Abstract: In this paper a time-domain aeroelastic analysis code is described for single airfoils and two-foil systems in incompressible, inviscid flow. Flow solutions are obtained using a time-stepping panel code, and airfoil motions are computed using a two-degree-of-freedom (TDOF) spring/mass model. The time-stepping aeroelastic code is evaluated through comparisons with several classical frequency-domain studies for both single-degree-of-freedom (SDOF) and TDOF motions. SDOF results show excellent agreement with past studies and, furthermore, provide a look into the evolution of the motion in time. Additionally, using a two-foil system, it is shown that flutter of a trailing airfoil can be controlled by proper oscillation and phasing of a leading airfoil. TDOF results highlight a step-size dependence of the panel code, but again demonstrate the active flutter control by means of an oscillating leading airfoil. A method for simulating unsteady rotary wing flowfields with the two-foil aeroelastic code is described, and comparisons with past frequency-domain studies show good agreement.

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