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Numerical Method for Modeling of Acoustic Waves Propagation

机译：声波传播建模的数值方法

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摘要

In this paper, numerical results of modeling of acoustic waves propagation are presented. For calculation of the acoustic fluctuations, a solution of the full non-linear Euler equation is used. The Euler equations are solved with the use of a numerical scheme of third-order accuracy in space and time. The paper shows a validation process of the described method. This method is suitable also for an aerodynamic noise assessment on the basis of unsteady mean flow field data obtained from a CFD calculations. In such case this method is called a hybrid CFD/CAA method. The proposed method is numerically decoupled with CFD solution, therefore the information about the mean unsteady flow field can be obtained using an arbitrary CFD method (solver). The accuracy of the acoustic field assessment depends on the quality of the CFD solutions. This decomposition reduces considerably the computational cost in comparison with direct noise calculations.rnThe presented Euler acoustic postprocessor (EAP) has been used for modeling of the acoustic waves propagation in a cavity and in the flow field around a cylinder and an aerodynamic profile.
机译：本文给出了声波传播建模的数值结果。为了计算声起伏，使用了完整的非线性欧拉方程的解。欧拉方程是使用时空三阶精度的数值方案求解的。本文显示了所描述方法的验证过程。该方法也适用于基于从CFD计算获得的非稳态平均流场数据的空气动力学噪声评估。在这种情况下，此方法称为混合CFD / CAA方法。所提出的方法在数值上与CFD解耦，因此可以使用任意CFD方法（求解器）获得有关平均非恒定流场的信息。声场评估的准确性取决于CFD解决方案的质量。与直接噪声计算相比，这种分解大大降低了计算成本。提出的Euler声学后处理器（EAP）已用于对在腔体中以及在圆柱体周围的流场中传播的声波以及空气动力学轮廓进行建模。

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  • 来源
    《Archives of acoustics》 |2010年第1期|p.35-48|共14页
  • 作者

    Slawomir DYKAS; Wlodzimierz WROBLEWSKI; Sebastian RULIK; Tadeusz CHMIELNIAK;

  • 作者单位

    Silesian University of Technology Institute of Power Engineering and Turbomachinery Konarskiego 18, 44-100 Gliwice, Poland;

    Silesian University of Technology Institute of Power Engineering and Turbomachinery Konarskiego 18, 44-100 Gliwice, Poland;

    Silesian University of Technology Institute of Power Engineering and Turbomachinery Konarskiego 18, 44-100 Gliwice, Poland;

    Silesian University of Technology Institute of Power Engineering and Turbomachinery Konarskiego 18, 44-100 Gliwice, Poland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    acoustic wave; fluctuation; aerodynamic noise; euler equations;

    机译：声波波动;空气动力噪声;欧拉方程;

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