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本文以静水压强假定下的不可压缩三维非恒定雷诺方程和K—ε双方程湍流模式为基本方程,模拟充分混合的潮汐河口中三维流速分布和水位随时问的变化过程.引入无尺度垂向坐标使计算网格能拟合自由表面和床面.对微分方程利用破开算子法求解.通过使用欠松弛技术提高了计算的稳定性.对长江口南港潮汐流场的计算表明,模型能真实地再现潮汐河口中的实际流动.
In this paper, based on the incompressible three-dimensional unsteady Reynolds equation and K-ε turbulence model under the assumption of hydrostatic pressure, the three-dimensional flow velocity distribution and the change of water level over time in a well-mixed tidal estuary are simulated. So that the computational grid can fit the free surface and the bed surface.The differential equation is solved by the breaking operator method.The stability of the calculation is improved by using the under relaxation technique.The calculation of the tidal current field at the south port of the Yangtze Estuary shows that the model can be real Reproduce the actual flow in the tidal estuary.