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用有限元法配合时步处理在时域范围内计算了二阶非线性水波，每一瞬时自由表面上的速度势和波高用Adams外推法和内插法获得，而流场内速度势通过求解有限元方程得到，计算采用四边形等参单元．给出了两个算例．
The second-order nonlinear waterwave was calculated in the time-domain with finite element method and time-step processing. The velocity potential and wave height on the free surface at each instant were obtained by Adams extrapolation and interpolation, and the velocity potential in the flow field was obtained by Solve the finite element equation, the calculation using quadrilateral isoparametric unit. Two examples are given.