Abstract
The influence of an emerging obstacle on a constant sidewall injection flow is investigated. The confined chamber where the flow develops acts as a resonator; a nozzle placed in the flow exit represents an impingement area for vortices to favor the occurrence of a feedback phenomenon. When the obstacle height is one-quarter of the channel height, the shear layer generated in its wake reattaches some distance downstream, and relatively intense vorticity is generated at the sidewall. The resulting structures have the characteristics of wall vortices, and the flowfield behaves like a well-known injecting flow without obstacle
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