An Acoustic Intensity-based Method in Aeroacoustics: Theory and Aerospace Applications

Aircraft noise prediction and control is one of the most urgent and challenging tasks worldwide. A hybrid approach is usually considered for predicting the aerodynamic noise. The approach separates the field into aerodynamic source and acoustic propagation regions. Conventional CFD solvers are typically used to evaluate the flow field in the source region. The FW-H equation is used to extend the near-field CFD solution to the far-field acoustic radiation. However the FW-H method requires the data on a "complete control surface", which may be infeasible to accomplish for most practical applications. Motivated by the need for the accurate and efficient far-field prediction techniques, an advanced computational methodology, Acoustic Intensity-Based Method (AIBM), has been developed. This method is computational efficiency and only needs the input data over an "open surface". In general, the AIBM provides an effective alternative for the far-field acoustic prediction of practical aeroacoustic problems.