Lihao Zhao

TL;DR: In this paper, the authors report on the pronounced turbulence modulations and the accompanying drag reduction observed in a two-way coupled simulation of particle-laden channel flow and support the view that drag reduction can be achieved not only by means of polymeric or fiber additives but also with spherical particles.

TL;DR: The effects of particle inertia, particle shape, and fluid shear on particle rotation are examined using direct numerical simulation of turbulent channel flow to find patterns that are mostly ascribed to preferential orientations of the spheroids.

TL;DR: In this article, the physical mechanisms involved in particle-fluid interactions were analysed in detail, and it was observed that the fluid transferred energy to the particles in the core region of the channel whereas the fluid received kinetic energy from the particle in the wall region.

TL;DR: The rotational and translational dynamics of oblate spheroidal particles suspended in a directly simulated turbulent channel flow have been examined in this article, where it was shown that the rotational inertia about the symmetry axis of the disk-like particles hampered the spin-up of the flattest particles to match the mean flow vorticity.

TL;DR: In this paper, the slip velocity between rigid fibers and a viscous carrier fluid is investigated for the reference case of turbulent channel flow, and the statistical moments of the slip velocities are evaluated modelling fibers as prolate spheroids with Stokes number, St, ranging from 1 to 100 and aspect ratio, λ, from 3 to 50.