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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Relationships between Physical and Fourier Space for Large-Eddy Simulation of Premixed Turbulent Combustion: Multi-Dimensional Fourier Decomposition.
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Relationships between Physical and Fourier Space for Large-Eddy Simulation of Premixed Turbulent Combustion: Multi-Dimensional Fourier Decomposition.

机译：APS-流体动力学APS分部第70届年会-事件-预混湍流燃烧大涡模拟的物理和傅立叶空间之间的关系：多维傅立叶分解。

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Large Eddy Simulation (LES) is a powerful formulation to model turbulent reacting flows with tradeoffs between complexity and resolution. LES assumes that all energy-dominated turbulence motions are well-resolved and forward cascade-dominant so that modeled effects of Sub-Filter-Scale (SFS) motion are second order. However, the application of this scale-based decomposition to reacting turbulent flows is not straightforward since dynamically important kinetics within thin flame regions are mostly SFS. We aim to systematically refine understanding of the relationships between physical and scale space for LES of premixed turbulent combustion, beginning with reduced-physics simulations of the interactions between single-scale vortex arrays and laminar premixed flames. We apply Fourier scale-based decomposition where interpretation in inhomogeneous directions is unclear and where periodic extension of the finite domain in those directions produce boundary discontinuities. We present a strategy to remove the pollution to the signal from these discontinuities with minimal modification of the original signal by systemically isolating their spectral content. The procedure is applied to a 2D vortex-flame interaction where we demonstrate 2D Fourier-physical space relationships in homogeneous and inhomogeneous directions. extit{Supported by AFSOR.}
机译：大涡模拟（LES）是一种功能强大的公式化模型，可以在复杂性和分辨率之间进行权衡，从而对湍流反应流进行建模。 LES假设所有能量主导的湍流运动都得到了很好的解析，并且正向级联为主，因此次级过滤器尺度（SFS）运动的建模效果是二阶的。但是，将这种基于标度的分解应用于湍流的反应并不简单，因为稀薄火焰区域内的动态重要动力学主要是SFS。我们旨在系统地完善对预混湍流燃烧LES的物理空间和尺度空间之间关系的理解，首先是对单尺度涡旋阵列与层流预混火焰之间相互作用的简化物理学模拟。我们应用基于傅里叶标度的分解方法，其中在不均匀方向上的解释不清楚，并且在这些方向上有限域的周期性扩展会产生边界不连续性。我们提出了一种策略，通过系统地隔离其频谱内容，以最小的修改原始信号来消除这些不连续性对信号的污染。该程序应用于二维涡旋-火焰相互作用，我们在均匀和不均匀方向上演示了二维傅立叶-物理空间关系。 extit {由AFSOR支持。}

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