PeleLM-FDF large eddy simulator of turbulent reacting flows
PeleLM-FDF large eddy simulator of turbulent reacting flows
复制标题
PeleLM-FDF 湍流反应流大涡模拟器
DOI：
10.1080/13647830.2022.2142673
复制
发表时间：
2022-01
影响因子：
1.3
通讯作者：
A. Aitzhan;S. Sammak;P. Givi;A. Nouri
中科院分区：
文献类型：
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作者：
A. Aitzhan;S. Sammak;P. Givi;A. Nouri
发展了一种新的计算方法PeleLM-FDF，用于复杂湍流燃烧系统的高保真大涡模拟。这种方法是通过一个混合方案相结合的欧拉PeleLM基流求解器与拉格朗日蒙特卡罗模拟器的过滤密度函数（FDF）的次网格尺度反应标量。由此产生的方法是能够模拟一些最复杂的物理复杂的燃烧相互作用。这是证明了一个非预混CO/H随时间演变的射流火焰的LES。通过骨架动力学模型的化学建模，并通过对直接数值模拟（DNS）的数据相同的火焰后验比较的结果进行评估。观察到良好的协议的各种统计的热化学量的时间演化，包括多标量混合的流形。新的方法是能够捕捉复杂的现象的火焰熄灭和重新点燃的计算成本的DNS的1/512。新的PeleLM-FDF求解器的高保真度和计算负担能力保证其考虑实际湍流燃烧系统的LES。
A new computational methodology, termed ‘PeleLM-FDF’ is developed and utilised for high fidelity large eddy simulation (LES) of complex turbulent combustion systems. This methodology is constructed via a hybrid scheme combining the Eulerian PeleLM base flow solver with the Lagrangian Monte Carlo simulator of the filtered density function (FDF) for the subgrid scale reactive scalars. The resulting methodology is capable of simulating some of the most intricate physics of complex turbulence-combustion interactions. This is demonstrated by LES of a non-premixed CO/H temporally evolving jet flame. The chemistry is modelled via a skeletal kinetics model, and the results are appraised via a posteriori comparisons against direct numerical simulation (DNS) data of the same flame. Excellent agreements are observed for the time evolution of various statistics of the thermo-chemical quantities, including the manifolds of the multi-scalar mixing. The new methodology is capable of capturing the complex phenomena of flame-extinction and re-ignition at a 1/512 of the computational cost of the DNS. The high fidelity and the computational affordability of the new PeleLM-FDF solver warrants its consideration for LES of practical turbulent combustion systems.