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arXiv 1203.6350physics.comp-phphysics.flu-dyn
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弱可压缩格子Boltzmann格式的吸收层分析

Analysis of the absorbing layers for the weakly-compressible lattice Boltzmann schemes

Hui Xu, Pierre Sagaut

摘要:

格子Boltzmann格式在计算气动声学中是一种非常有效的方法。为了处理LBS的吸声边界条件问题,提出了三种阻尼项,并将其加入到LBS控制方程的右侧。从经典理论来看,这些项在吸收和减小计算边界的声波反射方面起着重要作用。同时,恢复了含阻尼项的宏观方程,用于分析阻尼项的宏观行为,确定临界吸波强度。此外,为了检测耗散和色散行为,线性化LBS与阻尼项推导和分析。通过冯诺依曼分析,在波数空间的色散和耗散性质进行了探讨。给出了相应的阻尼强度临界值和最佳吸收项。最后,一些基准问题的实施,以评估理论的结果。

英文摘要:

It has been demonstrated that Lattice Boltzmann schemes (LBSs) are very efficient for Computational AeroAcoustics (CAA). In order to handle the issue of absorbing acoustic boundary conditions for LBS, three kinds of damping terms are proposed and added into the right hand sides of the governing equations of LBS. From the classical theory, these terms play an important role to absorb and minimize the acoustic wave reflections from computational boundaries. Meanwhile, the corresponding macroscopic equations with the damping terms are recovered for analyzing the macroscopic behaviors of the these damping terms and determining the critical absorbing strength. Further, in order to detect the dissipation and dispersion behaviors, the linearized LBS with the damping terms is derived and analyzed. The dispersive and dissipative properties are explored in the wave-number spaces via the Von Neumann analysis. The related damping strength critical values and the optimal absorbing term are addressed. Finally, some benchmark problems are implemented to assess the theoretical results.

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