Computation of the roll moment for a projectile with warp-around fins

Flowfield solutions of a projectile with wrap-around fins have been computed for velocities ranging from Mach 1.3 to Mach 3.0. The flowfield solutions were computed with a time-marching, three-dimensional, zonal, full Navier-Stokes code. The roll moment coefficient was computed from the flowfield solutions and compared to the roll moment coefficient obtained experimentally for a similar wrap-around fin projectile. The roll moment coefficient computations show favorable agreement with experimental measurements in predicting changes of the roll moment coefficient magnitude and sign as a function of the flight Mach number. This demonstrates computational fluid dynamics' capability as a promising method for reliably predicting the roll moment coefficient of projectiles with wrap-around fins. (Author)