DLR Results for the 1.5 AIAA Stability and Control Prediction Workshop Investigating a Wing and Wing-Tail Section of the Common Research Model

Abstract

A summary about the DLR results for the Special Session of the AIAA Stability and Control Prediction Workshop regarding the wing section only and wing/tail section of the Common Research model (CRM) is presented. The first prediction workshop revealed a deficit in the accurate determination of the pitching moment coefficient of the Common Research wind tunnel model. Thus, the idea is to perform investigations on a wing only and wing/tail section to improve the prediction accuracy for the pitching moment, and in consequence pitching moment derivatives, to increase the prediction reliability for future workshops. The two-dimensional sections of the CRM wind tunnel model are used to calculate a transonic Mach number sweep for a given lift coefficient to explore mesh-independent solutions. Using aerodynamic coefficients and their partial and total derivatives, and determining the velocity vectors at a defined location provides insight into the different meshing strategies for both airfoils and the wing wake. In addition, DLR also computed the optional test cases by evaluating the lift coefficient range from zero to the maximum for the wing only and the wing/tail case, and evaluating the derivative of the pitching moment coefficient with respect to angle of attack and tail incidence angle for the wing/tail case. The analysis shows that the derivative prediction on the two-dimensional CRM case proves to be very sensitive regarding the grid quality, wing and tail incidence angle as well as the shape of the tail geometry.