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Diesel engine simulations

Diesel engine simulations are realised using the Dacolt FGM combustion model [1,2], implemented in the Open Source CFD software OpenFOAM®. The associated look-up tables are generated with Tabkin®, using the detailed LLNL n-heptane [2] reaction mechanism. The video shows the evolution of the mixture fraction and temperature fields, and the temperature as function of mixture fraction in the scatter plot. Fuel injection, fuel / air mixing, auto-ignition, flame propagation, flame stabilisation and mixture burn-out are all well captured.

Combustion cycle



Top left: Mixture fraction Z; bottom left: temperature T; right: T(Z) scatter plot
- Engine data courtesy of FPT Industrial.


The images below illustrate the added value of using Dacolt FGM for Diesel engine combustion. The pressure curves show good agreement with the experiment. The ignition events of the pilot injection (-14 CA) and main injection (-5 CA) are very well captured. Once the flame comes to the wall at Top Dead Center, some deviations are observed in terms of heat release and wall heat loss, which is currently under investigation. Dacolt FGM does not have any tuning parameters and the model response solely depends on the mixing field computed by the CFD code and the chemical kinetics used to generate the look-up table.

Pressure, heat release rate and wall heat flux
- Engine data courtesy of FPT Industrial.

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  1. Tap, F. and Schapotschnikow, P., SAE Technical Paper 2012-01-0152, 2012
  2.  G. D'Errico et al., SAE Technical Paper 2015-01-0375, 2015
  3. Curran, H. J., Gaffuri, P., Pitz, P., and Westbrook,C. K., Combust. Flame 114:149-177 (1998)


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