Multi-scale energy transfer in near-wall region of turbulent channel flow

作者：Jia Hongtao^*; Xu Chunxiao; Cui Guixiang

来源：Chinese Journal of Theoretical and Applied Mechanics, 2007, 39(2): 181-187.

• Multiscale energy transfer
• Orthogonal wavelet
• Spanwise direction
• Streamwise direction
• Wall turbulence

The multi-scale energy transfer in near-wall turbulence is studied by orthonormal wavelets and the database of channel turbulence obtained by direct numerical simulation. By a multi-scale decomposition of the flow field in streamwise and spanwise directions, the difference of energy transfer between these two directions is investigated. It is found that the energy transfer in the streamwise direction is dominated by backscattering, while in the spanwise direction, there is an obvious forward transfer, which is not confined in the viscous sublayer only like that in the streamwise direction. With a larger filter width, the forward energy transfer in the spanwise direction becomes dominant.

• 出版日期2007
• 单位清华大学