Numerical simulation of the effects of variation of angle of attack and sweep angle on vortex breakdown over delta wings
Schiff, Lewis B.
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In the present investigation of the vortical flowfield structure over delta wings at high angles of attack, three-dimensional Navier-Stokes numerical simulations were conducted to predict the complex leeward flowfield characteristics; these encompass leading-edge separation, secondary separation, and vortex breakdown. Attention is given to the effect on solution accuracy of circumferential grid-resolution variations in the vicinity of the wing leading edge, and well as to the effect of turbulence modeling on the solutions. When a critical angle-of-attack was reached, bubble-type vortex breakdown was found. With further angle-of-attack increase, a change from bubble-type to spiral-type vortex breakdown was predicted by the numerical solution.
SEE A90-458458th AIAA Applied Aerodynamics Conference; Aug. 20-22, 1990; Portland, OR; United StatesApproved for public release, distribution unlimited
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