气体横掠单管强制对流换热的大涡模拟

应用大涡模拟与二价全展开ETC有限元离散格式相结合的方法对气体横掠单管强制对流换热进行了数值模拟，分别计算了气体横掠团管和方管时的温度场，得到了管壁平均换热系数，数值结果与实验关联式符合较好。同时还表明大涡模拟方法善于捕捉温度场以及流场涡系的时间演化过程，非常适合于具有大尺度涡的绕流运动温度场的分析。

Large Eddy Simulation of Forced Convection Heat Exchange by Gases Sweeping Across a Single Tube

By using a method of large eddy simulation combined with a second order full developed ETG finite element discrete scheme a numerical simulation was performed of the forced convection heat exchange by gases sweeping across a single tube. The temperature fields in the case of a circular tube and a square tube being swept by gases were calculated separately. As a result, an average heat exchange factor for tube walls was obtained. Numerical results agree relatively well with those of experimental correlation. Meanwhile, this also shows that the large eddy simulation method is especially effective in capturing temperature fields and the time evolution process of flow field eddy series and very suitable for the analysis of temperature fields involving the flow movement of large eddies.