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尺度对简单建筑模型的流动和压力载荷的影响，特别是湍流长度尺度对模型尺寸的影响。 大尺度和横向速度波动、频谱惯性子范围的波动以及尺度扭曲的影响将是工作的一部分。 通过针对所选的每个粗糙度配置使用不同的涡流发生器和势垒高度，将在两个隧道测试部分中产生多个边界层模拟。 将通过使用尖顶、网格和射流来改变小尺度光谱能量含量，同时保持低频光谱能量基本不变，来研究小尺度湍流的影响。 该项目的结果将有助于消除风洞和全尺寸数据之间的陈述、结果和相关性中的一些混乱，特别是在大尺度和小尺度波动对钝体脉动压力的影响方面，特别是在身体表面形成涡流结构。 ***