The influence of particles on turbulence intensity in a high Reynolds number ABL flow

Abstract eng:
A dust storm is a particle-laden two-phase flow with a Reynolds number of up to ReIJ(106). The effect of particles on wind flow has gotten more and more attention; meanwhile it is important to understand the turbulence statistics in boundary-layer flow with particles. Therefore, field observations were conducted in the Desert of Qingtu Lake in western China, Results from these data revealed that a) the presence of sand particles appears to enhance both the streamwise and vertical turbulence intensities, with increases up to 20%; b) vertical turbulence intensity is likely to be more affected by particle than streamwise intensity; and c) with an increase in Reynolds number, the increases of streamwise and vertical intensities caused by particles are likely to be more significant. We also provide a physical interpretation of these phenomena. These results contribute to understanding the turbulence characteristics of a high Reynolds number ABL flow with particles.

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