The contribution of active and inactive structures to the statistics of a turbulent pipe flow

What is it about?

In a recent paper of ours (https://goo.gl/zXypV2), we have introduced a new eduction method for the visualization of near-wall structures based on the one-point structure tensors. This work led us to identifying new structures in the extreme vicinity of the wall, the "vorticity crawlers". In the present paper, we use conditional averaging to help discern the separate contributions of active and inactive structures (vorticity crawlers) to the turbulence statistics of near-wall turbulence in fully-developed pipe flow.

Featured Image

Why is it important?

It is quite interesting to be able to see how turbulence statistics (including pressure correlations) are arising due to the combined effects of the various types of near-wall turbulence structures. We expect this to have an impact on turbulence modeling for near wall flows, especially on structure-based models and their variants.

Perspectives