Abstract
We present a DNS of a compressible impinging jet flow with Reynolds and Mach numbers of 8134 and 0.71, respectively. The jet is vertically confined between two isothermal walls and issues from a circular orifice of diameter D in the uppermost wall. The lowermost wall, placed at a distance of 5D from the other, serves as impingement plate. The temperature of the walls is constant and \({85\,\text {K}}\) higher than the average total temperature of the jet at inlet. In order to resemble engineering configurations where the inflow will certainly not be laminar, we prescribe fully turbulent inlet conditions. To this end, the impinging jet simulation is coupled with an auxiliary fully developed turbulent pipe flow DNS. This approach circumvents the calibration issues that arise when a synthetic turbulence generator is used. Because of their relevance in cooling applications, the analysis focuses on the heat transfer at the impingement wall and its spatial distribution, whose peculiar shape is determined by the vortex dynamics in the proximity of the wall. Aiming at identifying the effects of the turbulent inflow, results are compared with those of previous computations performed with comparable configuration but laminar inflow.
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Notes
- 1.
A positive Nusselt number indicates heat being transferred from the plate to the fluid.
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Acknowledgements
All simulations were performed on the Cray XC40 (Hazelhen) supercomputer at the High Performance Computing Center Stuttgart (HLRS) under the grant number JetCool/44127. The authors gratefully acknowledge support by the Deutsche Forschungsgemeinschaft (DFG) as part of collaborative research center SFB 1029 “Substantial efficiency increase in gas turbines through direct use of coupled unsteady combustion and flow dynamics” on project B04.
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Camerlengo, G., Sesterhenn, J. (2021). DNS Study of the Turbulent Inflow Effects on the Fluid Dynamics and Heat Transfer of a Compressible Impinging Jet Flow. In: Nagel, W.E., Kröner, D.H., Resch, M.M. (eds) High Performance Computing in Science and Engineering '19. Springer, Cham. https://doi.org/10.1007/978-3-030-66792-4_28
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