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<p>This work presents a flame resolved direct numerical simulation (DNS) and three Large Eddy Simulations (LES) of the bluff-body stabilized turbulent premixed <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\textrm{H}_{2}\)</EquationSource> </InlineEquation>-air flame experimentally studied at NTNU. The DNS are compared to experimental data, and the velocity fields, heat release rate, and OH distributions, show good overall agreement. An Optimal Estimator analysis is conducted in order to identify the set of progress variables most suited to represent the thermochemical states present in the DNS on a tabulated manifold. The resulting progress variable set is used to construct a tabulated manifold through 1D unstretched laminar flamelets, which is combined with a consistent FTACLES formulation to conduct three Large Eddy Simulations (LES) of the same burner. The three LES, differing in the subgrid wrinkling model considered, show a good agreement with the DNS velocity fields, but fail in reproducing correctly the heat release rate and the <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\( Y_{\textrm{OH}}\)</EquationSource> </InlineEquation> distribution, while consistently overpredicting the temperature values. These findings, combined with the analysis of the joint Probability Density Functions of the LES, suggest that the inclusion of a wrinkling factor is not enough for the correct reproduction of the flame with the adopted formulation, and strained flamelets should be included in the generated manifold.</p>

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Flame-Resolved and Filtered Tabulated-Chemistry Simulations of a Turbulent Bluff-Body Stabilized Premixed Hydrogen-Air Flame

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月21日

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  • Chiara Matteucci,
  • Davide Cavalieri,
  • Davide Schintu,
  • Pasquale Eduardo Lapenna,
  • Francesco Creta

摘要

This work presents a flame resolved direct numerical simulation (DNS) and three Large Eddy Simulations (LES) of the bluff-body stabilized turbulent premixed \(\textrm{H}_{2}\) -air flame experimentally studied at NTNU. The DNS are compared to experimental data, and the velocity fields, heat release rate, and OH distributions, show good overall agreement. An Optimal Estimator analysis is conducted in order to identify the set of progress variables most suited to represent the thermochemical states present in the DNS on a tabulated manifold. The resulting progress variable set is used to construct a tabulated manifold through 1D unstretched laminar flamelets, which is combined with a consistent FTACLES formulation to conduct three Large Eddy Simulations (LES) of the same burner. The three LES, differing in the subgrid wrinkling model considered, show a good agreement with the DNS velocity fields, but fail in reproducing correctly the heat release rate and the \( Y_{\textrm{OH}}\) distribution, while consistently overpredicting the temperature values. These findings, combined with the analysis of the joint Probability Density Functions of the LES, suggest that the inclusion of a wrinkling factor is not enough for the correct reproduction of the flame with the adopted formulation, and strained flamelets should be included in the generated manifold.