Symmetric formulations combined with component mode synthesis for analyzing coupled fluid-structure problems. Reviews and extensions

This paper presents a symmetric formulation combined with component mode synthesis to analyze coupled fluid-structure problems. First, the symmetric formulations for coupled fluid-structure problems are revised. Then, based on these reviews, a symmetrization method based on fixed interface transformation and substructuring method is proposed. Afterwards, one of Felippa's formulations has been subsequently re-established by applying the proposed transformation matrix. In addition, the modal amplitude of branch modes has been proposed as a mode truncation criterion with regard to the forced response calculation of reduced models. Finally, the proposed symmetric formulation combined with component mode synthesis has been applied to a coupled fluid-structure problem to analyze the coupled vibration characteristics, the simulation results of which have shown the efficiency of the proposed strategy.