数值计算

In this paper, the analysis indicated the result about modificative approximate calculating method of typical line, dovetailing into the experimental data. The calculation method, in this paper, can apply engineering analysis and design study of unsteady flow in the system of hydrodynamic piping network.

结果表明，本文推导的带修正的拟特征线数值计算方法的结果与我们的实验数据基本吻合，本文的计算方法可以应用到水力管网系统中非定常流动特性的工程分析与设计研究。

Fluent software was used as a calculaˉ tion platform, and its UDF compiler was used to inject mass, mome ntum and energy of ignition gas and propellant gas into chamber. Combining with kˉε twoˉequation turbulence model and Pˉl radiation model, the 3ˉD nume rical simulation of ignition transient process of some solid rocket motor with st arˉshaped charge and a cove was conducted.

文中以Fluent软件为计算平台，采用UDF编译来实现点火燃气和推进剂燃气的质量、动量、能量向燃烧室的注入，结合 kε两方程湍流模型、 P l 辐射模型对某有堵盖的星形装药固体火箭发动机的点火瞬态过程进行三维数值计算。

The Monte Carlo method is a calculated, but with the general numerical method a great difference.

蒙特卡罗方法是一种计算方法，但与一般数值计算方法有很大区别。

In this paper, Newton iteration formula for computing normal depth and critical depth was put forward by mathematical transformation of uniform flow equation and critical flow equation of circular section tunnel. Then, the relationship between the corresponding central angle and the introduced parameters was analyzed. An approximate formula for angle was obtained according to optimal uniform approximation principle. Using this approximate formula as initial value of iteration formula, a direct formula for calculating normal depth and critical depth of circular section tunnel was established after its first iterative.

该文通过对圆形断面均匀流方程与临界流方程的数学变换，分别得到其正常水深与临界水深的牛顿迭代公式，同时，通过对正常水深与临界水深对应的中心角与引入参数之间关系的分析及数值计算，利用最优一致逼近原理分别得到了正常水深与临界水深对应中心角的近似计算式，并以此近似计算式为初值，用迭代方程进行一次迭代得到了圆形断面均匀流水深与临界流水深的直接计算公式。

Temperature calculation models are established for the surface insulation of space targets both in the ideal case and in the nonideal case.

建立了在理想和非理想两种情况下空间目标表面隔热组件温度的计算模型，充分考虑了隔热组件传热的影响因素，并通过数值计算得到了隔热组件在太阳直射时各层温度的变化。

Quantitative relationship of the nonuniformity factor of TDF to heat transfer effectiveness is presented.

提出了传热效能与温差场不均匀因子之间的关联式，该式的计算结果与有关文献数值计算的结果符合较好。

Since two curves have the same coordinates and unit normal vector at the contacting point, the problem of the mesh of two planar curves is transformed into an ordinary differential equation by vector analysis. We have the solution to the equation by numerical method and computer calculation. After repeating the way of computing the solution to the equation, we have the contacting points.

因两曲线於接触点的位置相同，单位法线向量相等，由向量分析使曲线接触问题转变为常微分方程式，藉助数值计算与电脑运算得到方程式解，重覆计算方程式的解即可得每一接触点的位置。

A numerical analysis is carried out by using the corresponding program based on the theory given in this paper.

编制了相应的计算程序，并对数值计算结果进行了比较和分析。

In the process of dynamics calculation, direct numerical integration on a mesh can be used.

在实际的动力学计算过程中，是在网格上作数值计算。

It is found that the smaller the gap width, the bigger the heat transfer coefficient. And numerical calculation with k-ε-uv model has been performed to calculate the superheated vapor convective heat transfer.

本文采用k-ε-uv模型对环形狭缝通道内过热蒸汽换热与流动特性进行了数值计算分析，计算结果和实验结果符合的很好。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新