U.S.-France Cooperative Research: Concentration Flux Measurements and Modeling of Scalar Transport in Bounded Turbulent Shear Flows

这项为期三年的奖项为美法合作研究提供支持， 被动标量污染物从线源和点源在壁面的扩散 紊流边界层 研究人员将进行理论和实验 研究标量场的行为和预测，因为它与城市空气质量有关。 这项合作涉及由詹姆斯M。华莱士大学 马里兰州和Michel Ayrault的流体力学和声学实验室， 法国里昂的中央学校。 实验将结合联合收割机光学测量 方法：粒子图像测速法和米氏散射浓度测量， 以获得流中的标量通量。 此外，调查人员将检查 一种新的非局部标量通量模型对相同流动条件的预报能力 在实验工作中考虑。 结合理论建模和 实验将促进对标量场的行为和预测的理解， 从而减少了城市空气质量模型中不确定性的主要来源。 美国研究人员为这次合作带来了湍流边界研究方面的专业知识 层和标量色散。 法国在PIV/Mie方面的专业知识对此进行了补充 散射技术和一个特殊的风洞，以适应要求 PIV/Mie散射测量技术。

This three-year award provides support for US-France cooperative research on studies of the dispersion of passive scalar contaminants from line and point sources at the wall of turbulent boundary layers. The investigators will conduct theoretical and experimental studies into the behavior and prediction of scalar fields as it relates to urban air quality. The collaboration involves research groups led by James M. Wallace of the University of Maryland and Michel Ayrault of the Fluid Mechanics and Acoustics Laboratory of the Ecole Centrale in Lyon, France. The experiments will combine optical measurement methods: Particle Image Velocimetry and Mie scattering concentration measurements in order to obtain scalar fluxes in the flows. In addition, the investigators will examine the predictive capabilities of a new non-local scalar flux model for the same flow conditions considered in the experimental work. The combined theoretical modeling and experiments will advance understanding of the behavior and prediction of scalar fields, thus reducing a principal source of uncertainty in urban air quality modeling. The US investigators bring to this collaboration expertise in studies of turbulent boundary layers and scalar dispersion. This is complemented by French expertise in PIV/Mie scattering techniques and a special windtunnel adapted to accommodate the requirements of the PIV/Mie scattering measurement techniques.