数值方法

The discrete equation was deduced by control volume integral method, and realized by numerical method.

用控制容积积分法导出了离散方程，并用数值方法进行了求解。

Subsonic vortical flows over a slender body at different angles of attack were simulated numerically,and the aerodynamic characteristics of asymmetric vortical flow were also investigated.

运用数值方法模拟了细长体在不同攻角条件下亚音速绕流的背涡结构，探讨了非对称涡流的气动力特性。

This trend is particularly well-grounded in heat and fluid flow problems where there is an increasing need to test previously advocated fundamental

特别是在热流问题上，这一趋势更是如此，对以往提倡的基本理念进行检验及发展新数值方法的需要日益增长。

In this paper,a numerical method is used to investigate the effects of a winglet attached to an axial fan on the performance.

本文采用数值方法研究了叶片端导叶对轴流风扇性能的影响。

This research hope uses the information of "bond yield spread" and "the market value of equity" which is available in the market to do the calibration by "Nelder-Mead Simplex Method" numerical method, and obtain the theoretical default probabilities which calculates in the most suitable property market value and the volatility of property market value.

由於资产市值与资产市值波动度的难以评估，所以无法以正向带入变数预测公司违约机率，本研究主要希望利用市场上所能获得的资讯『公司债殖利率差』、『股东权益市值』对模型以Nelder-Mead Simplex Method的数值方法做回推求得在最适资产市值与资产市值波动组合下计算出的理论违约机率。

The different methods of controlling wake flow in engineering are introduced according to concept of absolutely and convectively unstable wake.

本文利用数值方法研究了静止圆柱和振动圆柱在不同流动条件下绕流流场的非定常性、不稳定性和非线性特征。

Nowadays, there come many numerical methods for Computational Electromagnetics including Electromagnetical Finite Element Method.

近年来，计算电磁学中发展了很多数值方法，其中以电磁场有限元的使用最广泛，并取得很多好的结果。

The surface of propeller blades and hub is discreted by a number of small hyperboloidal quadrilateral panels with constant source and doublet distribution.

本文建立了扰动速度势面元法预报螺旋桨表面非定常压力分布的理论和数值方法。

In this thesis, firstly, some main models have been checked on their accuracy, and the reliability of MACORS code has been verified by the RELAP5/MOD2 code on five transient conditions for QSNP: loss of flow; loss of offsite power; incontrollable control rod withdrawal; the feed-water temperature increasing and the feed-water lost. The results obtained are very satisfactory. Secondly, MACORS is used to calculate the operating and accident transients for QSNP, and the analysis results are significant to real engineering. And finally for MNRS, MACORS is used to simulate the steady-state natural circulation heat-removed capacity and the transient behaviors from forced circulation to natural circulation. Some important conclusions are obtained by the analysis results.

本论文首先从各方面对核动力系统中最主要的、热工水力特性最复杂的反应堆和蒸汽发生器进行单独验证和理论分析，其次分别利用RELAP5/MOD2程序和MACORS程序对秦山核电站的双环路失流、全厂断电、反应性事故引入、主给水参数变化及丧失主给水五种瞬态工况进行了计算，结果符合很好，从而证明了本程序模型的准确合理性，选择数值方法的有效性和编制程序的正确性；尔后，利用MACORS程序对秦山核电站的多种运行及事故瞬态进行了分析，得出了具有工程价值的结论；对船用核动力装置的稳态自然循环载热能力以及相应参数的特性、强迫循环与自然循环的过渡工况等进行了仿真分析，所得结论对我国核动力船舶的设计，运行以及安全审评具有重要的意义。

To find out the mechanism and controlling factors of the original lentoid sand reservoir,its oil-trapping process is numerically simulated on one dimensional condition based on the theory of two-phase fluid flow in compactable porous media,taking into account of its various related processes and parameters.

为了了解原生透镜状砂岩油藏的成藏过程和控制因素，基于变形多孔介质两相流动的基本原理，综合考虑地层在沉降过程中温度和压力的变化、砂岩体和围岩物性的变化、石油的生成以及岩石中孔隙流体物性变化等情况，应用数值方法模拟这类油藏在一维条件下成藏的整个过程。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