FEFLOW在X煤矿地下水数值模拟中的应用

摘FEFLOW是目前广泛应用的三维有限元地下水数值模拟软件,在地下水分析中有着广泛的应用。文章利用FEFLOW对X煤矿矿区地下水建立数值模型,对地下水的运移情况进行数值模拟,研究矿区地下水水位的变化情况,并分析降落漏斗的形成原因。     

Visual MODFLOW在地下水数值模拟中的应用

数值方法是解决非均质含水层和各向异性等复杂条件的地下水流动问题的有效方法,可以较真实地描述含水层各种特征。以安徽淮北五沟煤矿西三采区为例,利用放水试验数据,构建符合客观实际的水文地质概念模型及其数学模型,采用MODFLOW地下水模拟软件,模拟煤层底板灰岩含水层流场的变化特征,获取优化的水文地质参数,以及在安全突水系数条件下的井下疏放量大小,为煤矿安全开采提供理论依据。     

数值模拟在焙烧炉设计中的应用

针对焙烧炉的运行特点进行分析，提出将焙烧炉分为两个模型(火道模型和传热模型)进行模拟。其中，火道模型解决火道结构设计问题，传热模型解决温度曲线等问题。分别介绍了这两个模型的几何模型和数学模型，并通过计算实例说明了其在焙烧炉设计中的应用。文中对两种模型的耦合和模型参数取值问题亦进行了说明。     

神经网络在油藏数值模拟中的应用

油藏数值模拟的主要内容是从产量方面预测经济效益,目标是用最小的投资获得最便捷的开采方式进而从油藏中得到最合适的油气资源配置,油藏实际开采中的非均质性导致水淹越来越严重。因此在再现油田的实际开采过程时数据更加复杂,所以神经网络在油藏数值模拟中得到广泛应用。尤其在解释渗透率、饱和度、孔隙度等参数和分析油层水淹情况、岩性油藏的含油边界等方面的应用更为普遍。与常规方法相比,不需要建立计算公式和具体模型,有很强的预测精度和适应性。     

流线模拟技术在油藏数值模拟中的应用

流线模拟具有计算速度快,收敛性强的特点,可以快速优选随机地质模型。给出了流线模拟的数学方法,以国内某油田为实例,应用序贯高斯随机模拟方法建立了三个等概率的随机地质模型,并进行了流线模拟,通过计算机流线模拟再现了地下流体的流动动态。对三个等概率随机模拟模型进行优选,流线模拟结果表明,随机地质模型应该优选模型1,并给出模型1的流线图。流线图显示了流体从注水井流向采油井的方向和数量,相当准确地确定了注水井和采油井之间的连通情况。     

数值模拟技术在剩余油分析中的应用

本文应用数值模拟的方法建立示范区动态模型并进行了示范区历史拟合,根据数值模拟结果,分析了示范区高台子油层纵向和平面剩余油分布,总结了示范区高台子油层剩余油分布规律,为剩余油精细挖潜和调整措施制定奠定地质基础。     

数值模拟技术在剩余油分析中的应用

本文应用数值模拟的方法建立示范区动态模型并进行了示范区历史拟合,根据数值模拟结果,分析了示范区高台子油层纵向和平面剩余油分布,总结了示范区高台子油层剩余油分布规律,为剩余油精细挖潜和调整措施制定奠定地质基础。     

流场数值模拟技术在脱硫塔托盘设计中的应用

采用k-ε湍流模型对某燃煤锅炉烟气脱硫塔的托盘结构进行了数值模拟,分析了各种孔隙率下,在托盘上方形成的持液层高度及因此而产生的压降,对脱硫塔托盘的开孔率和开孔尺寸的设计起到了指导作用。在此分析基础上选取合适的开孔率并对脱硫塔整体建模进行CFD流场数值模拟分析,分析结果满足工程实际需要,并已成功应用于某热电厂,实际运行效果良好。     

数值模拟在挤出机头中的应用

介绍了20世纪90年代以来数值模拟在挤出机头应用中的研究进展，讨论了简单挤出机头，异型材挤出和共挤出的数值模拟的研究成果。     

采矿工艺技术在采矿作业中的应用

我国现有采矿作业已广泛应用了现代化的采矿工艺技术,并且这种先进的采矿工艺技术在采矿工作中的作用十分明显。基于对采矿工艺技术的应用及相应的技术改造的分析,以更好的保证采矿工艺技术的应用水准,从而进一步提高采矿工作的效率。     

油藏数值模拟求解中的IMPIMS方法

在油藏数值模拟中对数值模型进行求解,目前基本有两类方法：一类是顺序求解法,如IMPES方法和IMPIMS方法;一类是联立求解法,如半隐式法和全隐式法。IMPIMS方法是一种顺序求解方法,是IMPES和半隐式方法的混合变种。它既具有半隐式求解饱和度的特点,又保留了IMPES方法省内存,省计算工作量的优势。     

数值模拟中低Reynolds数下简单剪切流流过单液滴的稳态流场(英文)

This work presents a numerical investigation on steady internal, external and surface flows of a liquid sphere im-mersed in a simple shear flow at low and intermediate Reynolds numbers. The control volume formulation is adopted to solve the governing equations of two-phase flow in a 3-D spherical coordinate system. Numerical re-sults show that the streamlines for Re=0 are closed Jeffery orbits on the surface of the liquid sphere, and also closed curves outside and inside the liquid sphere. However, the streamlines have intricate and non-closed struc-tures for Re≠0. The flow structure is dependent on the values of Reynolds number and interior-to-exterior vis-cosity ratio.     

