Dr. Emre Özkaya, SciComp

Title:
A Discrete Adjoint Approach for Extended Helmholtz Resonator Model in Aeroacoustic Design Optimization

Abstract:

In this talk, we present a novel discrete adjoint approach for aeroacoustic design optimization. The main motivation behind the work is the noise minimization of turbofan engines using Extended Helmoltz type of acoustic liners. This type of optimization problems is characterized by a large number of design parameters and high computational cost caused by the unsteadiness of the physical phenomena and numerical methods that use forcibly higher order schemes in space and time to resolve the aeroacoustic sound propagation. In the first part of the talk, a brief review on the numerical methods used in Computational Aeroacoustics (CAA) will be given. Then, we focus on the Linearized Euler Equations (LEE) and liner impedance modelling using extended Helmholtz resonators. Finally, a discrete adjoint method that is used to compute the sensitivities of sound level with respect to liner parameters will be presented.