On the Application of the Dynamic Smagorinsky Model to Large-Eddy Simulations of the Cloud-Topped Atmospheric Boundary Layer
On the Application of the Dynamic Smagorinsky Model to Large-Eddy Simulations of the Cloud-Topped Atmospheric Boundary Layer
复制标题
动态Smagorinsky模型在云顶大气边界层大涡模拟中的应用
DOI：
10.1175/jas3651.1
复制
发表时间：
2006
影响因子：
3.1
通讯作者：
N. Mansour
中科院分区：
文献类型：
--
作者：
M. Kirkpatrick;A. Ackerman;D. Stevens;N. Mansour
摘要本文采用Smagorinsky模型，采用非弹性形式的控制方程，将原先为工程流动而发展的动态Smagorinsky模型应用于云顶大气边界层的模拟。该模型考虑了局部浮力源、垂直密度分层和近地表分辨率差等因素，并计算了潜在温度和总水混合比亚网格尺度通量的附加模型系数。对第二次海洋层积云动力学与化学（DYCOMS-II）野外试验第一次研究飞行中观测到的夜间海洋层积云云甲板进行了动态模型与两种非动态模型的模拟结果进行了比较。发现动态Smagorinsky模型对所有参数和统计量的观测值具有较好的一致性。与非动态模型相比，动态模型具有更好的空间收敛性和分辨率独立性。
Abstract In this paper the dynamic Smagorinsky model originally developed for engineering flows is adapted for simulations of the cloud-topped atmospheric boundary layer in which an anelastic form of the governing equations is used. The adapted model accounts for local buoyancy sources, vertical density stratification, and poor resolution close to the surface and calculates additional model coefficients for the subgrid-scale fluxes of potential temperature and total water mixing ratio. Results obtained with the dynamic model are compared with those obtained using two nondynamic models for simulations of a nocturnal marine stratocumulus cloud deck observed during the first research flight of the second Dynamics and Chemistry of Marine Stratocumulus (DYCOMS-II) field experiment. The dynamic Smagorinsky model is found to give better agreement with the observations for all parameters and statistics. The dynamic model also gives improved spatial convergence and resolution independence over the nondynamic model...