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Direct Numerical Simulation of Stagnation Point Heat Transfer Affected by Varying Wake-Induced Turbulence

Direct Numerical Simulation of Stagnation Point Heat Transfer Affected by Varying Wake-Induced Turbulence
Autor:

Venema, L.
Von Terzi, Dominic
Bauer, H.-J.
Rodi,Wolfgang

Quelle:

Journal of Turbomachinery
Vol. 136, February 2014
Paper 021008
doi: 10.1115/1.4023907

Abstract

In the present study the flow and heat transfer in a tandem cylinder setup are simulated by means of embedded Direct Numerical Simulation (DNS). The influence of wake turbulence on the heat transfer in the stagnation region of the rear cylinder is investigated. The oncoming flow is varied by increasing the distance between the two cylinders, causing a change of the turbulent wake characteristics and the heat transfer. The data of both simulations show good agreement with an existing experimental correlation in the literature. For the small wake generator distance, a clear shift of the maximum heat transfer away from the stagnation line is observed. This shift is less pronounced for the larger distance.