Vortex configuration in turbulent flows of a (a) Newtonian fluid and (b) dilute polymer solution revealed by the percolation analysis. Our recent work showed that for high-levels of polymer additive-induced turbulent drag reduction, the vortex dynamics become fundamentally changed.
Keywords: non-Newtonian fluids; turbulence; computational fluid dynamics (CFD); direct numerical simulation (DNS)
Reprinted with permission from
Lu Zhu, Hecke Schrobsdorff, Tobias M. Schneider, and Li Xi, “Distinct transition in flow statistics and vortex dynamics between low- and high-extent turbulent drag reduction in polymer fluids”, Journal of Non-Newtonian Fluid Mechanics, 262, pp. 115-130, 2018 (DOI: 10.1016/j.jnnfm.2018.03.017).
Copyright (2018) Elsevier.