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首页> 外文期刊>American journal of applied sciences >Aerodynamic Noise Prediction Using stochastic Turbulence Modeling | Science Publications
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Aerodynamic Noise Prediction Using stochastic Turbulence Modeling | Science Publications

机译：随机湍流建模的气动噪声预测科学出版物

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> Amongst many approaches to determine the sound propagated from turbulent flows, hybrid methods, in which the turbulent noise source field is computed or modeled separately from the far field calculation, are frequently used. For basic estimation of sound propagation, less computationally intensive methods can be developed using stochastic models of the turbulent fluctuations (turbulent noise source field). A simple and easy to use stochastic model for generating turbulent velocity fluctuations called continuous filter white noise (CFWN) model was used. This method based on the use of classical Langevian-equation to model the details of fluctuating field superimposed on averaged computed quantities. The resulting sound field due to the generated unsteady flow field was evaluated using Lighthill's acoustic analogy. Volume integral method used for evaluating the acoustic analogy. This formulation presents an advantage, as it confers the possibility to determine separately the contribution of the different integral terms and also integration regions to the radiated acoustic pressure. Our results validated by comparing the directivity and the overall sound pressure level (OSPL) magnitudes with the available experimental results. Numerical results showed reasonable agreement with the experiments, both in maximum directivity and magnitude of the OSPL. This method presents a very suitable tool for the noise calculation of different engineering problems in early stages of the design process where rough estimates using cheaper methods are needed for different geometries.
机译： >在许多确定从湍流传播的声音的方法中，经常使用混合方法，在该方法中，湍流噪声源场是与远场计算分开计算或建模的。对于声音传播的基本估计，可以使用湍流涨落（湍流噪声源场）的随机模型开发较少计算量的方法。使用了一种简单易用的随机模型来生成湍流速度波动，该模型称为连续滤波器白噪声（CFWN）模型。该方法基于使用经典Langevian方程来对叠加在平均计算量上的波动场的细节进行建模。使用Lighthill的声学类比评估了由于产生的非恒定流场而产生的声场。体积积分法，用于评估声学比喻。该公式表示一个优点，因为它赋予了分别确定不同积分项以及积分区域对辐射声压的贡献的可能性。我们的结果通过将方向性和总体声压级（OSPL）大小与可用的实验结果进行比较得到了验证。数值结果表明，在最大指向性和OSPL量级上，实验均与实验合理吻合。此方法为设计过程的早期阶段中不同工程问题的噪声计算提供了一种非常合适的工具，其中对于不同的几何形状，需要使用较便宜的方法进行粗略估计。

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