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首页> 外文期刊>Applied Acoustics >Prediction of sound absorption by a circular orifice termination in a turbulent pipe flow using the Lattice-Boltzmann method
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Prediction of sound absorption by a circular orifice termination in a turbulent pipe flow using the Lattice-Boltzmann method

机译：使用Lattice-Boltzmann方法预测湍流管道中圆形孔口终端的吸声

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摘要

The Lattice Boltzmann method was used to perform numerical simulations of the sound and turbulent flow inside a standing wave tube terminated by a circular orifice in presence of a forced mean flow. The computational domain comprised a standard virtual impedance tube apparatus in which sound waves were produced by periodic pressure oscillations imposed at one end. An orifice plate was located between the driver and the tube termination. All waves transmitted through the orifice were effectively dissipated by a passively non-reflecting (i.e. anechoic) boundary at the tube termination. A turbulent jet was formed at the discharge of the orifice by the forced mean flow inside the tube. The acoustic impedance and sound absorption coefficient of the orifice plate were calculated from a wave decomposition of the sound field upstream of the orifice. Simulations were carried out for different excitation frequencies, and orifice Mach numbers. Results and trends were in good quantitative agreement with available analytical solutions and experimental data. The Lattice Boltzmann method was found to be an efficient numerical scheme for prediction of sound absorption by realistic three dimensional orifice configurations.
机译：使用格子Boltzmann方法对驻波管内的声音和湍流进行数值模拟，该驻波管在存在强制平均流的情况下以圆形孔口终止。计算域包括一个标准的虚拟阻抗管设备，其中通过施加在一端的周期性压力振荡产生声波。孔板位于驱动器和管接头之间。穿过孔口的所有波都被管子末端处的被动非反射（即无回声）边界有效地消散了。管内的强制平均流量在孔口的出口处形成湍流射流。孔板的声阻抗和吸声系数是根据孔上游的声波的波分解来计算的。针对不同的激励频率和孔口马赫数进行了仿真。结果和趋势与可用的分析解决方案和实验数据具有良好的定量一致性。发现格子Boltzmann方法是一种有效的数值方案，用于通过现实的三维孔结构预测吸声。

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