Numerical simulations are performed to study the large amplitude oscillations of a flexible surface in the divergence range of flow speeds for a potential flow. A finite-difference method for the structural mechanics is coupled with a boundary-element method for the fluid mechanics. For the open flow, a theoretical equation is derived which accurately predicts the amplitude of the plate's mean state about which limit-cycle flutter-type behaviour occurs. For channel flow it is found that reducing the channel height effects an increase in the amplitude of the oscillations. The relationship between the amplitude of the mean state and maximum deflection of oscillations is characterised and found not to depend upon the channel height.
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