Wall heating effects on aeroacoustic fields radiated by rigid bodies at different flow regimes

This study presents several direct numerical computations concerning wall heating effects on aeroacoustic fields derived from flow-rigid body interaction. Both laminar and turbulent flow configurations involving isolated and multibody arrangements have been addressed. Some insights into the physical mechanisms concerning these problems are addressed and discussed. In particular, we observed that the aeroacoustic fields produced by laminar flows can be more easily controlled and practically suppressed in terms of acoustic emission by wall heating. By contrast, in turbulent flows, the effectiveness of the analysed technique is more limited. Indeed, wall heating produces a slight increase in overall emissions. However, at the tonal peak frequency derived from adiabatic configuration, the acoustic contribution is considerably reduced