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LES与DNS粒子轨迹的Lyapunov指数的比较
郭力; 晋国栋; 李栋; 张星; 何国威
Source Publication第七届全国流体力学学术会议论文摘要集
2012
Pages20-20
Conference Name第七届全国流体力学学术会议
Conference Date2012-11-12
Conference Place中国广西桂林
Abstract本文根据LES,DNS和滤波以后的DNS的各向均匀同性湍流场计算了粒子运动的6个Lyapunov指数,用以考察LES与DNS粒子轨迹的差别。当粒子的惯性较大时,(St>1)3种结果得到的Lyapunov指数相近。当粒子惯性较小时,(St<1)3种结果得到的指数各不相同,其中差别最大的点在St约为0.5的区域。对于St数属于0.1到2.0范围内的所有情况,DNS的第一个Lyapunov指数最大,滤波以后的DNS的第一Lyapunov指数(约为0.11)小于DNS(约为0.12),但是大于LES(约为0.1)。前3个Lyapunov指数之和反映了小于Kolmogorov尺度上物理空间体积随时间的变...
Keyword携带粒子的湍流 Les Lyapunov指数
DepartmentLNM湍流
Language中文
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/48610
Collection非线性力学国家重点实验室
Recommended Citation
GB/T 7714
郭力,晋国栋,李栋,等. LES与DNS粒子轨迹的Lyapunov指数的比较[C]第七届全国流体力学学术会议论文摘要集,2012:20-20.
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