长江感潮河段平面二维潮流数值模拟

基于正交曲线网格下的有限体积法,建立河口潮汐的水深平均二维模型,运用Simple算法求解河口潮汐的二维浅水方程。以长江下游江阴水道为计算实例,用"露滩冻结"动边界技术处理方法模拟江阴水道二维潮流场,较好地解决了边滩、浅滩边界随水位的变动问题。实例和验证结果表明:计算的潮位和潮流过程与实测过程吻合较好,计算的流场合理。对计算结果的前后可视化处理,采用AutoCAD的DXF数据接口生成流场和网格图,以便更好地进行直观分析。

Numerical solution of 2-D tidal flow of the estuary in the Yangtze River

A depth-averaged 2-D numerical model for unsteady tidal flow in estuaries is established based on the finite volume method on orthogonal curvilinear grid.The 2-D shallow water equations are solved by the SIMPLER algorithm technique.Taking Jiangyin waterway of the Yangtze River as a study example,we apply the moving boundary and "condensation" technique to the numerical simulation of the two-dimensional tide flow and solve the problem of mobile boundary with the water level.The calculation and its verification show that the calculated processes of tidal level and current coincide fairly well with the field data,and the flow field of calculation is reasonable.The depth averaged velocity data and grid data are transformed to colorized velocity profile in AutoCAD for intuitive analysis.