Cavity acoustics analysis — An extensive comparison of turbulence model coefficients

An extensive research has been conducted to determine the effect of changing turbulence model coefficients in order to effectively predict the acoustic signature of a cavity subjected to flow field. The turbulence coefficients of a variety of turbulence models like: k-ε, k-ω, Reynolds Stress, Shear Stress Transport (SST) and Large Eddy Simulations (LES); were analyzed and compared in terms of accuracy, time consumption and resources. The methodological analyses of calculated results are verified with known different kinds of cavities configurations; thereafter present research focuses on acoustic results variation once SST turbulence model coefficients are changed. It is pertinent to mention that once turbulence model coefficients are changed, the results deviate; therefore it is critical to analyze the effect of change in the value of these coefficients on acoustic results for a database of results. It was revealed that while changing the coefficients the results do not significantly give accurate predictions except for a change in a critical type of coefficient. Numerical experimentation and extensive regression analysis lead us to develop a turbulence model coefficient strategy with acceptable engineering limits. This numerical methodological procedure is enhanced by regression analysis on known configurations and a comparative study between Large Eddy Simulations (LES); and SST turbulence model with their respective different coefficients was concluded to find the location of relative strengths of the noise sources with more accuracy and quite remarkable reduction in time consumption as compared to traditionally used DES and LES turbulence models. We believe that this study has a permanent place in the engineering literature.