On the Vortex Dynamic of Shear-Driven Deep Cavity Flows with Asymmetrical Walls

The influence of the wall asymmetry on the flow dynamics, in two-dimensional rectangular deep cavities, is studied experimentally by combining wall-pressure and Piv measurements. Main cavity flow statistics [2] have been analyzed and they have shown that the flow features are strongly affected by the asymmetry. An emphasis is given concerning the behavior of the shear-layer oscillations that are compared to the analytical deep-cavity model prediction proposed by Block (Noise response of cavities of varying dimensions at subsonic speeds. Technical Report D-8351. NASA Technical Note, 1976 [4]). The results show that, by adjusting the convection velocity, the model seems to be still able to predict the cavity self-sustained oscillations in the case of the asymmetric cavities. Stochastic estimation of the cavity flows demonstrates that convective structures are involved downstream of the cavity along the wall and highlights the physical nature of the pressure-producing flow structures.