Numerical simulation of steady and unsteady aerodynamics of the WIONA (wing with oscillating nacelle) configuration

This paper presents an overview of numerical simulations of unsteady wing nacelle interference for the generic WIONA configuration, The geometry of the model [4] causes, typical aerodynamic interference effects, including the appearance of a shock in the channel between nacelle, pylon and wing. CFD simulations for the model undergoing forced pitching oscillations show a strong influence of the shocks on unsteady pressure distributions. Three numerical models with varying complexity have been applied, namely unsteady RANS and Euler, both with DLR's TAU code and the unsteady time linearized TDLM code. The fast TDLM code may be applied for attached flow, and results are validated with corresponding ones from the Euler solver. If flow separation occurs, the current RANS simulations are necessary.