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2021 (v1)PublicationUploaded on: February 14, 2024
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2002 (v1)Journal article
Active and passive scalars transported by an incompressible two-dimensional conductive fluid are investigated. It is shown that a passive scalar displays a direct cascade towards the small scales while the active magnetic potential builds up large-scale structures in an inverse cascade process. Correlations between scalar input and particle...
Uploaded on: December 3, 2022 -
2007 (v1)Journal article
Physica D Nonlinear Phenomena, 226, pp. 11-22, http://dx.doi.org./10.1016/j.physd.2006.10.007
Uploaded on: December 4, 2022 -
2007 (v1)Journal article
A statistical description of heavy particles suspended in incompressible rough self-similar flows is developed. It is shown that, differently from smooth flows, particles do not form fractal clusters. They rather distribute inhomogeneously with a statistics that only depends on a local Stokes number, given by the ratio between the particles'...
Uploaded on: December 4, 2022 -
2005 (v1)Journal article
The effects of a large-scale shear on the energy spectrum of a passively advected scalar field are investigated. The shear is superimposed on a turbulent isotropic flow, yielding an Obukhov-Corrsin $k^{-5/3}$ scalar spectrum at small scales. Shear effects appear at large scales, where a different, anisotropic behavior is observed. The scalar...
Uploaded on: December 4, 2022 -
2008 (v1)Journal article
Physica D Nonlinear Phenomena, 237, pp. 2037-2050, http://dx.doi.org./10.1016/j.physd..02.022
Uploaded on: December 4, 2022 -
2005 (v1)Journal article
Finite-size impurities suspended in incompressible flows distribute inhomogeneously, leading to a drastic enhancement of collisions...
Uploaded on: December 3, 2022 -
2010 (v1)Journal article
The statistics of velocity differences between pairs of heavy inertial point particles suspended in an incompressible turbulent flow is studied and found to be extremely intermittent. The problem is particularly relevant to the estimation of the efficiency of collisions among heavy particles in turbulence. We found that when particles are...
Uploaded on: December 3, 2022 -
2006 (v1)Journal article
Physics of Fluids, 18, p. 1702, http://dx.doi.org./10.1063/1.2338598
Uploaded on: December 3, 2022 -
2007 (v1)Journal article
Physical Review Letters, 98, p. 84502, http://dx.doi.org./10.1103/PhysRevLett.98.084502
Uploaded on: December 3, 2022 -
2006 (v1)Journal article
Physics of Fluids, 18, p. 1702, http://dx.doi.org./10.1063/1.2349587
Uploaded on: December 3, 2022 -
2006 (v1)Journal article
Journal of Turbulence, 7, p. 36, http://dx.doi.org./10.1080/14685240600675727
Uploaded on: December 4, 2022 -
2006 (v1)Journal article
We present the results of Direct Numerical Simulations (DNS) of turbulent flows seeded with millions of passive inertial particles. The maximum Taylor's Reynolds number is around 200. We consider particles much heavier than the carrier flow in the limit when the Stokes drag force dominates their dynamical evolution. We discuss both the...
Uploaded on: December 3, 2022