A set of three panels depicting both the scalar and flow fields.Data are obtained from performing a direct numerical simulation (DNS) of a fully-developed turbulent channel flow with the wall-source dispersion at the bottom wall. The upper panel illustrates the animation related to the instantaneous concentration field with a strong source strength. The central panel illustrates the instantaneous concentrations emanating from the lower wall-source with a weak source. The lower section showcases the instantaneous streamwise velocity field. All animations are aligned with the identical simulation time.In the upper and middle panels, the spatial zones indicated by the green contour level reflect regions where the concentration is not influenced by the bottom wall-source and is equal to the incoming background scalar field.
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