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IMPACT OF TURBULENCE AND RADIATION MODELS ON COMPUTATIONAL HEAT TRANSFER PREDICTION

DOI: 10.1615/ICHMT.2008.CHT.1750
18 pages

Daniele Suzzi
The Virtual Vehicle Competence Center (ViF), Graz, Austria

Christian Rauch
Christian Rauch Research e.U.

Sebastian Jagsch
MAGNA STEYR Fahrzeugtechnik AG & Co. KG, Graz, Austria

Raimund A. Almbauer
Graz University of Technology, Institute for Internal Combustion Engines and Thermodynamics, Graz, Austria

Abstract

The prediction of local surface temperatures is gaining a key role in the development of passengers and heavy duty vehicles. Computational methods could provide many advantages in the prototyping development and the geometry optimization phases. Nevertheless, physical and numerical reliable CFD solutions are strongly related to time costs, which represent a critical point in the product development cycle.
The aim of this paper is to analyze the interaction of different computational parameters on the prediction of heat transfer phenomena. In the environment of a commercial CFD code mesh resolution, wall functions, turbulence, and radiation models are being considered with respect to industrial requirements.
At first, the influence of boundary layer thickness and turbulence models is taken into account. The chosen test case is represented by an impinging jet on a flat surface. The simultaneous effects of free and wall jet, stagnation point, boundary layer, and transition represent a comprehensive environment for the testing of convective heat flux.
The combined effects of convection and radiation are then investigated. A low speed wind tunnel containing a heated tube representative of an exhaust is selected as benchmark. Experimental data on the test rig heat shield temperature are compared to simulation results according to a variation of computational parameters.

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