学术
摘 要:
在用大涡模拟的方法计算具有强剪切的槽道湍流时，常用的亚格子应力模型，包括考虑壁面修正的模型，都会出现平均流剖面偏高的现象．这表明在壁面附近亚格子应力模型还不能描述实际情况．针对这一问题，修正了亚格子雷诺应力模型的壁面函数，得到了较好的计算结果．用修正后的模型计算出的平均速度分布、均方根速度的分布以及雷诺应力的分布，均与直接数值模拟（DNS）的结果吻合较好．[著者文摘]
文章出处:
《航空动力学报》-2007年22卷4期 -583-587页
栏目信息:
文献标识码:
A
文章编号:
1000-8055（2007）04-0583-05
Improvement of sub-grid model in large eddy simulation and applications in turbulent channel flow
XIAO Hong-lin, LUO Ji-sheng （The Department of Mechanics, Tianjin University, Tianjin 300072, China）
Abstract:
If large eddy simulation method is used to calculate the turbulent channel flow with strong shear, the commonly used sub-grid stress models, including wall modification model, will generate excessively high mean velocity profiles. It indicates that sub-grid stress model cannot describe the situation nearby the wall. To this end, the wall function of the sub-grid Reynolds stress model was modified to obtain a better result. The mean velocity profiles, the RMS（root-mean-square） velocity profiles and Reynolds stress profiles calculated by the modified model are consistent with the results of DNS.[著者文摘]
Key words:
aerospace propulsion system; turbulent channel flow; large eddy simulation; sub-grid Reynolds stress; eddy viscosity; wall function
基金资助:
国家自然科学基金重点项目（10232020）
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