基于Flow-3D的桥墩冲刷数值研究

发布时间：2024-03-06 01:45

　　桥墩冲刷毁坏是桥梁失事的重要原因,桥墩冲刷深度估算是保障桥梁安全运行的重要保障,准确估算桥墩附近冲刷形态及冲刷深度对于桥梁安全运行具有重要意义。论文基于FLOW-3D软件,采用RNG6)-模型和大涡模拟(LES)模型,结合Meyer-Peter和Van Rijn的推移质输沙率公式,对单柱桥墩和双柱桥墩附近的绕流流态及冲刷过程进行了三维数值模拟,并与Melville试验结果进行了分析对比,主要研究内容及结果如下:(1)从单柱桥墩最大局部冲刷坑深度模拟结果来看,分别采用RNG6)-模型和大涡模拟(LES)模型对桥墩冲刷情况进行了模拟计算。结果表明,RNG k-ε模型计算出的最大冲深与Melville的实验结果相差23.5%,LES大涡模拟计算值与Melville的实验结果相差15.4%,显然,LES大涡模拟计算结果比RNG k-ε模型的计算结果更加贴合实际情况。(2)选用LES大涡模拟,对Meyer-Peter公式、van Rijn公式的适用性进行了评价。由Meyer-Peter公式计算出的冲坑形态、范围、冲刷时间及最大冲坑深度与Melville实验结果的吻合程度均较好;由van Rijn...

【文章页数】：71 页

【学位级别】：硕士

【文章目录】：
摘要
ABSTRACT
CHAPTER 1 INTRODUCTION
    1.1 Background
    1.2 Literature Review
        1.2.1 The local scour at bridge pier
    1.3 Objectives, Subjects, and Significance
        1.3.1 Research objectives
        1.3.2 Research significance
        1.3.3 Limitations and scope of research
    1.4 Organization of Final Year Thesis
CHAPTER 2 MATERIALS AND METHODS
    2.1 Numerical Model
        2.1.1 Introduction of CFD
        2.1.2 Turbulence Models
    2.2 Sediment scour model
    2.3 Case study
CHAPTER 3 RESULTS AND DISCUSSION
    3.1 Single Column
        3.1.1 The application of Meyer-Peter Bedload transport equation
        3.1.2 The Application of van Rijn Bedload Transport Equations
        3.1.3 Influence of Flow Velocity
    3.2 Double column
        3.2.1 Flow Field Verification
        3.2.2 Verification of Scour Depth Prediction
        3.2.3 Scour Shape Verification
        3.2.4 Influence of pier-shape
    3.3 Summary
CHAPTER 4 CONCLUSIONS AND RECOMMENDATIONS
    4.1 Conclusion
    4.2 Outlook and Recommendations
REFERENCES
APPENDICES
ACKNOWLEDGEMENTS
AUTHOR BIOGRAPHY



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