Abstract
In this paper we examine the effect of local shear and turbulence anisotropy on the rotational dynamics of fibers with different elongation and inertia. To this aim, statistics of the fiber angular velocity, Ω, are extracted from Direct Numerical Simulation (DNS) of turbulence at shear Reynolds number Reτ = 150 coupled with Lagrangian tracking of prolate ellipsoidal fibers with Stokes number, St, ranging from 1 to 100 and aspect ratio, λ, ranging from 3 to 50. Results for mean and fluctuating angular velocities show that elongation is important for fibers with small inertia (St ≤ 5 in our flow-fiber combination). They also show that, in the strong shear region (comprised within 50 viscous units from the wall in the present simulations), fiber anisotropy adds to flow anisotropy to induce strong deviations on fiber rotational dynamics with respect to spherical particles.
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