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Direct Noise Computation with a Lattice-Boltzmann Method and Application to Industrial Test Cases

机译:用Lattice-Boltzmann方法直接噪声计算及其在工业测试案例中的应用

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The Direct Noise Computation (DNC) approach is challenging in Computational Aero-Acoustics (CAA) since the computation of the pressure fluctuations requires the resolution of unsteady and compressible flows. Indeed, most numerical methods such as the finite volume and element methods face limitations to efficiently resolve the unsteady compressible Navier-Stokes equations for turbulent flows and the computational costs is extremely high. Instead, steady-state analysis with Reynolds-Averaged Navier-Stokes (RANS) turbulence modeling is generally preferred, however this prevents from a direct computation of the noise as only the mean pressure field is obtained. The use of artificial viscosity is also required to achieve numerical stability, which dampens the high frequency physics.
机译:直接噪声计算(DNC)方法在计算航空声学(CAA)中具有挑战性,因为压力波动的计算需要解决不稳定和可压缩的流动。实际上,大多数数值方法(例如有限体积法和元素法)都面临着限制,无法有效地解决湍流中不稳定的可压缩Navier-Stokes方程,并且计算成本非常高。取而代之的是,通常首选采用雷诺平均纳维-斯托克斯(RANS)湍流模型进行稳态分析,但是由于仅获得平均压力场,因此无法直接计算噪声。还需要使用人工粘度来实现数值稳定性,这会削弱高频物理特性。

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