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首页> 外文期刊>Journal of Heat Transfer >Analysis of Radiation Modeling for Turbulent Combustion:Development of a Methodology to Couple Turbulent Combustion and Radiative Heat Transfer in LES
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Analysis of Radiation Modeling for Turbulent Combustion:Development of a Methodology to Couple Turbulent Combustion and Radiative Heat Transfer in LES

机译：湍流燃烧的辐射模型分析：LES中湍流燃烧和辐射传热耦合方法的发展

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摘要

Radiation exchanges must be taken into account to improve large eddy simulation (LES) prediction of turbulent combustion, in particular, for wall heat fluxes. Because of its interaction with turbulence and its impact on the formation of polluting species, unsteady coupled calculations are required. This work constitutes a first step toward coupled LES-radiation simulations, selecting the optimal methodology based on systematic comparisons of accuracy and CPU cost. Radiation is solved with the discrete ordinate method (DOM) and different spectral models. To reach the best compromise between accuracy and CPU time, the performance of various spectral models and discretizations (angular, temporal, and spatial) is studied. It is shown that the use of a global spectral model combined with a mesh coarsening (compared with the LES mesh) and a minimal coupling frequency N_(it) allows to compute one radiative solution faster than N_(it) LES iterations while keeping a good accuracy. It also appears that the impact on accuracy of the angular discretization in the DOM is very small compared with the impact of the spectral model. The determined optimal methodology may be used to perform unsteady coupled calculations of turbulent combustion with radiation.
机译：必须考虑辐射交换，以改善湍流燃烧的大涡模拟（LES）预测，特别是对于壁热通量。由于其与湍流的相互作用及其对污染物质形成的影响，因此需要进行不稳定的耦合计算。这项工作是迈向耦合LES辐射模拟的第一步，它是基于准确性和CPU成本的系统比较来选择最佳方法的。使用离散纵坐标方法（DOM）和不同的光谱模型可以解决辐射问题。为了在精度和CPU时间之间达成最佳平衡，研究了各种光谱模型和离散化（角度，时间和空间）的性能。结果表明，将全局光谱模型与网格粗化（与LES网格相比）和最小耦合频率N_（it）结合使用，可以比N_（it）LES迭代更快地计算一个辐射解，同时保持良好的迭代效率。准确性。还似乎与光谱模型的影响相比，对DOM中角度离散化的准确性的影响很小。所确定的最佳方法可以用于执行带有辐射的湍流燃烧的非稳态耦合计算。

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