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首页> 外文期刊>International Journal of Heat and Fluid Flow >Large eddy simulations of forced heat convection in a pin-fin array with a priori examination of an eddy-viscosity turbulence model
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Large eddy simulations of forced heat convection in a pin-fin array with a priori examination of an eddy-viscosity turbulence model

机译：销鳍阵列中强制热对流的大型涡流模拟，具有涡粘度湍流模型的优先考察

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摘要

Reynolds-averaged Navier-Stokes (RANS) modeling remains the predominant technique for engineering simulations of turbulent flow and heat transfer. Most simulations employ the linear-eddy viscosity assumption to model the Reynolds stresses, which is known to produce inaccurate results in complex turbulent flows. The objective of this study is to provide new insight on the inadequacy of LEV models in complex engineering turbulence by performing an a priori examination of a typical LEV model, the k - omega shear-stress transport (SST) model, for flow predictions in a pin-fin array. First, LES results obtained from simulations with three levels of mesh resolution are presented and validated against published experimental data. Second, an a priori examination of the SST model is performed, considering discrepancies between the shape and orientation of the Reynolds stress tensors obtained from the SST model and the LES. The results illustrate that the LES predicted Reynolds stresses have significantly different characteristics in regions of developing versus fully developed turbulence, and in the bulk-flow versus near-wall regions. These differences are not reflected in the Reynolds stresses predicted by the SST model, which predicts very similar Reynolds stress shapes and orientations in these different flow regimes. The analysis provides some insight on correcting the shape of the Reynolds stress tensor in particular; this information will be used in future work to examine practical methods to quantify turbulence model form uncertainties.
机译：Reynolds平均Navier-Stokes（RANS）建模仍然是湍流和传热的工程模拟的主要技术。大多数仿真采用线性涡流粘度假设来模拟雷诺应力，已知在复杂的湍流流动中产生不准确的结果。本研究的目的是通过执行典型的lev模型，K - Omega剪切应力传输（SST）模型的先验检查，为复杂工程湍流中的释放工程湍流中的缺陷态度不足提供新的洞察力。 PIN鳍数组。首先，提出并验证了从具有三个级别的网格分辨率的模拟获得的LES结果，并​​针对已发表的实验数据验证。其次，执行SST模型的先验检查，考虑到从SST模型和LES获得的雷诺应力张量的形状和定向之间的差异。结果说明了LES预测的雷诺应力在显影与完全发育的湍流的区域中具有显着不同的特征，并且在散装流与靠近壁区域中。这些差异没有反映在SST模型预测的雷诺斯应力中，这预测了这些不同流动制度中非常相似的雷诺应力形状和取向。该分析提供了一些关于校正雷诺应力张量的形状的洞察力;将在将来的工作中使用此信息来检查实际方法，以定量湍流模型形成不确定性。

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