Abstract
This paper considers in detail particular flows of the kind which give rise to single-sided ventilation. It presents an experimental study of turbulent flow in a square cavity, with particular reference to the shear layer between cavity and external flows. Hot-wire measurements were carried out in a cubical cavity placed beneath the floor of the test section of the boundary-layer tunnel. Results are presented for zero, positive and negative external pressure gradients, and include time-mean velocity, as well as turbulence intensities, kinetic energy, and shear stress. Flow visualization conducted in a smoke tunnel reveals the behaviour in the shear layer and within the cavity. Predictions of two-dimensional flow fields have been undertaken using a finite-difference scheme and a two-equation model of turbulence. Comparisons with measurements show good agreement in regions where the comparison is valid, and reference to the flow-visualization studies reveals that the essential features of the entire flow field are reproduced by the analytical model.
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