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首页> 外文期刊>Annalen der Meteorologie >AN INVESTIGATION INTO RIDGE-TOP TURBULENCE CHARACTERISTICS: A CASE STUDY OF IN SITU MEASUREMENTS AND LARGE EDDY SIMULATION
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AN INVESTIGATION INTO RIDGE-TOP TURBULENCE CHARACTERISTICS: A CASE STUDY OF IN SITU MEASUREMENTS AND LARGE EDDY SIMULATION

机译：脊顶湍流特性的调查：原位测量和大涡模拟的案例研究

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摘要

High Reynolds number turbulent flow over a ridge top in New Zealand is investigated through in situ measurements and large eddy simulations. Spectral analysis was performed for observed stream-wise and lateral velocity components for two different locations along the ridge. Multi-scale turbulent interactions are examined and the 3-dimensional isotropy assumption in the inertial sub-range of the spectrum assessed. Turbulent eddy length scales were derived showing increased dissipative length scales during day time. The Advanced Regional Prediction System (ARPS) large eddy simulation (LES) model was used in 2-D simulations over the experimental site to examine the sensitivity of surface layer turbulence to soil moisture initialization. Results for the dry soil runs showed a relative increase in daily averaged turbulent kinetic energy by 25 % and 23 % for two different locations in the domain. The nature of turbulent eddy evolution, structure and interaction over a complex ridge is examined.
机译：通过现场测量和大型涡流模拟研究了新西兰脊顶高雷诺数湍流。对沿山脊两个不同位置观察到的水流和侧向速度分量进行了频谱分析。检查了多尺度湍流相互作用，并评估了光谱惯性子范围内的3维各向同性假设。得出湍流的涡流长度量表，表明白天的耗散长度量表增加。在实验地点的二维模拟中使用了先进区域预测系统（ARPS）大涡模拟（LES）模型，以检查表层湍流对土壤水分初始化的敏感性。干燥土壤运行的结果表明，在该域中的两个不同位置，平均湍流动能的每日平均相对增加了25％和23％。研究了湍流涡在复杂脊上的演化，结构和相互作用的性质。

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