Unstructured Large Eddy Simulation for Prediction of Noise Issued from Turbulent Jets in Various Configurations
Unstructured Large Eddy Simulation for Prediction of Noise Issued from Turbulent Jets in Various Configurations
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DOI：
10.2514/6.2011-2886
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
Y. Khalighi;J. Nichols;S. Lele;P. Moin
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文献类型：
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作者：
Y. Khalighi;J. Nichols;S. Lele;P. Moin
发展了一种新的非结构可压缩大涡模拟（LES）的数值格式。该方法具有低功耗且对计算网格的质量不太敏感，旨在对复杂配置中的湍流进行大规模、高保真度模拟。这项工作的目的是介绍这种方法，提出了一个严格的验证研究，并证明了各种喷气配置的应用程序。通过预测单股流压力匹配热超声速射流的流动和噪声，验证了该方法的有效性。近场流以及使用声学投影方法计算的远场噪声进行了研究，并与NASA格伦的James Bridges博士获得的实验测量结果进行了比较。网格细化的研究和选择声学投影表面的敏感性研究。为了测试该方法在各种喷气噪声配置中的性能，将其应用于在音速条件下的高涵道比双流射流，垂直超音速射流冲击地面，和水平超音速射流冲击成角度的射流爆炸偏转器。
A novel numerical scheme for unstructured compressible large eddy simulation (LES) is developed. This method is low-dissipative and less sensitive to the quality of the computational grid and is targeted for performing large-scale, high-fidelity simulations of turbulent flows in complex configurations. The objective of this work is to introduce this method, present a rigorous validation study, and demonstrate the application to a variety of jet configurations. This technique is validated by predicting the flow and noise emitted from a single-stream pressure-matched hot supersonic jet. Nearfield flow as well as farfield noise computed using an acoustic projection method is studied and compared to experimental measurements obtained by Dr. James Bridges at NASA Glenn. Mesh refinement studies and sensitivity study on selecting the acoustic projection surface are provided. To test the method’s performance in a variety of jet noise configurations, it is applied to a high bypass ratio dual-stream jet at sonic conditions, a vertical supersonic jet impinging on the ground, and a horizontal supersonic jet impinging on an angled jet blast deflector.