Multibody and Mechatronic Systems Lab - University of Liège, Department of Engineering - Istanbul University

2008-2010

Limit cycle oscillations involving Delta wings are an important area of
research in modern aeroelasticity. Such phenomena can be the result of geometric nonlin-
earity, aerodynamic nonlinearity or under-wing store nonlinearity. A series of investigations of Delta Wing
aeroelasticity by several researchers have demonstrated that low speed LCOs
can be obtained as a result of the interaction of structural geometric nonlinearity with
attached flow aerodynamics.

The purpose of the present research is to determine experimentally to what extent struc-
tural and/or aerodynamic nonlinearities are important in causing Limit Cycle Oscillations
of a Delta wing at different steady angles of attack.

A flexible Delta wing model in the ULg wind tunnel

A demonstration of Delta wing Limit Cycle Oscillations

Exciting a subcritical LCO

References

Subcritical, nontypical and period doubling bifurcations of a Delta Wing in a low speed wind tunnel, B. Korbahti, E. Kagambage, T. Andrianne, N. Abdul Razak and G. Dimitriadis,
Journal of Fluids and Structures, 27(3), 408-426, 2011

Limit Cycle Oscillations of a Delta Wing in a Low Speed Wind Tunnel, B. Korbahti, E. Kagambage, T. Andrianne, D. Watrin and G. Dimitriadis,
International Conference on Noise and Vibration Engineering, ISMA 2010, Leuven, Belgium, September 2010

Analysis of dynamic response of a very flexible Delta wing model in a wind tunnel, M. Barbason, T. Andrianne, D. Hickey and G. Dimitriadis,
International Forum on Aeroelasticity and Structural Dynamics, IFASD 2009, Seattle, Washington, June 2009