新月形沙丘表面流场的数值模拟  

Numerical modeling of flow over an isolated barchan dune

作　　者：江丽娟[1] 马高生[1] 

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2010年第1期48-52,58,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点基础研究发展计划(973计划)项目(2009CB421304);国家自然科学基金项目(10532040)

摘　　要：利用商用CFD流体计算软件FLUENT,对新月形沙丘流场进行数值模拟,得到沙丘表面气流结构;分析了迎风坡气流加速、背风坡回流区长度与沙丘高度、来流风速之间的关系。结果表明:沙丘高度是影响迎风坡气流加速的主要因素,沙丘高度越高,迎风坡气流加速越大,而来流风速对迎风坡气流加速的影响与沙丘高度比较,是小量可以忽略不计;回流区长度与沙丘高度的比值随着高度的增加而增加。A commercial software CFD from FLUENT Inc. was used to simulate the flow over an isolated barchan dune. The airflow structure of the dune surface was obtained and the relationships between flow acceleration up the stoss slope, separation length and dune height, upwind velocity analysed. The result indicates that dune height is the main factor that affects the flow acceleration： the higher the dune, the greater the flow acceleration up the stoss slope; and upwind speed also affects flow acceleration, but compared with dune height, the increment caused by the increases of upwind speed is small; finally, separation length grows with increasing dune height.

关 键 词：数值模拟 剖面曲线 沙丘风场 回流涡 剪应力 

分 类 号：O359[理学—流体力学] X169[理学—力学]