Evgeniy Shapiro, Charles Turquand D'Auzay, Ignacio Hernandez, Realis Simulation
Fabian Mauss, Lars Seidel, Anders Borg, LOGEsoft
Kerstin Brandes-Grote, Volkswagen AG
Japan User Conference 2025

Detailed chemistry is crucial in internal combustion engine (ICE) simulations to capture fuel composition effects and pollutant formation. However, high computational costs limit its use. A new feature in VECTIS introduces a chemical clustering method that groups cells with similar thermo-chemical states, dramatically accelerating source term computation by up to 12 times, and cutting overall simulation time by up to 2.2 times. This breakthrough enables practical, high-fidelity fuel and emissions modelling across a broader range of powertrain development workflows.

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The results of this collaboration between Realis Simulation, Volkswagen AG and LOGE was presented by Evgeniy Shapiro at the 2025 Japan User Conference on 19 September 2025.