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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Affects of spanwise heterogeneity and topographic height on Amplitude and Frequency modulation in channel flow turbulence.
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Affects of spanwise heterogeneity and topographic height on Amplitude and Frequency modulation in channel flow turbulence.

机译：APS -70TH流体动力学APS划分的年会 - 事件 - 在通道流湍流中振幅和频率调制的跨度异质性和地形高度的影响。

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We study the affects of spanwise heterogeneity on amplitude and frequency modulation of small-scale roughness-sublayer structures due to the passage of large-scale structures in the logarithmic region. Recent studies on amplitude and frequency modulation (Mathis et al. 2009: J. Fluid Mech., 628) have prompted the development of a predictive model for near-wall dynamics. Such a model is of great interest to large-eddy simulation (LES), since near-wall processes are, by definition, never resolved. Here, we have used LES to model flows over a series of spanwise-heterogeneous topographies, where a domain with very long streamwise extent is used to ensure that very-large-scale motions are (or, can be) resolved. We report that the secondary flows globally disrupt the turbulence from channel physics, wherein the ``outer peak'' is either shifted to different wavelengths or nonexistent. This spectral density redistribution is assured to alter amplitude and frequency modulation rates within the roughness sublayer, and we present correlations of the small and large scales to demonstrate precisely that (following the wavelet decomposition, as outlined by Baars et al., 2015: Exp. Fluids). Thus, spanwise heterogeneity should be regarded as a model parameter in any rough-wall-generalized prognostic wall models.
机译：由于对数区域中的大规模结构的通过，研究了SANDIVES异质性对小型粗糙度 - 子层结构的幅度和频率调制的影响。最近关于振幅和频率调制的研究（Mathis等，2009：J. Fluid Mech。，628）促使开发近墙体动力学的预测模型。这种模型对大涡模拟（LES）具有很大的兴趣，因为近壁过程根据定义，从未解决过。在这里，我们使用LES到模型流过一系列跨越异构地形表，其中使用具有很长时间的域的域用于确保（或者可以）解决的非常大的运动。我们报告的是，次要流动全局扰乱信道物理学的湍流，其中“外峰”'要么向不同的波长转移到不同的波长或不存在。该光谱密度再分配被确保改变粗糙度子层内的幅度和频率调制速率，并且我们呈现小型和大尺度的相关性，以确切地证明（在小波分解之后，如Baars等，2015：Exp。液体）。因此，应该将翼展异质性视为任何粗糙壁通用的预后壁模型中的模型参数。

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