Abstract
I am pleased to introduce the special issue of International Journal of Aeroacoustics (IJA) composed of papers united by the common topic “Computational Experiment in Aeroacoustics and associated Aerodynamics” (CEAA).
With the continuous support of the journal, special CEAA issues have become a good tradition. Normally, they include selected papers presented at the International Workshops “Computational Experiment in Aeroacoustics” and “Computational Experiment in Aeroacoustics and associated Aerodynamics” which regularly take place in Svetlogorsk, Russia, from 2008 onwards. The goal of these bi-annual Workshops is to discuss the state-of-the-art of computational aeroacoustics and its challenges from the viewpoint of aerospace and other industries dealing with unsteady high-speed flows and needing to reduce the associated undesirable sound. The Workshops offer an opportunity for fruitful inter-branch discussions among researchers, engineers, software developers and representative of the industry, in order to develop and promote computational experiment in aeroacoustics and unsteady aerodynamics as an efficient tool for applied research and design. In 2020 and 2022, the CEAA Workshops were cancelled due to the COVID-19 pandemic as face-to-face scientific discussions, so crucial for CEAA meetings, could not be held.
The current issue consists of five papers submitted by the authors from China, Germany, Italy and Russia. Four contributions focus on simulation and optimization problems targeted at aviation-industry applications. The papers of Prof Xin Zhang and his colleagues from Hong Kong University of Science and Technology and College of Engineering of Peking University consider different simulation approaches, namely, boundary element method and immersed boundary technique, to study such aeroacoustics phenomena as fuselage scattering of drone noise and aerofoil leading edge noise. The authors from DLR Michael Moessner, Jan Delfs and Michael Pott-Polenske present an interesting work concerning the investigation of noise shielding of a deflected flap. They propose an original approach to provide a reasonable agreement between the numerical data obtained using the boundary element method and the results of flyover measurements with a lack of input data. The most innovative computational techniques in my opinion are presented in the paper of the researchers from Roma Tre University with Lorenzo Burghignoli as a corresponding author. They develop adaptive metamodels based on radial basis functions to be used in the design optimization process for unconventional aircraft layouts. The fifth paper prepared by Ekaterina Guseva from St-Petersburg Polytechnical University and Yuri Egorov from ANSYS Germany study the noise induced by a flow past a car side mirror. For this purpose, they developed a hybrid method for simulating aeroacoustics of turbulent flows at low Mach numbers and implemented it in the Ansys Fluent CFD package. I hope you will enjoy reading all presented papers in detail.
I would like to thank the IJA editor and the reviewers for this special issue. Because of their kind assistance and earnest efforts, the CEAA special issues continue despite the pandemic. The next CEAA Workshop in Svetlogorsk is scheduled for September 2024.