A fine near-wall resolution plays a crucial role in simulations of unsteady heat transfer from a wall. A generation of fine structured grids for a complex domain is cumbersome and requires an enormous number of grid points and a local grid refinement is a possible technique for a grid point reduction. The present study addresses numerical simulations of impinging jet heat transfer on locally refined computational grids using the Scale-Resolving-Simulation methods (DES, LES and PANS). The study is performed at a Reynolds number Re = 23000 and two nozzle-plate distances H/D = 2 and H/D = 6. DES and the PANS model with f_k = 0.25 predicted results closest to experimental data. However, DES significantly over-predicted heat transfer at the location r/D = 1 − 2 in the small nozzle-plate distance case (H/D = 2). The decrease of physical resolution in the PANS model resulted in the over-prediction of heat transfer close to the nozzle axis. In conclusion, the influence of the local refinement in the perpendicular direction was rather low compared to the longitudinal direction. Moreover, the local grid refinement improved results predicted by LES and DES in the small nozzle-plate distance case.

精细的近壁分辨率在模拟来自壁的非稳态热传递中起着至关重要的作用。为复杂域生成精细结构网格很麻烦，需要大量网格点，局部网格细化是减少网格点的一种可能技术。本研究使用尺度解析模拟方法（DES、LES 和 PANS）解决了局部精细计算网格上冲击射流传热的数值模拟。该研究在雷诺数 Re = 23000 和两个喷嘴板距离 H/D = 2 和 H/D = 6 下进行。DES 和 PANS 模型的f _k  = 0.25 预测结果最接近实验数据。然而，DES 显着高估了位置r / D的热传递 = 1 - 2 在小喷嘴板距离情况下（H / D  = 2）。PANS 模型中物理分辨率的降低导致对靠近喷嘴轴的传热的过度预测。总之，与纵向相比，垂直方向的局部细化的影响相当低。此外，局部网格细化改进了 LES 和 DES 在小喷嘴板距离情况下预测的结果。