典型文献
Secondary flows in statistically unstable turbulent boundary layers with spanwise heterogeneous roughness
文献摘要：
Large-scale secondary motions are known to occur in turbulent flows over surfaces with spanwise rough- ness heterogeneity. Numerical studies often use adjacent high- and low-roughness longitudinal strips to investigate these secondary rolls in boundary layers without any thermal stratification. In the present study, the effect of unstable thermal stratification on secondary rolls in a very high-Reynolds-number turbulent flow with spanwise-heterogeneous roughness is investigated by means of large-eddy simula- tion. The strength of the unstable stratification is systematically changed from L/h = ? 20 to L/h = ? 1 , where L and h are Monin-Obukhov length and boundary-layer height, respectively. This range covers the transition from neutral stratification to unstable stratification. The results show that the positive buoy- ancy associated with the unstable thermal stratification acts against the roughness-induced secondary rolls. In the case of unstable stratification, secondary rolls are completely canceled out by buoyancy and replaced by new stronger convection-induced rolls rotating in opposite directions.
文献关键词：
中图分类号：
作者姓名：
Ali Amarloo;Pourya Forooghi;Mahdi Abkar
作者机构：
Department of Mechanical and Production Engineering,Aarhus University,Aarhus C,8000,Denmark
文献出处：
引用格式：
[1]Ali Amarloo;Pourya Forooghi;Mahdi Abkar-.Secondary flows in statistically unstable turbulent boundary layers with spanwise heterogeneous roughness)[J].力学快报（英文）,2022(02):65-71
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B类：
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AB值：
0.522481
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