Review of the flow-field analysis over cavities

In this paper review of basic oscillation types, their numerical modelling, simulation approaches, and acoustic features of flow over cavities has been provided. Cavities in the supersonic and subsonic flow range have wide utilization but their numerical modelling varies significantly depending on the aerodynamics, structural and fluid dynamics considerations. Comprehensive review of application and advantages of numerical schemes like RANS, LES, DES, DNS model has been provided in the paper. Various cavity types and their characteristic features has also been provided along with their pressure oscillation mechanism and suppression mechanism. Mechanism of Shear layer generation and feed back loop has also been discussed along with cavity noise suppression techniques. Some Active and Passive techniques of noise suppression are also provided in the last section of the paper.