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LES/FMDF of premixed methane/air flow in a backward-facing step combustor

机译：LES / FMDF在向后步进燃烧器中预混合的甲烷/空气流

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In the present study, a hybrid Eulerian-Lagrangian methodology is utilized for large eddy simulation (LES) of premixed fuel/air flow over a three-dimensional backward facing step (BFS). The fluid dynamic features are obtained by solving the Eulerian filtered compressible transport equations while the species are predicted by using the filtered mass density function method (FMDF). Some scalar fields are duplicated in FD and MC solvers to examine the numerical consistency between them. A good agreement is achieved by comparing the essential characteristics of the BFS flow (such as the mean and RMS values of the velocity and temperature fields and also the reattachment length) obtained from numerical results with the measurements. This ensures that the proposed hybrid method is reliable for studying the reacting flow in relatively complex combustion systems. Additionally, the performance of several SGS models are assessed, and the results indicate that the dynamic Smagorinsky and WALE models are superior to standard Smagorinsky and MKEV models.
机译：在本研究中，混合的欧拉-拉格朗日方法被用于三维后向台阶（BFS）上的预混合燃料/空气流的大涡模拟（LES）。通过求解欧拉滤波的可压缩输运方程获得流体动力学特征，同时使用滤波质量密度函数方法（FMDF）预测物种。某些标量字段在FD和MC求解器中重复，以检查它们之间的数值一致性。通过比较从数值结果获得的BFS流量的基本特征（例如速度和温度场的均值和RMS值以及重新连接长度），可以达成良好的协议。这确保了所提出的混合方法对于研究相对复杂的燃烧系统中的反应流是可靠的。此外，评估了几种SGS模型的性能，结果表明动态Smagorinsky和WALE模型优于标准Smagorinsky和MKEV模型。

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