This work is based on the article of Bence Farkas and György Paal , which numerically studied a generic cavity model that mimics a gap in a vehicle (e.g. door gap) within comressible and incompressible flow fields. The computational domain was based on a benchmark (category 6) published by NASA , which was adjusted to the needs of their study. Throughout the simulations various turbulence models, flow velocities and boundary conditions have been applied and compared. The authors concluded that in case of incompressible flows the assessed results were lacking on accuracy, which is why this thesis concentrates exclusively on compressible flow fields and aims to achieve a deeper view and better understanding of their nature. Within this thesis, various 3D-mesh generation strategies were investigated and compared using numerical flow simulations (Computational Fluid Dynamics CFD) in ANSYS Fluent 18.0 applied for the case of compressible fluids. Furthermore, the mesh convergence as well as the functionality of various latest hybrid turbulence models (e.g. SBES ) were examined. Thereafter the ssessed flow fields are then used for the calculation of acoustic source terms and acoustic fields within the in-house simulation software Coupled Field Simulation CFS++. At the end the influence of the flow velocity, the boundary layer thickness, the time step size as well as the used turbulence models and the source term calculation strategies on the acoustic radiation characteristics of the deep cavity were evaluated. Within the scope of the CFD study, the origin of some previously unknown modes in the pressure spectrum of the present cavity problem could be defined. Furthermore, the role of the three-dimensional Taylor-Görtler vortices from the recirculation for the vortex formation, as well as for the vortex-edge interaction and the associated sound radiation was also evaluated.