The program code for modeling the processes of special relativistic hydrodynamics is briefly described in the paper. The code is based on the author's library IPANEMA (I'm PArallel NEsted Mesh librAry) - the implementation of nested grids for architectures with shared and distributed memory. A brief description of a subset of the library for working with shared memory is presented in the paper. The results of numerical simulation of the central interaction of a relativistic jet with a dense gas cloud at various jet speeds are presented. A jet moves through a dense uniform gas and collides with a gas cloud, whose density exceeds ten times the background gas. The mechanism of dense clouds destruction when exposed to it by a relativistic jet is presented.