Forward and backward multi-particle dispersion in homogeneous isotropic turbulence
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- ARAKAWA Ryunosuke
- Graduate School of Engineering, Nagasaki University
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- KITAMURA Takuya
- Graduate School of Engineering, Nagasaki University
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- SONOBE Yohei
- Graduate School of Engineering, Nagasaki University
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- SAIMOTO Akihide
- Graduate School of Engineering, Nagasaki University
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- NANRI Takeshi
- Research Institute for Information Technolgy, Kyushu University
Bibliographic Information
- Other Title
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- 一様等方性乱流における前進および後退多粒子拡散
Description
<p>Turbulent diffusion in homogeneous isotropic turbulence is numerically investigated using the direct numerical simulation (DNS). The four-dimensional turbulence database allows us to track fluid particles not only in the forward direction of time but also in the backward direction. Two-particle dispersion has been studied in previous studies and it is known that backward diffusion is faster than forward diffusion. However, little is known about multi-particle dispersion due to the difficulty of observing it experimentally. Studies on backward diffusion are also limited. In this study, multi-particle dispersion is numerically investigated and its properties are discussed, e.g., direction of time and geometry of a tetrahedron. The results show that forward and backward diffusions of multi-particles behave differently at the beginning and evolve similarly after the transient time, but the coefficients of the backward direction are larger than those of the forward direction.</p>
Journal
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- Transactions of the JSME (in Japanese)
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Transactions of the JSME (in Japanese) 90 (929), 23-00281-23-00281, 2024
The Japan Society of Mechanical Engineers
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Keywords
Details 詳細情報について
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- CRID
- 1390861869684379520
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- ISSN
- 21879761
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- OpenAIRE
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- Abstract License Flag
- Disallowed