Results of the three-dimensional simulation of the formation of a shaped-ch
arge jet and the piercing of a steel target by a charge with a star-shaped
liner are reported. The calculation results show the efficiency of the thre
e-dimensional numerical technique TREK-UP used and the possibility of its a
pplications to direct simulation of the problem considered. In addition, it
is shown that one can optimize star-shaped charges significantly with a vi
ew to reaching higher efficiency.