The Direct Numerical Simulation (DNS) is one of the most suitable tools for a comprehensive analysis of fluid dynamic problems of engineering interest. Nowadays, direct simulation is used to analyse flow configuration confined in small domains, due to the need of a large amount of computational resources. Hence, from a practical point of view, DNS is a computational method for testing the validity and accuracy of turbulent models and for tuning the values of the model-constants of such models. In this paper, DNS is used to study the mixing of two gaseous streams at different velocities. Such a problem is encountered in Diesel engines during the injection process. The validity of such an approach has been proven by comparing the numerical results with experimental measurements available in literature.
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