Numerical simulation of steady flow past a liquid sphere immersed in simple shear flow at low and moderate Re

This work presents a numerical investigation on steady internal, external and surface flows of a liquid sphere im-mersed in a simple shear flow at low and intermediate Reynolds numbers. The control vol...     

不同尺寸异径管的冲蚀数值模拟研究

运用Fluent软件中的DPM模型对不同入口颗粒浓度下不同尺寸异径管的冲蚀磨损进行数值模拟研究。通过数值模拟得出异径管冲蚀情况与入口浓度和尺寸之间的关系。结果表明,不同尺寸异径管的严重冲蚀区域都位于变径区域壁面;在相同的入口速度下,异径管的冲蚀磨损随着入口浓度的增大而上升;异径管的冲蚀磨损随着变径角度的上升成先上升后下降的现象,且冲蚀严重区域形状随角度的上升从斑点状向环状转变,并存在最严重冲蚀角度。     

Appraisal of three-dimensional numerical simulation for sub-micron particle deposition in a micro-porous ceramic filter

A computational, three-dimensional approach to investigate the behavior of diesel soot particles in the micro-channels of a wall-flow, porous-ceramic particulate filter is presented. Particle size examined is in the PM2.5 range. The flow field is simulated with a finite-volume Navier-Stokes solver and the Ergun equation is used to model the porous material. The permeability coefficients were obtained by fitting experimental data. Particle flow, dispersion, deposition and wall-particle interactions are investigated tracking large swarms of 2 and diameter particles in a Lagrangian frame of reference. Particle dynamics included rarefied gas hypotheses (the Knudsen number being larger than unity) and bounce/capture models based on impact kinetic energy loss. The influence of gas molecules-particle interaction on overall particle behavior is also examined by including Brownian motion and partial slip in particle equation of motion. Simulations help to highlight three-dimensional non-uniform particle deposition, mainly due to flow distribution in the micro-channel. All particles deposit onto the porous filter wall following the distribution of the through-wall velocity. The larger, , particles show a larger tendency to deposit at the end of the filter. Due to the flow contraction at the inlet, virtually no particle deposit in the inlet section of the filter. Reasons for the scarce influence on particle deposition due to particle-flow slip and Brownian motion are given.     

冬瓜山矿床开采方案优化的数值模拟研究

通过正交试验的方法,运用RFPA数值程序研究了不同开挖步骤、充填体刚度、充填接顶情况对铜陵有色金属公司冬瓜山矿挖稳定性的影响。以采场破坏和峰值载荷为评判依据,试验表明,在给定的数值试验条件下,充填接顶对峰值载荷影响最大,而充填体刚度影响最小,这表明,在冬瓜山矿开采过程中,一定要保证充填的接顶质量。     

Optimal design of a wet-type desulphurization absorber by the numerical simulation method

Numerical study of gas–liquid flow in a wet-type desulphurization absorber is presented and the influences of different inlet and deflector structures on the device performance are identified for optimizing its structure. The dependability of numerical model is validated by the good agreement between the measured and predicted results. Besides, the results of droplet trajectories analyzed by the mechanical formulas are consistent with the simulation results as well. The performance of gas flow field is affected significantly by the inlet structures. The main reason for uneven distribution of liquid-phase is the first layer deflector rather than the gas flow. After removing the first layer deflector, the mass percentage distribution of liquid-phase in the near-wall region is reduced from 68–87% to 25–40%. The temperature distribution and relative humidity depend largely on the distribution of liquid-phase and the gas flow field. Optimized structures improve the pressure drop of device.     

Parametric investigations of premixed methane-air combustion in two-section porous media by numerical simulation

Motivated by detailed designs of industrial porous burners published in patents, the combustion of methane-air mixtures in a two-section porous burner has been studied numerically. The software FLUENT is used to solve a two-dimensional transient mathematical model of the combustion. In order to reveal the reality of the combustion in porous media, the user defined function (UDF) is used to extend the ability of FLUENT and enable two-dimensional distributions of temperature and velocity to be obtained. Some operating or property parameters, which mainly affect the functions and quality of the industrial burner design, such as the inlet velocity of the reactants, the equivalence ratio, the extinction coefficient and the thermal conductivity of porous media, have been investigated. The results show that the contours of temperature and velocity change considerably at the interface of the porous media and near the wall, the gas temperature at the low inlet velocity limit is higher than that for the high velocity limit, the thermal conductivity in the upstream section has more influence on the temperature than that in the downstream section and finally, the temperature profiles of both the gas and the porous skeleton vary considerably with changes of the radiative extinction coefficient of the large-pore porous media.     

气升式环流反应器数值模拟研究进展

介绍了计算流体力学在气升式环流反应器(二相、三相)中的应用,汇总并介绍了气升式环流反应器的气含率和循环液速的二维与三维数值模拟结果,提出今后进一步的研究方向。     

仿真软件在数控教学中的应用

由于数控技术发展迅速,目前市场上的数控设备型号多样,并且数控系统更新较快,对学校而言不可能将所有系统配齐。这就导致学生所学与工厂所用不符。数控仿真软件在数控技术专业教学中的合理应用,既可以提高数控人才的培养质量和效率,还可以缓解学校的经济压力,但其缺点也不容忽视。只有在教学中将仿真训练与实践操作训练有机结合,摆正仿真软件在整个专业教学中的位置,才能充分地发挥其作用,才能真正为教学服务。