International audience
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August 20, 2001 (v1)Journal articleUploaded on: December 3, 2022
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2003 (v1)Journal article
International audience
Uploaded on: February 28, 2023 -
2003 (v1)Journal article
The inviscid Burgers equation with random and spatially smooth forcing is considered in the limit when the size of the system tends to infinity. For the one-dimensional problem, it is shown both theoretically and numerically that many of the features of the space-periodic case carry over to infinite domains as intermediate time asymptotics. In...
Uploaded on: February 28, 2023 -
2003 (v1)Journal article
A quantitative relationship is found between the multifractal properties of the asymptotic mass distribution in a random dissipative system and the long-time fluctuations of the local stretching rates of the dynamics. It captures analytically the fine aspects of the strongly intermittent clustering of dynamical trajectories. Applied to a simple...
Uploaded on: December 3, 2022 -
June 10, 2016 (v1)Journal article
International audience
Uploaded on: December 3, 2022 -
2013 (v1)Journal article
International audience
Uploaded on: February 28, 2023 -
January 10, 2017 (v1)Journal article
Motivated by systems in which droplets grow and shrink in a turbulence-driven supersaturation field, we investigate the problem of turbulent condensation in a general manner. Using direct numerical simulations we show that the turbulent fluctuations of the supersaturation field offer different conditions for the growth of droplets which evolve...
Uploaded on: December 4, 2022 -
November 14, 2019 (v1)Publication
The feedback forces exerted by particles suspended in a turbulent flow is shown to lead to a new scaling law for velocity fluctuations associated to a power-spectra $\propto k^{-2}$. The mechanism at play relies on a direct transfer of kinetic energy to small scales through Kelvin--Helmholtz instabilities occurring in regions of high particle...
Uploaded on: December 4, 2022 -
2020 (v1)Journal article
The fragmentation of small, brittle, flexible, inextensible fibers is investigated in a fully-developed, homogeneous, isotropic turbulent flow. Such small fibers spend most of their time fully stretched and their dynamics follows that of stiff rods. They can then break through tensile failure, i.e. when the tension is higher than a given...
Uploaded on: December 4, 2022 -
September 25, 2014 (v1)Journal article
Abstract The phenomenology of turbulent relative dispersion is revisited. A heuristic scenario is proposed, in which pairs of tracers undergo a succession of independent ballistic separations during time intervals whose lengths fluctuate. This approach suggests that the logarithm of the distance between tracers self-averages and performs a...
Uploaded on: December 3, 2022 -
November 23, 2022 (v1)Publication
Protoplanetary disks are gaseous systems in Keplerian rotation around young stars, known to be turbulent. They include a small fraction of dust from which planets form. In the incremental scenario for planet growth, the formation of kilometer-size objects (planetesimals) from pebbles is a major open question. Clustering of particles is...
Uploaded on: December 4, 2022 -
February 2018 (v1)Journal article
The problem of accretion of small particles by a sphere embedded in a mean flow is studied in the case where the particles undergo inelastic collisions with the solid object. The collision efficiency, which gives the flux of particles experiencing at least one bounce on the sphere, is found to depend upon the sphere Reynolds number only through...
Uploaded on: February 27, 2023 -
March 7, 2022 (v1)Journal article
Turbulence is unique in its appeal across physics, mathematics and engineering. And yet a microscopic theory, starting from the basic equations of hydrodynamics, still eludes us. In the last decade or so, new directions at the interface of physics and mathematics have emerged, which strengthens the hope of 'solving' one of the oldest problems...
Uploaded on: December 4, 2022