The generation of broadband noise in turbomachinery is influenced by the effects of unsteady loading. This paper aims at predicting that noise by numerically simulating the classical case of an airfoil embedded in the wake of a circular cylinder using the Detached-Eddy Simulation (DES) suite of the SU2 solver coupled with the Ffowcs-Williams and Hawkings (FW-H) technique. The rod-airfoil configuration is numerically simulated to study the noise generation dependency on cylinder size (diameter) and the gap between the cylinder and the leading edge of the airfoil. A detailed experimental study and numerical simulations available enable the validation of the approach. The main aim of the study is to investigate (ⅰ) the impact of geometric effects (cylinder diameter and the gap between the cylinder and airfoil) on the noise generation, and (ⅱ) the applicability of the SU2 solver in aeroacoustics. Even for 2D simulations, it was found that the parameters of the turbulent wake of the cylinder were reproduced sufficiently well. Regarding the generated noise, however, the current study shows that a 2D simulation only enables the prediction of very basic trends. A better prediction of the impact of the geometric effects on the noise generation, as observed in accompanying wind tunnel experiments, possibly require a 3D simulation and hence a notably increased computational effort.
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