Abstract
This paper presents a number of wind tunnel measurements of building induced downwash effects on the plume in a neutrally stable boundary layer. Vertical and horizontal profiles of mass concentrations of the exhausts from stacks on a rectangular model building were measured downwind of the buoyant source in the near wake. These experiments were conducted in a simulated natural wind over open country terrain for various freestream wind speeds with different stack and building configurations. Significant downwash effects from the building below the stack were observed in all tested configurations. In this preliminary study, only mean concentrations were evaluated and are presented in non-dimensional form.
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