In this article a numerical study of the vortical flows around a delta-shaped wing, with and without canard, is undertaken by solving the Euler equations, The analysis elucidates the essential physics that are involved in establishing the complex vortical flows around the configurations, especially with the required radial pressure gradients that provide the accelerating forces for spiraling, Further emphasis is put in studying the now gradients arising over the wing surface and along the vortex axis, An interesting physical feature is the occurrence of two saddle points on the vortex axis at high angles of incidence, one causing now reversal and the other the vortex bursting, The beneficial effect of the canard vortex on the wing vortex has been clearly demonstrated, it leads to a significant retardation of the vortex bursting, All essential experimental findings known until now have been closely reproduced, and thus, confirmed and elucidated hy the numerical results.
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