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In order to study the numerical method to solve the viscous incompressible flow with free surface, the 3-D mathematical model for steady and unsteady hydrodynamic problem had been established and closed by k-εbuoyant turbulence model. The algebraic coordinate transformation method was used to fit the free surface, the Runge-Kutta method of three step and second precision was devised to simulate the time step. A high precision up-winding compact scheme was studied for the convection term, and the generalized conjugate residual method was set to solve the Poisson equation.

为了研究粘性不可压缩三维问题的数值求解方法,本文从基本的Navier-Stokes方程出发,采用代数拟合方法处理自由表面,用三级二阶Runge-Kutta方法对时间步进过程进行了模拟,并且对对流项的高精度迎风格式进行了研究,给出了求解压力Poisson方程的广义共轭剩余法,从而建立了能够模拟有自由表面的粘性不可压缩问题的定常、非定常三维水动力学模型,并采用k—ε浮湍流模型对其进行封闭。

High precision format, unstructured dynamic mesh with a large displacement and multi-species gas flows were computationally expensive, the problem of resourceless and inefficient of single computer appeared. Parallel arithmetic based on PC-Cluster system for the oblique detonation wave flow and the muzzle flow include high speed projectile were discussed. The results proved that the rationality of parallel arithmetic provided a new method to simulate the complex chemical reaction flows. The present code represents a validated, efficient and versatile tool developed for the simulation of hypersonic multi-species chemical non-equilibrium flows.

高精度计算格式、化学反应源项的刚性和大位移的运动边界处理都给计算和存储带来了沉重的负担,单机资源不足和计算时间长的问题凸现,利用PC机和局域网资源建立分布存储式并行计算系统,并基于非结构动网格和分区算法开发了复杂化学反应流场数值模拟的并行计算程序,对高速飞行实验弹丸诱导的斜爆轰波流场和含有大位移动边界的膛口燃气射流场进行了并行模拟,有效地缩短了计算时间,扩展了计算规模,为复杂化学反应流数值模拟研究提供了新的手段。

Main behaviour of social nature is: compelling force, adjustment, general availability, procedure and culture. The logicality mainly shows by: assuming the form, arrangement of ideas and scientificalness handling sanction. Technicality shows by: main characteristics such a accuracy, rigorousness, authority, being realistic and high-efficient.

社会性主要表现为:强制力、调节性、通用性、可依据性、程序性和文化性;逻辑性主要表现为:假定-处理-制裁格式、层次性和科学性;技术性主要表现为:准确无误性、严谨周密性、权威性、求实性高效性。

The methods used here are proved be correct therefore are useful for the numerical simulation in unsteady incompressible flow with dual time step and preconditioning . Simulation to the sand saltation is carried.

文中所采用的双时间法的数值求解方法、边界条件的提法、差分格式的选取经验证是成功的,为双时间法与预处理方法的结合对低马赫数流动的数值计算积累了宝贵的经验。

In the GRID environment of ArcGIS, original format of digital image of the leaf was transformed sod the leaf image resolution made finer by using re-sampling functions. Leaf area was then extracted from the digital leaf image using self-ordained chroma diagnosis program in arc-macro language.

该方法在ArcGIS的GRID模块下对叶片图像进行格式转化和重新采样处理,使用自行编写的色阶诊断程序提取图像中叶片的叶面积。

Of course, you can add a Serialize virtual function to deal with your specially formatted documents, later realized this.

当然,你可以在增加一个Serialize虚函数来处理你的特殊格式的文档,这个留待以后实现了。

In this dissertation, the numerical method solving the model equation influid motion in some sense has solved some tough problems which traditionalmethods cannot, as in the case of capturing shockwave, enhancing resolution, andspeeding computation. In terms of capturing shockwave and enhancing resolution,this method has proved to be superior to difference method; in terms of speedingcomputation, superior to TVD scheme. Particularly, it is highly effective to solveodd singular solution problems.

本文研究的求解描述流体运动的若干模型方程的数值方法,在一定程度上解决了传统方法在某些方面的难点问题,如在捕捉激波、提高分辨率方面优于差分法,在计算速度方面优于TVD格式,特别是对处理有奇异解的问题很有效。

By using constructing elements between GPS net work point and state control point determined by ordinary survey instruments and making use of converting formula of the WGS-84 coordinate system and occupation station original based grid system, the WGS-84 coordinates of the state control point were calculated.

针对GPS控制网与国家控制点联测时遮挡严重的问题,提出了一种虚拟基线的方法,即通过常规方法测出GPS网中某点与国家控制点之间的基线构造元素,并利用WGS84地心坐标系与站心地平直角坐标系之间的转换模型计算出国家控制点的WGS84地心坐标,然后根据GPS商业处理软件的基线格式构造出GPS网中某点与国家控制点之间的虚拟基线,并入整个GPS控制网中进行平差解算。

Numerical experiments,including supersonic flow,subsonic flow and low speed flow,show that the al...

验证算例包括超声速、亚声速以及极低速情形的化学反应流场,计算结果表明基于预处理AUSM+格式发展的算法能够有效地用于全速域范围内化学反应流动问题的模拟。

TimeCard Tabulator II uses AM/PM or 24 hour formats, handles most forms of rounding and breaks and can be used in nearly all types of timecard math.

考勤Tabulator二使用的AM / PM或24小时格式,处理最形式的四舍五入和休息,可用于几乎所有类型的考勤数学。

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However, as the name(read-only memory)implies, CD disks cannot be written onorchanged in any way.

然而,正如其名字所指出的那样,CD盘不能写,也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口,替代木托盘,免薰蒸,符合欧盟、北美各国对出口货物包装材料的法令要求;喷涂钢托盘适用于重载上货架之用,托盘表面根据需要制作成平板状、波纹状及间隔形式,满足不同的使用要求。

A single payment file can be uploaded from an ERP system to effect all pan-China RMB payments and overseas payments in all currencies.

付款指令文件可从您的 ERP 系统上传到我们的电子银行系统来只是国内及对海外各种币种付款。