Shape-dependent regions for inertialess spheroids in turbulent channel flow

The alignment between the inertialess spheroids and directions of fluid Lagrangian stretching or compression is sensitive to particles shape near wall but not center channel [Cui et al. “Alignment statistics rods with direction in a flow,” J. Fluid Mech. 901, A16 (2020)]. This observation further investigated current study uncover mechanism particle behavior different regions flows at Reτ≈180 1000. Meanwhile, by using probability distributions sign discriminant linear term Jeffery equation, we find that turbulent flow can be distinctly divided into strong weak shape-dependent regions. In region, slender (flat) have extraordinarily similar alignments (compression). However, these are shape, especially positions approaching wall. ranges rely on Reynolds number, equation useful tool distinguish turbulence regardless number.