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用Fluent和HEC-RAS对桥墩周围冲刷的数值研究
| 论文题名： | 用Fluent和HEC-RAS对桥墩周围冲刷的数值研究 |
| 关键词： | 数值模拟;数学模型;桥墩冲刷;计算流体力学 |
| 摘要： | The scour that occurs around a bridge pier founded in erodible bed material is acomplex three-dimensional phenomenon. The analysis and prediction of scour at bridgesis complex. In this study, the relationships among field and numerical studies wereinvestigated. Firstly, numerical modeling of two-phase model with a single cylindrical pier wassimulated by three dimensional CFD module .Then, numerical modeling of four modelswhich are one bridge from Myanmar and three bridges from United State of America,were modeled by one dimensional HEC-RAS module. Finally, the simulated results werecompared with data from field observations and empirical scour prediction formulas byanalytical methods. In 3-D simulation, scour prediction did not reach to the equilibrium conditionbecause of the lack of CPU requirements .Change of velocity magnitudes anddevelopment of scour around pier were found reasonably. In 1-D simulation, reasonableagreement between field and model simulation outputs for velocity distribution and scourdepth upstream of the bridge pier at four different field sites Simulated scour depths areclose to the HEC-18 and Froehlich (1988) formulas at low values of Fr<,1>,and while Fr<,1>continuously increases, the relative scour depths were among the values of HEC-18 andFroehlich (1991) formulas. Smaller sediment size relative to the pier width (larger valuesofb/d〈，50〉)can increase the scour process effectively in all studied cases. |
| 作者： | 马晴晴 |
| 专业： | 港口、海岸及近海工程 |
| 导师： | 张淑华 |
| 授予学位： | 硕士 |
| 授予学位单位： | 河海大学 |
| 学位年度： | 2007 |
| 正文语种： | 中文 |
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