Meanwhile, a new method for computing the boundary integration is proposed in free surface seepage field.

同时对有自由面渗流的自由面边界积分问题，提出了一种新的算法。

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When considering body-force, free item will be arised in the equation of the boundary element method, causing boundary integration to be changed into nonlinear-integration.

边界元法在考虑体积力时要产生积分自由项，这将使边界积分成为非线性积分，从而引起实施时的困难。

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Theoretically the numerical solution of Poisson's equation or Laplace's equation plus Neumann boundary condition calculated by the boundary integration method is not unique.

使用边界积分方法求解已知第二类边界条件的拉普拉斯方程或泊松方程时，理论上解是不唯一的。

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