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Assessment of WALE and Sigma(σ) Sub-Grid Scale Models for Jet Noise Prediction

机译：WALE和Sigma（σ）子网格比例模型对射流噪声预测的评估

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摘要

Jet turbulence is one of the key noise generating sources in a jet engine exhaust. This paper explores Large Eddy Simulation (LES) with different Sub-Grid Scale (SGS) models for more realistic nozzle flows. These models are also tested for their robustness by using coarser meshes moderately resolved in the near-wall regions. The impact of using improved models is apparent for co-axial nozzle velocity and normal stress profiles especially near the jet exit. The radiated Sound Pressure Level (SPL) in the far-field domain are also affected by this. These SGS models can be very effective especially when considering more realistic geometries with wall surfaces such as the pylon and the wing that will interact with the flow.
机译：喷气湍流是喷气发动机排气中主要的噪声产生源之一。本文探索了具有不同子网格比例（SGS）模型的大型涡模拟（LES），以实现更逼真的喷嘴流量。通过使用在近壁区域中度分辨的较粗网格，还测试了这些模型的鲁棒性。对于同轴喷嘴速度和法向应力分布，尤其是在射流出口附近，使用改进模型的影响显而易见。远场域中的辐射声压级（SPL）也受此影响。这些SGS模型非常有效，尤其是当考虑具有壁面的更实际几何形状时，例如与流动相互作用的塔架和机翼。

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