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首页> 外文期刊>International Journal of Heat and Fluid Flow >Eigensensitivity analysis of subgrid-scale stresses in large-eddy simulation of a turbulent axisymmetric jet
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Eigensensitivity analysis of subgrid-scale stresses in large-eddy simulation of a turbulent axisymmetric jet

机译：湍流轴对称射流大涡模拟中亚网格尺度应力的本征敏感性分析

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摘要

The study of complex turbulent flows by means of large-eddy simulation approaches has become increasingly popular in many scientific and engineering applications. The underlying filtering operation of the approach enables to significantly reduce the spatial and temporal resolution requirements by means of representing only large-scale motions. However, the small-scale stresses and their effects on the resolved flow field are not negligible, and therefore require additional modeling. As a consequence, the assumptions made in the closure formulations become potential sources of model-form uncertainty that can impact the quantities of interest. The objective of this work, thus, is to perform a model-form sensitivity analysis in large-eddy simulations of an axisymmetric turbulent jet following an eigenspace-based strategy recently proposed. The approach relies on introducing perturbations to the decomposed subgrid-scale stress tensor within a range of physically plausible values. These correspond to discrepancy in magnitude (trace), anisotropy (eigenvalues) and orientation (eigenvectors) of the normalized, small-scale stresses with respect to a given tensor state, such that propagation of their effects can be assessed. The generality of the framework with respect to the six degrees of freedom of the small-scale stress tensor makes it also suitable for its application within data-driven techniques for improved subgrid-scale modeling.
机译：通过大涡模拟方法研究复杂湍流已在许多科学和工程应用中变得越来越流行。该方法的基础滤波操作能够通过仅表示大规模运动来显着降低空间和时间分辨率要求。但是，小尺度应力及其对解析流场的影响不可忽略，因此需要附加建模。结果，在封闭公式中做出的假设成为可能影响目标数量的模型形式不确定性的潜在来源。因此，这项工作的目的是按照最近提出的基于本征空间的策略，在轴对称湍流射流的大涡模拟中进行模型形式的灵敏度分析。该方法依赖于在合理的物理值范围内对分解后的亚网格规模应力张量引入扰动。这些对应于相对于给定张量状态的归一化小规模应力的大小（迹线），各向异性（特征值）和方向（特征向量）差异，因此可以评估其影响的传播。框架相对于小规模应力张量的六个自由度的通用性使其也适合于在数据驱动技术中用于改进亚网格规模建模的应用。

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