Turbulent sedimentation: a new form of Rayleigh-Taylor mixing
ORAL
Abstract
The sedimentation of finite-size inertial particles in a Rayleigh-Taylor-like setup is studied by state-of-the-art direct numerical simulations.
The falling particles are observed to produce two distinct regions: a leading mixing layer with a linear concentration profile followed by a bulk region of uniform density.
Unlike classical RT turbulence, the mixing layer extension accelerates with an anomalous, non-integer exponent, while the bulk region moves at a constant velocity.
A one-dimensional model based on a local hindered settling law accurately captures the observed dynamics and its dependence on the density ratio.
The falling particles are observed to produce two distinct regions: a leading mixing layer with a linear concentration profile followed by a bulk region of uniform density.
Unlike classical RT turbulence, the mixing layer extension accelerates with an anomalous, non-integer exponent, while the bulk region moves at a constant velocity.
A one-dimensional model based on a local hindered settling law accurately captures the observed dynamics and its dependence on the density ratio.
*Japan Society for the Promotion of Science is acknowledged (grants 24K17210 and 24K00810). The authors acknowledge the computer time provided by the Scientific Computing & Data Analysis section of the Core Facilities at OIST and by HPCI, under the Research Project grant hp250021.
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Publication: Simone Tandurella, Marco Edoardo Rosti, Stefano Musacchio, Guido Boffetta, "Turbulent sedimentation: a new form of Rayleigh-Taylor mixing", Phys. Rev. Lett. (submitted)
Presenters
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Guido Boffetta
- University of Torino