数值方程

Based on unsteady N-S equation of three dimensional and compressible viscous fluid, the aerodynamic performance for the fast special container flat wagon at the speed of 160 km/h was calculated numerically by adopting the technology named slippage grid.

摘 要：利用三维、可压、非定常N-S方程，采用滑移网格技术对我国正在研制的160 km/h快速集装箱专用平车与动车组分别在明线和隧道内会车时的气动性能进行数值模拟。

Numerical simulation was conducted to investigate the flow field of internal cooling passages with both rib-roughened walls and film hole suctions and discharge coefficients of film holes,with rib angles 45°,60°,90°,120°respectively.

利用有限体积法对三维不可压缩的N-S方程进行离散，对同时带肋和气膜孔出流的内流冷却通道在45°，60°，90°，120°肋的结构下进行了数值模拟。

The flowfield numerical simulation of the axisymmetric jet emanating fromthe organ-pipe nozzle is made with the turbulence κ—ε two equations model, providing the basis for improving its cleaning ability.

采用湍流κ-ε二方程模型对风琴管式喷嘴内外流场进行数值模拟，弄清其流场的流动特性（轴向速度、径向速度的分布规律和衰减规律），为提高清除岩屑效率提供依据。

With the varying of the temperature, the repulsions of two out-of phase solitons are increasing.

将两束相干光束作为入射波，在不同温度下采用数值方法求解波传播方程。

In this dissertation, at first, the history and present situation of the research related to overheating is reviewed, and then the research works are carried out in following aspects the calculation of radiative properties of coal combustion, the solution of radiative transfer equation in absorbing-scattering media, the analyses of combined heat transfer processes in flue side, the computation method of steam temperature deviation of superheaters and reheaters and the inversion method of their wall metallic temperature in furnace, the numerical simulation of gas-solid two-phase flow, combustion and heat transfer in furnace, the measurement of outlet steam temperature of superheaters and reheaters, engineering reformation of overheating and optimum design of superheaters and reheaters, etc.

本文在综述了与过热器和再热器超温问题有关的研究历史与现状的基础上，在煤粉燃烧产物辐射特性的计算、含散射问题的辐射传递方程的求解、过热器和再热器烟气侧对流与辐射复合换热及汽温偏差的计算和炉内金属壁温的反演、炉内气固两相流动、燃烧、传热过程的数值模拟、过热器再热器炉外出口汽温的测量、过热器再热器超温问题的工程改造及设备的优化设计等方面进行了研究。

Male and female subjects were divided into 4 groups, respectively, according to their baPWV quartiles. Multiple-stepwise regression was employed to analyze the independent risk factors for baPWV grading.

根据baPWV数值将男女各分4组，将相关代谢指标代入多元逐步回归方程，得到baPWV分级的独立危险因素。

The process of radiative heat transfer in a three dimension rectangular furnace is simulated using discrete ordinates method.

本文首先对辐射传递方程的坐标进行离散，最后对三维矩形炉膛内辐射传递过程进行数值模拟，并与区域法进行比较，从而验证了离散坐标法的求解精度。

A new simplified mathematical model has been established based on the balance of total energy with radiative heat transfer equation solved by discrete ordinates method.

采用数值模拟的方法，在进行合理简化后，建立总能量平衡基础上的炉内热过程数学模型，其中辐射传递方程的求解采用离散坐标法。

Rectangular and unstructured hybrid grids, re-normalization group k-ε turbulence model and discrete ordinates radiation model were adopt for the steady-state numerical calculation of air velocity filed and temperature filed, and obtained the distribution of air flow velocity and temperature in the passenger compartment.

采用矩形与非结构混合网格、RNGκ-ε两方程湍流模型、DO辐射模型对车室内的空气速度场及温度场进行了稳态数值模拟计算，获得了车室内空气流速及温度的分布情况。

In connection with residual oil film of different forms after water flooding on the oleophilic rock and the viscoelasticity character of the polymer solution,the Upper-Convected Maxwell constructive equation of viscoelastic fluids was choosed,the model was analysized numerically by using computation fluid software-Polyflow.

针对亲油岩石水驱后残余油膜的存在形式及聚合物溶液的粘弹特性，选取粘弹性流体中的上随体Maxwell本构方程并使用计算流体软件Polyflow对模型进行数值分析。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。