二维槽道湍流数值模拟与自组织特性  

Direct simulation and self-organization of two-dimensional turbulent channel flow

作　　者：郭双喜[1,2] 李万平[2] 

机构地区：[1]美的制冷家电集团技术研发中心,佛山528311 [2]华中科技大学,武汉430074

出　　处：《应用力学学报》2010年第3期438-443,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(10372033);兰州大学西部灾害与环境力学教育部重点实验室开放基金

摘　　要：从流体力学基本方程出发,讨论了二维槽道湍流的衰减特性,通过对流场施加合适的体积力,采用拟谱方法对二维槽道强制湍流进行了数值模拟。研究了二维槽道衰减湍流的自组织与逆能量级串特性,再现了二维槽道衰减湍流中湍涡的自组织过程,以及不同波数湍流结构所携能量在自组织过程中的变化,并解释了二维槽道湍流平均速度曲线特征以及海洋环流所特有的自然现象。The decay characteristic of two-dimensional turbulence is discussed in the present paper. The two-dimensional turbulent channel flow is forced with proper external volume force and simulated directly with the pseudo-spectral method. The statistical results are in good agreement with the former researchers’ achievements. The self-organization and inverse energy cascade of two-dimensional decaying turbulent channel flow are further studied. The mergence processes of turbulent vortices are reappeared and the energy changes of different wave number turbulent structures are quantitatively obtained. The characteristics of velocity curve of two-dimensional turbulent channel flow and ocean circulation are explained via the mechanism of self-organization and inverse energy cascade.

关 键 词：二维槽道湍流 自组织特性 数值模拟 

分 类 号：O357.5[理学—流体力学]