论文标题
PELELM-FDF大型涡流燃烧器
PeleLM-FDF Large Eddy Simulator of Turbulent Combustion
论文作者
论文摘要
一种新的计算方法，称为“ PELELM-FDF”，并用于复杂湍流燃烧系统的高保真大型涡流模拟（LES）。该方法是通过将Eulerian Pelelm碱基流求解器与滤波器密度函数（FDF）的Lagrangian Monte Carlo模拟器相结合的混合方案来构建的，用于亚网格尺度反应性标量。所得的方法能够模拟复杂湍流 - 燃烧相互作用的一些最复杂的物理。这是由非验证的co/h $ _2 $暂时进化的喷气火焰的LE所证明的。化学是通过骨骼动力学模型对化学建模的，并且通过详细信息对结果进行了与同一火焰的直接数值模拟（DNS）数据进行评估。在热化学量的各种统计数据的时间演变中，观察到了出色的协议，包括多量表混合的歧管。新方法能够在DNS的计算成本的1/512下捕获复杂的火焰渗透和重新点燃现象。新PELELM-FDF求解器的高保真度和计算负担能力值得考虑实用的湍流燃烧系统。
A new computational methodology, termed "PeleLM-FDF" is developed and utilized for high fidelity large eddy simulation (LES) of complex turbulent combustion systems. This methodology is constructed via a hybrid scheme combining the Eulerian PeleLM base flow solver with the Lagrangian Monte Carlo simulator of the filtered density function (FDF) for the subgrid scale reactive scalars. The resulting methodology is capable of simulating some of the most intricate physics of complex turbulence-combustion interactions. This is demonstrated by LES of a non-premixed CO/H$_2$ temporally evolving jet flame. The chemistry is modelled via a skeletal kinetics model, and the results are appraised via detail 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.
