Simulations of co-axial jet flows on graphics processing units: the flow and noise analysis
Simulations of co-axial jet flows on graphics processing units: the flow and noise analysis
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图形处理单元上的同轴射流模拟：流动和噪声分析
DOI：
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
S. Karabasov
中科院分区：
文献类型：
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作者：
A. Markesteijn;S. Karabasov
大涡模拟（LES）进行了一系列的完全扩展的同轴射流的情况下，对应的条件下计算的同轴射流噪声（CoJeN）实验QinetiQ。在所有的模拟中，高分辨率的紧凑精确边界调整高REsolution技术（CABARET）用于解决非结构网格上的Navier-Stokes方程。基于可穿透积分曲面的Ffowcs Williams-Hawkings方法被应用于远场噪声预测。为了正确模拟复杂喷嘴下游的湍流，包括一个中心体，壁面模拟LES方法与湍流流入条件的基础上合成湍流一起实施。所有的模型都运行在图形处理单元，使一个相当大的减少流动的解决方案的时间相比，传统的LES。流量和噪声的解决方案进行了验证，对实验数据与1-2分贝的精度被报告的噪声频谱预测的细网格。为了分析射流有效噪声源的结构，计算了湍流脉动雷诺应力的协方差，并在广义声学类比射流噪声模型的背景下分析了它们的特征尺度。单流轴对称射流的自相似性的激励下，一个合适的无量纲化的有效的喷流噪声源的CoJeN喷流进行了测试，并讨论了其对低阶喷流噪声模型的影响。这篇文章是“航空声学研究前沿：理论，计算和实验”主题的一部分。
Large-eddy simulations (LES) are performed for a range of perfectly expanded co-axial jet cases corresponding to conditions of the computation of coaxial jet noise (CoJeN) experiment by QinetiQ. In all simulations, the high-resolution Compact Accurately Boundary-Adjusting high-REsolution Technique (CABARET) is used for solving the Navier–Stokes equations on unstructured meshes. The Ffowcs Williams–Hawkings method based on the penetrable integral surfaces is applied for far-field noise predictions. To correctly model the turbulent flow downstream of the complex nozzle that includes a central body, a wall modelled LES approach is implemented together with a turbulent inflow condition based on synthetic turbulence. All models are run on graphics processing units to enable a considerable reduction of the flow solution time in comparison with the conventional LES. The flow and noise solutions are validated against the experimental data available with 1–2 dB accuracy being reported for noise spectra predictions on the fine grid. To analyse the structure of effective noise sources of the jets, the covariance of turbulent fluctuating Reynolds stresses is computed and their characteristic scales are analysed in the context of the generalized acoustic analogy jet noise models. Motivated by self-similarity of single-stream axi-symmetric jet flows, a suitable non-dimensionalization of the effective jet noise sources of the CoJeN jets is tested, and its implications for low-order jet noise models are discussed. This article is part of the theme issue ‘Frontiers of aeroacoustics research: theory, computation and experiment’.
V 形喷嘴和圆形喷嘴的声源和远场噪声
影响因子：
2.5
作者：
Depuru Mohan N
通讯作者：
Depuru Mohan N
使用戈德斯坦声学类比研究初始层流亚音速射流的声音产生机制
影响因子：
3.7
作者：
Karabasov S
通讯作者：
Karabasov S