这一模型的特点只需要知道边界上的基本边界条件和自然边界条件，就可以得到边界上所需要求的流函数和水流速度；
The characteristic of this model is only to know basic and natural boundary condition, then the stream function and flow velocity required on the boundary are obtained.
介绍勒让德方程在自然边界条件下的解，重点推导了勒让德函数的系数。
The solution of Legendre equation has been introduced in the condition of natural limit and the emphasis is put on the inference to the coefficient of the Legendre function.
利用Green函数，根据双调和方程边值问题的边界积分公式和自然边界积分方程。
By using Green function, the boundary integral formula and natural boundary integral equation for the boundary value problems of biharmonic equation were obtained.
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