Present work devotes to complex development of multiphase gas dynamics model with chemical reactions in both phases and to applying experienced approaches to three-dimensional problems of intermediate ballistics for rocket and gun systems. Particular attention is devoted to complicated geometry and import from CAD/CAE systems as well as complicated 3D flows visualization. The adequacy of the computational procedure describing intermediate ballistics processes is supported by way of comparing the calculated data with experimental ones. The solution of system of equations is based on an explicit version of the finite volume technique using uniform Cartesian grids.
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