This paper reports the results of a detailed experimental investigation into the behavior of a turbulent flow in the central plane of a highly-divergent three-dimensional boundary layer, designed to simulate the flow upstream of an isolated building embedded in the atmospheric boundary layer, or a wing-body junction.nThe measurements, which include surface flow visualization, mean velocity profiles, static pressure profiles and flow angles, reveal the presence of a recirculation region which is intolerably sensitive to the presence of pressure probes. Therefore, the results obtained with pressure probes within the flow must be regarded as only semi-quantitative in and near the recirculation region. It follows that laser-doppler or particle-tracing techniques are essential for reliable measurements in this sort of flow.
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