This paper presents a comparison of linear and nonlinear methods for the analysis of aeroelastic behaviour and .utter boundary prediction. The methods in question include linear NASTRAN and ZAERO, and the non-linear coupled CFD-CSD methods RANSMB and PMB, developed at the Universities of Bristol and Glasgow respectively. The test cases used for the comparison are the MDO and AGARD 445.6 weakened wing. In general, it was found that the nonlinear methods demonstrate excellent agreement with respect to pressure distributions, de.ections, dynamic behaviour, and .utter boundary locations for both cases. This is in contrast to previous studies involving similar methods, where notable di.erences across the MDO span were found, and is taken to imply good performance of the CFD-CSD interpolation schemes employed here. Whilst the linear methods produce similar .utter boundaries to the coupled codes for the aerodynamically simple AGARD 445.6 wing, results for the transonic 'rooftop'?MDO wing design were in less close agreement.
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