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力学学报  2015 

透水床面明渠湍流时空平均特征的大涡模拟与分析

DOI: 10.6052/0459-1879-14-382, PP. 713-721

Keywords: 湍流,大涡模拟,双平均理论,透水床面

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Abstract:

基于大涡模拟数据,研究了理想粗糙透水床面明渠湍流的时空平均特性.考虑到空间异构性,对比分析了不同位置的时空平均流速、雷诺剪应力、构造剪应力、脉动幅度的垂线分布.结果表明第一,顶层床面之上,空间异构性的影响较小,不同位置的双平均流速符合类似的对数分布,但由于透水床面影响,卡门常数较不透水床面小;在床面附近,空间异构性影响较大,不同位置的双平均流速分别符合线性分布与多项式分布;在透水河床内部,靠近底层球孔的双平均流速为上部球孔双平均流速的1.55倍.第二,床面之上,雷诺剪应力占总剪应力的95%以上,占有主体地位;床面附近,紊动较大,构造剪应力不能忽略,其值大约占总剪应力的15%.由于流场的各向异性,纵向与垂向的脉动幅度有所差异.

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