The 17^th TNF Workshop will be held in Kyoto, Japan (July 2026) before the 41^st Symposium (International) on Combustion. 

The organizers expect that there will be several sessions dedicated to comparisons of LES simulations with experimental and/or DNS datasets targeting carbon free fuels (hydrogen and ammonia).  Target flames will be selected based on community interest and the availability of the data.  Several candidates were introduced during TNF16, as summarized in the New Target Flames section of the TNF16 Proceedings.

Next Steps

Four tasks were outlined in the TNF16 Summary to prepare for the next workshop.  Those wanting to contribute to any of these efforts should contact the listed coordinators.

1. Provide an overview of experimental target flames and data sets

Coordinators: Dreizler, Hasse (TU Darmstadt)

TU Darmstadt has prepared a brief description of one of their experimental configurations as an example.  (See link below).  This description can be used as a template by other groups.  Target flame descriptions can include both available data and future data with an approximate date when it can be shared with the TNF community.  Data can also include supporting numerical data, e.g., detailed flow conditions from an inflow-LES.  Descriptions will be made available on the TNF site. 

It is suggested that datasets should be assigned a DOI as a unique identifier.  New DOIs will be continuously added to the experimental descriptions and published on the TNF website.

2. Provide an overview of DNS target flames and data sets

Coordinator: Attili (University of Edinburgh)

Similarly, University of Edinburgh will prepare descriptions for their DNS configurations.  Following this template, TNF participants working on DNS are invited to provide the description of their own configurations.  

3. Aligning experimental/DNS work with modeling/LES between TNF16 and TNF17

Coordinators: Dreizler, Hasse (TU Darmstadt)

The descriptions for experiments and DNS will be shared with the TNF community interested in turbulent combustion model development and LES.  Each group will indicate which flames they will be working on for TNF17.  This information will be helpful for both the experimental and DNS groups to better plan their next steps.

4. Chemical kinetics for TNF target flames

Coordinators: Stagni (Politecnico di Milano), Magnotti (KAUST)

The current uncertainty in NH₃ kinetics and near-wall H₂ kinetics is a challenge for a consistent comparison of experiments/DNS and LES.  It is expected that mechanisms will improve in the near future and new versions will be released.  Feedback concerning NH₃ and near-wall H₂ kinetics should be given to A. Stagni.

When comparing to DNS data, the same mechanism should be used in LES.  When comparing to experimental data, suitable TNF-preferred mechanisms will be identified and suggested for LES use.  The suggestions will be shared with the TNF community and published on the TNF website.  

Descriptions of Potential Target Cases

Preliminary list.  PDF description files will be linked for download once they are available.

Experiments: 

• Lean Premixed H2/Air Jet Flames – TU Darmstadt
• Premixed NH3/H2/N2/Air Jet Flames – TU Darmstadt
• Nonpremixed NH3/H2/N2 Jet Flames at 5 atm – KAUST
• Piloted Jet Flames of NH3/H2/N2/Air – KAUST
• Piloted Inhomogeneous H2/N2 Jet Flames – U Sydney
• H2/Air Multi-Regime Burner (MRB) Flames – TU Darmstadt
• Premixed Bluff-Body-Stabilized H2/Air Flames – NTNU
• HYLON2 – IMFT/CERFACS and KAUST
• Lean Premixed H2/Air Sidewall Quenching Flame – TU Darmstadt

DNS: 

• Premixed H2/Air in a Box – Newcastle U
• Premixed H2/Air Slot Jet – RWTH Aachen U
• Premixed H2/Air Slot Jets at High Pressure – Edinburgh U
• Premixed H2/Air Temporal Shear Layer (1,10 atm) – Sandia/SINTEF
• Premixed NH3/H2/N2/Air Temporal Shear Layer – Sandia/SINTEF
• DNS of KAUST piloted Flame D – KYOTO U