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Dacolt FGM combustion model

The FGM combustion model is rapidly becoming a new industry standard for combustion modelling. Dacolt has implemented it's version of the FGM model (Dacolt FGM) in leading CFD software packages.

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Dacolt FGM combustion model


The FGM combustion model has two key advantages over existing combustion models:

  • Improved predictivity:
    • By using the largest, state-of-the-art reaction mechanisms;
    • By adding turbulence-chemistry interaction (TCI) effects.
  • Strongly reduced CPU cost through the use of chemistry tabulation techniques.

The FGM model relies on high-quality look-up tables which are computed a priori. Dacolt has developed Tabkin, a dedicated software package to create such look-up tables with detailed chemical kinetics. FGM is a simple, fast and predictive combustion model without any tuning parameters.

Dacolt FGM

In the past decade, Dacolt has developed Dacolt FGM, a robust and portable FGM implementation. Dacolt FGM is applicable to internal combustion engines, gas turbines and industrial burners and available for ANSYS® FLUENT®, OpenFOAM®, Converge and AVL FIRE®. Dacolt FGM is made available with a Tabkin license.

Dacolt FGM for internal combustion engines

Dacolt FGM has been extensively validated for Diesel engine applications [1,2]. Results from the ECN Spray A test case (Fig. 1) show the model's ability to capture key physics such like ignition delay, flame lift-off height but most importantly the flame structure is very well predicted. Engine simulations (Fig. 2) very well capture the ignition delay and heat release rate across the engine map. Spark ignition applications are currently being investigated, where the model's ability to capture flame front propagation in a stratified mixture has been confirmed in gas turbine combustor simulations. Read more on Dacolt FGM for ICE...

Dacolt FGM for gas turbines

Gas turbine model combustor simulations have been realised with the Dacolt FGM combustion model [3]. For turbulence, the Reynolds Stress Model (RSM) or Detached Eddy Simulation (DES) models are applied. The flame stabilisation point is very well reproduced (Fig. 3) and very good agreement is found for both major and minor species. Read more on Dacolt FGM for gas turbines...

Dacolt FGM for industrial burners

CFD simulations were realised to assess the impact of replacing Heavy Fuel Oil (HFO) with Biodiesel in a city heating furnace [4]. Surrogate model fuels were defined for HFO and Biodiesel. Detailed chemistry tables were generated with Tabkin, Dacolt’s dedicated software package for combustion chemistry look-up table generation. With the selected approach, the differences between the fuels, both in liquid properties and in chemical kinetics, were modeled with state-of-the-art techniques. The FGM model with Tabkin tables allowed to predict a lifted diffusion flame, stabilised in the correct location. The simulation results (Fig. 4) are in line with the findings from the measurement campaign. Read more on Dacolt FGM for industrial burners...

More information on Dacolt FGM

  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. M. Wankhede et al., Proceedings of ASME Turbo Expo 2014, GT2014-25784 (2014)
  4. F. Tap et al., Proceedings of INFUB-10 (2015)

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