Study of time-marching method for fluid/structure coupling solution based on CFD technique

A hybrid linear multi-step scheme (HLMS) based on the Adams implicit method is developed for the aeroelastic governing equation. The structural part is solved implicitly while the general aerodynamic part is solved explicitly, instead of calling the solvers of flow field. A predictor-corrector approach for aeroelastic time-marching is formed, in which the Adams explicit method is used for the predictor step. The calculation of the flow field is only performed in the predictor step during the whole iterative procedure. The accuracy and stability of the present method are almost the same as the Adams predictor-corrector procedure while keeping the characteristics of Adams explicit method for the high efficiency and convenience. Thus the existent solvers of flow field and structure can be modularized and employed to solve the aeroelastic problems directly. The transonic response of an aeroelastic model (Isogai wing) is calculated, in which the unsteady loads are computed by Euler codes. The present method is compared with several classic time-domain simulation methods. The results clearly validate its precision, stability and efficiency.