Final Report: High Speed and Low Speed RANS Results. M-DAW Technical Note, WP2 Task 2.7

Abstract

This report presents RANS CFD solutions obtainend in WP2 Phase II. Results obtained in Phase I are summarized and completed. Solutions were obtained for the N-47 model for high speed and the corresponding XO3d take-off configuration for low speed with three different wing tip devices: Küchemann tip (basic configuration), fence tip and large winglet. Solutions were obtained at various incidences and at constant lift to evaluate performance. Different adpatation mesh refinement procedures were used to improve resolution of flow regions of interest. One and two-equation turbulence models were used. The three wing tip devices were compared by analysing results of pressure distributions, local distributions of force and moment, surface contours and skin friction lines. The RANS results were compared with experimental data obtained in the ETW high speed test and in the DNW-KKK low speed test. In addition in the take-off case the vortex wake was analysed in the nearfield tip region and compared to experimental PIV data obtained in the DNW-KKK test.