Compressible flow past a heated circular cylinder at subcritical Reynolds number of 3900 is numerically investigated by using the large-eddy simulation method. Rigorous validations of the numerical model are carefully performed under isothermal conditions on the basis of available experimental data. The calculated mean flow and Reynolds stresses show good agreement with the published experimental data. The effects of temperature difference between the cylinder surface and the freestream on the flow statistics and thermal characteristics are further studied in detail by setting two kinds of wall temperature boundary conditions. It is manifested that increasing the wall temperature leads to the augmentation of skin friction drag, suppression of turbulent intensity, enhancement of flow mixing and extension of recirculation zone. In addition, it is found that the variations of thermo-physical properties pose a slight effect on the wall heat flux before the boundary layer separates from the cylinder surface. It is worth noting that the recirculation bubble length can be used as a distance scaling parameter to weaken the temperature dependence of the flow and thermal statistics. These results provide a more detailed insight into the statistical difference in the wake region of cylinder when the temperature effect is taken into account.

采用大涡模拟方法，对通过亚临界雷诺数为3900的加热圆柱体的可压缩流动进行了数值研究。根据现有的实验数据，在等温条件下对数值模型进行了严格的验证。计算出的平均流量和雷诺应力与公布的实验数据非常吻合。通过设置两种壁温边界条件，进一步详细研究了圆柱体表面与自由流之间的温差对流动统计和热特性的影响。结果表明，增加壁温会导致表面摩擦阻力增加，湍流强度降低，流动混合增强，再循环区扩大。此外，研究发现，在边界层与圆柱体表面分离之前，热物理性质的变化对壁面热通量的影响很小。值得注意的是，再循环气泡长度可以作为距离缩放参数来削弱流动和热统计的温度依赖性。当考虑温度效应时，这些结果提供了对气缸尾流区域统计差异的更详细的洞察。