Bluff-body stabilized turbulent premixed flames represent a challenging canonical configuration for computational simulation and validation. Past simulation results from many research groups on the same bluff-body flame test case demonstrate significant variation that is neither fully understood nor quantified. To identify potential sources of this variation, three categories of sensitivities are assessed for a stable combustion bluff-body flame test case: exit boundary conditions, turbulent combustion closure models, and grid resolution. Comparisons with experimental data are presented, and an analysis of the causes of the discrepancies is informed by the sensitivity analysis. Specifically, low grid sensitivities at the finest resolution indicate that notable discrepancies with the experiment are likely due to model or boundary condition errors. All three categories of sensitivities are identified as significant, and the dominant source of variation in the results depends on the resolution and flow variable of interest. In spite of a lack of thermoacoustic oscillations, exit boundary condition effects are shown to be substantial, and errors in velocity statistics are minimized by extending the computational domain into the exhaust region.

钝体稳定的湍流预混火焰代表了用于计算仿真和验证的具有挑战性的规范配置。许多研究小组在相同的钝体火焰测试用例上的过去模拟结果显示出巨大的变化，既没有完全理解也没有量化。为了确定这种变化的潜在来源，针对稳定的燃烧钝体火焰测试案例评估了三类敏感度：出口边界条件，湍流燃烧封闭模型和网格分辨率。提出了与实验数据的比较，并通过敏感性分析提供了导致差异的原因的分析。具体而言，在最佳分辨率下较低的网格灵敏度表明，由于模型或边界条件错误，与实验的显着差异很可能会导致。所有这三类灵敏度都被认为是重要的，结果变化的主要来源取决于所关注的分辨率和流量变量。尽管缺乏热声振荡，但出口边界条件的影响仍然很明显，并且通过将计算域扩展到排气区域，可以最大程度地减小速度统计误差。