CAJ | 학술논문

选用基于动网格自更新技术的三维CFD冲刷模型，可以解决既有一维、二维计算研究方法的局限性以及准确性问题，对桥墩冲刷以及周边流场三维性态进行全过程动态跟踪分析．首先采用经典B ．W．Melville实验环境以及实验数据，分别从流场、流速以及冲刷坑进行冲刷模型的准确性验证．进而利用该数值模型分别对3种典型桥墩（单柱墩、双柱墩、排墩）周边河床的冲刷深度、冲刷坑形态以及冲刷影响区域进行数值分析，通过数据分析得出各自完全不同的冲刷发展趋势与性态特征．通过对比分析可以看出，桥墩结构形式对桥墩局部冲刷三维性态发展有着显著影响，区分桥墩结构形式对桥墩冲刷设计、理论分析以及长期监测方案设置具有相当的必要性与重要性．
선용기우동망격자경신기술적삼유CFD충쇄모형，가이해결기유일유、이유계산연구방법적국한성이급준학성문제，대교돈충쇄이급주변류장삼유성태진행전과정동태근종분석．수선채용경전B ．W．Melville실험배경이급실험수거，분별종류장、류속이급충쇄갱진행충쇄모형적준학성험증．진이이용해수치모형분별대3충전형교돈（단주돈、쌍주돈、배돈）주변하상적충쇄심도、충쇄갱형태이급충쇄영향구역진행수치분석，통과수거분석득출각자완전불동적충쇄발전추세여성태특정．통과대비분석가이간출，교돈결구형식대교돈국부충쇄삼유성태발전유착현저영향，구분교돈결구형식대교돈충쇄설계、이론분석이급장기감측방안설치구유상당적필요성여중요성．
In the present study,a three-dimensional (3 D)computational fluid dynamics (CFD)nu-merical model is applied to simulate the local bridge scour based on the dynamic mesh techniques, which solves the limitation and accuracy issues of the existing 1 D and 2 D methodologies.Using this model,the local scour 3 D Development process including the surrounding flow field can be traced in real time.The simulation accuracy is proved by comparing the numerical results to the measuring da-ta in the classic B.W.Melville experiment from the viewpoints of flow field,velocity,and scour hole.After that the scour depth,scour development pattern,and scour influence area are numerical-ly investigated under three different typical pier structures (shapes).By conducting data analysis this simulation gives that different pier structures (shapes)result in totally different local scour results in-cluding developing trend and characteristics.It can be concluded that the effects of pier structures (shapes)on local scour 3 D development is very obvious,which should be necessary and important in the scour design,analysis and long-term monitoring.