Dynamics of towed particles in a turbulent flow

Obligado, Martín; Bourgoin, Mickaël

doi:10.1016/j.jfluidstructs.2022.103704

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…However, given its simplicity, the point-particle model could not account precisely for the feedback of particles on the surrounding flows in general situations, such as the particle boundary layer and the wake behind it (Jiang et al 2022). To this end, the finite-size particles, typically with diameters larger than the dissipation length scale η of the surrounding turbulent flows (Voth & Soldati 2017;Mathai et al 2020;Brandt & Coletti 2022), have been a vigorous field in recent years, in both experiments (Qureshi et al 2007(Qureshi et al , 2008Fiabane et al 2012;Will et al 2021;Will & Krug 2021a,b;Obligado & Bourgoin 2022) and numerical simulations (Calzavarini et al 2009;Picano, Breugem & Brandt 2015;Peng, Ayala & Wang 2020;Yousefi, Ardekani & Brandt 2020;Assen et al 2022;Demou et al 2022;Li, Xia & Wang 2022). In particular, by numerically implementing no-slip boundary conditions on their surface, the finite-size particles are capable of modelling the particle dynamics Jiang et al 2022) and the resulting turbulence modulation (Ardekani et al 2017;Wang, Sierakowski & Prosperetti 2017b;Ardekani & Brandt 2019).…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on turbulence modulation of finite-size particles in plane-Couette flow

Wang,

Jiang,

Sun

2023

J. Fluid Mech.

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Turbulent plane-Couette flow suspended with finite-size spheroidal particles is studied using fully particle-resolved direct numerical simulations. The effects of particle aspect ratio on turbulent arguments and particle statistics are explored, leading to the same conclusions as the previous experimental findings (Wang et al., J. Fluid Mech., vol. 937, 2022, A15). By performing stress analysis, we find that the presence of particles introduces extra stresses to the system and accounts for the global drag increases. The particle-laden flow cases exhibit spectra that are consistent with the scalings $k^{-5/3}$ and $k^{-3}$ in the large and small scales, respectively. While the $k^{-3}$ scaling observed in the particle-laden flow is reminiscent of bubbly flow, an examination of the particle Reynolds number suggests that the mechanism responsible may not be attributable to the pseudo-turbulence induced by particles as in the case of bubbles. In the view of particle statistics, we observe that spherical and non-spherical particles cluster preferentially in the near-wall and the bulk region, respectively, and that the orientations of non-spherical particles are affected by their aspect ratios, especially in the near-wall region. The present numerical results, combined with previous experimental findings in Wang et al. (J. Fluid Mech., vol. 937, 2022, A15), provide in-depth information on both the fluid and the particle phase, contributing to a better understanding of particle suspension in shear flows.

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Section: Introductionmentioning

confidence: 99%

“…2012; Will et al. 2021; Will & Krug 2021 a , b ; Obligado & Bourgoin 2022) and numerical simulations (Calzavarini et al. 2009; Picano, Breugem & Brandt 2015; Peng, Ayala & Wang 2020; Yousefi, Ardekani & Brandt 2020; Assen et al.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on turbulence modulation of finite-size particles in plane-Couette flow

Wang,

Jiang,

Sun

2023

J. Fluid Mech.

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On the settling of a spherical particle in slightly perturbed ambient fluid

Catalán,

Moriche,

Flores

et al. 2024

Acta Mech

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Direct numerical simulations of the settling of a spherical particle under the action of gravity in a slightly perturbed ambient fluid have been performed. The ambient perturbations are generated using a synthetic turbulence inflow generator method, and their length scale and intensity are varied to study their influence on the particle motion. The Galileo number is 151 and the solid-to-fluid density ratio is 1.5, so that in the absence of perturbations, the particle settles following a steady vertical trajectory. It has been found that the ambient perturbations trigger the formation of double-threaded vortical structures in the wake of the particle. These structures resemble those that appear in the oblique oscillating regime that is found in the absence of perturbations at higher Galileo numbers. Due to the flow perturbations the particle is pushed randomly in all directions, and this results in a combination of slow lateral drifts along fixed directions and relatively fast excursions in random directions. The particle response has been characterized using probability density functions of the velocity in the cross-plane and persistence probability. The slow drifts are strongly influenced by the size of the perturbations and by the rotational motion of the particle, while the intensity of the perturbations seems to play a minor role.

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