Multi-Fidelity Simulation of Aircraft Noise Sources and Their Reduction

Dear Colleagues,

The reduction of aircraft noise emissions especially in the environment of highly populated urban areas around airports is an urgent problem that in the foreseeable future will be of even further increasing importance. Novel aircraft concepts will become inevitably necessary to drastically lower the environmental impact of engine emissions. Aerospace engineering could provide drastically new concepts up to zero operational emission and contrail avoiding aircraft design and flight operation that could also be significant as a stimulus for sustainable technical solutions for other transportation sectors.  Future advanced air mobility (AAM) vehicles promise entirely new ways of transportation in the urban environment.

However, the development of novel aircraft and propulsor concepts and their installation effects on noise will require the careful identification of different acoustic sources around future aircraft and other aerial vehicle concepts, a substantial understanding of the underlying noise source mechanism, the deliberate exploitation of design parameters for the minimization of noise emissions, altogether with the application of noise reduction technologies to sustain a continuous future development towards significantly lowered noise emissions.

Numerical simulation methods will play an essential key role in the development of the environmentally friendly low-noise aerial vehicle of the future.

Design-to-noise methods that on the one hand side have a prediction fidelity high enough to cover the main physical principles of the underlying noise generation process but also provide computational turnaround times short enough to be applicable with optimization methods will be crucial to accomplish the targeted noise reduction goals.

Furthermore, the direct derivation of simplified semi-empirical noise prediction from high-fidelity computational aeroacoustics (CAA) simulation will be an essential element that enables the analysis of novel “out-of-the-box” concepts along their take-off and landing flight trajectories. 

This Special Issue entitled “Multi-Fidelity Simulation of Aircraft Noise Sources and Their Reduction” targets research studies that deal with the development and application of new design-to-noise methods in the framework of future aircraft architectures. The range of numerical investigations spans from the prediction of specific broadband and tonal noise sources, such as landing gears, and high-lift noise, the lowering of noise levels relative to datum designs, the numerical evaluation of noise reduction technologies such as porous surface treatments and meta-materials, the rapid and reliable first principle-based prediction of propulsor noise and their installation effects, noise shielding at novel airframe architectures, the development of semi-empirical prediction tools from high-fidelity simulations, as well as high-fidelity methods based aeroacoustics optimization.   

Dr. Roland Ewert
Dr. Lothar Bertsch
Guest Editors

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