STAR-CD 4.26 improves accuracy to predict NOx and soot emissions. (Image courtesy of CD-adapco.)
Thanks to an updated NORA NOx emissions model, users of STAR-CD will be able to determine how to reduce the release of these pollutants.
NOx refers to the NO and NO2 released into our atmosphere. They are known lung irritants which put those with respiratory issues at risk. Other more serious consequences of NOx gases are when they react with other common chemicals and pollutants in the atmosphere to create acid rain, ozone and various toxic nitrates.
By studying an engine's probability to release NOx early in the design cycle using simulation software like STAR-CD, engineers can better ensure that the final product can limit the release of these chemicals.The new release also improves an engineer's ability to model the soot emissions using the Soot Sectional Method. This will also help to predict reductions of the pollutants released by ICE designs.
To further improve the accuracy of ICE simulations, users will also be able to access the coding of:
- NORA NOx source terms
- Soot Sectional Method source terms
- Bai droplet model impingement regimes
- AKTIM ignition criteria
Engineers will also note the improvements to the advanced Wiebe model, which can now expand the scope and improve the accuracy of the results under a wider range of operating conditions and combustion scenarios.
Other improvements to STAR-CD include:- Improved estimation of knock and post-knock heat release using the Zonal Auto-ignition/Knock option for the TKI ECFM-3Z combustion model
- Faster setup of multi-fuel simulations using internal or external TKI and LFS tables in the ECFM-3Z combustion model
- New workflow to assign fuel injector spray setup