带有指数边界层的奇异摄动两点边值问题能在自适应网格上有效解出.这种网格是通过等分布一个区域七的控制函数而产生.选用对方程两阶导数为向前差商的迎风差分格式,对控制函数M(z)取值为√1+(ε^-1e^βrε)^2 利用离散的格林函数可得不依赖于摄动参数e的收敛结果,误差阶和加权误差导数的阶均为O(N^-1).
A singularly perturbed two-point boundary value problem with an exponential boundary layer is solved numerically by using an adaptive grid method. The mesh is constructed adaptively by equidistributing a monitor function over the domain of the problem. In this paper, we choose the forward upwind difference scheme and set M(x) =√1+(ε^-1e^βrε)^2. By using the discrete Green's function,a convergent result which is independent of the perturbation parameter is obtained. The order is O(N^-1 ). And the error bound for the weighted derivative is established. The order is also O( N^-1).