Mitigating Urea Deposits in Aftertreatment Systems with CONVERGE to Meet Rapid Prototyping Schedules

December 12, 2018 10:00 AM – 11:00 AM CST


Dan Maciejewski, Senior Research Engineer – Applications
Convergent Science, Inc.

Scott Drennan, Aftertreatment Applications Director
Convergent Science, Inc.


Learn how to employ a new accelerated approach in CONVERGE for accurate urea deposit modeling with detailed chemistry and advanced filming to achieve simulation runtimes that meet your fast-paced Urea/SCR aftertreatment design process.

Urea deposits in Urea/SCR aftertreatment systems are a primary concern for design engineers. Urea deposits form when films are in a narrow temperature range where hard crystalline species such as Ammelide or Cyanuric Acid (CYA) form due to the decomposition of urea. These crystalline species are exceedingly difficult to remove once they form and require very high temperatures to decompose. Computational Fluid Dynamics (CFD) tools can provide valuable design information to mitigate urea deposit formation if the tool is both accurate and fast enough to meet tight design schedules.  Traditional CFD approaches use empirical models to extrapolate the risk of deposit formation from simple urea decomposition chemistry. However, these simple decomposition approaches do not actually predict the formation of deposit crystals. Detailed decomposition of urea in CFD offers the promise of moving from empirical predictions of risk to actual predictions of deposit formation through detailed chemistry. Typically, deposit formation prediction with CFD tools has been too slow to simulate aftertreatment systems for time-scales on the order of many minutes in a reasonable time frame.  

Join us for a webinar to learn how new acceleration techniques for Urea/SCR CFD modeling in CONVERGE now provide the ability to simulate many minutes of runtime with detailed decomposition of urea for deposit prediction. You will learn how CONVERGE can provide accurate predictions of wall and film temperatures by utilizing advanced spray modeling with detailed decomposition of urea to achieve simulation times of up to one minute per day.  We will review fundamental and real life validations of spray-wall interactions and detailed urea decomposition and deposit formation using the accelerated simulation approach.

Who should attend:

  • Design engineers concerned about mitigating urea deposits in Urea/SCR systems
  • Engine aftertreatment system engineers
  • CFD modeling engineers for Urea/SCR systems
  • Product managers for powertrain and aftertreatment