Detached-Eddy Simulation (DES) is used to predict the flow over an axlsymmetrlc cavity. The freestream Mach number is 0.4, the length-to-depth ratio of the cavity is equal to five. The main objectives are to characterize the instantaneous and mean properties of the solution, with a focus on the application ofadaptive mesh refinement for improving the efficiency and fidelity of DES predictions. Computations were performed on unstructured meshes with cell shes of 4 × 106 and 5.9 × 106 elements. The finer mesh was adaptively refined Prom the coarser grid such that cell densities were increased by about a factor of three in the cavity. The initially axisymmetric shear layer detaching from the front lip breaks down and the flow develops a range of scales within the cavity, the adaptively refined mesh leading to a deeper range of eddies. Flow visualhations and the mean pressure coefficient along the lower wall indicate that the oscillations in the cavity take place in shear layer mode. DES Predictions of the Strouhal number corresponding to the fundamental and first harmonic are in reasonable agreement with Rosslter's formula.