American Institute of Aeronautics and Astronautics
Proceedings of the 20th AIAA/CEAS Aeroacoustics Conference
AVIATION 2014 location:Atlanta (GA), USA date:16-20 June 2014 AIAA/CEAS Aeroacoustics Conference edition:20 location:Atlanta (GA), USA date:16-20 June 2014
This study compares two numerical methods based on the Linearized Navier-Stokes equations (LNSE) for the simulation of a resonator in presence of a cold mean flow: a time domain Runge-Kutta Discontinuous Galerkin (RKDG) code and a frequency-domain high-order continuous Finite Element Method (pFEM). The results are compared to experimental data from a dedicated experimental campaign on a slit resonator. It was shown that the simulations predict the correct trends, but some discrepancies have been observed. The origin of these differences has to be investigated further. Different impedance measurement techniques are applied to the numerical and experimental data to obtain the acoustic impedance of the slit resonator. Within their respective range of validity, reasonable agreement is found between the different techniques.