30 credits - Development of Chemical reaction models in 3D CFD simulations for aftertreatment system

Sodertalje, Stockholm
den 8 oktober 2019
den 31 oktober 2019
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Thesis project at Scania is an excellent way of making contacts for your future working life. Many of our current employees started their career with a thesis project.

Scania works continuously to develop internal combustion engines which can achieve low pollutant emissions and high efficiency. One effective way is using Selective Catalytic Reduction (SCR) substrate as part of the aftertreatment system, to reduce Nitrogen oxides (NOx). To create a better understanding of the next generation SCR substrate design, synergy effects between simulation and engine test must be investigated.

To develop simulation model for the complete aftertreatment system, the overall NOx conversion performance has to be included. By integrating the SCR chemical reaction equations into the 3D-fluid dynamics simulations, NOx conversion and excess amount of reductant (NH3) can be predicted. This enables faster engine cell tests validation and aftertreatment system design process.

The target of this thesis work is to further develop the simulation methodology developed by the previous master thesis work and apply to automatically include the chemical reactions required for NOx Conversion and Ammonia slip CFD simulation over the SCR. The purpose of the methodology is to be able to simulate a large number of different exhaust aftertreatment system layouts faster and with acceptable level of accuracy.

The focus of this thesis is to develop a method for implementing chemical reactions in 3D CFD simulation. The methodology must apply correct calibration of SCR-substrates as well as validation against experimental data.

The focus of this project is to:
  • Develop a method to automatically analyze NOx Conversion and Ammonia Slip.
  • Validate the method by comparing steady state and transient simulation against rig test.
  • Present and document the methodology.

  • Education:
    Masters student in mechanical, chemical and physical engineering, or similar.

    Number of students: 1
    Start date: January 2020
    Estimated time needed: 20 weeks

    Contact persons and supervisors:
    Zemichael Yitbarek NXPS, supervisor +468 553 53478
    Kim Petersson NXPS, manager +468 553 82524

    Your application should contain a covering letter, CV and transcripts.
    Selections will be made throughout the application period.

    Scania is a world-leading provider of transport solutions. Together with our partners and customers we are driving the shift towards a sustainable transport system. In 2018, we delivered 88,000 trucks, 8,500 buses as well as 12,800 industrial and marine engines to our customers. Net sales totalled to over SEK 137 billion, of which about 20 percent were services-related. Founded in 1891, Scania now operates in more than 100 countries and employs some 52,000 people. Research and development are concentrated in Sweden, with branches in Brazil and India. Production takes place in Europe, Latin America and Asia, with regional production centres in Africa, Asia and Eurasia. Scania is part of TRATON SE. For more information visit:

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