Orthogonal wavelet analysis of counter gradient transport phenomena in turbulent asymmetric channel flow

• 来源期刊: 力学学报（英文版）
• 年，卷（期）: 2005,（2）
• 页码范围: 133-141
• 页数: 9页
• 语种: 英文

摘要

In this paper four families of orthogonal wavelets are applied to analyze the turbulent counter gradient transport phenomena in fully developed asymmetric channel flows,The results show that: (1) In the instance of counter gradient transport, the principal scale of the coherent structure is responsible for the strong local counter gradient transport; (2)Counter gradient transport phenomena have a strong effect on the intermittency of turbulence; (3) Non-Gaussian part of the principal coherent structure is essential for counter gradient transport phenomena.