基于FLUENT的丁坝回流区数值模拟

Simulation of the Backflow Zone around Spur Dike Based on FLUENT

利用FLUENT中的k-ε湍流模型和VOF模型,对非淹没的圆头、拐头和梯形丁坝回流区流场进行了数值模拟。首先将文献试验与模型计算进行了对比,结果吻合良好。然后进一步对不同类型丁坝进行了模拟。计算结果表明,不同类型丁坝的坝后回流区范围不同,圆头坝坝后回流区范围最大(涡长和涡宽),拐头坝次之,梯形坝最小。同一丁坝下,随着水深增加,圆头坝和拐头坝坝后回流区范围减小,且越接近水面减小越慢;梯形坝由于有坡度,结果与前两个丁坝结果相反。

The flow field in the backflow zone of the round -head, turn-head and trapezoidal dike has been simulated based on the k-ε and VOF model in fluent. First, comparisons about the simu-lation and experiment are made and the results are good .Further , simulations of different dikes are conducted , it is concluded that the backflow zone of the round -head dike is the largest , that of the turn-head dike is the second , and that of the trapezoidal dike is the third .The range of the back-flow is smaller and smaller with the water depth increasing , and this tend is slow near the surface . The result of the trapezoidal dike is opposite because of the slope .