A Rapid, Robust, and Accurate Coupled Boundary-Layer Method for Cart3D

Abstract

An interactive boundary-layer method has been implemented within the Cart3D Euler solver. The implementation subscribes to the philosophy of automation and efficiency of the original Euler-based inviscid method. A quasi-simultaneous coupling algorithm has been applied to promote speedy convergence and robustness. A new interface between Cart3D and the boundary layer solver has been invented which further promotes robustness and accuracy. An elliptic solver for propagating the boundary layer solution between the 2-D strips has been developed that exhibits improved accuracy over traditional solvers. Results on airfoils, wings, and full aircraft configurations are shown and compared to Navier-Stokes solutions and experimental data. Conclusions are drawn as to the accuracy and practical application of the method.