A convected frequency-domain equivalent source approach for aeroacoustic scattering prediction of sources in a moving medium

作者：Siozos Rousoulis Leonidas^*; Amoiridis Orestis; Huang Zhongjie; De Troyer Tim; Kalfas Anestis I; Ghorbaniasl Ghader

来源：Journal of Sound and Vibration, 2018, 431: 88-104.

DOI：10.1016/j.jsv.2018.05.044

• Computational aeroacoustics
• Acoustic scattering
• Moving medium
• Equivalent sources
• Acoustic pressure gradient

In this paper, a convected frequency-domain approach for acoustic scattering prediction is suggested, for sources and scattering surfaces in a uniform constant flow. Frequency-domain moving-medium formulations are used for prediction of the incident acoustic pressure and acoustic pressure gradient. The latter is required for evaluation of the hardwall boundary condition in a moving medium and allows a convected definition of the equivalent sources. The scattering approach is validated by the analytical case of scattering of a pulsating monopole source by a rigid sphere. The applicability of the methodology to moving-medium problems is demonstrated for rotating and pulsating monopole point sources in a uniform flow, located near an infinite flat scattering surface. The suggested approach allows frequency-domain scattering predictions for sources in a uniform constant flow of any subsonic velocity, enabling direct inclusion of convection effects on incident and scattered acoustics. The hardwall boundary condition is thus evaluated directly in a moving medium. The need for a Lorentz transform is obviated, overcoming the complexity it introduces and the limitations it imposes.

• 出版日期2018-9-29