The simulation in CFD Fluent 6.0 to predict NO and CO emissions of a cold start CNGV with catalytic converter were done without coupling with extra CFD modules.
The transient thermal distribution of the catalytic converter in cold start operation was simulated satisfactorily in CFD.
The simulation program also predicted the light-off temperature of NO conversion at 583K and CO conversion at 523K in cold start operation within the ranges of measured value presented in the literature.