Simulation of flow around a slender body at high angles of attack

LES of the flow around an ogive-cylinder body at high angles of attack were carried out to investigate the possibility of the development of asymmetric wake-vortex without the introduction of artificial perturbations. The study investigated the effect of grid resolution and scheme bias on the solution. The numerical solution was found to be sensitive to the bias in the numerical scheme. The simulation was carried for angles of attack alpha = 30 degrees, 40 degrees, 50 degrees, 55 degrees, and 60 degrees. The simulation at alpha = 30 degrees - 40 degrees produced symmetric wake-vortex. At alpha = 50 degrees, the wake-vortex is also symmetric but with vortex separation. At alpha = 55 degrees, the wake-vortex becomes asymmetric. At alpha = 60 degrees, the wake-vortex is highly asymmetric with vortex separation and breakdown. It was concluded that asymmetric flow around slender bodies at high angles of attack can be simulated in the absence geometrical or flow perturbations.