English

DTIC ADA332881: Navier-Stokes Computations of Sabot Discard Using Chimera Scheme

Computational fluid dynamics calculations have been performed for a multibody system consisting of a main projectile and three sabot components. Numerical flow field computations have been made for various orientations and locations of sabots using an unsteady, zonal Navier-Stokes code and the Chimera composite grid discretization technique at M = 4.0 and alpha = 0. Computational grids have been obtained for the projectile and sabot independently and then overset to form the complete grid system. Computed results have been obtained for sabot angles of attack of 5, 10, 15, and 25. Computed results show the details of the expected flow field features including the shock interactions. Both larninar and turbulent computations for the 250 case predict similar results. Computed results for other sahot positions are compared with the experimental data obtained in Canada for the same configuration and conditions and are generally found to be in good agreement with the data.

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