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Wall-resolved large eddy simulation for aeroengine aeroacoustic investigation

机译:用于航空发动机航空声学研究的壁解析大涡模拟

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The work presented here forms part of a larger project on Large-Eddy Simulation (LES) of aeroengine aeroacoustic interactions. In this paper, we concentrate on LES of near-field flow over an isolated NACA0012 aerofoil at zero angle-of-attack and a chord based Reynolds number of Rec = 2 × 105. A wall-resolved compressible Numerical Large Eddy Simulation (NLES) approach is employed to resolve streak-like structures in the near-wall flow regions. The calculated unsteady pressure/velocity field will be imported into an analyticallybased scheme for far-field trailing-edge noise prediction later. The boundary-layer mean and root-mean-square (rms) velocity profiles, the surface pressure fluctuation over the aerofoil, and the wake flow development are compared with experimental data and previous computational simulations in our research group. It is found that the results from the wall-resolved compressible NLES are very encouraging as they correlate well with test data. The main features of the wall-resolved compressible NLES, as well as the advantages of such compressible NLES over previous incompressible LES performed in our research group, are also discussed.This paper will be presented at the ISABE 2017 Conference, 5-8 September 2017, Manchester, UK.
机译:此处介绍的工作是航空发动机气动声学相互作用的大涡模拟(LES)大型项目的一部分。在本文中,我们专注于零迎角和基于弦的雷诺数Rec = 2×105的孤立NACA0012机翼上的近场流LES。壁解析可压缩数值大涡模拟(NLES)该方法用于解决近壁流动区域中的条纹状结构。计算出的非稳态压力/速度场将被导入到基于解析的方案中,以用于稍后的远场后缘噪声预测。将边界层平均速度和均方根(rms)速度曲线,机翼上的表面压力波动以及尾流发展与我们的研究组中的实验数据和先前的计算模拟进行了比较。发现壁分解可压缩NLES的结果非常令人鼓舞,因为它们与测试数据很好地相关。还讨论了壁解析可压缩NLES的主要特征以及这种可压缩NLES优于我们在研究小组中执行的先前不可压缩LES的优势。本文将在2017年9月5日至8日举行的ISABE 2017大会上发表,英国曼彻斯特。

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