Fluid-Structure Interaction; Stiffness Effects on Airfoil Flutter: A numerical study of airfoil flutter in STAR-CCM+
Typ
Projektarbete, avancerad nivå
Program
Publicerad
2022
Författare
Tylén, Oskar
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
This report looks in to the phenomenon called flutter, a type of flow induced vibration
in structures occurring at specific flow conditions. Specifically, the project looks at how
flutter affects airfoils, and how the structural stiffness of the airfoil impacts the flutter
effects at a certain set of conditions.
The analysis was carried out using commercial CFD solver STAR-CCM+. Within this
software, the structural dynamics of a symmetric NACA0012 airfoil were modeled as
a two-degree-of-freedom system with one bending mode and one torsional mode. Due
to constraints on computational power and time, the mesh generation was adjusted to
reduce computational time as much as possible without it effecting the behaviour of
certain parameters, particularly the aerodynamic lift coefficient which was considered an
important performance measure for the airfoil.
The results indicate that with a given set of operating conditions, adjusting the structural
stiffness can be used as an effective countermeasure against flutter. However due to the
mesh limitations mentioned above, the quality of the results can be questioned when
looking closer at the flow field and numerical instabilities effecting some parameters.
Beskrivning
Ämne/nyckelord
Fluid Structure Interaction , FSI , Flow Induced Vibrations , Airfoil Flutter , STAR-CCM+ , Structural Dynamics