Aftertreatment System

February 3, 2015

Jenny Hessler

To achieve Tier and Euro emissions compliance with minimal impact on efficiency, system size, and maintenance, Convergent Science has developed an aftertreatment simulation approach for on- and off-road urea/selective catalytic reduction (SCR) systems that combines spray, wall-interaction, chemistry, and heat transfer models with automatic meshing. Built for in-cylinder simulations, the approach is suited for urea/SCR systems with transient sprays that impact mixers, potentially producing liquid films resulting in solid urea deposits. Convergent’s approach gives designers the flexibility to change geometry and exhaust system layout to improve performance. The use of computer simulation and code reduces aftertreatment system design time; in-cylinder combustion modeling timeframes are shortened by replacing user-defined meshing with the automated mesh generation process.