Prediction of broadband trailing edge noise from a NACA0012 airfoil using DNS and WMLES*

Motivated by the need to predict the broadband noise generated by the main propulsive fan of modern gas turbine engines, we study the broadband noise due to the turbulent flow on a NACA0012 airfoil at zero degree angle-of-attack, a chord-based Reynolds number of 408,000 and a Mach number of 0.1 using direct numerical simulation (DNS) and wall-modeled large-eddy simulation (WMLES).  We investigate the flow hydrodynamics and sound generation from the WMLES and examine its predictability compared with our DNS results, as well as available datasets for the same flow conditions. Verification of WMLES for such a canonical problem is crucial since it provides useful insight about the WMLES approach before using it for broadband fan noise prediction.  We discuss the resolution requirements necessary for the accurate prediction of wall surface pressures using WMLES.