Enrichment methods for inflow turbulence generation in the atmospheric boundary layer
Enrichment methods for inflow turbulence generation in the atmospheric boundary layer
复制标题
大气边界层流入湍流生成的富集方法
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
S. Lele
中科院分区：
文献类型：
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作者：
E. Quon;A. Ghate;S. Lele
研究了在风电场运行环境的有限域大涡模拟（LES）中引入合成湍流的可行性。这项工作的动机是需要一个强大的中尺度到微尺度耦合策略，其中微尺度（风力发电厂）模拟是由中尺度数据驱动的，没有任何可解决的微尺度湍流。在网格间距为10 m的LES中模拟了中性分层的大气边界层。我们展示了这样一个完全发展的湍流场是如何从一个低分辨率的粗LES场（20米和40米网格间距）开始，通过谱富集来重现的。通过叠加两个湍流模拟器TurbSim和Gabor Kinematic Simulation计算的波动速度场，丰富了欠分辨场的速度谱。两种富集形式都准确地模拟了高波数下所有三种速度分量的自谱，富集场与距入流边界400 m处观测到的全分辨率LES相一致。相比之下，未富集场的光谱在4倍的下游距离处达到相同的完全发育状态。
We investigate the feasibility of introducing synthetic turbulence into finite-domain large-eddy simulations (LES) of the wind plant operating environment. This effort is motivated by the need for a robust mesoscale-to-microscale coupling strategy in which a microscale (wind plant) simulation is driven by mesoscale data without any resolved microscale turbulence. A neutrally stratified atmospheric boundary layer was simulated in an LES with 10-m grid spacing. We show how such a fully developed turbulence field may be reproduced with spectral enrichment starting from an under-resolved coarse LES field (with 20-m and 40-m grid spacing). The velocity spectra of the under-resolved fields are enriched by superimposing a fluctuating velocity field calculated by two turbulence simulators: TurbSim and Gabor Kinematic Simulation. Both forms of enrichment accurately simulated the autospectra of all three velocity components at high wavenumbers, with agreement between the enriched fields and the full-resolution LES observed at 400 m from the inflow boundary. In contrast, the spectra of the unenriched fields reached the same fully developed state at four times the downstream distance.