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The authors discuss a new numerical simulation method of the downburst wind loads on the basis of the previous research. Firstly, the wind speed is expressed as the sum of an instantaneous mean wind speed and an amplitude-modulating non-stationary fluctuating wind speed. Secondly, a new method based on the modified Osegguera and Bowles/Vicroy model to simulate the mean wind is presented and the fluctuating wind is simulated by a modified spectral representation method.

在將下擊暴流風速表達為時變的平均風速和調制的非平穩(wěn)脈動風速之和的前提下，本文采用基于改進的OBV模型Oseguera and Bowles/Vi-croy(OBV的方法來模擬平均風速囯产免费看黄色视频，其平均風速直接由改進的OBV模型表達在线黄网站，而不同于已往研究中將平均風速表達為豎向風剖面與時間函數的乘積国产aaaaaaa，并采用結合快速傅里葉變化的諧波疊加法來模擬調制的非平穩(wěn)脈動風速黄色视频免费看不用下载。

A wind tunnel for thunderstorm downburst was well designed by taking into account the low-speed uniflow wind tunnel design criteria, andan adjustable plate was made to simulate the ground.

鑒于雷暴沖擊風試驗裝置的特殊性以及與低速直流風洞的共通性看国产到91，參考低速直流風洞的設計方法設計完成了試驗裝置的洞體結構，并制作了具有調節(jié)功能的平板來模擬地面在线视频一区二区三区四区。

Thunderstorm downburst wind tunnel has the particularity and the intercommunity with a low-speed uniflow wind tunnel. A wind tunnel for thunderstorm downburst was well designed by taking into account the low-speed uniflow wind tunnel design criteria, andan adjustable plate was made to simulate the ground.

鑒于雷暴沖擊風試驗裝置的特殊性以及與低速直流風洞的共通性性欧美老妇另类XXxX厕所，參考低速直流風洞的設計方法設計完成了試驗裝置的洞體結構，并制作了具有調節(jié)功能的平板來模擬地面九九无码视频。

The unsteady numerical simulation is helpful to understand the dynamics of downburst wind.

非定常的數值模擬將有助于更好地理解下擊暴流風的動力特征26uuu26uuu。

The research confirmed that the wind field characteristics of downburst are quite different from boundary layer winds.

研究證實，下擊暴流風具有同常規(guī)的大氣邊界層近地風完全不同的風場特征真人抽搐一进一出gif免费404。

downburst：下爆流

down valley wind 下谷風 | downburst 下爆流 | downconvertor 下降轉換器

downburst：下擊暴流

"returning flow weather","回流天氣" | "downburst","下擊暴流" | "El Nino","厄爾尼諾"