【作者】 杜升涛； 梁丙臣； 鲁有祥；

【Author】 DU Sheng-tao;LIANG Bing-chen;LU You-xiang;Engineering College,Ocean University of China;

【机构】 中国海洋大学工程学院；

【摘要】 在沙质床面结构物基础的局部冲刷中,结构物的几何参数对冲刷有较大的影响作用。文章首先用已发表的物理模型试验对CFD软件进行了流速场、冲刷深度和冲刷范围的验证,验证结果显示二者具有较好的一致性。然后选取高径比小于1的淹没式箱形结构物,应用CFD数值模拟对稳流条件下结构物基础的局部进行了研究。通过设置不同水深、高径比,研究了水深和高径比对局部冲刷的影响,并分析了箱形结构物的局部冲刷机理。冲刷过程首先从结构物两侧的尖角处开始,并逐渐扩大到基础前方和两侧,冲刷坑深度在尖角处最大。研究发现水深与结构物高度的比值达到4.5时,水深不再是冲刷的影响因素;而小于这一比值时,冲刷范围和最大冲刷深度随比值的增大而增加。高径比增大时,基础前面的冲刷范围和冲刷深度均会增加,基础后方冲刷深度则有一定程度的减小。更多还原

【Abstract】 The geometric parameters of the structure have a great influence on the erosion of the sand bed.In this paper,the flow field,the scour depth and its ranges of the CFD software are verified by the physical model test,and the results show that they have good consistency.Then,the ratio of height to diameter that is less than 1 is selected to study the local sour of the submerged caisson.In this process,a CFD software for numerical simulations is chosen.The effects of water depth and height diameter ratio on local scour are studied by setting different water depth and height to diameter ratios.In the meantime,the local scour mechanism of caisson is analyzed.It finds that the scouring process is always beginning from the sharp points on both sides of the structure,and gradually extends to the front and sides of the foundation.When the ratio of water depth to structural height reaches 4.5,the depth of water is no longer the influence factor of erosion.If the ratio is smaller,the scour range and maximum scour depth increase with the ratio.When the ratio of height to diameter increases,the scour range and scour depth will increase accordingly,but the scour depth will decrease to some extent.更多还原