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Nonlinear inviscid aerodynamic effects on transonic divergence, flutter and limit cycle oscillations

Publication ,  Conference
Thomas, JP; Dowell, EH; Hall, KC
Published in: 19th AIAA Applied Aerodynamics Conference
December 1, 2001

Using a state of the art computational fluid dynamic (CFD) method to model nonlinear steady and unsteady transonic flows in conjunction with a linear structural model, an investigation is made into how nonlinear aerodynamics can effect the divergence, flutter, and limit cycle oscillation (LCO) characteristics of a transonic airfoil configuration. A single degree of freedom (DOF) model is studied for divergence, and one and two DOF models are studied for flutter and LCO. A harmonic balance method in conjunction with the CFD solver is used to determine the aerodynamics for finite amplitude unsteady excitations of a prescribed frequency. A procedure for determining the LCO solution is also presented. For the configuration investigated, nonlinear aerodynamic effects are found to produce a favorable transonic divergence trend, and unstable and stable LCO solutions respectively for the one and two DOF flutter models. © 2001 by Jeffrey.

Duke Scholars

Published In

19th AIAA Applied Aerodynamics Conference

Publication Date

December 1, 2001
 

Citation

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Thomas, J. P., Dowell, E. H., & Hall, K. C. (2001). Nonlinear inviscid aerodynamic effects on transonic divergence, flutter and limit cycle oscillations. In 19th AIAA Applied Aerodynamics Conference.
Thomas, J. P., E. H. Dowell, and K. C. Hall. “Nonlinear inviscid aerodynamic effects on transonic divergence, flutter and limit cycle oscillations.” In 19th AIAA Applied Aerodynamics Conference, 2001.
Thomas JP, Dowell EH, Hall KC. Nonlinear inviscid aerodynamic effects on transonic divergence, flutter and limit cycle oscillations. In: 19th AIAA Applied Aerodynamics Conference. 2001.
Thomas, J. P., et al. “Nonlinear inviscid aerodynamic effects on transonic divergence, flutter and limit cycle oscillations.” 19th AIAA Applied Aerodynamics Conference, 2001.
Thomas JP, Dowell EH, Hall KC. Nonlinear inviscid aerodynamic effects on transonic divergence, flutter and limit cycle oscillations. 19th AIAA Applied Aerodynamics Conference. 2001.

Published In

19th AIAA Applied Aerodynamics Conference

Publication Date

December 1, 2001