湍流大尺度结构及其对风沙跃移影响的大涡模拟

来源 :2016年全国环境力学学术研讨会 | 被引量 : 0次 | 上传用户:cjbin1688
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  风沙流是发生在大气近地层的气固两相流,起沙量、输沙通量一直是风沙运动研究的重点,是控制风沙灾害和沙尘预报的关键参数。在现有风沙流模型和风洞实验中,主要考虑平均风速对沙粒(尘)的作用,无法解释野外观测到的输沙现象,如:风速小于理论临界起动风速时仍存在输沙,野外输沙具有间歇性,实际风沙流以"条带"结构组织,输沙通量时空变化明显等。
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