Study on anisotropic dispersion of particles in turbulence

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K13692
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 19010:Fluid engineering-related
• Research Institution: Central Research Institute of Electric Power Industry
• Principal Investigator: Fukada Toshiaki 一般財団法人電力中央研究所, エネルギー技術研究所, 主任研究員 (30812127)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 粒子拡散 / 乱流 / 固気混相流 / 体積平均

Outline of Final Research Achievements

To clarify the behavior of particle diffusion in turbulent flows, detailed numerical analyses were carried out to evaluate the reproducibility of several diffusion models. Prior to the implementation of the numerical analysis of turbulent flows, an numerical method for reproducing the particle behavior with high accuracy was established and its validity was confirmed. Focusing on the directionality of particle diffusion, the reproducibility of each model was shown to change with particle size. Furthermore, it was clarified that the appropriate particle diffusion model differs between isotropic and anisotropic turbulence.

Free Research Field

流体工学

Academic Significance and Societal Importance of the Research Achievements

本研究の前半で提案した粒子サイズの影響を反映した流体-粒子の相互作用解析手法は、粒子を質点とみなす従来の解析手法よりも現実的であり、大規模かつ高精度な粒子群挙動が再現可能となった。乱流中の粒子拡散挙動に関する結果では、これまで不明であった乱流構造によるモデルの再現性の違いを示した。得られた結果に基づいて条件に応じたモデルの切り替えを提案することで、粒子挙動が重要な工学的応用や自然界の現象に対して高精度な予測を可能にする。