We can use finite difference method to overcome this difficulty by defining additional external grid points.
我们可以使用有限差分法，通过定义边界外附加的格点来解决这个问题。
The computed flow fields agree well with experimental results. Only one or two grid points are there within the shock transition area.
跨音流场计算结果与实验符合良好，激波只占一两个网格。
It is found that the anisotropic Cartesian grid method can substantially reduce the number of grid points without jeopadizing the accuracy.
数值结果表明各向异性笛卡尔网格法相对于传统的各向同性网格方法能大量节省网格点数量而且与后者具有同样的精度。
If the grid points are different and dense in the interval of the solution, then approximate solution is convergent uniformly to the exact solution.
如果节点在求解区域内互异而且稠密，则近似解一致收敛到精确解。
DEM (Digital elevation Model) is a data set of plane coordinate or longitude, latitude, and elevation of the regular square grid points in some region.
数字高程模型(DEM)是一定区域范围内规则格网点的平面坐标及其高程的数据集或者是经、纬度和海拔高度的数据集。
Background error covariance is an important part of variational data assimilation system, which is used to spread the observation information to other grid points and vertical levels of the model.
背景误差协方差是变分资料同化系统中的一个重要组成部分，能将观测信息从观测点传播到周围的模式格点和垂直层上。
Background error covariance is an important part of variational data assimilation system, which is used to spread the observation information to other grid points and vertical levels of the model.
背景误差协方差是变分资料同化系统中的一个重要组成部分，能将观测信息从观测点传播到周围的模式格点和垂直层上。
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