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The computational fluid dynamics code SOFIE has been used for three-dimensional unsteady simulation of experimental fire in the tunnel with sizes 21xl.5xl.6 m performed previously by Japanese researchers. The steady and unsteady burning rate approaches were used for numerical modeling. It has been shown that the computed flow velocities and temperature distribution for unsteady, growing in time, burning rate are in better correspondence to the experimental data. It is shown that an approach to the description of burning rate influences significantly on the magnitude and the distribution of heat fluxes in the enclosure, that is important in particular for solving the fire resistance problem.