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

[9414088 . Farell]该项目将研究湍流及其尺度对简单建筑模型的流量和压力载荷的影响，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的影响，频谱惯性子范围的波动和尺度畸变将是工作的一部分。在两个隧道测试段中，通过使用不同的涡发生器和所选粗糙度的障壁高度，将产生几个边界层模拟。在保持低频谱能基本不变的情况下，利用尖塔、网格和射流改变小尺度湍流的谱能含量，研究小尺度湍流的影响。该项目的结果将有助于澄清在风洞和全尺寸数据之间的陈述、结果和相关性方面的一些混淆，特别是在大尺度和小尺度波动对钝体波动压力的影响方面，特别是在体表面形成的涡结构下。* * *

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. ***