LEE-SIDE FLOW SIMULATIONS OF CRUCIFORM WINGBODY CONFIGURATIONS AT INCOMPRESSIBLE MACH NUMBERS

摘要

The lee-side flow was simulated for a circular wing-body combination with very low aspect ratio wings in the ‘+’ (plus) configuration at incompressible speeds. Two 2D engineering level methods, the discrete vortex model (DVM) and free vortex model (FVM) methods were utilized to simulate the flow for three different span to body diameter ratios, namely 1.25, 1.50 and 1.75. The results were compared to experimentally validated computational fluid dynamics (CFD) data in order to investigate the applicability of the two methods in predicting the aerodynamic loads as well as the vortex shedding. A comparison of the normal force and centre-of-pressure indicated that the DVM method correlates well with the CFD loads, whereas the FVM method is less suitable for span to body diameter ratios above 1.25.