本文介绍了求解非饱和土壤中热量和水分耦合传输问题的一种数值方法——积分有限差分方法(IFDM)。
In this paper, an integrated finite difference method (IFDM) for numerical analysis of transient coupled heat and moisture flow in unsaturated soils is described.
但这一偏微分方程不能直接积分，所以通常用纳维法、瑞利-里兹法、有限差分方法等方法求解。
But this partial differential equation can not be directly integral, so usually use Navier method, Rayleigh Ritz method and finite difference method and other methods.
数值算例表明，用精细积分法得到的解与精确解十分吻合，比有限差分法具有更高的精度。
The results of the precise integration method agree well with the theoretical solution and have higher precision than those of the finite difference method.
提出一种求解基于细线结构的时域电场积分方程(TDEFIE)的方法-有限差分方法。
A finite difference method was derived for the analysis of time domain electric field integral equation (TDEFIE) of thin wire structures.
对于坑(井)—地的特殊情况，利用有限差分和积分方程法进行了正演模拟计算，获得了数据。
For the pit (well) -ground special circumstances, Using the finite difference and integral equation method forward modeling Observation data.
采用二分步法，从积分型方程出发，在有限控制体上建立守恒型差分格式，对二维浅水波方程进行求解。
By use of the time split method, a conservation difference formula is established to find the solution to the shallow water equation based on the finite volume control method from integral equations.
对于层状模型，若采用直接积分的中心差分方法，计算过程十分简单，也可用于有限差分等方法的计算中。
For a layered model the computational procedure for the central difference method of direct integration is very simple and easy.
流场求解时采用中心差分的有限体积方法对空间通量项进行离散，采用显式推进方法进行时间方向的积分。
The spatial flux terms are discretized by using central difference scheme and the time integration is performed by using explicit scheme in the flow solver.
流场求解时采用中心差分的有限体积方法对空间通量项进行离散，采用显式推进方法进行时间方向的积分。
The spatial flux terms are discretized by using central difference scheme and the time integration is performed by using explicit scheme in the flow solver.
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