| 大涡模拟中亚格子模型的改进及其在槽道湍流中的应用 |
| |
| 引用本文： | 肖红林,罗纪生.大涡模拟中亚格子模型的改进及其在槽道湍流中的应用[J].航空动力学报,2007,22(4):583-587. |
| |
| 作者姓名： | 肖红林 罗纪生 |
| |
| 作者单位： | 天津大学,力学系,天津,300072 |
| |
| 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.
|
| 关 键 词： | 航空、航天推进系统 槽道湍流 大涡模拟 亚格子雷诺应力 涡粘系数 壁面函数 |
| 文章编号： | 1000-8055(2007)04-0583-05 |
| 收稿时间： | 2006/4/25 0:00:00 |
| 修稿时间： | 2006年4月25日 |
Improvement of sub-grid model in large eddy simulation and applications in turbulent channel flow |
| |
| XIAO Hong-lin and LUO Ji-sheng.Improvement of sub-grid model in large eddy simulation and applications in turbulent channel flow[J].Journal of Aerospace Power,2007,22(4):583-587. |
| |
| Authors: | XIAO Hong-lin and LUO Ji-sheng |
| |
| Institution: | The Department of Mechanics, Tianjin University, Tianjin 300072, China;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. |
| |
| Keywords: | aerospace propulsion system turbulent channel flow large eddy simulation sub-grid Reynolds stress eddy viscosity wall function |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《航空动力学报》浏览原始摘要信息 |
| 点击此处可从《航空动力学报》下载免费的PDF全文 |
|
