丁坝绕流流场及局部冲刷三维数值模拟研究

发布时间：2018-06-05 07:40

本文选题：丁坝 + 局部冲刷　；参考：《水动力学研究与进展(A辑)》2017年01期

【摘要】：精确模拟丁坝附近流场信息,预测冲刷形态对丁坝的设计和安全运行具有重要的意义。本文采用一种基于多相流模式的悬移质输沙与传统推移质输沙相结合的模型模拟丁坝局部流场与冲刷过程,而河床变形则通过填充层体积份数的变化来模拟,VOF法处理自由面。泥沙冲刷侵蚀模型主要分为三个模块:悬移质漂流模块、泥沙挟带模块以及推移质输运模块,通过模拟在水流作用下的泥沙运动来预测泥沙侵蚀、对流扩散以及沉积等过程,同时考虑床面坡度对泥沙输运以及临界希尔兹数的影响。模拟得到了丁坝附近局部流场、地形冲淤变化以及冲刷坑形态等,并把计算结果与试验资料进行了对比分析,二者吻合较好,证明该模型能够很好地反映丁坝附近流场信息和床面变形特征。
[Abstract]:It is very important for the design and safe operation of the spur dike to accurately simulate the flow field information and predict the scour shape. In this paper, a model combining suspended sediment transport and traditional bed load transport based on multiphase flow model is used to simulate the local flow field and scour process of spur dikes, while the river bed deformation is simulated by the change of volume fraction of filling layer to simulate the treatment of free surface by VOF method. The sediment erosion model is divided into three modules: suspended drift module, sediment entrainment module and bed load transport module. Sediment erosion, convective diffusion and deposition are predicted by simulating sediment movement under the action of water flow. At the same time, the influence of bed slope on sediment transport and critical Shields number is considered. The local flow field, topographic erosion and deposition change and scour pit shape near the spur dike are obtained by simulation. The calculated results are compared with the experimental data and the results are in good agreement with each other. It is proved that the model can well reflect the information of flow field and deformation characteristics of bed surface near spur dike.
【作者单位】：西安理工大学西北旱区生态水利工程国家重点实验室培育基地;
【基金】：陕西省自然科学基础研究计划(2015JM5201) 国家自然科学基金(51579206)~~
【分类号】：TV863;TV135

【相似文献】