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This paper includes computational results and their analyses in case of a 2-dimensional rectangular cavity, assuming laminar flow. A thorough parameter study was made concerning both numerical and physical parameters. As for numerical parameters, the effect of time step, mesh density in various regions, size of the surrounding area, and level of acceptable residuals on the oscillation frequency and amplitude was examined. \nBased on the physical parameter study, quantitative influences of the cavity length, velocity and shear layer momentum thickness on the appearing frequencies was established. The obtained values were compared with Rossiter’s semi-empirical formula, and a good agreement was found for the wave propagation speed and the dominant frequency. Special attention was paid to the low frequency components of the oscillation, found also by Knisely and Rockwell [6] experimentally. In agreement with the above-mentioned paper, the sum of the two low frequencies was equal with the fundamental frequency of shear layer oscillation indicating nonlinear mechanisms. Switching between different modes was also observable. The relationship between the low frequency components and modes were analyzed and the results were compared with the literature. In case of cavity length-depth ratio of 2, two large vortices can be found in the cavity. 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