The structure and dynamics of backflow in turbulent channels
J Cardesa, JP Monty, J Soria, MS Chong
Journal of Fluid Mechanics | Cambridge University Press (CUP) | Published : 2019
A statistical description of flow regions with negative streamwise velocity is provided based on simulations of turbulent plane channels in the Reynolds number range. It is found that regions of backflow are attached and their density per surface area - in wall units - is an increasing function of. Their size distribution along the three coordinates reveals that, even though in the mean they appear to be circular in the wall-parallel plane, they tend to become more elongated in the spanwise direction after reaching a certain height. Time-tracking of backflow regions in a simulation showed they convect downstream at the mean velocity corresponding to, they seldom interact with other backflow ..View full abstract
This research was funded in part by the Multiflow project of the European Research Council and the Australian government through the Australian Research Council.