Incompressible turbulent flow over rectangular cavity

Abstract

The pressure distribution on the cavity surface and the velocity of the fully developed turbulent initial free shear layer flow are measured by varying the cavity depth (D=4-8cm) and freestream condition ($Re = 2.3×10^4-5.3 ×10^4$). The continuous behavior of the pressure distribution on the cavity walls is characterized by the lower pressure near the center of walls and bottom and the high pressures at the corner, as well as the highest pressure at the reattachment point similar to those reported elsewhere. However, no downstream separation of the reattachment flow on the bottom for cavity flow of D/W=0.11. Based upon the experimentally measured velocity profile the integral constants of the analytical jet flow are determined, and found that the upstream free shear layer may be assumed as plane jet and its velocity profile can be predicted by mixing length theory. The autospectrum in the newly developed shear layer appears to follow the -5/3 power law not depending upon the cavity depth and freestream velocity.