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Investigation of the Aerodynamic Noise Radiation by Subsonic Jets at High Reynolds

机译：高雷诺亚音速喷射对空气动力噪声辐射的研究

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摘要

Aerodynamic noise radiation mechanisms were investigatedrnby implicit large-eddy simulation (LES) of twodimensional,rnaxisymmetric jets at high Reynolds number.rnFor the unsteady flow-noise computations, a nonconservativerncharacteristic-based formulation was used tornsolve the compressible Navier-Stokes equations. The directrnassessment of sound radiation provided by an implicitrnLES method based on the approximate deconvolution modelrn(ADM) allows to compute the jet noise radiation at highrnReynolds number, without subgrid modeling assumptionsrncommonly required by acoustic analogy based methods. Inrnorder to provide highly accurate computations of the nonlinearrnmechanisms of jet noise generation, the numericalrnalgorithm employed in this work was based on high-orderrncompact finite difference schemes for spatial discretizationrnand a standard fourth-order Runge-Kutta method for timernintegration. Numerical instabilities arising from the highfrequencyrncontent of the smallest unresolved subgrid scalesrnwere removed by the application of high-order compact filters.rnImplicit LES of Mach 0:9 cold jets at Reynolds numberrn6:5 u0002 104 were carried out in order to analyze the impactrnof jet inflow conditions, particularly the effect of therngrid resolution on the jet flow dynamics. Mach number effectsrnon sound propagation were evaluated, as for example,rnthe highly directional pattern of noise radiation. The resultsrnobtained by implicit LES were compared with available experimentalrnand numerical results at similar flow conditionsrntaken from the literature.
机译：通过高雷诺数二维绕射对称对称射流的隐式大涡模拟（LES）研究了气动噪声的辐射机理。对于非稳态流噪声计算，采用了非保守的基于特性的公式来求解可压缩的Navier-Stokes方程。通过基于近似解卷积模型（ADM）的隐式LES方法提供的声音辐射的直接评估，可以计算出高雷诺数下的射流噪声辐射，而无需基于声学类比的方法通常需要的子网格建模假设。为了提供喷射噪声产生非线性机制的高精度计算，本文采用的数值算法基于空间离散的高阶紧致有限差分方案和用于时间积分的标准四阶Runge-Kutta方法。应用高阶紧凑型过滤器消除了最小未解决子网格规模的高频含量引起的数值不稳定性。为了分析冲击力射流的流入，对雷诺数为6：5 u0002 104的0：9马赫冷射流进行了隐式LES。条件，特别是热分辨率对射流动力学的影响。对马赫数效应和非声传播进行了评估，例如，噪声辐射的高度定向模式。将隐式LES得到的结果与现有文献中相似流动条件下的实验结果和数值结果进行了比较。

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