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We present the results of a Direct Numerical Simulation of a particle-ladenspatially developing turbulent boundary layer up to Re{\theta} = 2500. Two mainfeatures differentiate the behavior of inertial particles in a zero-pressure-gradient turbulent boundary layer from the more commonly studied caseof a parallel channel flow. The first is the variation along the streamwisedirection of the local dimensionless parameters defining the fluid-particle in-teractions. The second is the coexistence of an irrotational free-stream and anear-wall rotational turbulent flow. As concerns the first issue, an inner andan outer Stokes number can be defined using inner and outer flow units. Theinner Stokes number governs the near-wall behavior similarly to the case ofchannel flow. To understand the effect of a laminar-turbulent interface, we ex-amine the behavior of particles initially released in the free stream and showthat they present a distinct behavior with respect to those directly injectedinside the boundary layer. A region of minimum concentration occurs inside theturbulent boundary layer at about one displacement thickness from the wall. Itsformation is due to the competition between two transport mecha- nisms: arelatively slow turbulent diffusion towards the buffer layer and a fastturbophoretic drift towards the wall.

Statistics of particle accumulation in spatially developing turbulent boundary layers