论文标题
大型涡流模拟中近表面湍流的动态建模
Dynamic modelling of near-surface turbulence in large eddy simulation of wind farms
论文作者
论文摘要
在大气边界层流向风电场的大型涡流模拟中，通常为表面通量施加壁层模型，而无需考虑表面粗糙度的空间变化。在这项研究中，我们将近表面模型与速度梯度张量的平方结合使用，以模拟湍流产生的自适应耗散。表面粗糙度通过Monin-Obhukhov的相似性理论纳入了与地球表面相邻的计算细胞。拟议的近地表模型捕获了近地面中的大量雷诺应力，并能够维持风电场中的日志范围。本研究表明，与经典的“近壁模型”相比，建议的“近表面模型”相对健壮。
In large eddy simulation of atmospheric boundary layer flows over wind farms, wall-layer models are generally imposed for the surface fluxes without considering the spatial variability of the surface roughness. In this study, we consider the near-surface model in conjunction with square of the velocity gradient tensor to model the adaptive dissipation of turbulence production. The surface roughness is incorporated through Monin-Obhukhov similarity theory for the computational cells immediately adjacent to the Earth's surface. The underlying proposed near-surface model captures the significant amount of Reynolds stresses in the near-surface and is able to maintain the log-law profile in wind farms. The present study indicates that the suggested `near-surface model' is relatively robust in comparison to the classical `near-wall model'.
