Further Comparisons of Predicted and Measured Aerodynamic Characteristics of the DLR LK6E2 Missile Airframe(Scale Resolving)

Abstract

Scale-resolving simulations (SRS) using the Hybrid Reynolds-Averaged Navier-Stokes(RANS) - Large Eddy Simulations (LES) method have been conducted in order to predict therolling moment coefficient of a generic missile at high angles of incidence and high subsonicspeed. The missile airframe was rolled at 45 degrees, generating asymmetrical flow and abreak in the rolling moment versus incidence angle curve in the wind tunnel, which has provendifficult to capture. Previous investigations indicated improved numerical predictions withSRS compared to traditional RANS, with a few exceptions. Following the earlier study, furtherangles of incidence have been computed using SRS and compared to new wind tunnelmeasurements. Additionally, a time step investigation revealed its influence on the rollingmoment predictions. The flow topology is more consistently captured by SRS compared toRANS simulations. This work has been conducted within the NATO Science and TechnologyOrganization (STO), Applied Vehicle Technology (AVT) panel under Task Group AVT-390,"Vortex Flow Predictions for Stability and Control of Missile Airframes.