◽  
Chain Drives

A detailed numerical simulation analysis on the dynamic response of intermittent roller chain drive has been carried out in this study. Instead of using analytical method, three dimension solid modeling software and multi-rigid body dynamic analysis software are utilized for modeling and simulating the dynamic behavior of chain drive. The longitudinal vibration response of the chain links is concentrated on, which aims to reveal the dynamic characteristics of the intermittent chain drive under varying motion laws such as the modified sinusoid (MS), the modified constant velocity (MCV) and the unsymmetrical modified trapezoid (UMT). The simulation results can enable designers to require information on the analysis and design of mechanisms with the intermittent roller chain drives.

The Graphite Particle Movement in Fuel Handing System Bend Pipe in the High Temperature Gas-Cooled Reactor

2013 ◽  
Author(s):  
Jinyi Zhang ◽  
Hanliang Bo ◽  
Wenping Hu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Graphite Particle ◽  
Particle Collision ◽  
Three Dimension ◽  
Particle Movement ◽  
Helium Flow ◽  
Bend Pipe ◽  
Different Diameters ◽  
Helium Three

A typical bend pipe in the fuel transporting and refueling system in the HTR is studied. The helium three-dimension flow field in the bend pipe is simulated and the graphite dust particle movement and impingement in the helium flow field are researched by numerical simulation. The trajectories of graphite particles with different diameters and different initial positions are simulated. The position and probability of the graphite particle collision is studied by the numerical simulation on the particle movement.

Evidence of longitudinal vortices evolved from distorted wakes in a turbine passage

2001 ◽  
Vol 446 ◽  
pp. 199-228 ◽  
Author(s):  
XIAOHUA WU ◽  
PAUL A. DURBIN
Keyword(s):  
Numerical Simulation ◽  
Free Stream ◽  
Parallel Computer ◽  
Longitudinal Vortices ◽  
Low Pressure Turbine ◽  
Turbine Stator ◽  
Local Mean ◽  
Flow Through ◽  
Grid Points ◽  
Secondary Vortices

Two types of longitudinal vortices are found to arise from distorted, migrating wakes convecting through a low-pressure turbine stator passage. The primary vortices emerge within the free stream as the wake is subjected to irrotational strains. Their axes align approximately with the local mean wake velocity. They are dragged over the surface and induce secondary vortices near the wall, which have the opposite sense of rotation to the primary vortices. Although they form on the concave side, these secondary vortices are neither produced, nor sustained by Görtler instability; rather, they are a consequence of severely straining the passing wakes.Evidence is drawn from a numerical simulation of the unsteady, incompressible flow through a turbine stator passage with and without upstream turbulent wakes. The computations were performed with 2.5 and 5.7 × 107 grid points on a parallel computer.

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