摘要
通过拟周期边界条件、布置粗糙元和添加随机扰动等措施实现了大气边界层风场的LES模拟。对可能影响数值模拟结果的网格密度、粗糙元高度、随机数大小、随机数赋值方向及范围等主要参数进行分析,确定其影响规律,并据此生成满足目标要求的四类不同地貌大气边界层风场。结果表明,本文的模拟结果满足结构抗风计算的要求,验证了本文所采用的数值模拟方法的可行性,为后续进行结构绕流的大涡模拟提供了有价值的来流生成方法。
A method combining with the pseudo-periodic boundary condition, the roughness elements and random disturbance for large eddy simulation of atmospheric boundary layer flow is described in the paper. The possible parameters influencing the simulation results such as the grid density, the extraction position, the roughness element height and＇ the random number assignment are analyzed. Atmospheric boundary layer flows in four types of terrains are produced through modifying the above influencing parameters. The results got in the paper agree well with desired characteristics and can be adopted as the inflow conditions for the large eddy simulation of flow around buildings.
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2012年第5期734-739,746,共7页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金重大研究计划重点(90815021)
国家自然科学基金杰出青年基金(50725826)资助项目
关键词
结构工程
结构抗风
大涡模拟
大气边界层风场
拟周期边界条件
structure engineering
wind resistant
large eddy simulation
atmospheric boundary layer flow
pseudo-periodic boundary condition
