Coherent Eddies Transporting Passive Scalars Through the Plant Canopy Revealed by Large-Eddy Simulations Using the Lattice Boltzmann Method
Coherent Eddies Transporting Passive Scalars Through the Plant Canopy Revealed by Large-Eddy Simulations Using the Lattice Boltzmann Method
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使用格子玻尔兹曼方法进行大涡模拟揭示了相干涡流通过植物冠层传输被动标量
DOI：
10.1007/s10546-021-00633-1
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发表时间：
2021
影响因子：
4.3
通讯作者：
Inagaki Atsushi
中科院分区：
文献类型：
--
作者：
Watanabe Tsutomu;Takagi Marie;Shimoyama Kou;Kawashima Masayuki;Onodera Naoyuki;Inagaki Atsushi
本文描述了一种用于中性分层湍流中被动标量场大涡模拟的双分布函数格子Boltzmann模型。在模拟均匀植物冠层内和上方的标量湍流时，发现该模式的性能与基于Navier-Stokes方程和标量对流扩散方程的常规大涡模拟模式的平均湍流统计、二阶矩预算、功率谱和空间两点相关函数相当。对于一个自上而下的标量，其中植物冠层作为一个分布式的汇，冠层顶部附近的标量的方差和通量主要是由冠层以上的扫描运动起源。这些扫掠运动，其空间尺度远大于冠层高度，深入冠层内部，并导致冠层底部附近的标量扫掠事件。相比之下，冠层底部附近的标量喷射事件是由冠层顶部附近产生的相干涡引起的。这种涡旋的产生是由大量的扫掠运动向下接近现有的从内部到上方的冠层的弱喷射运动的广泛区域所触发的。标量从冠层上方到冠层底部的非局部输送，反之亦然，是由这些不同起源的涡旋驱动的。这种非本地的运输有显着的影响标量方差和通量预算内和上方的冠层，以及运输标量从底层土壤排放到大气中。
A double-distribution-function lattice Boltzmann model for large-eddy simulations of a passive scalar field in a neutrally stratified turbulent flow is described. In simulations of the scalar turbulence within and above a homogeneous plant canopy, the model’s performance is found to be comparable with that of a conventional large-eddy simulation model based on the Navier–Stokes equations and a scalar advection–diffusion equation in terms of the mean turbulence statistics, budgets of the second moments, power spectra, and spatial two-point correlation functions. For a top-down scalar, for which the plant canopy serves as a distributed sink, the variance and flux of the scalar near the canopy top are predominantly determined by sweep motions originating far above the canopy. These sweep motions, which have spatial scales much larger than the canopy height, penetrate deep inside the canopy and cause scalar sweep events near the canopy floor. By contrast, scalar ejection events near the canopy floor are induced by coherent eddies generated near the canopy top. The generation of such eddies is triggered by the downward approach of massive sweep motions to existing wide regions of weak ejective motions from inside to above the canopy. The non-local transport of scalars from above the canopy to the canopy floor, and vice versa, is driven by these eddies of different origins. Such non-local transport has significant implications for the scalar variance and flux budgets within and above the canopy, as well as the transport of scalars emitted from the underlying soils to the atmosphere.
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DOI：
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发表时间：
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期刊：
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影响因子：
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