Nonlinear panel flutter computation with subcycling and predict-correct scheme

Weak coupling scheme in fluid-structure interaction introduces lag error which results in divergence of computation. To eliminate the error and enhance computing efficiency, subcycling and predict-correct scheme were combined and applied to the supersonic nonlinear panel flutter problem. Dynamic response of the panel was simulated with finite element method, while the geometric nonlinear effect caused by large deflection of the panel was considered. The fluid flow disturbed by panel vibration was computed with Fluent, which has the ability to calculate the governing equations with geometry conservation law. It is demonstrated that the subcycling predict-correct scheme is able to eliminate the lag error of weak coupling and keep the long running time of computation stable.