One of the crucial elements that have led to the golden age of aeroacoustics is a stupendous demand for vertical flight. The widespread use of drones for future delivery of packages and transportation is inevitable, as a recent Morgan Stanley market research update suggests it could be a 9 trillion dollar industry by 2050. One of the main issues will be the noise produced by eVTOL and drones because of their low-altitude flight envelope. 

The department of defence has iniated the Replicator program, which is set to to field several attritable and autonomus systems (several thousands) in the next 18-24 months  Read more . A reduced noise signature will make them furtive and difficult to detect.

 The Lattice Boltzmann Method (LBM) and Particle Image Velocimetry (PIV) will play a key role in high fidelity aeroacoustic optimization. These methods allow for direct estimation of flow induced sound sources, while former also provides a far-field propagation of acoustic noise. These advances will lead to the design of next generation quieter aircraft, drones, and eVTOL.