本文選題：風(fēng)吹雪　切入點(diǎn)：特征繞流　出處：《西南交通大學(xué)學(xué)報(bào)》2016年06期 　論文類型：期刊論文

【摘要】：為考察偏斜風(fēng)效應(yīng)下地面結(jié)構(gòu)周邊地表積雪形態(tài)及形成機(jī)理,基于歐拉框架多相流理論,采用計(jì)算流體動(dòng)力學(xué)(CFD)方法,模擬了不同來(lái)流風(fēng)向下立方體建筑的特征繞流場(chǎng),對(duì)比了地表侵蝕積雪預(yù)測(cè)指標(biāo)的差異.研究結(jié)果表明:來(lái)流風(fēng)向的改變影響模型周邊近地流分離及附著的形成,決定了地表剪切狀態(tài),順風(fēng)體軸方向,風(fēng)向角β的增大(0°≤β≤45°)使侵蝕極值位置總體后移,模型背風(fēng)側(cè)極值位置隨風(fēng)向的改變較迎風(fēng)側(cè)敏感;空間吹雪濃度分布受模型特征擾流及風(fēng)向重分配效應(yīng)影響顯著,決定了當(dāng)?shù)爻练e強(qiáng)度,橫風(fēng)體軸方向,靠近來(lái)流側(cè)近地吹雪濃度始終大于出流側(cè),兩側(cè)濃度差隨風(fēng)向角β的增大(0°≤β≤45°)而增大.單位時(shí)間下地物水平正交方向的侵蝕沉積量隨風(fēng)向的改變呈現(xiàn)此消彼長(zhǎng)的規(guī)律,風(fēng)向?qū)植康乇矸e雪形態(tài)的調(diào)整機(jī)制近似動(dòng)態(tài)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 擄鈮，

本文編號(hào)：1566846