粒子与湍流之间的相对速度

中文摘要 AI 辅助

粒子与周围流体之间的相对速度是决定载粒湍流各种现象（如粒子聚集和粒子引起的湍流调制）的关键量。我们通过扩展Balachandar（2009）的论证，从理论上推导了湍流中载粒粒子相对速度的表达式。该推导为Berk和Coletti（2024）的解析模型提供了一种简化形式，并使潜在的物理假设变得明确。利用周期立方体中的湍流和湍流通道流的直接数值模拟数据，我们验证了所推导表达式的有效性，并表明该表达式也适用于非球形粒子和液滴。

英文摘要

The relative velocity between a particle and the surrounding fluid is a key quantity that determines the various phenomena of particle-laden turbulence, such as particle clustering and turbulence modulation due to particles. We theoretically derive the expression for the relative velocity of a particle laden in turbulence by extending the argument of Balachandar (2009). This derivation provides a simplified form of the analytical model of Berk and Coletti (2024), and it makes the underlying physical assumptions explicit. Using direct numerical simulation data of turbulence in a periodic cube and turbulent channel flow, we demonstrate the validity of the derived expression, and show that it also holds for non-spherical particles and droplets.

发表机构

• Graduate School of Engineering Science, the University of Osaka（大阪大学工学研究科）

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