APPLICATION OF VORTICITY CONFINEMENT TO INVISCID MISSILE FORCE AND MOMENT PREDICTION

The use of vorticity confinement techniques to predict missile forces and moments more accurately is demonstrated. An inviscid Cartesian grid CFD code was modified to include both field and surface vorticity confinement. The code was used to compute the forces and moments on missile geometries with and without vorticity confinement. Vorticity field confinement is shown to allow convection of discrete vortices without degradation due to numerical diffusion. Vorticity surface confinement is shown to soften the inviscid pressure field on the missile surface, allowing a viscous-like calculation for little more than the cost of an Euler calculation. Results are presented to show that these techniques can allow more accurate force and moment predictions from an Euler CFD code without resorting to a more expensive calculation.

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