European Turbulence Conference 2015

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12:00
15 mins

Direct numerical simulation of heat transfer of round subsonic impinging jets at high Reynolds number
Robert Wilke, Joern Sesterhenn

Session: Jets and Wakes 1
Session starts: Tuesday 25 August, 10:30
Presentation starts: 12:00
Room: Room E

Robert Wilke (Institute of Fluid Dynamics and Technical Acoustics, Berlin Institute of Technology, Germany)
Joern Sesterhenn (Institute of Fluid Dynamics and Technical Acoustics, Berlin Institute of Technology, Germany)

Abstract:
Impinging jets provide an effective cooling method for various applications such as the cooling of aircraft turbine blades. The latest generation of high performance computers allows us to investigate those at practically relevant Reynolds numbers Re by means of direct numerical simulations. In order to analyse the heat transfer of a confined round impinging jet, two direct numerical simulations are performed at Re=3300 and Re=8000 using a grid of 512 x 512 x 512 respectively 1024 x 1024 x 1024 points. Each configuration is fully turbulent. The first one features two annular regions with local maxima of heat transfer at the impinging plate. These effects are related to high wall-normal turbulent heat fluxes caused by vortical structures of the turbulent flow field. The second simultion is ongoing. Its results will also be presented on the conference.