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采用ＭＡＣ方法求解原始变量不可压缩非定常带自由面问题的Ｎａｖｉｅｒ－Ｓｔｏｋｅｓ方程，对二维水坝瞬间溃决所产生的溃坝水波进行了数值模拟．计算结果表明，在坝溃决的很短时间范围内，液体运动的任一铅直断面上，均不符合静压分布，自由表面的形状类似一抛物线．
The Navier-Stokes equations of the incompressible unsteady free-surface problem of the original variables are solved by the MAC method, and the dam-break wave generated by the instantaneous collapse of 2D dam is numerically simulated. The calculation results show that the static pressure distribution is not found on any vertical section of the liquid movement within a very short period of dam collapse. The shape of the free surface is similar to a parabola.