Different combustion models for large eddy simulation, including the quasi-laminar (QL), Eddy dissipation concept (EDC), and partially stirred reactor (PaSR) models, are assessed at various filter widths using direct numerical simulation (DNS). The DNS database is lean hydrogen-air turbulent flame across a wide range of Karlovitz numbers (5–239). Overall, the PaSR model performs best, except for small filter width and medium Karlovitz number conditions. The performance of the EDC model is very similar to the QL model at a relatively low turbulent Reynolds number. It is highlighted that both the EDC and PaSR models are suitable for high turbulent Reynolds number and medium Karlovitz number conditions. Theoretical analysis is carried out to explain the current observations and predict the models’ behaviors with the variation of turbulent intensity, combustion intensity, and grid resolution. Implications of the present results for modeling are highlighted.

使用直接数值模拟 (DNS) 在各种过滤器宽度下评估用于大涡模拟的不同燃烧模型，包括准层流 (QL)、涡耗散概念 (EDC) 和部分搅拌反应器 (PaSR) 模型。DNS 数据库是在广泛的 Karlovitz 数 (5–239​​) 上的贫氢空气湍流火焰。总体而言，PaSR 模型表现最好，除了小滤波器宽度和中等 Karlovitz 数条件。在湍流雷诺数相对较低的情况下，EDC 模型的性能与 QL 模型非常相似。需要强调的是，EDC 和 PaSR 模型都适用于高湍流雷诺数和中等卡洛维茨数条件。进行理论分析以解释当前观察结果并预测模型随湍流强度变化的行为，燃烧强度和网格分辨率。突出显示了当前结果对建模的影响。