气化气体对流扩散的基本特征。
The basic characteristics of gas convective diffusion of underground coal gasification (UCG) are studied.
本文提出了数值求解对流扩散方程的局部解析算法。
A numerical method based on the local linear analytical solution is given for the nonlinear advection diffusion equations.
其数学模型是一组多层对流扩散耦合系统的动边值问题。
The mathematical model can be described as a coupled system of nonlinear partial differential equations with moving boundary values.
提出了求解含源汇项非定常对流扩散方程的一类高精度格式。
A high order accuracy compact difference method is presented for soling unsteady convection equation with source term.
控制方程采用通用的对流扩散方程并利用有限控制容积法离散。
The governing equations represented by the general convection diffusion forms are discretized using the finite control volume method.
我们探讨了正常呼吸状态下人体气道内氧及二氧化碳对流扩散问题。
The convective diffusive problems of oxygen and carbon dioxide in human airway at normal respiratory status were studied theoretically in the present paper.
运用待定系数法，建立了求解二维对流扩散方程的HAUC2格式。
By using the undetermined coefficient method, a new scheme is derived from the HAUC2 scheme to simulate the two dimensional convection-diffusion equation.
由对流扩散方程的对流系数和扩散系数确定了局域平衡分布函数的系数。
The coefficients in the equilibrium distribution are determined by the convection coefficient and the diffusion coefficient.
给出了解非线性对流扩散方程的线性修正的特征差分格式及交替方向格式。
Linear modified characteristic finite difference and alternating direction schemes are devised for nonlinear convection diffusion problems.
以有限体积法为核心，建立了求解二维浅水方程和对流扩散方程的模型体系。
Based on the Finite Volume Methods (FVM), model system is developed to solve the 2d shallow water equation and convection-diffusion equation.
将有限体积和有限元方法相结合，解决对流扩散方程问题，并给出了稳定性分析。
In this paper, finite bulk-finite element means is presented for solving convection-diffusion problem, moreover give out the stability analysis.
应用交替分段显隐方法求解变系数对流扩散方程，此方法具有很好的并行性且无条件稳定。
Using alternating segment explicit implicit method for the variable coefficient convection diffusion equation. The method has the obvious property of parallelism and is unconditionally stable.
文中利用泡函数构造数值，求解抛物型强对流扩散问题的稳定化方法，并给出收敛性分析。
A new stabilized finite element method by also presented use of residual-free bubbles for the parabolic convection-dominated diffusion problems, and proved the convergence.
文中利用泡函数构造数值，求解抛物型强对流扩散问题的稳定化方法，并给出收敛性分析。
A new stabilized finite element diffusion problems, method by also presented use of residual-free bubbles for the parabolic convection-dominated and proved the convergence.
引入指数函数，将对流扩散方程变换为扩散反应方程，消除了数值求解中较难处理的对流项。
To eliminate the difficulty in dealing with convection terms, an exponential transformation function is introduced to turn the CDE into their equivalent diffusion-reaction equations (DRE).
采用四结点四面体单元和八结点六面体等参数单元进行三维定常对流扩散方程的有限元分析。
The finite element analysis of three-dimensional steady-state convection-diffusion equation is given by using 4-node tetrahedral elements and 8-node hexahedral elements.
采用对流扩散方程并且考虑渗流作用的影响，研究了缓流水体底泥污染物对周围土层的影响。
This article studied the convection and diffusion of polluted materials in soil using convection and diffusion equation considering the effect of percolation.
采用对流扩散式中空纤维膜反应器转化L 天冬氨酸生成L 丙氨酸，转化率超过90 %。
The half life of the cell was 93h. In the production of L Ala by the hollow fiber membrane reactor, the conversion rate was over 90%.
讨论了对流扩散方程的第二逆风差分格式的一些性质，并说明了在自然对流计算中的某些问题。
Discusses some properties of the second upwind difference scheme for the convection-diffusion equation and explains certain questions in the computation of natural convection problems.
建立了海水太阳池的物理模型，分析了太阳池内的基本热平衡模型，双对流扩散模型和湍流卷吸运动模型。
The model of seawater solar pond was build up, and the basic heat balance model, double-diffusive process model and turbulent entrainment model were analyzed.
第四章里，对二维非线性对流扩散方程，构造了特征有限元的两重网格算法，并给出了相应的收敛性分析，数值例子。
In chapter 4, for 2d nonlinear convection-dominated diffusion equation, a two-grid scheme of characteristic finite-element solution is constructed.
确定了本文数值模拟所采用的网格的生成技术，对流扩散项的离散格式，压力修正与速度修正方法，以及非线性代数方程组的求解方法。
The grid generation technique, difference scheme of convective and diffusive terms, pressure and velocity correction methods and arithmetic of nonlinear equations are determined.
该方法避免了拉格朗日格式因网格畸变产生的数值困难，也克服了欧拉格式材料界面跟踪问题以及因非线性对流扩散项而引起的数值困难。
The MPM eliminates difficulty with mesh distortion as in the Lagrangian method, and with interface tracking and nonlinear convection term as in Eulerian scheme.
采用箱式模型、二维ADI流体方程和对流扩散模型计算浔江湾海水交换时间，分析浔江湾的水动力特点和湾内海水交换时空分布的特点。
With the box model, 2D ADI tidal current equation and convectiondiffusion model, the exchange time of Xunjiang bay water is computated.
在干湿交替区域混凝土中氯离子的输运属于在孔隙非饱和状态下离子浓度扩散和对流耦合的渗透。
The flow of chloride ions in the concrete of dry-wet cycling region is the combining of diffusion and advection.
粒子输运由向外扩散和向内对流构成。
The particle transport consists of outward diffusion and inward convection.
在CVD过程中，存在着大的温度差和浓度差，将引发自然对流和浓度扩散，它们又与气体的强迫流动以及反应器的几何尺寸和形状相互影响。
Large temperature and concentration differences taking place in CVD process lead to natural convection and concentration diffusion which interact with forced convection and complex reactor geometries.
其主要特点是：采用分步方法，对对流算子与扩散算子分别解析求解。
This method is an analytic scheme of fractional steps for convection operator and for diffusion operator respectively.
试验结果表明：污水射流扩散和近区内的稀释度主要决定于射流佛劳德数、相对水深和相对流速。
The results indicated that the diffusion and dilution of wastewater jet mainly depended on jet Froude Number, relative depth, and relative velocity.
还有像烟云扩散这样比较高级的程序，可以对流化床和蒸馏塔之类的过程建模。
Other more advanced programs like the plume one can model processes like fluidised beds and distillation columns.
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