对流过程采用逆风-中心差分格式求解；
The first is a convective problem, and solved by the central-upwind deference scheme;
对流项用迎风—中心差分格式模拟，压力方程用SOR法迭代求解。
The convection term is discretized with upwind-central difference scheme, while the pressure equation is solved by SOR.
研究还发现振荡流场长期输运作用数值模拟适用迎风差分格式，而不适用中心差分格式。
In addition, this study has discovered that the up-wind differencing but not the central differencing is fit to simulate the long-term transport of the oscillatory current.
与普通的二阶中心差分格式相比，该格式具有在不增加存储量的前提下提高计算精度的优点。
It is shown that the new scheme has the virtue of high precision without increasing memory requirement compared to two-order center scheme.
利用土壤水分迁移方程和热传导方程，采用中心差分格式并在一定假设前提下建立起冻土水热耦合迁移数学模型。
Based on the basic equations of simultaneous soil water and heat transfer during soil freezing, the coupled equation of moisture and heat is deduced.
由于对流为主的弥散方程具有双曲性质，中心差分格式虽然关于空间步长具有二阶精度，但会产生数值弥散和非物理力学特性的数值振荡，使数值模拟失真。
Due to the hyperbolic properties of convection-dominate dispersion equations, the central difference formula often cause numerical dispersion and oscillation even it has two-order precision in space.
本文根据非线性运动波法理论，介绍了四点非中心隐式有限差分格式模拟城市雨水管网的技术。
Based on the non-linear kinematic wave method, a technique using the four point, excentric, implicit, finite-difference numerical scheme to simulate the urban storm sewer system is introduced.
根据相应物理量的特性，在中心附近进行边界延拓，使得内点的高精度差分格式可以同样应用在网格中心附近，从而无需单侧差分格式，保持了一致的高阶精度。
Based on the characteristics of the physical variables, the boundary near centerline is extended so that a high order finite difference scheme can be utilized as at inner mesh points.
根据相应物理量的特性，在中心附近进行边界延拓，使得内点的高精度差分格式可以同样应用在网格中心附近，从而无需单侧差分格式，保持了一致的高阶精度。
Based on the characteristics of the physical variables, the boundary near centerline is extended so that a high order finite difference scheme can be utilized as at inner mesh points.
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