Development of local-scale high-resolution atmospheric dispersion model using large-eddy simulation. Part 3: turbulent flow and plume dispersion in building arrays
Development of local-scale high-resolution atmospheric dispersion model using large-eddy simulation. Part 3: turbulent flow and plume dispersion in building arrays
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DOI：
10.1080/00223131.2013.785267
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发表时间：
2013-05-01
影响因子：
1.2
通讯作者：
Nagai, Haruyasu
中科院分区：
文献类型：
--
作者：
Nakayama, Hiromasa;Jurcakova, Klara;Nagai, Haruyasu
我们开发了一个使用大涡模拟的局部尺度高分辨率大气扩散模式（LOHDIM-LES），用于评估核设施的安全性，并应对意外或故意释放放射性物质的紧急情况（例如，在城市地区的恐怖袭击）。在第一部分中，成功地模拟了平坦地形上羽流的非定常行为。在第二部分中，提出了一种产生空间发展湍流边界层流动的新方案。然后，验证了大涡模拟（LES）模型的湍流和羽流扩散的孤立的建筑物。在这项研究中，我们扩展了LES模型的湍流和羽流分散在各种建筑阵列，代表典型的城市表面的几何形状。针对建筑物阵列中的流场和弥散特性，研究了与障碍物密度相关的流场分布规律以及障碍物阵列中的平均和均方根（r.m.s.）浓度与风洞实验结果吻合良好。结果表明，LES模型成功地模拟了城市型地面几何条件下的湍流和羽流扩散的非定常行为。
We have developed a LOcal-scale High-resolution atmospheric DIspersion Model using Large-Eddy Simulation (LOHDIM-LES) to assess the safety at nuclear facilities and to respond to emergencies against accidental or intentional release of radioactive materials (e.g., a terrorist attack in an urban area). In Part 1, the unsteady behavior of a plume over a flat terrain was successfully simulated. In Part 2, a new scheme to generate a spatially developing turbulent boundary layer flow was proposed. Then, the large-eddy simulation (LES) model for turbulent flow and plume dispersion around an isolated building was validated. In this study, we extend the LES model to turbulent flows and plume dispersion in various building arrays that represent typical urban surface geometries. Concerning the characteristics of flow and dispersion in building arrays, the flow patterns associated with obstacle densities and the distribution patterns of mean and root-mean-square (r.m.s.) concentrations agree well with those of the wind tunnel experiments. It is shown that the LES model successfully simulates the unsteady behaviors of turbulent flows and plume dispersion in urban-type surface geometries.