APPLICATION OF THE RNG k-ε MODEL TO THE ANALYSIS OF FLOWS AND SPRAY CHARACTERISTICS

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Abstract
This article studies the applicability of the renormalization group (RNG) k-ε model to analysis of flows with spray characteristics. Predicted results using the (RNG) k-ε model of three complex flows, i.e., flow over a backward-facing step and over a blunt flat plate, and flow around a semi-3D model car, are compared with those from the standard k-ε model and experimental data. The results of the spray characteristics in the chamber of a direct-injection model engine are compared with those from the modified k-ε model and experimental data. The results of reattachment length, separated eddy size, and average surface pressure distribution using the RNG k-ε model show more reasonable trends compared with the experimental data than results using the k-ε model. The eddy viscosity predicted using the modified k-ε model in the spray region is significantly larger than that using the RNG k-ε model. Spray tip penetration predicted using the RNG k-ε model is closer to the experimental data than that using the modified k-ε model. The application of the RNG k-ε model seems to have some potential for simulations of spray characteristics, e.g., spray tip penetration, spray tip velocity, and droplet distribution, over the modified k-ε model.

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