Simulation of Supersonic Flow about a Circular Cylinder (figure)Simulation of a 2-D Version of Sabot Discard

B. Kevin Edgar, S. E. Anderson, and Paul Woodward
Army High Performance Computing Research Center, Minneapolis, MN
Kurt Fickie
Army Research Laboratory, Aberdeen, MA

(full size: 445k)

We used our PPM gas dynamics code running at 8 Gflops on the AHPCRC's 512-node CM-5 Connection Machine to simulate a 2-D flow problem related to the process of sabot discard. In the two snap shots shown here, the central object represents the projectile, travelling at a constant speed of Mach 4 through air, and the obstacles above and below the projectile represent aluminum sabot "petals," which in this 2-D problem are actually slabs and which move according to the forces exerted on them by the surrounding flow. This flow was started impulsively and it is shown at two times during this highly transient process. In the upper half of each snap shot the density of the gas is displayed, while in the lower half the vorticity is shown. This calculation incorporates a new approach to performing simulations of such transient supersonic flows which we are exploring on massively parallel computers.

Vorticity using 5 million zones (top) 2 million zones (bottom) MPEG movie: 8MB

Vorticity Colorbar

Density using 5 million zones (top) and 2 million zones (bottom) MPEG movie: 12MB

Density Colorbar