An Experimental Study of the Structure and Spreading of Turbulent Spots
Turbulent spots in a free surface water table flow were studied. Flow visualization suggested that the reported differences in shape between the water table and laminar boundary-layer spots may be ascribed to relaminarization of the front part of the former. Linear stability analysis of velocity profiles measured just outside the “wing-tip” of the spot indicated a reduced stability of the flow in this region as compared to the undisturbed laminar flow, which may be seen as a support for a growth-by-destabilization concept. The stability of the flow in this region was also examined in a more direct way by introducing a small secondary disturbance near the wing-tip of the spot.
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