一种剪切修正的涡黏性亚格子模型及其在槽道湍流中的应用
Shear-modified sub-grid model and its applications to turbulent channel flow
-
摘要: 提出了一种利用壁面附近强剪切对涡黏系数进行修正的亚格子模型,称为剪切修正的涡黏模型.该模型能使涡黏系数在壁面附近自动满足壁面修正,在脉动为零的地方,涡黏系数自动为零,保证了壁面附近涡黏系数趋于零的特性.用该模型对槽道湍流壁面无吹吸、有吹吸,较低和较高雷诺数的情况进行了数值模拟,与直接数值模拟的结果进行了对比,结果吻合较好.Abstract: This paper presented a sub-grid model called shear-modified eddy viscosity model,which modifies eddy viscosity coefficient with use of strong shear near the wall.This model can make eddy viscosity coefficient satisfy the wall modification automatically.Thus,the eddy viscosity approaches to zero in the proximity of the wall in the case of zero eddy viscosity coefficient in the place without fluctuation.Numerical simulation was performed in the situation of blow-suction,no blow-suction,low Reynolds number and high Reynolds number.The result is consistent with the direct numerical simulation(DNS) by comparison.
-
Key words:
- turbulent channel flow /
- large eddy simulation /
- sub-grid model /
- shear /
- blow-suction
-
点击查看大图
计量
- 文章访问数: 1526
- HTML浏览量: 12
- PDF量: 482
- 被引次数: 0
下载: