大涡模拟中亚格子模型的改进及其在槽道湍流中的应用

基金项目: 国家自然科学基金重点项目(10232020)

Improvement of sub-grid model in large eddy simulation and applications in turbulent channel flow

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.
- 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
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.
- aerospace propulsion system /
- turbulent channel flow /
- large eddy simulation /
- sub-grid Reynolds stress /
- eddy viscosity /
- wall function

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