Experiments have been performed to measure the velocity field and surface pressure synchronously for flow over an open cavity. Specifically, an l/d = 6 full span cavity with a Mach 0.6 free stream flow and a turbulent boundary layer at the cavities leading edge was studied. The study focuses on using these measurements in a mean-square estimation technique to study the time dependence of a low-dimensional formulation of the velocity field. Utilizing select modes from the Proper Orthogonal Decomposition in the estimation technique, flow features associated with select Rossiter modes were reconstructed. The time dependent estimated flow field demonstrates how the shear layer structures and free stream velocity interact with the aft wall of the cavity to form the source of the intense areoacoustic environment known to exist in cavity flows.

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