双向嵌套法及其在水力计算中的应用

Numerical method of inter-feedback nesting grid scheme and its application in computational hydraulics

在水力计算数值模拟中 ,计算的网格步长约束着计算精度和工作量 ,计算的范围、计算的网格尺度和计算量总是一对矛盾 .以平面二维水流运动方程为基础 ,兼顾到计算的网格步长、时间步长和计算的范围 ,应用了双向嵌套网格法 .工程算例表明 ,双向嵌套网格法具有减少计算工作量。

The numerical precision and the computation amount are limited by the dimensional steps of grid in the numerical simulation of hydraulics. There is always a conflict existing among the scope of simulation, the schematic dimensional grid steps and the total amount of the numerical simulation. Considering the spatial grid step, the time steps and the scope of numerical simulation, the author gives a general summary about the inter feedback nesting grid scheme for two dimensional hydraulic equations integrated in water depth in this paper. As an application example, the author sets up a numerical model with the inter feedback nesting grid scheme on the basis of the triangular elements method. The results and it show that the method can decrease the computation amount and improve the numerical precision.