We have studied the transformation process from primary instabilities to secondary instabilities with direct numerical simulations and stability theories (Spatial Biglobal and plane-marching parabolized stability equations) in detail. First Mack mode and second Mack mode are shown to be able to evolve into the sinuous mode and the varicose mode of secondary instability, respectively. Although the characteristics of second Mack mode eventually lose in the downstream due to the synchronization with the continuous spectrum, second Mack mode is found to be able to trigger a sequence of mode resonations which in turn give birth to highly unstable secondary instabilities. In contrast, first Mack mode does not involve in any mode synchronization. Nevertheless, it can still “jump" to a sinuous mode of secondary instability with a much larger growth rate than that of the first Mack mode. Therefore, secondary instabilities of Görtler vortices are highly receptive to the primary instabilities in the upstream, so that one should consider the primary instability in the upstream and the secondary instability in the downstream as a whole in order to get an accurate prediction of the boundary layer transition. Read more.
Featured article: From primary instabilities to secondary instabilities in Görtler vortex flows
Message from the Editors-in-Chief
On behalf of the editorial board, we are honored to announce the launch of a new journal, Advances in Aerodynamics (AIA), and we are very pleased to share with you our vision for the development of this journal. AIA is an international peer-reviewed open access journal which publishes high quality papers with originality, novelty, and significant contributions to the progress in aerodynamics. The journal will provide authors with an open and fair platform to promote their research and identify themselves in the aerodynamics community. Read more.
Aims and scope
Advances in Aerodynamics (AIA) is aimed to report the scientific and technological advances in aerodynamics from the aspects of academic research, industrial development and engineering applications, and to provide a platform for ideas exchange and discussion in this fast-changing field. The journal welcomes reviews and regular papers of novel studies on aerodynamic science and engineering. The topics include but are not limited to:
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▪ Equilibrium and non-equilibrium flow
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- ISSN: 2524-6992 (electronic)