Progress in Steady/Unsteady Fluid-Structure Coupling with Navier-Stokes Equations

This paper presents some recent work achieved at ONERA, concerning the development and validation of an aeroelastic module which has been implemented on the aerodynamic Euler/Navier-Stokes elsA platform. Both elsA and the aeroelastic module make use of an object-oriented design and implementation. The goal is to provide a general and extendable environment allowing to perform various types of aeroelastic simulations in timedomain, such as harmonic forced motion computations, and also static coupling and dynamic coupling with different structural approaches. The capability to predict static aeroelastic phenomena at transonic conditions is demonstrated in the case of an industrial wing/body/pylons/nacelles configuration, studied in the AWIATOR European project. Dynamic fluid-structure coupling simulations have also been achieved in the case of the twodimensional NLR7301 supercritical airfoil with a two-degree of freedom structural model, experimentally studied at DLR. Dynamic response simulations, exhibiting limit cycle oscillations induced by flow non-linearities, have been worked out for flow conditions corresponding to data point MP77, and the characteristics of the LCO phenomenon are compared with DLR experiments.