Chinese Journal of Theoretical and Applied Mechani ›› 2007, Vol. 23 ›› Issue (2): 181-187.DOI: 10.6052/0459-1879-2007-2-2006-136

• Research paper • Previous Articles     Next Articles

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

Hongtao Jia Chunxiao Xu Guixiang Cui   

  • Received:2006-03-28 Revised:2006-06-01 Online:2007-03-18 Published:2007-03-18

Abstract: 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 back scatter, 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 lager filter width, the forward energy transfer in the spanwise direction becomes dominant.

Key words: orthogonal wavelets, wall turbulence, multi-scale energy transfer