均匀流场中钢管桩基础水动力时域统计特性  

Time-Domain Statistics on Uniform-Current Past Single Circular Pile

作　　者：张显雄 Zhang Xianxiong(Poly Changda Engineering Co.,Ltd.,Guangzhou 510620,China)

机构地区：[1]保利长大工程有限公司,广东广州510620

出　　处：《科学技术创新》2022年第35期139-143,共5页Scientific and Technological Innovation

摘　　要：基于流体力学开源计算平台OpenFoam,采用Wall-Adapting Local Eddy-viscosity(WALE)亚格子应力模型,对圆柱钢管桩基缩尺模型进行了均匀流场绕流的大涡数值模拟(Large Eddy Simualtion, LES),其雷诺数Re=3 900。通过对超过326个涡脱周期的压强时程进行统计,分析了均匀流作用在圆柱钢管桩表面水压力的时间平均值(Time-Averaged)、标准差(Standard Deviation)、偏度(Skewness)和峰度(Kurtosis)等前四阶统计特征,计算了圆柱钢管桩表面压力的相关性与峰值因子(Peak factor)。结果表明:钢管桩圆周表面水压时程的各阶统计量之间并没有直接联系,各阶统计量分别对应不同的圆周绕流场流动特征,非线性水压时程的峰值因子沿圆周呈现出三个分布区间。Based on OpenFoam,the Wall-Adapting Local Eddy-viscosity subgrid model is adopted to analyze the uniform-current filed around a circular pile by means of Large Eddy Simulation.Aimed at scaling the model,the Reynolds number is 3900 in this paper.Statistics have been computed for more than 326 shedding cycles from the time-domain processes.The time-averaged,Standard deviation,Skewness and Kurtosis of the current pressures on the pile are counted,linear correlations and peak factors are calculated.The result shows that there are no direct relations among statistics of each order,different flow features correspond to each statistics,the non-linear peak factors of current pressures are distributed at three ranges aound the circular pile.

关 键 词：均匀流 时域 圆柱桩基 缩尺模型 大涡模拟 

分 类 号：U661.1[交通运输工程—船舶及航道工程]