VOF模型在有支流汇入的河道复杂流场中的应用

采用VOF模型对大渡河与楠桠河交汇处的护堤工程区及其影响范围进行了三维数值模拟计算分析.结果表明:楠桠河与大渡河交汇口处的流态主要受大渡河流态的影响.护堤工程扩建后,断面平均流速在局部的增大,会增加对河岸的冲刷,因此在护堤建设过程中,应加强固岸措施.工程现场的原位试验观察与模拟计算结果吻合较好,加之工程多年来的安全运行,均说明VOF模型是一种处理复杂自由表面的有效方法,可在天然河道,特别是在有支流汇入的复杂河道流场研究中推广应用.

Application of VOF model to complex flow field of river channel with branch afflux

VOF model was applied to 3D numerical simulation and calculation of the dike dam project at the confluence of Daduhe River and Nanyahe River and its influencing regions.The result shows that the flow pattern at the confluence is mainly affected by that of Daduhe River.After the extension of the dike dam project,the local mean flow velocity in the cross-section will increase,and the scouring against the river bank will intensify,therefore,the bank protection measures should be taken during the construction of the dike dam project.The agreement of the result of field experiments with that of calculation and long-term safe operation of the project demonstrates that VOF model is an effective method to deal with the complex free surface,and it can also be applied to study of natural river channels,especially the complex flow field of river channle with branch afflux.