圆截面U形管流有限元模拟

Finite element method simulation of a duct flow

弯曲圆管内流动具有很强的工业应用背景,管内二次涡的大小、位置及发生的频率会对流动系统的阻力及热质交换产生重大作用,研究弯曲圆管内的流动具有重要的理论意义。本文应用湍流大涡模拟方法对弯道流动进行了数值模拟。用时间推进法,给出了隐含流线迎风耗散作用的二阶完全展开Taylor-Galerkin有限元离散格式,数值计算的结果与实验结果符合较好。表明大涡模拟方法适用于边界形状复杂,存在各向异性的大尺度涡的流动仿真。

Presents the results of numerical simulation for a curved duct flow by means of large eddy simulation （LES）. The finite element method Taylor-Galerkin scheme is used in the simulation. The results of calculation coincide with Taylor＇s experiments reasonably. It demonstrates that LES technique is especially available for flow situations with complicated geometrical boundary system in which always exist anisotropic large vortexes.