A wavenumber-frequency spectral model for atmospheric boundary layers

A wavenumber-frequency spectral model for atmospheric boundary layers
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大气边界层的波数-频谱模型

DOI:
10.1088/1742-6596/524/1/012104
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发表时间:
2014
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
C. Meneveau
C. Meneveau
中科院分区:
--
文献类型:
--
作者:
M. Wilczek;R.J.A.M. Stevens;Y. Narita;C. Meneveau

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由于需要表征风力发电场的功率波动,我们根据气流速度波动的联合波数-频率频谱研究了中性大气边界层的时空相关性。为此,我们通过平均流和大尺度速度波动对小尺度速度波动的简单平流模型进行了理论分析。该模型与大涡模拟(LES)的数据进行了比较。我们发现该模型捕获了在LES中观察到的趋势,特别是由于平均流量引起的频率的多普勒频移以及由于随机扫频效应引起的多普勒展宽。
Motivated by the need to characterize power fluctuations in wind farms, we study spatio-temporal correlations of a neutral atmospheric boundary layer in terms of the joint wavenumber-frequency spectrum of the streamwise velocity fluctuations. To this end, we perform a theoretical analysis of a simple advection model featuring the advection of small-scale velocity fluctuations by the mean flow and large-scale velocity fluctuations. The model is compared to data from large-eddy simulations (LES). We find that the model captures the trends observed in LES, specifically a Doppler shift of frequencies due to the mean flow as well as a Doppler broadening due to random sweeping effects.
DOI: 10.1002/zamm.19250050212
发表时间: 1925-01-01
期刊: ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
影响因子: --
作者:
Prandtl, L
通讯作者: Prandtl, L