沙纹分布的流体力学模拟  

Hydrodynamics simulation of distribution of sand-ripples.

作　　者：丁国栋[1] 王贤[1] 王俊中[2] 

机构地区：[1]北京林业大学资源与环境学院 [2]国家林业局防治荒漠化管理中心

出　　处：《北京林业大学学报》2001年第6期13-16,共4页Journal of Beijing Forestry University

基　　金：国家自然科学基金资助项目 ( 30 0 70 6 0 0 )

摘　　要：在考察、分析沙纹基本特性的基础上 ,从流体力学的绕流理论出发 ,以两种常见的简单绕流流动为例 ,即平表面等速直线流动和绕流圆柱体形障碍物的流动 ,对沙纹的分布问题进行力学模拟 ,其模拟结果与实际情况十分吻合 .对于其它类型的简单绕流流动也可以通过同样方法进行模拟 ;对于实际中存在的较为复杂的绕流流动 ,可以通过流动迭加理论予以模拟 .从而得出结论 :沙纹表征的是气流流动的能量特征曲线 ,理想不可压缩气流流动状态下 。Based on the observation and analyses of the basic characteristics of sand-ripples, combined with fluidrounded theory, the distribution of sand-ripples are simulated through case studies of two simple forms of fluidrounded movement, and the simulating results tally with substantial evidences. The formation processes of other simple fluid-rounded movements can be Simulated in the same way, and the movement-overlay theory can be applied in the simulation of more complex movement forms. A conclusion is deduced that the grain of sand-ripples reflects the trait curve of airflow. The distribution of sand-ripples formed by incompressible ideal air fluid can be attained through confirming the velocity potential of the air fluid field.

关 键 词：沙纹 流体力学 模拟 

分 类 号：P931.3[天文地球—自然地理学]