三维紊流模型在丁坝中的应用

Flow simulation of spur dike using 3-D turbulent model

对淹没丁坝水流三维计算进行了研究和探讨,采用标准k-ε模型结合璧面函数的方法,模拟分析了丁坝淹没情况下丁坝附近的流场、紊动能及耗散率的分布,并把计算结果与实验资料进行了对比分析,计算值和实验值符合较好.此外,模型较好地模拟出了丁坝顶端的分离流、坝后回流及回流区横断面上的二次流.

A 3-D turbulent model was developed to simulate flow field around spur dike. In the model, the standard k-ε model and the wall function were adopted. Simulated results of velocity distribution, turbulent kinetic energy and its dissipation rate around a spur dike agree well with the experimental data. Moreover, computational result shows that the model developed can successfully simulate the separate structure of flow at the top of spur dike, circumfluence behind spur dike and secondary flow in the cross-section in the circumfluence area.