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In this paper the capabilities of the turbulence-resolving Eulerian-Euleriantwo-phase flow model to predict the suspension of mono-dispersed finite-sizedsolid particles in a boundary layer flow are investigated. Forheavier-than-fluid particles, having settling velocity of the order of the bedfriction velocity, the two-fluid model significantly under-estimates theturbulent dispersion of particles. It is hypothesized that finite-size effectsare important and a correction model for the drag law is proposed. This modelis based on the assumption that the turbulent flow scales larger than theparticle diameter will contribute to the resolved relative velocity between thetwo phases, whereas eddies smaller than the particle diameter will have twoeffects: (i) they will reduce the particle response time by adding asub-particle scale eddy viscosity to the drag coefficient, and (ii) they willcontribute to increase the production of granular temperature. Integratingfinite-size effects allows us to quantitatively predict the concentrationprofile for heavier-than-fluid particles without any tuning parameter. Theproposed modification of the two-fluid model extends its range of applicabilityto tackle particles having a size belonging to the inertial range of turbulenceand allows us to envision more complex applications in terms of flow forcingconditions, i.e. sheet flow, wave-driven transport, turbidity currents and/orflow geometries, i.e. ripples, dunes, scour.

A finite-size correction model for two-fluid Large-Eddy Simulation of particle-laden boundary layer flow