LES of incompressible heat and fluid flows past a square cylinder at high Reynolds numbers
LES of incompressible heat and fluid flows past a square cylinder at high Reynolds numbers
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不可压缩热和流体的 LES 以高雷诺数流过方形圆柱体
DOI：
10.1080/10618562.2015.1058373
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发表时间：
2015-03
影响因子：
1.3
通讯作者：
Zhu Zuojin
中科院分区：
文献类型：
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作者：
Li Yinglin;C.K. Chan;Mei Bowen;Zhu Zuojin
本文给出了大雷诺数(Re)为1.25×105~3.5×105的零入射角下绕方形圆柱(SC)流动的大涡模拟(LES)结果。在基于旋流强度的子网格模型的基础上，得到了大涡模拟结果，并在泰勒展开的基础上发展了一种高阶迎风格式。结果表明，对于雷诺数为{Re5=Re/10~5∈[1.2 5，3.5]}的零入射SC尾迹流，斯特劳哈尔数为0.1079，与雷诺数完全无关，阻力系数约为1.835，不确定度约为1.9%，对雷诺数几乎不敏感。当Re大于3.0×105时，亚格子粘性的时间平均峰值超过340，表明在涡旋运动活跃、涡旋相互作用强烈的地区，亚格子模式的作用是至关重要的。给出了时间跨度(t-z)平均的亚格子粘性比廓线，以及SC下游四个位置的亚格子粘性比和速度分量的起伏廓线。文中还报道和讨论了t-z平均亚格子粘性比的场，以及流向涡旋和展向涡旋的瞬时场。预测的平均Nusselt数与经验关联式进行了比较，表明基于旋流强度的LES在预测自然和工业流动方面具有潜力。
This paper presents large eddy simulation (LES) results of incompressible heat and fluid flows around a square cylinder (SC).at zero incident angle at high Reynolds numbers (Re) in the range from 1.25×105 to 3.5×105. LES results are obtained.on the basis of swirling strength based sub-grid model, and a higher order upwind scheme developed with respect to the.Taylor expansion. It was found that, for the zero incident SC wake flows at a Reynolds number in the range {Re5 = Re/105 ∈ [1.25, 3.5]}, the Strouhal number equals to 0.1079, completely independent of the Reynolds number; the coefficient of.drag is around 1.835 with an uncertainty of about 1.9%, almost non-sensitive to the Re. When Re is beyond 3.0×105, the.time-averaged peak value of sub-grid viscosity is over 340, implying that the role of sub-grid model is crucial in some regions.where vortex motion is active and vortex interaction is intense. The time–spanwise (t-z) averaged sub-grid viscosity ratio.profiles and the profiles of fluctuations of the sub-grid viscosity ratio and velocity components at four locations downstream.of the SC are presented. The fields of the t-z averaged sub-grid viscosity ratio, and the instantaneous fields of streamwise.and spanwise vorticities are also reported and discussed. The predicted mean Nusselt number is compared with empirical.correlations, revealing that swirling strength based LES has its potential in predicting natural and industrial flows.
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基于旋流强度的低雷诺数下单个方形圆柱体周围湍流的大涡模拟
DOI：
10.1007/s10483-014-1847-7
发表时间：
2014
期刊：
Applied Mathematics and Mechanics (English Edition)
影响因子：
--
作者：
Zhu Zuojin;Niu Jianlei;Li Yinglin
通讯作者：
Li Yinglin
影响因子：
2.8
作者：
M. Manhart
通讯作者：
M. Manhart
影响因子：
3.7
作者：
A. Roshko
通讯作者：
A. Roshko
影响因子：
3.7
作者：
OKAJIMA, A
通讯作者：
OKAJIMA, A
DOI：
10.1016/s0167-2789(99)00093-7
发表时间：
1999-03
期刊：
Physica D: Nonlinear Phenomena
影响因子：
--
作者：
Darryl D. Holm
通讯作者：
Darryl D. Holm