The study encompasses an efficient CFD methodology for simulating weapon bay flows, which results in more than 90% computational efficiency than the commonly-used DES method and superior accuracy compared to the industry standard RANS approach. In particular, several scale-adaptive simulation (SAS) variants are tested for an open cavity configuration under transonic conditions and compared against DES results and experimental data. The study investigates the efficacy of SAS models in predicting cavity spectra with high computational efficiency compared to wall-resolved DES models. Combining SAS with wall functions (SAS-WF) led to over-prediction of modal magnitudes due to strong vortical structures inside the cavity. In order to address this, a forcing feature was employed to resolve turbulent structures, yielding results comparable to wall-resolved SAS and reference DES results. It also explores Rossiter modes under sideslip conditions, revealing significant interference of waves in highly three-dimensional flow. It is observed that the skewed shear-layer dynamics primarily influence Mode 1, while higher modes exhibit fewer skewed shear-layer characteristics and include spanwise reflecting waves. Besides streamwise waves, there is notable wave interference in the spanwise direction due to flow impingement on the leeward door. Furthermore, the study presents a detailed numerical investigation of double- and triple-delta wing configurations under transonic flow conditions using the k-w SST and SAS turbulence models, focusing on leading-edge vortical flows. It investigates the responses of double-delta and triple-delta wings to vortex breakdown and shock buffet at an angle of attack of 20 degrees. The double-delta wing experiences shock-induced vortex breakdown, leading to transient adjustments in the shock position and resulting in a shock buffet. In contrast, the breakdown in the triple-delta wing is associated with a stationary shock induced by the wing’s planform kink. Using the SAS model, a quasi-periodic oscillation of the pitching moment is observed in the triple-delta wing, revealing the evolution of the lambda shock. Analysis of the enstrophy transport equation suggests that the lambda shock drives vortex breakdown in the double-delta wing. These findings highlight the complex interplay between shock-induced effects and vortex dynamics, providing insights into the aerodynamic behaviour of these wing planforms.    «

The study encompasses an efficient CFD methodology for simulating weapon bay flows, which results in more than 90% computational efficiency than the commonly-used DES method and superior accuracy compared to the industry standard RANS approach. In particular, several scale-adaptive simulation (SAS) variants are tested for an open cavity configuration under transonic conditions and compared against DES results and experimental data. The study investigates the efficacy of SAS models in predicting...    »