IMECH-IR  > 力学所知识产出(1956-2008)
Re=200时圆柱绕流尾迹转捩的非线性特征
熊俊; 凌国灿; 朱克勤
Source Publication第五届全国水动力学学术会议暨第十五届全国水动力学研讨会文集
2001
Pages36-43
Conference Name第五届全国水动力学学术会议暨第十五届全国水动力学研讨会
Conference Date2001-6-30
Conference Place中国北京
Abstract本文以三维不可压缩的N—S方程为数学模型,使用混合谱-谱元法对均匀圆柱绕流作直接数值模拟,研究了Re=200时尾迹转捩过程中的流场特征。N—S方程的时间离散采用基于混合刚性稳定格式的高阶分裂算法。数值计算结果表明,Re=200时近尾迹流场处于三维准周期层流状态。由于尾迹二次不稳定性的发展,尾迹中出现不同波长的展向模态。流场中这些不稳定性模态之间存在非线性相互作用。占优的展向模态的波长还受计算域的展向特征长度和初始时刻有限幅值扰动的影响。对流场中特征位置处展向涡量的时间序列的FFT分析证实了卡门涡脱落时存在展向相位差异,并指出这种相位差异决定于占优的展向模态。
Keyword圆柱尾迹 转捩 直接数值模拟
Department力学所
Language中文
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/48133
Collection力学所知识产出(1956-2008)
Recommended Citation
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熊俊,凌国灿,朱克勤. Re=200时圆柱绕流尾迹转捩的非线性特征[C]第五届全国水动力学学术会议暨第十五届全国水动力学研讨会文集,2001:36-43.
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