Shock-Aware Constrained Optimization of the RAE2822 Transonic Airfoil via a Two-Channel vSDF Surrogate with Closed-Loop CFD Verification

This study examines the shock-aware aerodynamic shape optimization of transonic airfoils, particularly focusing on the RAE2822 profile. The goal aims drag reduction for the specified lift-targeted condition, keeping the relative thickness baseline. The approach uses a 16-dimensional CST vector for the parameterization of the airfoil, which is then translated into a two-channel vertical signed distance field (vSDF) representation. In this vSDF model, the upper and lower surface pressure coefficient curves can be captured, which allows for the deterministic extraction of shock descriptors, i.e., the shock position along with the pressure jump. A comprehensive uncertainty analysis is performed to measure the reliability of the surrogate model for 500 different sample scenarios

and evaluates the model’s ability for the critical aerodynamic coefficients (lift and drag) along with the shock-related parameters. The surrogate model demonstrated a high degree of reliability concerning the coefficients of lift and drag, with respective MAE/RMSE values of 0.00474/0.00602 and 4.66×10−4/6.33×10−4. Additionally, the model provided accurate results concerning the shock-related parameters with regards to its magnitude and position, achieving values of 0.00201/0.01598 and 0.00200/00.00336, respectively. These results indicate a strong capability of the surrogate model in capturing trends concerning the intensity of the shock. Yet, the model did have some limitations when establishing exact prescriptions of the shock position for all test cases. This methodology utilizes the integration of

a sophisticated surrogate modeling along with closed-loop CFD (computational fluid dynamics) verification to improve on the level of efficiency and reliability when optimizing the design of transonic airfoils.

Message: Hi FE, I need help with “Shock-Aware Constrained Optimization of the RAE2822 Transonic Airfoil via a Two-Channel vSDF Surrogate with Closed-Loop CFD Verification” in “Aerospace Engineering”