Simulation of Turbulent Flow over Complex Terrain

这项工作的目标是提高使用大涡模拟(LES)模拟复杂地形上的气流的能力。这种方法是将最近在工程流程建模方面取得的一些进展应用于气象学。具体地说，目标是(1)开发和测试用于描述大涡模拟尚未解决的运动尺度的表面边界条件和模型的几种近似；以及(2)通过将新模型应用于几个实地研究的数据来研究大气流动的物理。该方法采用高度并行计算，在水平方向上达到约10m的网格分辨率，在垂直方向上达到100级的分辨率。要调查的复杂情况的例子包括深谷内的逆温层、陡峭的地形和谷风。

The goal of this work is to improve the ability to simulate airflow over complex terrain using large-eddy simulation (LES). The approach is to apply to meteorology some of the recent advances that have been made in the modeling of engineering flows. Specifically, the objectives are (1) to develop and test several approximations for surface boundary conditions and models for characterizing the scales of motion that are unresolved by LES; and (2) to investigate the physics of atmospheric flows by applying the new models to data from several field studies. The approach employs highly parallel computing to achieve a grid resolution of about 10 m in the horizontal and 100 levels in the vertical. Examples of the kinds of complex situations to be investigated include inversion layers within a deep valley, steep orography, and valley winds.