偏斜风对地物周边空间吹雪及积雪形成的影响

发布时间：2018-03-04 18:39

  本文选题：风吹雪　切入点：特征绕流　出处：《西南交通大学学报》2016年06期 　论文类型：期刊论文

【摘要】：为考察偏斜风效应下地面结构周边地表积雪形态及形成机理,基于欧拉框架多相流理论,采用计算流体动力学(CFD)方法,模拟了不同来流风向下立方体建筑的特征绕流场,对比了地表侵蚀积雪预测指标的差异.研究结果表明:来流风向的改变影响模型周边近地流分离及附着的形成,决定了地表剪切状态,顺风体轴方向,风向角β的增大(0°≤β≤45°)使侵蚀极值位置总体后移,模型背风侧极值位置随风向的改变较迎风侧敏感;空间吹雪浓度分布受模型特征扰流及风向重分配效应影响显著,决定了当地沉积强度,横风体轴方向,靠近来流侧近地吹雪浓度始终大于出流侧,两侧浓度差随风向角β的增大(0°≤β≤45°)而增大.单位时间下地物水平正交方向的侵蚀沉积量随风向的改变呈现此消彼长的规律,风向对局部地表积雪形态的调整机制近似动态平衡.
[Abstract]:In order to investigate the formation mechanism of snow cover around the ground structure under the oblique wind effect, based on the theory of Euler frame multiphase flow, the characteristic flow field around the cube building with different incoming wind is simulated by using the computational fluid dynamics (CFD) method. The difference of prediction indexes of snow cover for surface erosion is compared. The results show that the change of incoming wind direction influences the formation of near-ground flow separation and adhesion around the model, which determines the shear state of the surface and the axis direction of the downwind body. The increase of wind direction angle 尾 (0 掳鈮，

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