Numerical Study of Chevron Jet Noise Using Parallel Flow Solver

Numerical Study of Chevron Jet Noise Using Parallel Flow Solver
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使用并行流求解器对 Chevron 喷射噪声进行数值研究

DOI:
10.1016/j.proeng.2013.07.090
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发表时间:
2013
期刊:
Procedia Engineering
影响因子:
--
通讯作者:
Xia H
Xia H
中科院分区:
--
文献类型:
--
作者:
Xia H

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V 形喷嘴射流的混合大涡型模拟以马赫 0.9 和 Re ∼ 106 进行。采用隐式或数值大涡模拟(ILES 或 NLES),即省略显式亚网格尺度模型。将雷诺平均纳维-斯托克斯 (RANS) 解混合到近壁区域。这形成了整体混合 LES-RANS 方法。应用汉密尔顿-雅可比方程来消除杂化所暗示的不同的湍流长度尺度。对基线圆形喷嘴和高度弯曲的人字形喷嘴进行了计算对比。通过比较使用相同网格分辨率和流动条件的两个喷嘴来研究 V 形效应。通过使用 RANS 模拟,可以探索测量中传入边界层的状态以及任何层化的程度。噪声预测是使用基于近场 LES 数据的可渗透表面 Ffowcs Williams – Hawkings (FWH) 方法进行的。结果与 NASA SHJAR 测量数据进行了比较。还探讨了流求解器的并行方面,包括使用调度改进的数据打包/发送机制。
Hybrid large-eddy type simulations for chevron nozzle jet flows are performed at Mach 0.9 and Re ∼ 106. Implicit or numerical large- eddy simulation (ILES or NLES) is employed, namely omitting explicit subgrid scale models. A Reynolds-averaged Navier-Stokes (RANS) solution is blended into the near wall region. This makes an overall hybrid LES-RANS approach. A Hamilton–Jacobi equation is applied to remove the disparate turbulence length scales implied by hybridization. Computations are contrasted for a baseline round nozzle and a highly bended chevron nozzle. The chevron effects are studied by comparing both nozzles using the same mesh resolution and flow conditions. Through the use of RANS simulations the state of the incoming boundary layer from the measurements is explored and the extent of any laminarization. Noise predictions are made using a permeable surface Ffowcs Williams – Hawkings (FWH) method based on the near field LES data. Results are compared with the NASA SHJAR measurement data. Parallel aspects of the flow solver are also explored including an improved data packaging/sending mechanism using scheduling.
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