中文摘要：

基于Chimera网格采用有限体积法模拟串联双圆柱在亚临界区的共轭传热,采用二维瞬态N-S方程,结合RNG k-ε湍流模型和压力Poisson方程方法,分析亚临界区（Re=6×104）不同固体与流体热容比以及导热系数比下,圆柱表面努赛尔数和圆柱内无量纲温度的变化规律.结果表明,圆柱内温度稳定后最高温度随着导热系数比的提高减小并逐渐趋于平缓,但体积热容比对于稳定后的温度场影响并不明显;另外圆柱内部最高温度位置随导热系数比提高而向后圆柱后部移动;下游圆柱的表面温度以及柱内最高温度均高于上游圆柱,而上游圆柱努赛尔数要高于下游圆柱.

英文摘要：

Overset-grid based finite volume formulation has been applied to numerically simulate flow and conjugate heat transfer around and inside two tandem circular cylinders. Two-dimensional unsteady Reynolds-averaged Navier-Stokes equations were solved under moderate Reynolds number （6×10 4）, using RNG k-ε turbulent model for Reynolds stress term closure. The incompressible velocity field was coupled with its pressure field by solving pressure Poisson equation. Transient temperature profile around and inside the cylinders, Nusselt number on surface of the cylinders were analyzed thoroughly. The result shows that when the temperature field has become stable, the maximum temperature decreases with the increasing thermal conductivity ratio and the curve gradually levels off; however the increase of volume heat capacity ratio does not make an apparently different developed temperature field. It was found that the positions of the maximum temperature moved from the centers to their rear parts of the two cylinders when thermal conductivity ratio increases. Mean temperature and the maximum temperature of the downstream cylinder are higher than that of the upstream cylinder, while the Nusselt number of the latter is higher than that of the former.