Abstract
Global linear stability analysis is performed for a coupled fluid–structure-interaction problem of a NACA0012 airfoil at transitional Reynolds numbers to investigate the phenomenon of spontaneous pitch-oscillations. It is shown that the spontaneous onset of aeroelastic instability is due to a linearly unstable mode of the coupled fluid–structure-interaction problem. The parameter range of instability predicted by the global stability analysis is consistent with the observations of previous experimental and numerical investigations. However, the results show that the onset of instability and the frequency selection mechanisms are decoupled. The onset of pitch-oscillations is caused due to a zero frequency divergence instability while the frequency selection is likely due to a sub-critical mode which is non-linearly excited. In addition the stability results provide an explanation for the absence of the von-Kármán modes’ frequencies in the pitch response, based on the shape of the eigenvectors of the system.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.