Issue |
EPL
Volume 145, Number 4, February 2024
|
|
---|---|---|
Article Number | 43001 | |
Number of page(s) | 7 | |
Section | Fluid and nonlinear dynamics | |
DOI | https://doi.org/10.1209/0295-5075/ad2d15 | |
Published online | 15 March 2024 |
Accelerations of large inertial particles in turbulence
1 New Cornerstone Science Laboratory, Center for Combustion Energy, Key Laboratory for Thermal Science and Power Engineering of MoE, Dept. of Energy and Power Engineering, Tsinghua University - 100084 Beijing, China
2 Physics of Fluids Group, University of Twente - 7500 AE Enschede, The Netherlands
3 Université de Lille, Unité de Mécanique de Lille - J. Boussinesq (UML) ULR 7512 - F-59000 Lille, France
Received: 27 October 2023
Accepted: 26 February 2024
Understanding the dynamics of material objects advected by turbulent flows is a long-standing question in fluid dynamics. In this perspective article we focus on the characterization of the statistical properties of non-interacting finite-sized massive spherical particles advected by a vigorous turbulent flow. We study the fluctuations and temporal correlations of particle accelerations and explore their behaviours with respect to the particle size and the particle mass density by means of fully resolved numerical simulations. We observe that the measured trends cannot be interpreted as the simple multiplicative combination of the two dominant effects: the spatial filtering of fluid accelerations and the added-mass–adjusted fluid-to-particle density ratio. We argue that other hydrodynamical forces or effects, e.g., preferential flow sampling, have still a significant role even at the largest particle sizes, which reach here the integral scale of turbulence.
© 2024 EPLA
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