Numerical Dissipation Effects on Massive Separation Around Tandem Cylinders

Numerical Dissipation Effects on Massive Separation Around Tandem Cylinders
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串联圆柱体周围大规模分离的数值耗散效应

DOI:
10.2514/1.j051299
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发表时间:
2012-08
期刊:
影响因子:
2.5
通讯作者:
Fu Song
Fu Song
中科院分区:
工程技术3区
文献类型:
--
作者:
Xiao Zhixiang;Liu Jian;Huang Jingbo;Fu Song

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三种空间格式,即原始 Roe 格式和两种高阶对称全变分递减格式,其耗散乘以常数参数或函数(称为 ),与延迟分离涡模拟相结合,研究串联圆柱体周围大量分离流的数值耗散效应。从计算和可用测量之间的比较来看,数值耗散对平均流场和瞬时流场有显着影响。原始的 Roe 方案耗散太大,无法预测小尺度湍流结构,并且强烈抑制已解析湍流的增长。具有恒定和自适应耗散时间的 S6WENO5 方案具有相似的性能,并且与测量结果非常匹配。然而,耗散常数倍(这里为0.12)的S6WENO5过于经验化,小的耗散常数倍通常不能抑制近壁和远场的数值振荡。具有自适应耗散功能的 S6WENO5 可提供最佳性能。
Three spatial schemes, the original Roe scheme and two high-order symmetric total variation diminishing schemes,whose dissipations aremultiplied by a constant parameter or a function (called ), are coupledwith delayed detached eddy simulation to investigate the numerical dissipation effects on the massive separation flow around tandem cylinders. From the comparisons between the computations and the available measurements, the numerical dissipation has a significant influence on the mean and instantaneous flowfields. The original Roe scheme is too dissipative to predict the small scale turbulent structures, and it strongly suppresses the growth of resolved turbulence. The S6WENO5 schemes with constantand adaptivetimes of dissipation have similar performances and they well match the measurements. However, the S6WENO5 with constanttimes (0.12 here) of dissipation is too empirical, and the small constanttimes of dissipation cannot generally suppress the numerical oscillations near the wall and in the far fields. The S6WENO5 with adaptive dissipation provides the best performance.
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