Computation of roll moment for projectile with wraparound fins using Eulerequation

Flowfield solutions of a projectile with wraparound fins have been computed in a supersonic region with a time-marching, three-dimensional Euler equat ion. The roll moment coefficients were computed from the flow-field solutio n and compared with the experimental results. The roll moment coefficient c omputations show good agreement with the experimental measurements for vari ous Eight Mach numbers. This shows that the Euler equations can give compar ably accurate solutions when computing the roll moment of wraparound fin co nfigurations. Comparing the flowfield solutions before and after the roll r eversal, the roll reversal at higher Mach number than Mach 1 is thought to be due to the effect of a compression/expansion wave from a neighboring fin . Through the comparison with the previous results, it is shown that the ti p shape, as well as the edge shape, has a significant effect on the roll mo ment of the wraparound fin.