Numerical analysis on prediction and attenuation of low-speed cavity noise Online publication date: Fri, 01-Mar-2024
by S. Soma Sundaram
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 24, No. 2, 2024
Abstract: Prediction and attenuation of noise generated in the cavity with an overhang has been numerically studied. Simulations are carried out such that two-dimensional, unsteady, turbulent, compressible equations are solved. The geometry considered for the simulations is a deep cavity with an overhang. The dimensions of the cavity and the wind tunnel are obtained from literature. Unsteady pressure data has been collected from the walls of the cavity and discrete Fourier transform (DFT) analyses of these data have been carried out. The predicted frequencies are found to match with the experimentally measured values. Proper orthogonal decomposition (POD) analyses of the data collected indicate the presence of longitudinal duct mode and vortices in the shear layer. The attenuation studies have been carried out by providing a chamfer in the trailing edge. The results indicate the amplitude of the noise has been reduced by five times for a chamfer of 45°.
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