Effects of Turbulence and Its Scales on the Flow Around Rectangular Prisms

湍流及其尺度对矩形棱柱绕流的影响

• 批准号: 9414088
• 负责人: Cesar Farell
• 金额: $ 26.08万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-03-01 至 1998-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9414088&HistoricalAwards=false
• 关键词: Effects; Turbulence; Its; Scales; Flow

9414088 Farell The project will study the effects of turbulence and its scales on the flow and the pressure loading on simple building models, in particular, the effect of the length scales of turbulence in relation to the size of the model. The effect of large scale and transverse velocity fluctuations, fluctuations in the inertial subrange of the spectrum and of scales distortions will be part of the work. Several boundary layer simulations will be produced in both tunnel test sections by using different vortex generator and barrier heights for each roughness configuration selected. The effects of small scale turbulence will be studied by using spires, grids and jets to change the small-scale spectral energy content while keeping the low frequency spectral energy essentially unaltered. The results from this project will help clear some of the confusion in statements, results and correlations between wind tunnel and full-scale data especially in regard to the effect of large and small scale fluctuations on the fluctuating pressures on a bluff body, in particular under vortex structures formed off the body surfaces. ***

9414088 FARELL该项目将研究湍流及其对流量的影响以及压力负载对简单建筑模型的影响，尤其是湍流长度尺度相对于模型的尺寸的影响。 大规模和横向速度波动的影响，光谱的惯性子范围和尺度扭曲的惯性次数波动将是工作的一部分。 对于所选的每种粗糙度配置，将在两个隧道测试部分中使用不同的边界层模拟。 小型湍流的影响将通过使用尖峰，网格和喷气式器来改变小规模的光谱能量含量，同时保持低频光谱能量基本上没有改变。 该项目的结果将有助于清除风洞和全尺度数据之间的陈述，结果和相关性中的某些混乱，尤其是关于大小和小规模波动对虚张声势体体波动压力的影响，尤其是在身体表面上形成的涡流结构下。 ***