Spatio-temporal scaling law of unsteady turbulence : Rayleigh-Taylor turbulence

非定常湍流的时空标度定律：瑞利-泰勒湍流

• 批准号: 21740290
• 负责人: MATSUMOTO Takeshi
• 金额: $ 1.75万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740290/
• 关键词: 流体物理; 乱流の統計理論; レイリー・テイラー不安定性; 密度変動乱流; 乱流の統計理

Under the influence of the gravity, when a heavy fluid is placed on top of a light fluid, the two fluids soon become turbulent and mix each other. This turbulent flow is known as Rayleigh-Taylor turbulence. Since it is one of the most frequently seen turbulent flows in our everyday life, understanding the nature of the turbulent fluctuation and its mixing properties has a significant value. In the present study, we measure functional dependence (so-called scaling law) of the turbulent velocity and density fluctuations on the time and spatial scales by using numerical experiments.

在重力的影响下，当一种重的流体被放在一种轻的流体上时，这两种流体很快就会变得湍急并相互混合。这种湍流称为瑞利-泰勒湍流。由于它是我们日常生活中最常见的湍流之一，了解湍流脉动的性质及其混合特性具有重要的意义。在本研究中，我们通过数值实验测量了湍流速度和密度涨落在时间和空间尺度上的函数相关性(即所谓的标度律)。