The present study was performed to determine how significant the interference effects of the wind-tunnel model support system and tunnel walls can be for a high-speed configuration during takeoff and landing conditions. A 5-percent scale model of the Technology Concept Airplane was recently tested in the Langley 14- by 22-Foot Sub-sonic Tunnel. The model was numerically modeled with and without the support and tunnel walls and compared with experimental data. Detailed analysis of the flow provided additional insight concerning what effects the post support and tunnel walls had on the flow field. This study revealed that although the overall forces and moments could be experimentally accounted for, the detailed flow features, such as the surface pressure distributions, could not be accurately simulated without including the post support in the computations.Lessard, Wendy B.Langley Research CenterCOMPUTATIONAL FLUID DYNAMICS; SCALE MODELS; SUPPORT SYSTEMS; WIND TUNNEL MODELS; WIND TUNNEL WALLS; COMPUTATIONAL GRIDS; AERODYNAMIC INTERFERENCE; SUBSONIC FLOW; LIFT; FLOW DISTRIBUTION; PRESSURE DISTRIBUTION; AERODYNAMIC CONFIGURATIONS...