SLUGLESS MULTIPLE HIGH VELOCITY PULSE SHAPED CHARGE JETS

THIS PROPOSAL IS TO APPLY COMPUTATIONAL FLUID DYNAMIC (CFD) SIMULATIONS TO DESIGN SLUGLESS HIGH VELOCITY PULSE SHAPED CHARGE WARHEADS FOR ARMOR PENETRATION. WE HVE DEVELOPED A NEW AND VERY NOVEL CODE ELPIC (EXTENDED LAGRANGIAN PARTICLE IN CELL CODE) WHICH OVERCOMES THE NORMALLY ENCOUNTERED DIFFICULTIES OF BOTH EULERIAN AND LAGRANGIAN CFD CODES FOR THESE PROBLEMS. USING THIS HIGHLY RELIABLE AND EFFICIENT COMPUTER CODE, WE HAVE ALREADY SUCCEEDED IN PRELIMINARY DESIGNS THAT COMBINE SPATIALLY-DISTRIBUTED SHAPED CHARGES IN A HIGHPRECISON SYNCHRONOUS ACTION IN NOVEL WAYS IN ORDER TO GENERATE PULSE SHAPED LINER JETS OF PRE-ORDAINED SHAPE AND PARAMETERS. IN PHASE I OF THIS SBIR PROGRAM, WE PROPOSE TO EXPLORE A TWO-DIMENSIONAL (CYLINDRICAL GEOMETRY) ELPIC MODEL WHICH WE BELIEVE CONTAINS THE SALIENT PHYSICAL FEATURES NECESSARY TO DESIGN AND PARAMETRIZE THE COMPLEX PROCESSES ASSOCIATED WITH MULTIPLE PULSE SHAPED CHRGE DESIGNS. WE SHALL ALSO USE RENORMALIZATION GROUP (RNG) METHODS, DEVELOPED RECENTLY BY US, TO GIVE A 'SUB-GRID-SCALE VISCOSITY' TO TREAT THE INTERACTION BETWEEN THE SHOCK AND FLUID TURBULENCE IN THE PROJECTILE IMPACT PROCESS. IN PARTICULAR, WE HAVE DEVELOPED THE 'ACTIVE SLUG TRAP PRINCIPLE' WHICH WE BELIEVE TO BE A KEY NEW IDEA FOR THE DESIGN OF MULTIPLE SLUGLESS PULSE SHAPED CHARGE PROJECTILES.