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Instabilities of a freely moving spherical particle in a Newtonian fluid: Direct Numerical Simulation

  • Yuxiu Li ORCID logo EMAIL logo , Shashank S. Tiwari ORCID logo , Geoffrey M. Evans , Krishnaswamy Nandakumar and Jyeshtharaj B. Joshi ORCID logo
Published/Copyright: February 8, 2021

Abstract

Direct Numerical Simulations (DNS) were carried out for a freely falling/rising rigid particle in an otherwise quiescent fluid, using a non-Lagrangian multiplier based fictitious domain (FD) method. Validation studies showed that the proposed FD based DNS are in good agreement with the existing experimental results in the transition regime of falling/rising spheres. Simulations done in the transitional regime (50 < Reynolds number (Re) < 1800 and solid-to-fluid density ratios Γ=ρp/ρf from 0.08 to 4), confirmed that (i) a falling spherical particle (Γ = 4) exhibits a helical trajectory in the range 270 < Re < 320, and (ii) a rising particle (Γ = 0.5) shows a zig-zagging trajectory in the same range of Re. This finding closes the uncertainty to the question as to whether or not rising/falling particles exhibit a helical and a zig-zagging trajectory. In addition to this, a total of seven distinctive flow regimes were identified, which are as follows: (I) vertical straight path (II) steady oblique path (III) Wavy oblique path (IV) zig-zagging path (for 0.08 < Γ < 1) (V) helical path (for 1 < Γ < 4) (VI) early transition to chaos and (VII) chaotic regime. Regime IV occurs only for light particles (Γ < 1), whereas Regime V occurs only for heavy particles (Γ > 1). Fast Fourier Transform (FFT) analysis characterized the presence of a bimodal frequency similar to that exhibited by flow past an isolated stationary bluff body.


Corresponding authors: Geoffrey M. Evans, Department of Chemical Engineering, The University of Newcastle, Newcastle, Australia; Krishnaswamy Nandakumar, Department of Chemical Engineering, Louisiana State University, Baton Rouge, USA; and Jyeshtharaj B. Joshi, Department of Chemical Engineering, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga (E), Mumbai, 400019, India, Homi Bhabha National Institute, Mumbai, India; and J. B. Joshi Research Foundation, Mumbai, India, E-mail: (G. M. Evans), (K. Nandakumar), and (J. B. Joshi)

Award Identifier / Grant number: 51776043

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This work was supported by Natural Science Foundation of China (51776043).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/ijcre-2020-0151).


Received: 2020-08-29
Accepted: 2021-01-13
Published Online: 2021-02-08

© 2021 Walter de Gruyter GmbH, Berlin/Boston

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