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Research was conducted on a method for the simulation of the diffusion of pressurized hydrogen leaking at high speed from a small opening into the complexly shaped space of a fuel cell electric vehicle with a practicable calculation time. The fact that the scale of the calculations was large and the calculation time was therefore extended represented issues in relation to this simulation method. The reduction of calculation time through the use of a three part partitioning method was proposed in order to resolve this issue. In this method, the calculation region is divided into three: In the first part, steady-state compressible flow calculations are conducted for the region close to the hydrogen outlet where the Mach number is higher than 0.5.