In order to assess the three-dimensional distributions of crucial parameters in a fuel cell stack under transient conditions, a stack model using CFD technique has been described. It has been shown that this method is capable of modeling the chemical and physical processes of a fuel cell stack in three-dimensional, time-dependent form. Furthermore, the grid definitions and the proposed simple test for a stack CFD package seem effective. The simulation-derived distributions of current and temperature under a step change of voltage appear to be reasonable.

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