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建立了无结构、z坐标网格上的三维悬移质泥沙数学模型,为保证计算的守恒性,泥沙输运方程使用有限体积法求解;为使泥沙模型的求解对水流模型的求解不形成附加的稳定限制条件,泥沙输运方程使用亚循环分步模式离散。使用了垂向亚网格技术,使垂向网格能实时地贴合和追踪自由水面和床面,相对于传统的z坐标网格提高了计算精度;同时,在垂向亚网格技术中,为避免因泥沙冲淤产生的垂向小尺度网格对计算时间步长的限制,提出了垂向网格融合技术对底层网格进行处理。借助直壁复式明渠、异重流潜入的水槽实测资料对模型进行了检验,计算结果与试验资料符合良好。
In order to ensure the conservation of calculation, sediment transportation equation is solved by finite volume method. In order to solve the sediment model, the mathematical model of three-dimensional suspended sediment transport is built on unstructured, z-coordinate grid. No additional stability constraints are formed, and the sediment transport equation is discretized in a sub-cycle fractional pattern. Using vertical sub-grid technology, the vertical grid can fit and track the free water surface and the bed surface in real time, which improves the calculation precision compared with the traditional z-coordinate grid. Meanwhile, in the vertical sub-grid technology In order to avoid the restriction of calculating the time step due to the vertical small scale grid caused by silting erosion and sedimentation, a vertical grid fusion technique is proposed to process the bottom grid. The model was tested by the measured data of sinking channel with straight wall and multiple open channels and infiltrated by different heavy flows. The calculated results are in good agreement with the experimental data.