Rotational dynamics of bottom-heavy rods in turbulence from experiments and numerical simulations

Linfeng Jiang Tsinghua University Cheng Wang Tsinghua University Shuang Liu Tsinghua University Chao Sun Tsinghua University Enrico Calzavarini Université de Lille

Fluid Dynamics and Shock Waves mathscidoc:2205.14013

Theoretical and Applied Mechanics Letters, 11, 2021.1
We successfully perform the three-dimensional tracking in a turbulent fluid flow of small axisymmetrical particles that are neutrally-buoyant and bottom-heavy, i.e., they have a non-homogeneous mass distribution along their symmetry axis. We experimentally show how a tiny mass inhomogeneity can affect the particle orientation along the preferred vertical direction and modify its tumbling rate. The experiment is complemented by a series of simulations based on realistic Navier-Stokes turbulence and on a point-like particle model that is capable to explore the full range of parameter space characterized by the gravitational torque stability number and by the particle aspect ratio. We propose a theoretical perturbative prediction valid in the high bottom-heaviness regime that agrees well with the observed preferential orientation and tumbling rate of the particles. We also show that the heavy-tail shape of the probability distribution function of the tumbling rate is weakly affected by the bottom-heaviness of the particles.
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@inproceedings{linfeng2021rotational,
  title={Rotational dynamics of bottom-heavy rods in turbulence from experiments and numerical simulations},
  author={Linfeng Jiang, Cheng Wang, Shuang Liu, Chao Sun, and Enrico Calzavarini},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220517144950070624229},
  booktitle={Theoretical and Applied Mechanics Letters},
  volume={11},
  year={2021},
}
Linfeng Jiang, Cheng Wang, Shuang Liu, Chao Sun, and Enrico Calzavarini. Rotational dynamics of bottom-heavy rods in turbulence from experiments and numerical simulations. 2021. Vol. 11. In Theoretical and Applied Mechanics Letters. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220517144950070624229.
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