Attraction of neutrally buoyant deformable particles towards a vortex

Fujiki, Yutaro; Awai, Hideto; Motoori, Yutaro et al.

Physical Review Fluids, 2024, 9(1), 014301

アクセス数:395件（2025-08-01 00:17 集計）

固定URL: https://hdl.handle.net/11094/100038

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タイトル
Attraction of neutrally buoyant deformable particles towards a vortex
著者
著者名
Fujiki, Yutaro
著者名
Awai, Hideto
NRID
1000020906911 1000020906911
ORCID
0000-0002-9647-9014 0000-0002-9647-9014
researchmap permalink
motoori motoori
Scopus Author ID
57207259800 57207259800
著者名
Motoori, Yutaro
NRID
1000040321616 1000040321616
ORCID
0000-0001-7013-7967 0000-0001-7013-7967
researchmap permalink
read0193841 read0193841
Scopus Author ID
56040611400 56040611400
著者名
Goto, Susumu
内容
Fujiki Y., Awai H., Motoori Y., et al. Attraction of neutrally buoyant deformable particles towards a vortex. Physical Review Fluids 9, 014301 (2024); https://doi.org/10.1103/PhysRevFluids.9.014301.
抄録
We conduct direct numerical simulations (DNS) by the full Eulerian finite difference method of a neutrally buoyant hyperelastic particle in Taylor-Green vortical flow. We investigate the case that the initial shape of the particle is spherical with a diameter comparable with the vortex radius. The particle orbit depends on the degree of its deformation due to the flow. When the particle is stiffer (i.e., the capillary number Ca is smaller than about 0.1), the particle is hardly deformed and slowly swept out from the vortex. In contrast, softer particles with Ca≳0.1 are significantly deformed, in an initial period, and they are attracted towards the vortex; then, afterward, the deformation is relaxed so that they can stay around the vortex center. Such an attraction of anisotropic neutrally buoyant particles towards a vortex occurs, even if particles are rigid. We demonstrate this phenomenon by additional DNS of a rigid prolate spheroidal particle in the vortical flow. We also develop analytical arguments to show that the angle between the major axis of the particle and the pathline determines whether the vortex attracts or repulses the particle. This feature well explains the radial motion of neutrally buoyant elastic particles in vortical flow.
出版者
American Physical Society
収録物名
Physical Review Fluids
巻(号)
9(1)
ページ
014301
刊行年月
2024-01-04
言語
英語
ハンドルURL
https://hdl.handle.net/11094/100038
eISSN
2469990X
関連情報 (isIdenticalTo)
DOI (出版社版)
https://doi.org/10.1103/PhysRevFluids.9.014301
アクセス権
open access
権利情報
Copyright 2024 by the American Physical Society
出版タイプ
Version of Record
カテゴリ
学術雑誌論文 Journal Article