@ARTICLE{Ma_Ruixian_Hybrid_2019, author={Ma, Ruixian and Liu, Zhansheng and Dooloan, Con J. and Moreau, Danielle J. and Czarnecki, MichaƂ}, volume={vol. 44}, number={No 1}, journal={Archives of Acoustics}, pages={105-116}, howpublished={online}, year={2019}, publisher={Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics}, abstract={A hybrid artificial boundary condition (HABC) that combines the volume-based acoustic damping layer (ADL) and the local face-based characteristic boundary condition (CBC) is presented to enhance the absorption of acoustic waves near the computational boundaries. This method is applied to the prediction of aerodynamic noise from a circular cylinder immersed in uniform compressible viscous flow. Different ADLs are designed to assess their effectiveness whereby the effect of the mesh-stretch direction on wave absorption in the ADL is analysed. Large eddy simulation (LES) and FW-H acoustic analogy method are implemented to predict the far-field noise, and the sensitivities of each approach to the HABC are compared. In the LES computed propagation field of the fluctuation pressure and the frequency-domain results, the spurious reflections at edges are found to be significantly eliminated by the HABC through the effective dissipation of incident waves along the wave-front direction in the ADL. Thereby, the LES results are found to be in a good agreement with the acoustic pressure predicted using FW-H method, which is observed to be just affected slightly by reflected waves.}, type={Article}, title={Hybrid Artificial Boundary Conditions for the Application of Blunt-Body Aerodynamic Noise Prediction}, URL={http://journals.pan.pl/Content/110265/PDF/aoa.2019.126357.pdf}, doi={10.24425/aoa.2019.126357}, keywords={cylinder aerodynamic noise, non-reflecting boundary conditions, large eddy simulation, FW-H acoustic analogy, acoustic damping layer}, }