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ファイル | 記述 | サイズ | フォーマット | |
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PhysRevFluids.6.033301.pdf | 2.72 MB | Adobe PDF | 見る/開く |
タイトル: | Impact-induced hardening in dense frictional suspensions |
著者: | Pradipto Hayakawa, Hisao ![]() ![]() ![]() |
著者名の別形: | 早川, 尚男 |
キーワード: | Non-Newtonian fluids Suspensions Lattice-Boltzmann methods Molecular dynamics Polymers & Soft Matter |
発行日: | Mar-2021 |
出版者: | American Physical Society (APS) |
誌名: | Physical Review Fluids |
巻: | 6 |
号: | 3 |
論文番号: | 033301 |
抄録: | We numerically study the impact-induced hardening in dense suspensions. We employ the lattice Boltzmann method and perform simulations of dense suspensions under impacts, which incorporate the contact between suspended particles with the free surface of the suspension. Our simulation for a free-falling impactor on a dense suspension reproduces experimental results, where rebound takes place for frictional particles at high-speed impact and high volume fraction shortly after the impact before subsequently sinking. We found that the shear stress of the suspension is not affected by the impact, which clearly distinguishes the impact-induced hardening from the discontinuous shear thickening. Instead, we found the existence of a localized region with distinctively high value of normal stress corresponding to the dynamically jammed region. Our simulation indicates that the frictional interaction between suspended particles is important for the impact-induced hardening to maintain the dynamically jammed region. Furthermore, persistent homology analysis successfully elucidates the topological structure of force chains. |
著作権等: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. |
URI: | http://hdl.handle.net/2433/274759 |
DOI(出版社版): | 10.1103/PhysRevFluids.6.033301 |
出現コレクション: | 学術雑誌掲載論文等 |
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