In this study, the rotation of small rigid fibers relative to the surrounding fluid in wall-bounded
turbulence is examined by means of direct numerical simulations coupled with Lagrangian
tracking. Statistics of the relative (fiber-to-fluid) angular velocity, referred to as slip spin in the
present study, are evaluated by modelling fibers as prolate spheroidal particles with Stokes
number, St, ranging from 1 to 100 and aspect ratio, λ, ranging from 3 to 50. Results are
compared one-to-one with those obtained for spherical particles (λ= 1) to highlight effects …