Large Eddy and Flight Simulations of a Clear Air Turbulence Event Over Tokyo on 16 December 2014
Large Eddy and Flight Simulations of a Clear Air Turbulence Event Over Tokyo on 16 December 2014
复制标题
2014 年 12 月 16 日东京上空晴空湍流事件的大涡流和飞行模拟
DOI：
10.1175/jamc-d-21-0071.1
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发表时间：
2022
影响因子：
3
通讯作者：
and S. Obayashi
中科院分区：
文献类型：
--
作者：
R. Yoshimura;K. Suzuki;J;Ito;R. Kikuchi;A. Yakeno;and S. Obayashi
在这项研究中，利用天气研究和预报(WRF)模式中的高分辨率(250 M)大涡模拟再现了一次晴空湍流事件，并将所产生的风场用于飞行模拟以估计飞机经历的垂直加速度变化。模拟了2014年12月16日的情况，当时东京地区报告了与温带气旋有关的许多强烈湍流遭遇(和一起事故)。根据观测和WRF模拟，该湍流是由射流轴线附近的剪切层不稳定引起的。模拟结果证实了不稳定的存在，导致水平涡的垂直速度从+20到−12m S−1，最大涡耗散率估计在0.7以上，这表明该模型再现了可能导致大型飞机强烈晃动的湍流条件。基于飞机运动方程的飞行模拟器估计波音777级飞机的垂直加速度变化为+1.57到+0.08G。尽管模拟的垂直加速度变化幅度小于事故中报告的幅度(+1.8G到−0.88G)，但该模型结合了大气和飞行模拟，成功地再现了飞机的运动。
In this study, a clear-air turbulence event was reproduced using a high-resolution (250 m) large-eddy simulation in the Weather Research and Forecasting (WRF) Model, and the resulting wind field was used in a flight simulation to estimate the vertical acceleration changes experienced by an aircraft. Conditions were simulated for 16 December 2014 when many intense turbulence encounters (and one accident) associated with an extratropical cyclone were reported over the Tokyo area. Based on observations and the WRF simulation, the turbulence was attributed to shear-layer instability near the jet stream axis. Simulation results confirmed the existence of the instability, which led to horizontal vortices with an amplitude of vertical velocity from +20 to −12 m s−1. The maximum eddy dissipation rate was estimated to be over 0.7, which suggested that the model reproduced turbulence conditions likely to cause strong shaking in large-size aircraft. A flight simulator based on aircraft equations of motion estimated vertical acceleration changes of +1.57 to +0.08 G on a Boeing 777-class aircraft. Although the simulated amplitudes of the vertical acceleration changes were smaller than those reported in the accident (+1.8 to −0.88 G), the model successfully reproduced aircraft motion using a combination of atmospheric and flight simulations.