Under-expanded jets impinging on an adiabatic and a heated wall have been numerically studied by wall-resolved compressible Large Eddy Simulation (LES). The jets are characterised with an infinite lip and a Reynolds number of 6 × 10 4 based on an ideally-expanded jet velocity and a nozzle diameter D. The distance between the nozzle and the plate is 5D. A nozzle pressure ratio (NPR) of 3.4 is considered to investigate how the compressibility effect and shock waves affect the thermal behaviours close to the wall. A barycentric map is then utilised to further investigate the near-wall turbulence. It is found that the anisotropic turbulence exhibits one-directional fluctuations at the location where a secondary minimum of Nusselt number occurs. It is proposed that this behaviour could be explained by the generation of shocklets in the wall jet, leading to the reduced heat removal capability.
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