Structure of Turbulent Motion in Thermal Convection

热对流中湍流运动的结构

• 批准号: 8920605
• 负责人: Ronald Adrian
• 金额: $ 55.47万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-02-15 至 1995-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8920605&HistoricalAwards=false
• 关键词: Structure; Turbulent; Motion; Thermal; Convection

The objective of this research is the continued development and use of a high resolution particle image velocimeter to measure instantaneous velocity fields in water when the latter is heated from below. In addition, temperature will be measured and combined with momentum to investigate selected large-scale structures as a function of the Rayleigh number. These results, together with a suitable sequence of photographs depicting the evolution of the velocity field, will be used to investigate the relationship between large and small scales of motion, especially with respect to formulating improved relationships for sub-grid scale stresses in (large eddy) numerical simulations of turbulence.//

这项研究的目的是继续发展 以及使用高分辨率粒子图像速度计， 测量瞬时速度场在水中时，后者是 从下面加热。 此外，还将测量温度， 与动量相结合，研究选定的大规模 结构作为瑞利数的函数。 这些结果， 连同一系列适当的照片， 速度场的演变，将被用来调查 大尺度和小尺度运动之间的关系，特别是 关于为子网格制定改进的关系 大涡数值模拟中的尺度应力 turbulence.