Numerical investigation of near-wall transport and structure formation processes in turbulent Rayleigh-Bénard convection

湍流瑞利-贝纳德对流中近壁输运和结构形成过程的数值研究

• 批准号: 153847721
• 负责人: Professor Dr. Jörg Schumacher
• 金额: --
• 依托单位: Fachgebiet Strömungsmechanik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/153847721?language=en
• 关键词: Numerical; investigation; near; wall; transport

The dynamical processes in the temperature and velocity boundary layers of a turbulent convection flow are of fundamental interest for a more detailed determination of the global heat transport. In the present project, we want to study the dynamics and structure formation in the boundary layers of turbulent Rayleigh-Bénard convection by means of direct numerical simulations. We want to vary therefore the Rayleigh and Prandtl numbers as well as the aspect ratio of the cylindrical convection cell and study the dependence of the global transport laws on these parameters. In parallel we want to investigate the near-wall coherent structures, their dynamics in the boundary layers and their statistical impact on the global transport properties. Our simulations will unravel the differences of the convection boundary layers to the classical boundary layers and resolve the beginning of the transition to turbulence at high Rayleigh numbers.

湍流对流的温度和速度边界层中的动力学过程对于更详细地确定全球热传输是非常重要的。在本项目中，我们希望通过直接数值模拟的方法来研究湍流Rayleigh-Bénard对流边界层中的动力学和结构形成。因此，我们希望改变柱面对流单体的瑞利数、普朗特数和纵横比，并研究全球输运规律对这些参数的依赖关系。同时，我们想要研究近壁相干结构，它们在边界层中的动力学以及它们对全球输运性质的统计影响。我们的模拟将揭示对流边界层与经典边界层的不同之处，并解决在高瑞利数下向湍流转变的开始。