Simulation of Turbulent Flow Over Complex Terrain

为研究复杂地形上的湍流流动，提出了一套定义良好的数值实验。目标是模拟和分析在地形上分散和混合的物理中至关重要的流动特征，并改进中尺度大气模拟（例如，背风波，波浪破碎，流动分离和地形阻力）。在模型（实验室）尺度上对它们进行精确模拟，是提高对大气中这些特征的理解的重要的第一步。在先前的NSF资助下开发的一套模拟工具的拟议扩展包含了精确模拟模式尺度大气流动所必需的元素。研究策略是：开发数值工具，验证和测试工具，并研究几种地形上的湍流。在复杂地形上模拟实验室规模的地球物理流动将以两种方式有助于现场尺度的大气模拟：通过改进中尺度模拟的近似边界条件和参数化，以及通过直接了解流动物理。

Abstract/Street ATM-9526246 A well defined set of numerical experiments is proposed for an investigation of turbulent flow over complex terrain. The objective is the simulation and analysis of flow features crucial in the physics of dispersion and mixing over topography and for the improvement of mesoscale atmospheric simulation, (e.g., lee waves, wave breaking, flow separation, and orographic drag). An important first step towards improved understanding of these features in the atmosphere is their accurate simulation at model (laboratory) scales. The proposed extension of a set of simulation tools developed under a previous NSF grant contains the elements necessary for accurate simulation of model-scale atmospheric flows. The research strategy is to: develop the numerical tools, validate and test the toolds, and investigate turbulent flow over several arrangements of terrain. Simulation of laboratory-sized geophysical flows over complex terrain would contribute to field-scale atmospheric simulations in two ways: through the improvement of approximate boundary conditions and parameterizations for mesoscale simulations, and through direct insight into the flow physics.