TNF Workshop Abstract

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TNF Workshop Abstract

This workshop is an open and ongoing international collaboration among experimental and computational researchers in turbulent combustion. The current emphasis is on fundamental issues of turbulence-chemistry interactions in gaseous flames. The objectives are to:

Establish an internet library of well-documented flames that are appropriate for model validation and the advancement of basic scientific understanding of turbulent combustion.
Provide a framework for collaborative comparisons of measured and modeled results.
Identify priorities for further experimental and computational research.

The TNF library includes multiscalar and velocity data from several flows and flames that carry through a progression in complexity of the chemistry and the flow field. Having started with simple jet flames of hydrogen, our attention has moved to flames of simple hydrocarbon fuels (methane, natural gas, and methanol), which include modeling challenges such as local extinction and re-ignition, detached or lifted reaction zones, auto-ignition, flow recirculation, and swirl.

Areas of increasing interest include combustion of more complex fuels and development of models that can address a broad range of combustion regimes, including nonpremixed, partially-premixed, stratified, and premixed flames. The selection of target flames and focus topics for future TNF Workshops will be based on the scientific interests of the organizers and active participants.

Past Workshops and main topics:

Naples, Italy	1996	TNF1	Establish framework
Heppenheim, Germany	1997	TNF2	Hydrogen jet flames and NO formation
Boulder, Colorado, USA	1998	TNF3	Piloted and bluff-body flames with CH4
Darmstadt, Germany	1999	TNF4	Extinction/re-ignition in piloted flames
Delft, Netherlands	2000	TNF5	Chemistry, mixing, and radiation submodels
Sapporo, Japan	2002	TNF6	Mixing models, bluff-body and swirl flames, new experiments
Chicago, Illinois, U.S.A.	2004	TNF7	Scalar dissipation, extinction and re-ignition, bluff-body and swirl flames, LES and DNS.
Heidelberg, Germany	2006	TNF8	Bluff-body and swirl flame comparisons, dissipation scales in flames, LES quality assessment, DNS, considerations for premixed model validation
Montreal, Canada	2008	TNF9	Planning for extension of model validation work to include a broader range of combustion modes and more complex hydrocarbon fuels, LES quality assessment, issues for comparing experiments and LES
Beijing, China	2010	TNF10	Overview on lifted flames in hot coflow, modeling approaches for partially premixed flames, stratified flame comparisons, progress on kinetics and diagnostics for DME and ethanol, best practice in LES.
Darmstadt, Germany	2012	TNF11	Stratified and premixed flame comparisons, differential diffusion in premixed flames, lifted flames, DME flames and chemistry, Oxy-fuel and MILD combustion, temporally resolved data, LES/DNS quality, opposed jet flames.
Pleasanton, California, USA	2014	TNF12	Stratified flame comparisons, turbulent opposed jet flames, piloted DME flames, utilizing temporally-resolved data, enclosed and unsteady combustion, flame-wall interaction, LES quality and UQ, modeling of DNS cases
Seoul, Korea	2016	TNF13	Stratified flams update, Sydney piloted flame comparisons, progress variable and regime indicators, piloted DME flames, turbulent counterflow flames, flame-wall interaction, new burners, experiments and simulations at elevated pressure.

Contact:

For additional information or to be included on the TNF email distribution contact Robert Barlow (barlow@sandia.gov)

Acknowledgements:

Technical contributions to this site by the organizers and participants of the workshop series are gratefully acknowledged. Sandia's role in coordinating TNF Workshop activities is supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences.