2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/85226The article take up two-dimensional subalgebras from optimum system of algebra $L_{13}$, which is deduce from the gas dynamics equations. We calculated invariants and constructed invariant submodels for two-dimensional sabalgebras. Then invariant submodels are reduce to one of canonical types: evolutionary or stationary.12 pages, AmsTeXFluid Dynamicstext