Fluent数值模拟重力坝坝基渗流场的准确性分析

Accuracy Analysis of Numerical Simulation in Seepage Field of Gravity Dam Foundation with Fluent

为探明程序中多孔介质模型求解重力坝坝基渗流场问题的准确性,采用基于有限体积法的Fluent数值模拟程序求解坝基渗流场,以半无限深简单地下轮廓线的二维稳定有压渗流场为例,不考虑多物理场耦合时,基于渗流理论,采用理论求解法计算渗流场各测点表征量的精确解,并与Fluent后处理程序输出的相应测点同一表征量的数值模拟结果进行了比较。结果表明,基于有限体积法的数值模拟结果与理论解相比误差在3%以内,可满足工程精度要求。

In order to explore the accuracy of porous module in simulating seepage field of gravity dam foundation, the Fluent of numerical simulation based on finite volume method is used to solve seepage field of dam foundation. Taking numerical simulation of 2D semi-infinite deep steady seepage field of simple underground contour line for an example, without regard to multi-physical filed coupling, exact solutions of each measure point characteristics are calculated with seepage theory. Compared with the simulation results of the same point characteristics obtained by Fluent post-processing pro- gram, it shows that numerical simulation error by porous media module of Fluent based on finite volume method is less than 3% , which meets project required precision .