An iterative algorithm for computing aeroacoustic integrals with application to the analysis of free shear flow noise.
An iterative algorithm for computing aeroacoustic integrals with application to the analysis of free shear flow noise.
复制标题
一种计算气动声学积分的迭代算法，应用于自由剪切流噪声分析。
DOI：
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发表时间：
2010
影响因子：
2.4
通讯作者：
V. Fortuné
中科院分区：
文献类型：
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作者：
F. Margnat;V. Fortuné
提出了一种计算气动声学积分的时间域迭代算法。它是专门为声学图像的生成而设计的，因此当考虑大尺寸源场时，它可以访问非定常流辐射的波前图案。它是基于在给定时间步长的辐射过程中涉及的源-观测者对的迭代选择。它是作为高级方法编写的，允许与流动模拟工具轻松连接。它的效率与声波在一个时间步内覆盖的观测者网格步长的分数有关。测试计算表明，与经典的非迭代程序相比，CPU时间缩短了30到50倍。该算法被应用于计算空间演变的混合层流动所辐射的声场：它被用于计算和可视化通过Lighthill源项的分解获得的不同项对声场的贡献。
An iterative algorithm is developed for the computation of aeroacoustic integrals in the time domain. It is specially designed for the generation of acoustic images, thus giving access to the wavefront pattern radiated by an unsteady flow when large size source fields are considered. It is based on an iterative selection of source-observer pairs involved in the radiation process at a given time-step. It is written as an advanced-time approach, allowing easy connection with flow simulation tools. Its efficiency is related to the fraction of an observer grid step that a sound-wave covers during one time step. Test computations were performed, showing the CPU-time to be 30 to 50 times smaller than with a classical non-iterative procedure. The algorithm is applied to compute the sound radiated by a spatially evolving mixing-layer flow: it is used to compute and visualize contributions to the acoustic field from the different terms obtained by a decomposition of the Lighthill source term.