Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2006-08-18
Phys. Rev. Lett. 98, 084502 (2007)
Nonlinear Sciences
Chaotic Dynamics
4 RevTeX pgs + 4 color Figures included, 1 figure eliminated second part of the paper completely revised
Scientific paper
10.1103/PhysRevLett.98.084502
Spatial distributions of heavy particles suspended in an incompressible isotropic and homogeneous turbulent flow are investigated by means of high resolution direct numerical simulations. In the dissipative range, it is shown that particles form fractal clusters with properties independent of the Reynolds number. Clustering is there optimal when the particle response time is of the order of the Kolmogorov time scale $\tau_\eta$. In the inertial range, the particle distribution is no longer scale-invariant. It is however shown that deviations from uniformity depend on a rescaled contraction rate, which is different from the local Stokes number given by dimensional analysis. Particle distribution is characterized by voids spanning all scales of the turbulent flow; their signature in the coarse-grained mass probability distribution is an algebraic behavior at small densities.
Bec Jeremie
Biferale Luca
Cencini Massimo
Lanotte Alessandra
Musacchio Stefano
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