交汇水流三维数值模型

3-D Numerical Model for Confluence Flow

应用显式代数应力模型建立了交汇水流三维数值模型。方程离散采用交错网格上的有限体积法,并采用SIMPLE算法求解,代数方程求解采用TDMA逐行扫描法。针对交汇口几何特征分区进行网格划分,自由水面求解采用VOF方法。应用实测资料对计算结果进行了验证,同时与应用k-ε紊流模型的三维数值计算结果进行了比较。研究结果表明,文中所提出的数值模型可以更好地模拟交汇水流独特的三维流动特性。

Three-dimensional numerical model based upon explicit algebraic stress turbulence model with VOF was developed for the simulation of open-channel subcritical junction-flow. The finite volume method and staggered grid were used to discritize the equations, which were solved with the SIMPLE algorithm. Blocked grid arrangement was used for the complex geometry of the junction. The comparisons between numerical results with the measured data and k -ε model are indicated that the model could simulate with high accuracy the peculiar three dimensional flow characteristic of the confluence flow.