Computational Analysis of Steady State Aerodynamics of Transonic Truss-Braced Wing Configuration in Deep Stall

This study presents a computational investigation of steady state aerodynamics of the Subsonic Ultra-Green Aircraft Research (SUGAR) Transonic Truss-Braced Wing (TTBW) configuration over a wide range of angles of attack, from pre-stall to post stall, including conditions associated with deep stall. High-fidelity computational fluid dynamics (CFD) simulations are conducted using FUN3D solver to obtain steady-state aerodynamic solutions. The simulations cover an angle of attack range of −10◦ to 60◦ and sideslip angles of 0◦ and 15◦, enabling a comprehensive assessment of pre-stall and post-stall aerodynamic behaviors. Reynolds number effect is investigated through comparative analysis of a 4% scale wind-tunnel model and the full scale configuration. Aerodynamic forces and moments are analyzed to assess the effects of Reynolds number and large wind angles on longitudinal and lateral-directional static stability characteristics. Flow field visualizations are employed to examine the progression of flow separation and its influence on aerodynamic characteristics. This study provides valuable insights into the nonlinear aerodynamic and stability characteristics of the SUGAR TTBW configuration at high angles of attack.